hybridfree/eevblog-posts huggingface dataset:
Exar/Maxlinear KH600 1GHz 10V differential amplifier replacement? - Page 1
Forum section: electronics / rf-microwave

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: March 05, 2025, 05:33:57 am
content: I am having trouble finding a replacement (or a few old parts) for KH600 DC-coupled differential amplifier. A combination of high slew rate 13kV/usec, +/-5V supply and adjustable common mode voltage is hard to find. They were used in Agilent/Tabor 81180 AWG and are somewhat damaged on mine.

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: April 08, 2025, 05:59:41 pm
content: Bump... Here is the picture of the amplifier, in case anyone recalls seeing one in the wild.I found a few possible substitutions (LMH6552, ADA4927, THS3202), but all are inferior in some way.
Questions about AD6190ARS RF transceiver - Page 1
Forum section: electronics / rf-microwave

author: sdimen
author_rank: Newbie
timestamp: March 31, 2025, 02:06:03 am
content: Hello everyone,I am currently working on a wireless communication project and considering the design of theAD6190ARS(parameter information) RF transceiver. I have some issues with its application and performance:1\How does the AD6190AR compare to the latest RF transceivers in terms of sensitivity and power efficiency?2\Are there any specific design considerations or common pitfalls when implementing this chip in a PCB layout?Thanks for any insights or experiences you can share. Thanks in advance!

author: Kean
author_rank: Unknown
timestamp: March 31, 2025, 03:10:59 pm
content: Do you realise that is an obsolete part?https://www.analog.com/en/products/ad6190.html

author: ftg
author_rank: Frequent Contributor
timestamp: March 31, 2025, 03:21:43 pm
content: Shame that it's obsolete. A low cost transceiver with 10.7MHz TX and RX IF's would have been a fun toy.

author: Kean
author_rank: Unknown
timestamp: April 05, 2025, 09:08:14 am
content: Quote from: ftg on March 31, 2025, 03:21:43 pmThere is a decent number available on Rochester Electronics (over 20,000+ as of today) if you wanted to do prototyping or small scale manufacturing, but availability is not ideal for new product design.https://www.findchips.com/search/AD6190ARAnd while RocElec are good to deal with and seem to have good storage practices, who knows what date code their stock is and where they originally came from.

author: ftg
author_rank: Frequent Contributor
timestamp: April 07, 2025, 08:00:56 am
content: Rochester usually has rather high MOQ's and shipping costs for someone who wants maybe 10pcs for a hobby project.
Help with Azden PCS-4000 PLL circuit - Page 1
Forum section: electronics / rf-microwave

author: WB8PFZ
author_rank: Regular Contributor
timestamp: April 04, 2025, 07:02:24 pm
content: I know it is old and should be replaced with a new one. Any how the PLL is not working. All checks good but no signal out of IC401 TC9125BP. Can some one explain how to check the inputs to this IC? i have a new one but is a PITA to replace unless I know it is the issue. Thanks
Advice on L1 GNSS Antenna for Semi-Permanent Outdoor Enclosure - Page 1
Forum section: electronics / rf-microwave

author: davegravy
author_rank: Regular Contributor
timestamp: April 02, 2025, 09:30:06 pm
content: I'm looking for advice on choosing and integrating an L1 GNSS antenna for my system. The system will be housed in a small Pelican case with an aluminum panel that supports the GNSS receiver PCB and other electronics, like this:https://nanukcases.ca/products/panel-kits?srsltid=AfmBOorvRvV1mWPolpJ2BLE6te4NdSF-qZqTUnuwvOvP7ZbViWhQXErz&variant=38294686466229The antenna must be located inside the enclosure, either mounted to the plastic shell or the aluminum panel. The electronics will be positioned below the panel, while the antenna can be above it.Deployment ConditionsThe system will be semi-permanently deployed outdoors in an urban environment, typically sitting on a rooftop or mounted to construction fencing.When deployed, the case may be in one of two orientations: having its lid facing upward or positioned horizontally.An active antenna is possible, but power is limited. Only 1-2 locates per day are needed, and I can switch power to the antenna as required.Accuracy of <20m is sufficient, but I want to minimize time-to-fix (<30s) for battery life reasons.The primary goal is for personnel to locate the device for servicing/retrieval or detect if it's been relocated.QuestionsAre my requirements particularly challenging, and should I expect to spend significant time optimizing the antenna setup?What type of antenna should I use? Patch? module? other?Given the variable orientation of the enclosure, how important is omni-directionality?Would mounting the antenna to the aluminum panel be beneficial (larger ground plane = better gain) or problematic (multipath reflections, detuning)?For reference, I’m using a Ublox SARA-R520 module (integrated GNSS receiver) and have about 1" of clearance between the aluminum panel and the inside of the lid. 3.6" inches of clearance below the panel.Would appreciate any insights—thanks!

author: uer166
author_rank: Super Contributor
timestamp: April 02, 2025, 11:33:45 pm
content: Not particularly challenging if it's on a roof outside under plastic. I've had best luck with helical L1 antenna, it doesn't really require a ground plane to work, and has good rejection of ambient linearly polarized RF interference.The "acquisition" time depends not only on the antenna but also on luck: certain information is sent at larger intervals than 30s such as UTC time offset from GPS time.There's versions of both with LNA and without. If your receiver is very close to antenna, you don't need LNA.

author: uer166
author_rank: Super Contributor
timestamp: April 02, 2025, 11:35:27 pm
content: The 2 orientations at 90 degrees are mildly annoying: I would mount the helical at 45 degrees off of vertical then so that it points 45 degrees up from horizon in both orientations.A (mostly) directional antenna is still helpful here vs. full Omni like you'd have on a portable device like a smartwatch.
Propose some books about ldmos amplifier designs please. - Page 1
Forum section: electronics / rf-microwave

author: Fflint
author_rank: Frequent Contributor
timestamp: April 07, 2025, 02:35:11 pm
content: I'm looking for books on the subject of ldmos rf amplifiers. Not for beginners, but for an intermediate person who knows the concepts of rf. I've built few vacuum tube linear RF amifiers. I've built one kit ldmos amp and I fixed a couple too.There is a large selection of good books for building vacuum tube gear, but this doesn't seem to be the case for ldmos. I'm especially looking for answers to questions like how feedback affects input/output matching.

author: rf-fil
author_rank: Regular Contributor
timestamp: April 08, 2025, 04:29:41 am
content: RF Power Amplifiers for Wireless Communications, Steve C. Cripps

author: dobsonr741
author_rank: Frequent Contributor
timestamp: April 08, 2025, 04:46:53 am
content: 1. “Handbook of RF and Microwave Power Amplifiers” edited by John L. B. Walker: This comprehensive resource covers various aspects of RF and microwave power amplifier design, including devices like Si LDMOS and VDMOS, GaAs FETs, and GaN HEMTs. It provides in-depth discussions on amplifier classes, design methodologies, and includes sections pertinent to LDMOS technology. ￼2. “RF Power Amplifiers for Wireless Communications” by Steve C. Cripps: This book delves into the principles of RF power amplifiers, offering detailed analyses of feedback effects, impedance matching, and design strategies to optimize amplifier performance. It’s a valuable resource for understanding both theoretical and practical aspects of RF power amplifier design.3. “Practical RF Amplifier Design and Performance Optimization with SPICE and Load- and Source-Pull Techniques” by Amal Banerjee: This text explains and demonstrates, with an exhaustive set of design examples, how common types of RF amplifiers can be designed and optimized. It covers the use of SPICE for simulation and discusses load- and source-pull techniques, essential for understanding feedback and impedance matching in amplifier design.Regarding “The LDMOS R.F. Amplifier Handbook” by Helge Granberg, it appears that this specific title may be out of print or not widely available online. However, Helge Granberg has contributed significantly to the field, and his works are referenced in other publications. For instance, the book “Radio Frequency Transistors: Principles and Practical Applications” by Norman Dye and Helge Granberg provides valuable insights into RF transistor applications, including LDMOS devices. ￼I hope these resources assist you in your exploration of LDMOS RF amplifier design.
Rohde and Schwarz 3 Diodes Path Power Sensor Architechture  - Page 1
Forum section: electronics / rf-microwave

author: EE54
author_rank: Regular Contributor
timestamp: March 24, 2025, 05:07:20 pm
content: After watching The Signal Path review of the R&S line of power sensor, I have been wondering about how some aspect of the NRP40SN 3-Path Diode Power Sensor work. Specifically, how did the designer protect the lowest range detector diode from being destroyed. From the diagram, it just look like the lowest range diode is connected directed to the input via a power divider. If you were to put, say the max +23dBm would that not fry the diode?The only thing I can think of how this might work is to shunt the input to the lowest range detector into an internal 50R termination if the input power is too high.

author: Aiy
author_rank: Regular Contributor
timestamp: March 24, 2025, 07:24:40 pm
content: Hello there,I believe that diodes used in detectors like these can take about 100mW, see for example the Macom MSS20 datasheet:https://cdn.macom.com/datasheets/MSS20-xxx-x%20Series.pdfHowever, the linearity becomes increasingly problematic (more correction -> less accuracy / more noise), which is solved quite elegantly with the multipath detector approach. You have to get clever with how you select / blend / mix the signals from the paths.An additional factor which gives "back-off" from maximum ratings is the three-way splitting at the very left of the diagram.Best regards,

author: RFDx
author_rank: Regular Contributor
timestamp: March 25, 2025, 03:37:25 am
content: Quote from: EE54 on March 24, 2025, 05:07:20 pmThe low range path detector has high input impedance and is connected directly to the input, right inbetween the two 50 Ohm resistors from the power splitter. I don't think you can afford any attenuation in this path when trying to measure down to -70dBm. There are at least two diodes in every detector, probably even four in order to be able to handle the specified input power. Take a look at the MD901 (Micran), a two path power detector die that uses 2+2 diodes in the low path and a total of 10 zero bias GaAs diodes in the high path for a max. input of 24dBm in CW and max. 30dBm in pulse mode.https://micran.com/upload/iblock/f34/MD901_V01%200003.pdf
HFSS: Gap coupled microstrip resonator design tuning fail - Page 1
Forum section: electronics / rf-microwave

author: armaganergin
author_rank: Newbie
timestamp: March 23, 2025, 06:24:20 pm
content: Hi all,I need help with my Microwave Techniques II laboratory homework.The homework involves modelling a gap-coupled microstrip resonator using HFSS 3D Layout.Resonator frequency is 7 GHz.Problem 1: Can't find the gap distanceI did some analytical calculations, and most of them yielded results close to the simulation, but the gap distance is significantly incorrect. And, I don't know how to calculate properly.I found the capacitance of coupling capacitor C=0.03582 pF by calculating. Then I tried to find the gap distance by using calculators on internet, but I couldn't find any sites that take capacitance as input.https://www.signalpro.biz/calculators/microstrip_gap.htmlI used this site to find the closest value, but in the simulation, the capacitance came out as 0.013232 pF.This problem can be solved by parametric analysis in HFSS, but our lab teacher wants to see the analytic calculations for that.Problem 2: I don't know which port to look atFor finding the exact resonant frequency which port I should look at?The S11 parameter doesn't seem very informative.The S33 parameter looks like something, but the lowest points are far from the desired resonance frequency (7 GHz).The Z34 parameter has desired value 50 ohm.I don't know which of these to consider for tuning.ConclusionI am a student who has just started learning about RF and microwaves, and I have no experience with HFSS. However, since it's a simple model, I don't think there is an error. I have two questions about the model design:What difference does it make to check the negative tick for the ground plane layer, and do the ports I added affect the circuit's open circuit condition?Thank you for your help.
Playing with old radar detector - Page 1
Forum section: electronics / rf-microwave

author: joeqsmith
author_rank: Super Contributor
timestamp: March 22, 2025, 09:49:30 pm
content: My wife bought me this radar detector and I thought I would see if it still worked. First step was to make a power connector.

author: joeqsmith
author_rank: Super Contributor
timestamp: March 22, 2025, 09:56:17 pm
content: Uniden doesn't seem to have the manual for this one (PN# RD 3XL). Supports the X-band so I tried to see if I could get it to detect a signal from the LiteVNA.Used my home made horns. One attached to the LiteVNA, the other the SignalHound. Sadly, their Spike software has no provisions to support down conversion. 12GHz LO - 10.525GHz RF = 1.475GHz IF (seen with Spike). Detector placed in both H/V axis will not trip. I tried running with a 40 & 100MHz span, but no luck.Unit may be dead.

author: joeqsmith
author_rank: Super Contributor
timestamp: March 22, 2025, 11:35:00 pm
content: Lots of adjustments.
tinySA Ultra Vs Thurlby Thandar TSA1000 Spectrum Analyser Adaptor - Page 1
Forum section: electronics / rf-microwave

author: Mike99
author_rank: Frequent Contributor
timestamp: March 19, 2025, 05:18:50 pm
content: I'm aware of the limitations of the tinySA Ultra when making oscillator phase noise measurements. Is the TSA1000 any better?Mike

author: Solder_Junkie
author_rank: Frequent Contributor
timestamp: March 20, 2025, 09:25:45 pm
content: Some SDR receivers can work to much lower noise levels that a low cost SA. One example is the Microtelecom Perseus HF SDR receiver. The limitation is the frequency range and the cost... But the performance is pretty impressive.This two tone measurement of an Icom IC-7760 transceiver, using a Perseus, shows the low level background, which is much lower than I can obtain with my Rigol DSA 815TGhttp://nc0b.com/7760/SJ

author: G0HZU
author_rank: Super Contributor
timestamp: March 20, 2025, 11:41:43 pm
content: Quote from: Mike99 on March 19, 2025, 05:18:50 pmNo, the TSA1000 will be much worse. I've only glanced at the datasheet, but the TSA1000 is similar to the 'scope to spectrum analyser' adaptors designed over 40 years ago. It also looks like it has a fixed resolution bandwidth of 250kHz. This is way too wide for making phase noise measurements. It's mainly meant to be used for (casually) looking at a much wider frequency span. It's going to be very limited in terms of performance or versatility I'm afraid.

author: Mike99
author_rank: Frequent Contributor
timestamp: March 21, 2025, 12:46:49 pm
content: Quote from: G0HZU on March 20, 2025, 11:41:43 pmOK thanks, I will avoid it then.Mike
Need help Icom techs IC-375 radio - Page 1
Forum section: electronics / rf-microwave

author: WB8PFZ
author_rank: Regular Contributor
timestamp: March 11, 2025, 09:09:40 pm
content: Getting close to having my IC375 222 mhz radio operational after running 120 down the 12 volt lineOn the schematic for the main unit there is a box with the letters DAS in the box. I've looked everywhere to figure out what that stands for. Any help? Thanks Mike
Crosspost: Support for signal processing design - Page 1
Forum section: electronics / rf-microwave

author: AussieBruce
author_rank: Regular Contributor
timestamp: March 21, 2025, 09:58:08 am
content: Posted this on FPGAs. In the past I've seen references to digital SSB on ham radio chats so here it is. Any input appreciated.I have a (big) stretch goal of implementing digital SSB on an FPGA, I’ve done quite a bit of Verilog, and have an extensive background in analog electronics including signal processing and RF, but this is something else. For a while I was linked in with an Italian website/project doing that very thing, but it has wound up and I have no contacts with the remnants. Some of the members were practising communication engineers, and had access to high powered and very expensive software for HDL code autogeneration, such as the Matlab toolboxes. These can cut the development time for function blocks like FIR filters from months to hours, I doubt that my planned project would be viable without them. Is anyone aware of resources on the web or elsewhere for this level of design?

author: Simon
author_rank: Unknown
timestamp: March 21, 2025, 02:46:38 pm
content: Haven't you been here long enough to learn that by double posting you incur the wrath of just about everyone who then writes in to complain?
Advises on wearable 868MHz ISM SMD chip or "spring coil" antenna - Page 1
Forum section: electronics / rf-microwave

author: Wilson__
author_rank: Frequent Contributor
timestamp: March 10, 2025, 06:04:56 pm
content: 1. For male-sized wrist watch wearable device on 868MHz, 20 dBM2. Antenna is close to wearers' body.How to account for the de-tune effect of human body?Would it be sufficient to watch s11 reflection on a low cost nanoVNA while wearing the unit on hand. Then, may tune the L C matching network between the chip antenna and 50 ohms feed point?3. Basically 3 types of smaller than quarter-wavelength wire antenna, Chip, Spring coil and PCB.In term of saving space, willSMD chip better than "spring coil"?Seem PCB antenna will be quite large from one TI application note and also seen in many Aliexpress 1 USD Bluetooth modules at 2400MHz (will be nearly 3 times larger at 868MHz)4. Below two antenna examples, both rated at 0.5dB gain. No bad, only 1.65 dB below the ideal 2.15dBi gain of dipole.Thesecond antenna (3.2 x 1.6 x 0.5 mm) is much smallerthan the first (13.8 x 4 x 1mm). However, the recommendedPCB keep out area is "quite big and empty", making it nearly the same as the first antenna.Can I use a smaller-than-recommended keep out area without big drop in gain?Many commercial wrist watch has two or more antenna inside (GNSS, WiFi). Seem PCB layout is some what smaller than the ideal keep out area as data sheet (which is the best case and bigger area).Ant 13.8 x 4 x 1 mmPCB 15 x 9 mmhttps://www.leankon.com/wp-content/uploads/LK1840201-Product-Specification-Rev-B.pdfAnt 3.2 x 1.6 x 0.5 mmPCB 10 x 12 mmhttps://www.leankon.com/wp-content/uploads/LK1840101-Product-Specification-Rev-A.pdf5. Any other brand / model of antenna you may advise and recommend.===============posts on the forumhttps://www.eevblog.com/forum/rf-microwave/chip-antenna-47948-ground-plane-under-antenna-andor-matching-network/msg4468159/#msg4468159https://www.eevblog.com/forum/rf-microwave/chip-antenna-47948-ground-plane-under-antenna-andor-matching-network/msg4468159/#msg4468159https://www.eevblog.com/forum/projects/chip-antenna-feed-with-reference-plane-and-without-reference-plane/msg5643101/#msg5643101https://www.eevblog.com/forum/rf-microwave/vna-for-beginners/msg5567859/#msg5567859https://www.eevblog.com/forum/eda/routing-of-esp32-c3-wroom-module/msg5557929/#msg5557929https://www.eevblog.com/forum/projects/baffled-by-lora-antenna/msg5341298/#msg5341298https://www.eevblog.com/forum/projects/board-layout-tips-for-lora-chip-antenna/msg5797679/#msg5797679
eham site - Page 1
Forum section: electronics / rf-microwave

author: ME
author_rank: Frequent Contributor
timestamp: March 10, 2025, 02:50:15 pm
content: just recently when trying to view eham.net site it says wait we are checking your connection or something, This has only recently been happening,any ideas ?.

author: tggzzz
author_rank: Super Contributor
timestamp: March 10, 2025, 03:08:40 pm
content: Quote from: ME on March 10, 2025, 02:50:15 pmSeehttps://entertaininghacks.wordpress.com/2024/10/30/good-questions-pique-our-interest-and-dont-waste-our-time/especially the paragraph beginning "Say what..."See alsohttps://www.eevblog.com/forum/beginners/why-writing-style-and-grammar-matters-in-posts/

author: madires
author_rank: Super Contributor
timestamp: March 10, 2025, 03:26:01 pm
content: Cloudflare happened. Cloudflare is a CDN with DDoS mitigation and other services. Their checks can be quite annoying. And they are also known for protecting websites of criminals.
The resonant frequency of the monopole antenna - Page 1
Forum section: electronics / rf-microwave

author: monopole lover
author_rank: Newbie
timestamp: March 21, 2025, 12:01:08 pm
content: I recently measured the S11 curves of a 2.4GHz monopole antenna in air and water. The resonant frequencies were 2402.42MHz and 2032.82MHz respectively. Theoretically, the resonant frequency in water should be the antenna operating frequency 2400MHz divided by the relative dielectric constant of water in the square root(80), which is 268MHz. Why is the experimental result so different? I have changed the container of different sizes.Should I choose a monopole antenna with a ground plane from other literature?

author: radiolistener
author_rank: Super Contributor
timestamp: March 21, 2025, 03:49:57 pm
content: The half of your antenna (the cable) is placed in the air. The second half is placed partially in the water - quarter of its size is outside water and the second quarter is covered with plastic and with air inside. So, technically about 80-90% of your antenna surface is placed in the air, outside water.you're need to uncover antenna and put it fully in the water, include the cable, and add RF-choke on the cable to avoid radiation from cable.You can tear-down your antenna and most of all you will find that actual size of antenna is much shorter than plastic cover.

author: szoftveres
author_rank: Regular Contributor
timestamp: March 22, 2025, 12:28:16 am
content: 1) The black plastic dominates the first millimeters around the antenna, consequently the immediate conductor will never experience the full (78) Dk of water.2) That's still pretty thin layer of water medium and the water-glass-air boundary is less than a full wavelength away from the antenna body. And since this boundary is steep (huge difference between the Dk of water vs. air), reflections will go back to the antenna.Try measuring a bare copper inner conductor sticking out of a coaxial cable, in- and out of a bathtub of water. And make sure that the coaxial cable goes deep as well - an antenna is only monopole when there's a ground plane, otherwise it's some kind of imperfect (non-symmetrical) dipole.I'd be curious to see if the expected 268MHz will ever show up on the VNA - even if the antenna is resonant at a lower frequency, its impedance in a Dk=78 medium will likely not be 37ohms, but something entirely different (perhaps only several- or fraction of ohms).Good luck!
Something about to much current used by a car radio - Page 1
Forum section: electronics / rf-microwave

author: Sassy Taste
author_rank: Contributor
timestamp: March 04, 2025, 07:34:26 pm
content: That's great. I know the schematic symbol for the antenna. Like a car radio, I made a boom box from an old car radio and used a car speaker to place all in one on a boom box. The Total ohms to this box is 3.2 ohms. Only 12 volts hooked up and it doesn't vary. Constant yellow wire. But From the battery, always there is a 2.72 voltage drop across the whole music box. About 2.9 ampere measuring when it is flowing. The music box is turned on. Just that no reception yet. It couldn't be the antenna because the reception area is probably too far away to the radio station. So cannot catch anything, but still on. I don't think I need to solder any thing on directly to the PCB radio board. So either the location or volts entered into the box is my solution to the low reception or no reception to the music box. Here is my box I made. And this should be easy for you engineers on the forum. That is my project this morning.

author: CaptDon
author_rank: Super Contributor
timestamp: March 08, 2025, 02:33:53 pm
content: Can't even make sense of your post!!!! Can't receive any stations, what did you do wrong?My car radio on the bench with a 3 foot piece of wire still gates about 50 stations. 2.72 volts across the radio, what the hell does that mean?You are supplying 12 volts and only 2.72 arrives at the radio or are you losing 2.72 volts down from the 12 volt supply??? And your post seems to be of someone else's project. Grammar is kind of weird, what is your native language?

author: Gyro
author_rank: Super Contributor
timestamp: March 08, 2025, 02:43:07 pm
content: The OP was banned on the 4th, you're wasting your time.

author: CaptDon
author_rank: Super Contributor
timestamp: March 08, 2025, 07:02:49 pm
content: Sorry, didn't see 'banned'. I only saw 'Warned'. No problem, I even reported one of his posts as A.I. generated spam. Cheers!!
MPX Generators - Page 1
Forum section: electronics / rf-microwave

author: watchmaker
author_rank: Unknown
timestamp: March 08, 2025, 01:47:17 pm
content: So my interest in radio finally got ignited. (2nd order pun).Two weeks ago I bought and repaired a Sencore MPX 124 generator for small change (for me $50 and under). Sencore certainly deserved its reputation. Solder joints that never were, wires that pulled cleanly out of the PCB every time I opened it, etc. THEN, someone had attempted to get it running (w/o attending to the never soldered joints) so there was his solder mess to clean up. Anyway, it now transmits.THEN, this week I find someone has written a Python script to do precisely this on a Siglent 1032. What is this world coming to?https://github.com/evrenbaris/FM-Signal-Simulation-Using-PythonEven got a mention on Siglent App Notes.
Spice model file for SMS7630 (diode schottky) - Page 1
Forum section: electronics / rf-microwave

author: haniy
author_rank: Newbie
timestamp: February 20, 2025, 10:22:24 am
content: hello,I was wondering if anyone would know or have the spice model for this particular diode...I have looked through its data sheet but all that I could find is its SPICE model parameter but not the file itself.(i'm working on a Rectenna and using this diode as the rectifier circuit). please help :'(

author: graybeard
author_rank: Frequent Contributor
timestamp: February 21, 2025, 10:27:53 am
content: The model is printed in the spec sheet.https://d1ehax0mqsd4rz.cloudfront.net/-/media/SkyWorks/Documents/Products/201-300/Surface-Mount-Schottky-Diodes_200041AH.pdf?rev=db5886f1a17c43a6a2b047deb5f2afdc

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: February 21, 2025, 07:13:08 pm
content: Hi,You can create the model like this:The '+' is a continuation symbol. It saves having a long model definition.I have attached the LTspice file.This is similar to Figure 3. on the datasheet.Regards,Jay_Diddy_Bsms7630 model.asc(0.59 kB - downloaded 93 times.)

author: haniy
author_rank: Newbie
timestamp: March 04, 2025, 09:22:26 am
content: Hello,thank you so much for the reply. I am currently using CST studio to simulate the rectenna and for the spice model it only uses .cir, .sp, .lib, .mod, .net.Since the example you gave me was in .acs, I tried to save the file in .cir but it doesnt seem to work. I'm sorry but, do you have any suggestions on what to do? :'(

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: March 04, 2025, 12:33:09 pm
content: Hi,I have attached the model file. Change the extension from .txt to .libJay_Diddy_Bsms7360.txt(0.13 kB - downloaded 89 times.)

author: haniy
author_rank: Newbie
timestamp: March 05, 2025, 09:12:50 am
content: hello again,yes, i have tried to save from .txt to .lib, but this error will occur :Job 27937: Lumped element circuit simulation (Folder1:diode1): SPICE file needs to have exactly one 2-terminal subcircuit.I dont really understand, if anyone does, can you help explain what i need to do, please.

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: March 06, 2025, 01:01:36 pm
content: To convert the model to a subckt model:Code:.SUBCKT SMS7630 1 2D1 1 2 SMS7630.model SMS7630 D(+Is =5E-6+Rs=20+N=1.05+TT 1E-11+CJO =0.14E-12+M=0.40+EG=0.69+XTI=2+FC=0.5+BV=2+IBV=1E-4+VJ=0.34).ENDSThis puts the previously created diode model inside a two-terminal sub-circuit.Jay_Diddy_B
Kenwood TS-790A S-Meter issue - Page 1
Forum section: electronics / rf-microwave

author: Crambone
author_rank: Frequent Contributor
timestamp: March 18, 2025, 05:15:31 pm
content: I have a TS-790A and the S-Meter isn’t working in ALC or RF position on 144MHz during TX, it does show signal on RX. It also works on 430MHz both TX and RX with no issues.I’m hoping someone can point me in a direction or explain the path the S-Meter takes on the 144MHz.I do have full power output on a bird meter on 144MHz just no S-Meter movement?Here is a link to the Service Manual.https://www.ko4bb.com/manuals/104.28.55.227/Kenwood_TS-790.pdfAny help would greatly be appreciated.Andrew

author: Crambone
author_rank: Frequent Contributor
timestamp: March 20, 2025, 03:25:53 pm
content: Anyone?
openEMS/gerber2ems from KiCAD ports are positioned wrong - Page 1
Forum section: electronics / rf-microwave

author: prutser
author_rank: Regular Contributor
timestamp: November 23, 2024, 06:04:21 pm
content: I am new to EM simulation. I started with simulation of a GCPW drawn in KiCad using gerber2ems and openEMS.After simulation, the S plots were completely whacked. I opened the generated geometry in appCSXcad and noticed the ports are completely off the expected position.In KiCad both ports have the same "Y coordinates" (at the center of the track). In the generated geometry they are both at different Y position and neither of them is at track center.I also get some warnings:[14:41:18] Port #0 is defined twice on the board. Ignoring the second instance[14:41:18] Port #1 is defined twice on the board. Ignoring the second instanceBut the same warning I get when running one of the examples.Anyone experience with this ?

author: tongkai
author_rank: Newbie
timestamp: March 04, 2025, 08:37:59 am
content: have u solve the problem?I encountered a problem like this.[07:40:45] Postprocessing[07:40:45] Adding virtual portsTraceback (most recent call last):File "/home/codespace/.python/current/bin/gerber2ems", line 8, in <module>sys.exit(main())^^^^^^File "/home/codespace/.python/current/lib/python3.12/site-packages/gerber2ems/main.py", line 57, in mainpostprocess(sim)File "/home/codespace/.python/current/lib/python3.12/site-packages/gerber2ems/main.py", line 126, in postprocessreflected, incident = sim.get_port_parameters(index, frequencies)^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^File "/home/codespace/.python/current/lib/python3.12/site-packages/gerber2ems/simulation.py", line 451, in get_port_parametersport.CalcPort(result_path, frequencies)File "/home/codespace/.local/lib/python3.12/site-packages/openEMS-0.0.36-py3.12-linux-x86_64.egg/openEMS/ports.py", line 117, in CalcPortself.ReadUIData(sim_path, freq, signal_type)File "/home/codespace/.local/lib/python3.12/site-packages/openEMS-0.0.36-py3.12-linux-x86_64.egg/openEMS/ports.py", line 321, in ReadUIDataself.u_data = UI_data(self.U_filenames, sim_path, freq, signal_type )^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^File "/home/codespace/.local/lib/python3.12/site-packages/openEMS-0.0.36-py3.12-linux-x86_64.egg/openEMS/ports.py", line 43, in __init__tmp = np.loadtxt(os.path.join(path, fn),comments='%')^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^File "/home/codespace/.local/lib/python3.12/site-packages/numpy/lib/_npyio_impl.py", line 1396, in loadtxtarr = _read(fname, dtype=dtype, comment=comment, delimiter=delimiter,^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^File "/home/codespace/.local/lib/python3.12/site-packages/numpy/lib/_npyio_impl.py", line 1046, in _readarr = _load_from_filelike(^^^^^^^^^^^^^^^^^^^^ValueError: the number of columns changed from 2 to 1 at row 54; use `usecols` to select a subset and avoid this errorconfused!!!
DC Power Cable as antenna - Page 1
Forum section: electronics / rf-microwave

author: JoeyG
author_rank: Regular Contributor
timestamp: February 10, 2025, 06:29:58 am
content: Looking at 2.4GHz or 900MHz or 433MHz antennas that use the power cable as the antenna with coupling an RF chokes.12/24V DC. The DC cable length > 10m to the device transceiver.Any ideas and concepts would be appreciated.

author: radiolistener
author_rank: Super Contributor
timestamp: February 10, 2025, 08:07:28 am
content: There is no sense to use cable as VHF/UHF antenna. And here is reasons of that:1) DC cable is connected to extreme high noise sources, so it's better to use separate nail, or just a small piece of wire which is not connected to DC, because it will give you better SNR even with low aboslute efficiency.2) VHF/UHF don't needs large antenna3) DC cable is represented as a symmetric ladder line or even worse - shielded wire which is like coax feeder, so this is very bad antenna, because it's physical geometry avoid radiation. In order to use it as effective radiator you're needs two separate wires which are directed at different directions, but such kind of wire is useless for DC.In short, it gives a lot of issues and no advantage, especially for VHF/UHF bands and with digital devices and SMPS which these days are everywhere...Technically, it's like using a high-power arc welder for high-precision gene editing operations. Or like attempt to use a dirty woodcutter's axe in machine oil and sawdust as the main instrument for sterile, high-precision neurosurgical operations on humans...The antenna needs to be shielded as much as possible from DC power cables, because this is the main noise interference source.

author: Sassy Taste
author_rank: Contributor
timestamp: February 27, 2025, 05:28:40 pm
content: You want to make your own wi-fi station? The station I have uses coaxial cable that leads outside to the telephone post, leads 30 miles to the main hub. Source or company. Try ask the engineers at your location how they built that machine. I would think the same underlying concept. But how'd they patent it. Only their machine can work? Engineering.Also the local hub box receives 2.4 Ghz and up frequencies from a lab top computer. The local hub is connected to some module using ethernet cables. Or fiber optics used. From higher frequencies locally. Then they transfer speeds to the transfer guides main telephone line. All the machine does is detect information and sends it as packets to the main hub. To be decoded there then unto the pc. Each transfer of packets requires protocol. We are dealing only with one protocol. The computer and the programs that run it, on that machine ( small antenna ). Modern engineering and wow.
Problem with wireless microphone receiver  - Page 1
Forum section: electronics / rf-microwave

author: sgaudio
author_rank: Newbie
timestamp: February 23, 2025, 11:22:39 pm
content: Hello,how are you ?Thank you for your help in previous postWith your help and some deep search on textbooks i confirmed that this is spectrum is from frequency signal of pilot tone at 30.72 khz from microphone transmitter icThe microphone works but it is a big problemWhen i open microphone and synchronize with receiver and s it makes a crackling noise especially when you are close to receiver or you have another wireless systems nearbyI scanned the area,i changed a lot of frequencies but problem not solvedWhat do you suggest to test or inspect ?Thank you

author: ryanbrubacher
author_rank: Newbie
timestamp: February 26, 2025, 06:06:46 pm
content: Would you be able to share which model of microphone and receiver you are using?Is it possible you are either overloading the front end of the microphone receiver with the microphone transmitter, or the other near by wireless system? Can you adjust the squelch control on the system? If the receiver has a factory reset, you could reset it to default parameters and see if the issue goes away.
quansheng uv-k5 firmware - Page 1
Forum section: electronics / rf-microwave

author: ME
author_rank: Frequent Contributor
timestamp: February 20, 2025, 02:25:22 am
content: I just got a hf with blutooth board to fit to my k5, Any idea what firmware i need to make the blutooth work as well as the hf rx when the new board has been fitted?,thanks.https://www.aliexpress.com/item/1005008229340098.html?spm=a2g0o.detail.pcDetailBottomMoreOtherSeller.2.5fdadwnNdwnNrX&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.40196.404796.0&scm_id=1007.40196.404796.0&scm-url=1007.40196.404796.0&pvid=4922166c-c846-4a6c-86fe-9f9d9a6bd64a&_t=gps-id:pcDetailBottomMoreOtherSeller,scm-url:1007.40196.404796.0,pvid:4922166c-c846-4a6c-86fe-9f9d9a6bd64a,tpp_buckets:668%232846%238114%231999&pdp_ext_f=%7B%22order%22%3A%229%22%2C%22eval%22%3A%221%22%2C%22sceneId%22%3A%2230050%22%7D&pdp_npi=4%40dis%21GBP%2117.00%2111.39%21%21%21151.65%21101.61%21%40210391a017400182039883269e852e%2112000044304680852%21rec%21UK%212308464272%21XZ&utparam-url=scene%3ApcDetailBottomMoreOtherSeller%7Cquery_from%3A

author: drspastic
author_rank: Contributor
timestamp: February 25, 2025, 07:05:22 pm
content: you should look on the uvk5 telegram group. there are 2 main groups, one for mere mortals, and the dev group. the guys there are the ones at the cutting edge of uvk5 hacking from the very start. very friendly and the devs do miracles.https://t.me/quansheng_uvk5_enhttps://t.me/quansheng_uvk5_en_devthere are other specific language groups they may direct you to if you prefer
Protek 3201 spectrum analyzer service manual request. - Page 1
Forum section: electronics / rf-microwave

author: czorgormez
author_rank: Contributor
timestamp: April 21, 2022, 07:43:05 pm
content: i have one faulty Protek 3201 spectrum analyser, somehow receiving frequency is shifted around 5 mhz. so i need service manual or at least schematics of this device.

author: alias095
author_rank: Contributor
timestamp: August 26, 2023, 02:16:29 pm
content: Please help with service manual and dump epprom, my 3200 do not power on.

author: alias095
author_rank: Contributor
timestamp: November 28, 2023, 03:13:05 am
content: https://www.radiomuseum.org/r/hungchang_protek_2_ghz_rf_field_analyser_3200.html#imagescan download with high resolution?

author: alias095
author_rank: Contributor
timestamp: December 10, 2023, 07:59:46 am
content: ..

author: alias095
author_rank: Contributor
timestamp: March 23, 2024, 06:01:17 am
content: https://www.radiomuseum.org/r/hungchang_protek_2_ghz_rf_field_analyser_3200.htmlcan download with high resolution?

author: RFDx
author_rank: Regular Contributor
timestamp: March 24, 2024, 06:26:25 pm
content: Quote from: alias095 on March 23, 2024, 06:01:17 amYes. Change to the "SCHALTPLÄNE" tab, scroll to the service manual page(s) you need, click on the picture to get the request form and provide name/email to get a download link. You have to do that foreverypage you need. The limit is 3 requests (downloads) per day and max. 10 per month.

author: alias095
author_rank: Contributor
timestamp: March 30, 2024, 01:42:12 am
content: I'm not registered on the site, I can download the diagram, but the quality is very poor

author: alias095
author_rank: Contributor
timestamp: March 03, 2025, 03:47:17 am
content: can download with high resolution?
HP89441A confusion - Page 1
Forum section: electronics / rf-microwave

author: RikV
author_rank: Regular Contributor
timestamp: February 23, 2025, 09:39:38 am
content: I ran into a "89441A Vector analyzer from DC to 2.5GHz. So I looked up what this is in reality. Seems to be a "family" of instruments Where the 49410A is the the display unit and IF (0-10MHz). The 89441A should be a downconverter that sits under the 49410. Clear? So the 49410A seems not so usefull in its own.Bu then it becomes unclear: the device for sale is a display unit but is marked "49441A DC-2650MHz vector signal analyzer"It only has BNC connectors, no N-type one would expect in the GHz range! On the other hand I found pictures of 49410A saying DC-10MHz vector signal analyzer.I looked in the manuals only to see there is a mass of options available concerning functionalty and bandwith. No clear evidence qs to whether the display unit would be upgradeable to 2.6GHz or not.Anyone out there who can give more insight?

author: Uky
author_rank: Regular Contributor
timestamp: February 23, 2025, 10:35:53 am
content: An 89441 consists of two units:- The upper one, the 89410 is a 0...10 MHz RSA featuring both an anayzer sectionas well as a generator section where varoius, mostly older modulation type RF-signals can be generated.- The bottom unit that features only an on/off switch, two BNC-and N-connectors (if the "Source option" was specified during ordering)is the transverter.An instrument sold as 89441 consists of these two units, the upperlabeled "89441 Vector Signal Analyzer (IF)" and the lower unit "89441 RF-Unit".(The lower unit itself has a designation "89431A")Two short BNC-BNC coax links connect the upper units "Source" and "Channel 1"to the lower unit.With the bottom unit, the 89441 can be used as a general scalar spectrum analyzerup to 2650 MHz. Or - if vector mode is used, as a RSA with some 7 MHz bandwidthfor detailed demodulation and quality of the input signal can be observed.The top unit communicates with the bottom unit using RS232. The bottom unitalso contains a high stability oven that is also connected to the TOP-unitby a BNC-BNC coax link on the rear.These instruments came with alarge variety of options. The most (for amateur radioethusiasts) interesting one is the spectrogram option.Various options can be enabled by clever decoding and altering of thesystem configuration. Information how-to floats around on the internet.The mod is done by saving the configration on a 3" floppy,altering some content using a HEX-editor and then uploading the file back tothe IF-unit, overwriting the original configuration...If you do not have the lower RF-unit, the top unit will behave like the 89410once it realizes that there is no RF-unit connected (lack of RS232 communication).

author: RikV
author_rank: Regular Contributor
timestamp: February 23, 2025, 11:07:20 am
content: Thanks, Uky, this confirms my idea that the display unit on its own is prettye useless to me. Pitty. I could not fint a 89431A on the net.. So this will be a no-go.
RFT SMV 6.1 manual - Page 1
Forum section: electronics / rf-microwave

author: MrWifiHifi
author_rank: Regular Contributor
timestamp: February 21, 2025, 07:55:49 am
content: Hi,I recently acquired this measuring equipment, but it came without a manual.Does anyone have a manual with schematics in PDF format?I would be very thankful for any help.
lunar wifi - Page 1
Forum section: electronics / rf-microwave

author: coppercone2
author_rank: Super Contributor
timestamp: February 19, 2025, 12:54:17 am
content: https://www.technologyreview.com/2025/02/18/1111984/nokia-is-putting-the-first-cellular-network-on-the-moon/That looks like interesting workMaybe we can finally get radio towers on the moon.
Manual/Connection Diagram needed for Microlog ATR-6800 - Page 1
Forum section: electronics / rf-microwave

author: scopeman
author_rank: Frequent Contributor
timestamp: February 18, 2025, 05:28:47 am
content: I am desparately looking for a connection diagram or a manual for the Microlog ATR-6800 version like the backpanel pictured. I was hoping that someone on this forumeither has a manual or knows a ham that has one of these units. I recently found this for a 98 year old ham friend of mine, a former Chief Engineer of WNEW in NYC and WW2 veteran.I really would like to get this unit operational for him.Any help would be greatly appreciated!Thank you,SamW3OHM
replace missing RF remote unison research - Page 1
Forum section: electronics / rf-microwave

author: leloga
author_rank: Newbie
timestamp: February 19, 2025, 11:27:53 pm
content: Hello everyone,I hope you're all doing well.I have a Unison Research Unico Pre preamplifier, which comes with an RF remote control featuring two buttons to adjust the volume (up and down).Unfortunately, I don't have the remote control anymore.I'm looking for a replacement solution.The Unison Research distributor in France told me that the RF remote is no longer available for purchase.I received partial information from someone at Unison Research, but I'm still trying to figure out how to get a remote working with my preamp.I've found the RF receiver board inside the preamp.According to the manufacturer, there is a button on the board that switches the receiver into rolling code mode, allowing the remote to be paired.My main question:Without the original remote, is it possible to pair any RF remote control?I tried using a 433.92 MHz garage door remote, but it didn't work.For reference, when I press the red button on the receiver, a red LED lights up.I assume this means the receiver is in pairing mode.Here’s a photo of the receiver module from a similar device I found online:https://i.ibb.co/0pCxPvVF/DSC00044-remote-unson-research.jpgIt's the same module in my preamp, but I couldn’t take a picture because the board is upside down and hard to access.If anyone has an idea of how to find a compatible remote, that would be amazing!Manufacturer’s response regarding the remote:"Radio remote controls are rolling code and are paired by pressing the red button on the receiver board."So, this works if you have the original remote... But since I don’t, and I can’t buy one anymore, what can I use instead?Thanks a lot for your help!

author: bigendian
author_rank: Regular Contributor
timestamp: February 20, 2025, 09:48:14 am
content: I would start with a better picture where all components marks are readlable.Also, a schematic is maybe available ?

author: leloga
author_rank: Newbie
timestamp: February 22, 2025, 11:37:26 pm
content: Unfortunately, there is no schematicMany thanks for your helpthe board is head upside down against the bottom of the preamp.I've a photo from internet, which is exactly the same.I've had a short contact with someone from unison research which says that they don't sell anymore the remote and have no infos.Only one : perhaps it's 315 Mhz... but perhaps.And there is a button to pair the board with the remote control.I'ce read a chip with white paper on it : RX4CCVA1All the very best
Adding a 10.7 MHz marker to BK 2020a - Page 1
Forum section: electronics / rf-microwave

author: Talli
author_rank: Newbie
timestamp: February 15, 2025, 04:36:16 am
content: trying to figure out how to use a function generator and an oscilloscope to align FM radio, for fun., still trying to figure out how it's done, however most online tutorials, you need a sweep function generator with a marker, the BK 2020A, does not have a marker, built in, can I build an external circuit to use it with the BK function generator, to add a 10.7 MHz marker, and to show on an oscilloscope.

author: radiolistener
author_rank: Super Contributor
timestamp: February 15, 2025, 07:50:03 am
content: just setup some level for noise blanker and some frequency on receiver and then use signal generator to find lowest and highest frequency where noise blanker switch. The middle between these frequencies will be the center.

author: CaptDon
author_rank: Super Contributor
timestamp: February 15, 2025, 04:27:35 pm
content: I can't even find a manual for the 2020a model? You need to really have a lot of experience before you dink around with FM alignment!! You probably also need an RF Detector Probe to sweep the I.F. of an FM radio. You are going to run into problems with the limiter circuits messing up the apparent response curve of the sweep. And where in the receiver do you plan to attach the sweep frequency input? How do you expect to align the 19/38KHz section for stereo demodulation? You may try setting your generator for 10.7MHz and adjust the output to show a weak signal on the receiver signal meter and the move the generator to 10.65MHz and 10.75MHz and see that the reduction in signal strength is equal.