hybridfree/eevblog-posts huggingface dataset:
Need help with identifying a coax connector something uses..  - Page 1
Forum section: electronics / rf-microwave

author: Mister-H
author_rank: Newbie
timestamp: May 05, 2022, 11:41:22 pm
content: Hi..I'm currently trying to find out what type of coax connector this WiFi daughter board of a Sony product uses.. I've searched the interwebnetz high and low.. Though the only similar connector I can find.. Is MCX.. And while it seems similar in dimensions to an MCX connector.. It's still physically different.. Which leads me to believe.. It maybe propitiatory to the WiFi daughter board and the antenna it was originally meant to go with..That antenna in question.. Is an Hitachi het01-so01.. Which I've also tried extensively searching for.. Though annoyingly.. And as to be expected.. Searching the interwebnetz high 'n' low again.. Has churned up very little results on it.. Plus it doesn't seem to have an FCC ID either.. Which doesn't help.. As it gives me very little to go on either.. Though I guess it shouldn't be that much of a surprise to anyone.. As it seems to be a niche.. Small volume production item it self..So I'm hoping someone here can help with identifying this pesky coax connector.. So I can find a lead that will adapt it to something more common.. OR at least.. Help me knock up my own adapter lead.. So I can at least have working WiFi on device that uses that WiFi daughter board..The jack on the WiFi daughter board in question:And the connector the propitiatory Hitachi antenna uses:The antenna array end it self:

author: antenna
author_rank: Frequent Contributor
timestamp: May 06, 2022, 03:21:15 am
content: why not just remove the connector from the board and solder on an SMA?

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: May 06, 2022, 04:46:59 am
content: Would you please take the exact dimensions? Especially micro coax connector series are proliferating immensely and why should the task be harder than necessary?

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: May 20, 2022, 01:58:38 am
content: Looks like SMB sortof.Jeff

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: May 20, 2022, 02:24:18 am
content: maybe FAKRA, but as I said, hard guess without dimensions.

author: amyk
author_rank: Super Contributor
timestamp: May 20, 2022, 02:32:33 am
content: Quote from: Neomys Sapiens on May 20, 2022, 02:24:18 amAgree on the dimensions, but why would a Japanese company use a German part? I'd look at the catalogs of companies like Hirose and JST first.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: May 20, 2022, 02:55:56 am
content: Quote from: amyk on May 20, 2022, 02:32:33 amIt is the prescribed RF connection system in most Euro cars.

author: cos000
author_rank: Newbie
timestamp: January 07, 2025, 09:28:40 pm
content: HelloDid someone find a suitable solution?Thank you
what would it take to get a sdr connected to sata? - Page 1
Forum section: electronics / rf-microwave

author: coppercone2
author_rank: Super Contributor
timestamp: January 08, 2025, 07:48:27 am
content: I was thinking about bays, and its easy now to have a free bay in a computer (5.25 inch bay) or perhaps even a stack of 2 or 3 of them.The position of the ports is correct, because its easy to disconnect a feed line from the computer when you are done working. There is alot of room for adding shielding.Right now most options are USB, but I was wondering if its possible to connect it to sata.How might a solution look? Its a interesting computer and EE project, even if its just easy to plug it into a USB port. I am thinking it might be the only plausible reason I might try to learn something on SATA level.The learning parts would be1) enclosure design (shielding), grounding issues2)power/signal filtering to work inside of a computer in the drive bays without degrading the spec of the SDR3) driver/digital protocol stuff. Is there any issues with like NDA's on the drivers/interfaces to actually get a custom device to connect to a modern computer SATA (TPM? certs?)I think it would be a really good project.I have seen some silly computer in a computer meme like mods, but I am thinking about this in a serious way that the end result is functional. National instruments kind of does this, but its more for the card slots (It might be PCIE). I heard of custom hardware that used ISA, but never a sata.

author: DaJMasta
author_rank: Super Contributor
timestamp: January 08, 2025, 08:10:46 am
content: While SATA may be a decent interface (and I'm not so sure about this for how BIOS/OSes handle it), why bother? It's less compatible, less fleshed out, and has already been phasing out in the last 10 years. USB has a lot of advantages (and in newer flavors, a ton of bandwidth), but the obvious alternatives would be gigabit ethernet (or 10G ethernet if you really want crazy bandwidth) or PCIe, which is the basis for add in cards and most current day storage means (and is basically Thunderbolt and DisplayPort over USB, right?)SATA is lower bandwidth, harder to physically access, and likely has some serious protocol/implementation disadvantages given there are next to no commercial implementations of other peripherals than storage on it, even externally.NI uses PCI (older) or PCIe based, and their PXI (PXIe) chassis are basically just a different connector/form factor for the same standard. MXI (MXIe) is just PCI (PCIe) over an external cable, and they do USB and ethernet based options (USRP devices come to mind) too.I'd sooner pick a M.2 sized add in card using a PCIe standard (like a modern WiFi card or an NVME drive), though I'd expect the small form factor to be a potential issue.

author: magic
author_rank: Super Contributor
timestamp: January 08, 2025, 10:40:03 am
content: USB 3.2 can push 10Gb/s or 20Gb/s over dual lane type C cables. That's faster than the fastest SATA.You can run PCIe over USB cables, there are lots of off the shelf adapters for this made for crypto mining rigs.
8753D cal std "offset delay" definition - Page 1
Forum section: electronics / rf-microwave

author: Dobby
author_rank: Newbie
timestamp: December 28, 2024, 05:40:31 pm
content: Using HP 8753D VNA. Have S11 "calibration open" that is 51 ps (one way) from connector interface to termination impedance plane. When entering the calibration standard's "offset delay" is it simply 51 ps (not -51 ps, 102 ps, etc) ? Thanks
How to get S11 from VSWR(S11) ? - Page 1
Forum section: electronics / rf-microwave

author: rdpdo
author_rank: Contributor
timestamp: December 28, 2024, 08:48:40 am
content: Hello,I got experimental results from a flat cable from molex and I want to extract S11 from ref FFC-15021-0415.Molex cannot give me the S-parameters files so I want to extract data from graphs.My aim is to obtain S11 and then use FFT to get TDR response on it so I can after get TDR of impedance along the line.I got VSWR(S11) measurement from a molex flat cable 4 inches long and I want to obtain S11, so I do : S11 = (VSWR-1)/(VSWR+1) but the result I got is not consistent...My experimental data are the one below :I import the value to Matlab using a tool to extract the data :and after extracting the magnitude from the db and done the math in Matlab and I got this :Normaly S11 would be something periodic along the frequencies like the one below but it is not the result I got ...Any idea ? Thanks you !

author: mtwieg
author_rank: Frequent Contributor
timestamp: December 28, 2024, 01:48:34 pm
content: I'm betting that those plots are just S11, S22, etc plotted in dB, and the "VSWR" labels were just added after the fact (makes no sense to plot VSWR in dB in the first place).So if you want to convert from the trace in dB units just do |S| = 10^(SdB/20)Of course this will only give you the magnitude of S, which probably isn't going to model TDR behavior properly.Yes, often VSWR and S11 show a periodic shape, but it depends on the cable. I'm guessing you would see this in longer cables of the same type.

author: eb4fbz
author_rank: Regular Contributor
timestamp: December 28, 2024, 10:33:56 pm
content: Molex graphs are showing |S11| instead of VSWR so you don’t need to do anything. Unfortunately you are missing phase information. You can’t transform RL magnitude to the time domain.
impressive extrasolar QSO  - Page 1
Forum section: electronics / rf-microwave

author: coppercone2
author_rank: Super Contributor
timestamp: December 23, 2024, 05:55:39 am
content: https://science.slashdot.org/story/24/12/21/0612239/voyager-1-signals-from-interstellar-space-detected-by-amateur-astronomers-on-1950s-telescope

author: pardo-bsso
author_rank: Frequent Contributor
timestamp: December 24, 2024, 01:09:17 pm
content: Direct link to the article:https://www.camras.nl/en/blog/2024/dwingeloo-telescope-receives-signals-from-voyager-1/(still use Slashdot and Hackaday but this seems better than having to go thru both)

author: coppercone2
author_rank: Super Contributor
timestamp: December 24, 2024, 03:06:07 pm
content: the slashdot has a update from the people that did it in the description (the parent article they linked was not edited for correctness at the time of posting,but the slashdot editors did)the original article seems to have the correct frequency of 8.4GHzI wanna see the reciever setup

author: pardo-bsso
author_rank: Frequent Contributor
timestamp: December 26, 2024, 01:36:25 pm
content: Nice detail.Sorry that I missed it.
looking for info about TUAAM - Page 1
Forum section: electronics / rf-microwave

author: kleiner Rainer
author_rank: Regular Contributor
timestamp: December 23, 2024, 08:54:52 am
content: Greetings,I inherited a Racal BCC 543, a "Tuning Unit, Automatic Antenna Matching", also known as TUAAM. This device matches a 2m long whip antenna in the range of 30MHz to 76MHz and also serves as a preselector/band pass filter. My plan is to use it on the 4 and 6m bands. After a long search, I found some infos how to activate the tuner (there is an initiator box with a handful of components that is easy to build).What I could not find was a schematic, and, more important the special 7-pole connector for the control interface. Since the tuner will be placed at the base of the antenna, a waterproof solution is necessary - so the original connector is preferred.Does anybody know the exact name/specification/part number of the connector, and where to get it for a fair price?Greetings,Rainer DG1SMD

author: Robert763
author_rank: Super Contributor
timestamp: December 25, 2024, 12:20:46 pm
content: Just search for clansman 7 pin male connector on ebay.Might be as easy / cheap to buy a handset. PTT or interconnection lead. It's the same plug as used on the RT350 and other clansman radio audio connectors. However as the connector is male and the center pin (G) is not used on the TUAAM you can also use the more common 6 pin version of the connector.There are many makes and part numbers that will fit depmding on solder / crimp / cable relief / colour / nut style etc.Robert.

author: kleiner Rainer
author_rank: Regular Contributor
timestamp: December 26, 2024, 12:16:45 pm
content: Thanks Robert,I will check eBay. Seems this connector family conforms to Mil-C-26482 Series 1 Style, and tt electronics calls them "AB06".Greetings,Rainer
Looking for this GaASFET(need model) - Page 1
Forum section: electronics / rf-microwave

author: teatime
author_rank: Contributor
timestamp: December 18, 2024, 01:29:11 am
content: The GaASFET marked "182", but it's not the actual model.I have attached the schematic and some photos.The working voltage of this GaASFET is about +13.5v, gate is a negetive voltage.Frenquency band is 1GHZ - 3GHZMaybe some person can identify the manufacturer via the outline.Thank you very much!

author: squadchannel
author_rank: Frequent Contributor
timestamp: December 18, 2024, 01:41:21 am
content: MRF182R1

author: teatime
author_rank: Contributor
timestamp: December 18, 2024, 03:07:24 am
content: Thank you for your fast reply.But I think MRF182 is incorrect.The working frequency band from HF to 1GHZ.And the Gate is positive voltage.The outline also different.

author: eb4fbz
author_rank: Regular Contributor
timestamp: December 23, 2024, 01:38:16 pm
content: Could be a NEC part from the same family as NES1823P-30
Datasheet MA106 - Page 1
Forum section: electronics / rf-microwave

author: hb9mfl
author_rank: Newbie
timestamp: December 22, 2024, 10:47:23 am
content: Hi I am looking for the datasheet of the low noise opamp DIL 8 opamp MA106.tnx Armin Hb9MFL

author: kleiner Rainer
author_rank: Regular Contributor
timestamp: December 22, 2024, 12:38:16 pm
content: Maybe a selected version of Ferranti ZN459/460?60dB gain, but slightly higher noise level than MA106:https://www.alldatasheet.com/datasheet-pdf/view/150122/ETC1/ZN459.htmlGreetings,Rainer DG1SMD

author: PA0PBZ
author_rank: Super Contributor
timestamp: December 22, 2024, 02:42:04 pm
content: https://analytics.supplyframe.com/trackingservlet/track/?r=0x34EY99PS_gIu2qWuzU9-Tyq0STFNRf76qStWuXLeGZK5iljKdIGyDK_NyozGYYJtJtlrqiafQWYaJ5P72pddzg4MDVmsZexcj2_HW2SHgwBthWKloeQzNBTViEny3089ghp96_6dYgDMuLHlZTqm_ME2jC7wom6CcitIcUCqXHhE0i9zMlhlhs_onD-VS22yjSBX1CBxnA28jon3n4DO9Z1kJ5n9lMrcqPN7dNIJZS98rZX4f9FDD7lmKqBh43oDR6qP3Px2yUVF-6c1Nu54Q4WQfphBR6J4W_l73v8Y76Jx-HF8zCd7zlk0uIcHb6OZjk_iUSaXlU4rgXNVi-aIUbIPEmoxmWscgAtu-fWYucPLyVQrAlST8Gff8m3CtzHjOU2SNHkIsrbe7bC1uzfFe-NogPY60Xhk5uMuc6k7R5alU51hQ0ITUwctvpTJpELAhI8hJC6_pAsLCT8eD9rJPma7FnHrGA-JN2kdSvvl6zPvkmIHDuxQpMx5II2hJmkKOfZ0Fvj7yvaoEd08A8b2wj4gLkGB_7KkAgNhyqxz7Aj_AeIKJMH3XC59AUfgIUmr-myPKGVl9DLUkIguFGsQoDDPz7TCgNP3XMDIQVQxLxpkoWEzgD3Ymb9PdjEYPyugPMt9d_8otclCEBPVqORc0Zrny0ueGFFOiaPh95W0GpCNnne1fLH1WYLWY0L3rLmdfWMGKUCxijHN6isNfkXnN8kLLhq6z5euSPgVmHmQYqs2q1CBS2d3L3jLZ8AO8zOTmcokIyfDMqc1XiTjyzpJ0X_sX9NxwtGdF8BSId3uvUhdwdoYOVblXMosWLLvAyzyUokAhRxVvDek9uFmWuzvEOUL0RRlRb6XTQLOBG0x5kFeqK00-7i6R2nAXZD0Gt1UHZOWRcmvZDYR_WgKlQsASorry for the crazy long link

author: squadchannel
author_rank: Frequent Contributor
timestamp: December 22, 2024, 02:53:09 pm
content: Quote from: PA0PBZ on December 22, 2024, 02:42:04 pmhttps://www.datasheetarchive.com/pdf/download/scans/Scans-99/DSAIHSC000111478.pdf?h=4b47b1f493aacf8640d44f823b6bad4d%3Ac533d5545aa392e5c90f4794ac06133a902891e15bdba5869c8c399df509ba80de%3Ab4af1604bdab18e2ff41f99d121fb3f6Still long though.Google is the same, always annoyed by the long links that are generated for analytics.

author: hb9mfl
author_rank: Newbie
timestamp: December 22, 2024, 04:20:32 pm
content: Great!TNX Armin HB9MFL
intresting properties of directional coupler - Page 1
Forum section: electronics / rf-microwave

author: john23
author_rank: Frequent Contributor
timestamp: December 23, 2024, 07:25:40 pm
content: Hello , I heard two facts about directional couplers:1.if we take a directional coupler and send a signal from the output then the coupling port also will function as if if the input port2. if we send a signal from coupling port the it will be coupled to the input port ?are these facts correct?I want to use the following component and I am not sure if those properties will exist in it?Thanks.[URL unfurl="true"]https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/5864/FPC06882.pdf

author: Marsupilami
author_rank: Frequent Contributor
timestamp: December 24, 2024, 03:23:45 am
content: The listed statements are unclear, but based on my assumption on what you likely need, here we go:Directional couplerThree ports: 1: Input, 2: Output, 3: CoupledInput -> Output: Insertion Loss (S21)Input -> Coupled: Coupling Loss (S31)Output -> Input: Insertion Loss (S12)Output -> Coupled: Isolation (S32)Coupled -> Input: Coupling Loss (S13)Coupled -> Output: Isolation (S23)As you can see its 3x3 S-Parameter matrix is symmetrical:S12=S21=Insertion LossS13=S31=Coupling LossS23=S32=IsolationFPC06882This part however is NOT a directional coupler. It is called a resistive coupler, sometimes as restive tap or power tap.It is nothing more than a high valued resistor shunted from the main line to the coupled. The coupled port is not matched.Input -> Output: Insertion Loss (S21)Input -> Coupled: Coupling Loss (S31)Output -> Input: Insertion Loss (S12)Output -> Coupled: Coupling Loss (S32)Coupled -> Input: ?Coupled -> Output: ?These are undefined and while in the ballpark of the Coupling Loss, the ratio heavily depend on the load on the Input and the Output.S12=S21=Insertion LossS31=S32=Coupling LossS13=?S23=?*EDIT*As it has been pointed out, this last statement is technically incorrect. As a reciprocal device its S13=S31 and S23=S32.My point is that in a practical application this kind of part opposed to a directional coupler is often (but not necessarily) less useful as a signal insertion device due to its direct dependence on main line termination.There are valid use cases for both.*EDIT*HTH

author: EggertEnjoyer123
author_rank: Frequent Contributor
timestamp: December 25, 2024, 07:27:42 pm
content: Quote from: Marsupilami on December 24, 2024, 03:23:45 amIn a S parameter measurement all ports are assumed to be terminated in 50 ohms, so S13 = S31 (all passive networks except circulators are reciprocal) and S23 = S32.

author: ejeffrey
author_rank: Super Contributor
timestamp: December 26, 2024, 03:39:27 am
content: Quote from: Marsupilami on December 24, 2024, 03:23:45 amThe tap port can be and usually is matched with a shunt resistor. What distinguishes the resistive coupler from a directional coupler is that there is no isolation. That means the tap will see both the incident and reflected wave equally. A directional coupler (ideally) only couples the incident wave.
Sierra Philco 470a-500 Power Signal Source  - Page 1
Forum section: electronics / rf-microwave

author: macona
author_rank: Regular Contributor
timestamp: December 20, 2024, 07:54:02 am
content: I picked up this Sierra 470A-500 power signal source. It seems to work, I guess, to at least outputs RF and I checked with an external meter and load. It isn't quite what I was expecting inside. The knob moved something in a tuned cavity, I really dont know much about this old tech. Output is coupled on the side of the cavity and there is a knob that moves it in and out. The thing is 5 to 500mhz and up to 80W out. The scale on the wheel skips a range between roughly 50mhz and somewhere in the low hundreds. The thing is there is nothing to switch between these two scales. I really have no idea what is going on with this. I can only find a couple others on the internet and no manuals whatsoever.Anyone mess with one of these? I got it thinking it might be be usable for an inductively couple plasma cleaner. Paid $30 for it so no great loss.IMG_5875byJerry Biehler, on FlickrIMG_5874byJerry Biehler, on FlickrIMG_5872byJerry Biehler, on Flickr
ICOM 402 - No RF Out - Page 1
Forum section: electronics / rf-microwave

author: SteveWithnell
author_rank: Newbie
timestamp: December 18, 2024, 04:08:03 pm
content: I picked up one of these off eBay a while back and it's in excellent cosmetic condition. It all appears to work functionally, but while the RF out key down is clearly seen on the analyser, its a couple of mW at best.I'm assuming blown PA -How do I test that assumption and has anyone replaced the PA transistors on one of these?RegardsSteve

author: geggi1
author_rank: Frequent Contributor
timestamp: December 18, 2024, 07:41:17 pm
content: If it is the old IC-402 you will be able to find the schematics several places online.Because this is a SSB rig you will not any rf on key down without modulation.
where to buy non PUR litz wire - Page 1
Forum section: electronics / rf-microwave

author: coppercone2
author_rank: Super Contributor
timestamp: December 15, 2024, 06:01:28 am
content: Where can you buy some non solderable litz wire?Something without Polyurethane. They like to use it because its pliable and solderable.Is there anyone selling more robust stuff in smaller quantities? The stuff you need to strip with base.Or just like a really tough enamel. I am not looking for super flexible stuff.
Transceiver RX / TX 8v switching help? - Page 1
Forum section: electronics / rf-microwave

author: Crambone
author_rank: Frequent Contributor
timestamp: December 09, 2024, 12:37:34 am
content: Ok here is a schematic and I’m hoping someone can explain to me how the RX / TX switching works as I’m having a no receive issue and believe it’s tied to the 8v system. My reason is when I connect to a squelch test point and go from 0-10 on the knob the voltage stays at 8vdc and should go from 0 (no squelch) to 8vdc (full squelch)

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: December 09, 2024, 01:15:09 am
content: Is there any S meter action when you put in a signal? Do you have Tx?If there is any S meter movement you have Rx but the squelch circuit is at fault

author: Crambone
author_rank: Frequent Contributor
timestamp: December 09, 2024, 02:10:23 am
content: No RX when signal put in and I do have transmit but it is low.No receive on all modes & when connected to load with no signal injected on USB Signal Meter goes to S9, LSB S3, CW S4. AM FM & PA S0Unit is only putting out dead key 2.5w and 28w modulated on AM, USB & LSB 26w modulated. That’s with amp in line, when I pull the J22 amp key I’m seeing 0.3w dead key and 3.5w modulated.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: December 09, 2024, 02:57:13 pm
content: I would start by checking the 8+ volts at the connectors on the board wherever you see 8V on the schematic, and see if one is wrong.You can also check 8 volts at the mic pin 5 with no mic plugged in. should be 0 volts with mic plugged in on Rx.Check the 8 V D/P at the connectors for change when you push PTT.On these radios I have found that the switching transistors RN 1403 are frequent problems, sometimes the Rx Tx light will be orange indicating a switching problem. Also check the big transistor volt regulator. Hopefully you will find one voltage that is wrong that will lead you to the problem.There is also the chance that the CPU unit is not working correctly.Sometimes the Weather Radio tries to take over the Rx.

author: Mark19960
author_rank: Regular Contributor
timestamp: December 12, 2024, 07:21:39 pm
content: Q47/Q48 is the RX switch. Q49 is the TX switch.If you look at D64 you will notice its a zener and D65 is a small signal diode.One of the opamps in IC6 is operating as a comparator.Start looking in that area. There are some things that inhibit switching like PLL out of lock, etc.
DIY RF Noise Bridge: Anyone use an SMD RF transformer with success? - Page 1
Forum section: electronics / rf-microwave

author: abitofhelp
author_rank: Contributor
timestamp: December 10, 2024, 07:11:02 am
content: Hello,I am building an RF noise bridge (DC-100MHz (200-400, even better) to replace one that failed in my Palomar Engineers antenna tuner. I am using SMD components and have completed the implementation of the noise generator.Now, I am designing the transformer stage between the generator and the Wheatstone bridge. I was planning on using an FT50-43 ferrite toroid, but I was curious whether any SMD RF transformers could be used. I found that several companies make SMD RF transformers, such as those I've listed below, but I don't know whether they would be good solutions for an RF noise bridge. There is no transmitting involved, so the requirements are simpler.https://www.minicircuits.com/pdfs/TCM1-382WX+.pdfhttps://productfinder.pulseelectronics.com/api/open/part-attachments/datasheet/cx2041nlt>>> Assuming the correct taps on the SMD RF transformer, would one be a good substitute for a wrapped ferrite toroid?MikeK2MM

author: EggertEnjoyer123
author_rank: Frequent Contributor
timestamp: December 11, 2024, 04:31:40 am
content: Make sure you don't need a center tap before buying the Mini Circuits one.A lot of the designs online have a center tapped transformer in the schematic.

author: abitofhelp
author_rank: Contributor
timestamp: December 11, 2024, 05:14:08 am
content: Good catch, @EggertEnjoyer123! Indeed, I do need that center tap.

author: abitofhelp
author_rank: Contributor
timestamp: December 12, 2024, 12:15:05 am
content: I am very interested in using a Mini-Circuits TC1-1T+ RF Transformer in my RF Noise Bridge. Based on the specifications, it seems like it would work well, but I am not a professional electrical engineer. I've attached an image showing the circuit and would appreciate your comments or suggestions about using the TC1-1T+.https://www.minicircuits.com/WebStore/dashboard.html?model=TC1-1T%2BThank you for your help!Mike
How To Match RF Power Amp? - Page 1
Forum section: electronics / rf-microwave

author: that_rf_guy
author_rank: Newbie
timestamp: November 22, 2024, 06:34:17 pm
content: Hi all,I'm in a bit of a pickle wrapping my head around the matching of a CGHV59070F power amp (link here). The manufacturer states that it is "internally matched", but given the price tag I'd like to verify that this means it should see 50 Ohms on the input and output. The example PCB layout on page 5 of the datasheet (link here) seems to show a stepped transmission line on the output of the package. There are also a number of small rectangular pads on the side of the stepped transmission line - if anyone knows what their purpose is, please chime in, I've been stumped with them as well for some time!

author: David Hess
author_rank: Super Contributor
timestamp: November 22, 2024, 09:21:39 pm
content: At high power and low voltage, the low output impedance would be difficult to match externally, so internal matching raises the output impedance, but not all the way to 50 ohms in this case so an external matching network is still required for maximum output power.

author: that_rf_guy
author_rank: Newbie
timestamp: December 03, 2024, 05:41:47 pm
content: Thank you David, that was what I assumed given the topology shown on the example circuit. However MACOM has gotten back to me and claims that they do not supply load-pull data as it is in fact internally matched to 50 Ohms. Curious as to how they pulled that off inside.

author: mtwieg
author_rank: Frequent Contributor
timestamp: December 04, 2024, 09:51:34 pm
content: I looked at the S2P file, at ~5GHz |S11| is around -6dB, |S22| is around -3dB, which is fairly good. But that might be based on their reference layout which has some necessary features in it to improve the matching.
Plastic Smell Cleanup Question - Old HP Gear - Page 1
Forum section: electronics / rf-microwave

author: QuasiCoherent
author_rank: Newbie
timestamp: December 02, 2024, 06:32:20 am
content: Hello all,I have (very fortunately) come into possession of some older 20GHz HP gear, an HP 8720C and HP8431A. Thankfully, both start up and work fine (expected output power, frequency, spectral purity, stable over time and match other known references I have). However, both suffer from a (familiar from using other HP gear in the academic environment) issue; they seem to be outgassing some sort of sharp plastic smell when turned on, kind of like rubber. This is particularly apparent on the HP 8720C; I would like to remedy this so I can use them at home safely, but I am hesitant to open an instrument as potentially sensitive as the 8720C unless necessary. Perhaps others have encountered this, and have advice? (common culprits or remedies). I am mainly worried about disturbing any ovenized oscillators that may be generating considerable heat.Thanks in advance.

author: coppercone2
author_rank: Super Contributor
timestamp: December 02, 2024, 10:34:17 pm
content: I tried a whole bunch of stuff on a old probe and I ended up selling it. LEft it out in the heat, ultrasonic cleaning, scrubbing, etcThe first thing that comes to mind for some reason is oxy clean

author: CaptDon
author_rank: Super Contributor
timestamp: December 04, 2024, 01:07:18 am
content: How about that horrible chemical smell associated with Chinese rubber like the shoe isle at Walmart or the entire Harbor Freight store? Wow, hope your HP gear isn't that bad!! Makes me wonder about sex with a Chinese rubber condom? Probably have to make love outdoors.
pcb loop chip antenna impedance confusion - Page 1
Forum section: electronics / rf-microwave

author: electronx
author_rank: Regular Contributor
timestamp: December 03, 2024, 08:05:28 am
content: 1001312 I have a 50 ohm 2485MHz chip antenna.I have to adjust the s11 parameters for the antenna to work at the frequency I want, yes, everything seems fine in this case.However, when I measure the z11 parameters from the antenna transeivcer feed point, I see a value like 36 ohms.Shouldn't I see 50 ohms here?I see 36 ohm impedance at 2.441 ghz, it provides s11 parameters but in this case maximum power transfer cannot be done according to maximum power theory.in this case when I increase the impedance to 50 ohms, s11 parameters shift towards 2.7 ghz.Can I keep the s11 parameters at 2.441 ghz center frequency with the correct values ​​and pull the feed impedance to 50 ohms?

author: electronx
author_rank: Regular Contributor
timestamp: December 03, 2024, 06:23:11 pm
content: My mistake, I looked in db.it has to be normalized value for z parameters
Micro Photonix Integration OC192 amplifier - datasheet wanted - Page 1
Forum section: electronics / rf-microwave

author: Aiy
author_rank: Regular Contributor
timestamp: November 28, 2024, 07:55:34 pm
content: Hello Everyone,I have an Micro Photonix Integration OC192 amplifier on my desk.I know it works from 10M up to 18-19G, but not much else...Since that company is no longer in business and the internet wayback machine does not have the datasheet, I was wondering if someone on the forum has a copy? I'll post a picture of the amplifier in case it helps.Best regards,

author: Aiy
author_rank: Regular Contributor
timestamp: December 01, 2024, 05:12:09 pm
content: Uploaded a photo of the amplifier, incase anybody recognizes itBest regards,
Must Ground Plane Connect Directly Under Antenna? - Page 1
Forum section: electronics / rf-microwave

author: johnywhy
author_rank: Contributor
timestamp: December 09, 2024, 09:10:29 pm
content: In this proximity coupled antenna, is it necessary to solder a ground connection directly beneath the antenna? Or can the ground plane be connected to ground point elsewhere on the ground plane, far away from the antenna?Assume the patch substrate and ground plane are several wavelengths larger than the patch.

author: szoftveres
author_rank: Regular Contributor
timestamp: December 10, 2024, 01:59:06 am
content: If I were to feed this antenna with e.g. a coax line, I'd solder its outer shield to the ground plane right where the stripline starts at the edge of the substrate..
Does highly sensitive radio receivers encounters less fading - Page 1
Forum section: electronics / rf-microwave

author: prabhatkarpe4
author_rank: Contributor
timestamp: November 25, 2024, 10:44:55 am
content: I need to know whether the radio receivers that are highly sensitive, like having sensitivity less than 0.0224 micro volts for AM reception, encounter less fading than the others with less sensitivity?Which specification of a radio receiver is responsible for mitigating fading?

author: tggzzz
author_rank: Super Contributor
timestamp: November 25, 2024, 11:09:35 am
content: Quote from: prabhatkarpe4 on November 25, 2024, 10:44:55 amSee responses to your previous posts, e.g.https://www.eevblog.com/forum/rf-microwave/is-there-any-analog-radio-receiver-that-prevents-fading-of-the-sw-reception/msg5710871/#msg5710871

author: rf-fil
author_rank: Regular Contributor
timestamp: November 26, 2024, 03:46:02 am
content: Is this poster an AI?

author: coppercone2
author_rank: Super Contributor
timestamp: November 26, 2024, 03:47:20 am
content: i feel like i might be playing descent

author: tggzzz
author_rank: Super Contributor
timestamp: November 26, 2024, 09:22:10 am
content: Quote from: rf-fil on November 26, 2024, 03:46:02 amAI is difficult to distinguish from NS

author: LaserSteve
author_rank: Super Contributor
timestamp: November 26, 2024, 09:15:15 pm
content: May I suggest this book:https://www.google.com/imgres?q=experimental%20methods%20in%20RF%20design&imgurl=https%3A%2F%2Fm.media-amazon.com%2Fimages%2FI%2FB1HooIgY0zS._AC_UF350%2C350_QL50_.jpg&imgrefurl=https%3A%2F%2Fwww.amazon.com%2FExperimental-Methods-Design-ARRL-Inc%2Fdp%2F087259923X&docid=GmPOCkZujJ4fmM&tbnid=1GAq1bTXTTwGXM&vet=12ahUKEwi75pqn9fqJAxX8lYkEHb1mLmAQM3oECBwQAA..i&w=252&h=350&hcb=2&ved=2ahUKEwi75pqn9fqJAxX8lYkEHb1mLmAQM3oECBwQAA"Experimental Methods in RF Design"By Hayward and Campbell. One is a Master Engineer, the Other is a Professor in Electrical and RF Engineering. They both like to A. Teach, B. Use their hands and build things.I open my copy frequently.Steve

author: CaptDon
author_rank: Super Contributor
timestamp: November 27, 2024, 12:52:41 am
content: Read some books on the subject. You ask the same basic questions over and over in all the different sub-forums.

author: gnif
author_rank: Unknown
timestamp: November 27, 2024, 01:31:11 am
content: Locked... again.User banned
Reading a TPMS sensor with a microcontroller - Page 1
Forum section: electronics / rf-microwave

author: crispus
author_rank: Regular Contributor
timestamp: November 22, 2024, 12:31:30 pm
content: Hello,I have a few TPMS sensors I can read usingrtl_433and a SDR. I would like to be able to read it using a microcontroller and a 433 MHz chip (i.e. RFM69, CC1101, etc), but not sure how to translate the 433 configuration:Code:r_device const tpms_bmw = {.name = "BMW Gen4-Gen5 TPMS and Audi TPMS Pressure Alert, multi-brand HUF/Beru, Continental, Schrader/Sensata, Audi",.modulation = FSK_PULSE_PCM, ///< FSK Modulation, Non-Return-to-Zero coding, Pulse = 1, No pulse = 0..short_width = 25,.long_width = 25,.reset_limit = 100,.decode_fn = &tpms_bmw_decode,.fields = output_fields,};into 433 chip's ones (i.e. bandwidth, baud rate, etc).Does anyone have any pointers? Thank you!

author: voltsandjolts
author_rank: Unknown
timestamp: November 22, 2024, 01:26:16 pm
content: You might find some examples in theradioheadlibrary. It supports the RFM69 and haspredefined configsavailable. At least one of those configs is anFSK examplefor wireless comms withTI CC110L.
NanoVNA Firmware - Dislord - Where to find? - Page 1
Forum section: electronics / rf-microwave

author: nealix
author_rank: Regular Contributor
timestamp: November 23, 2024, 05:34:09 pm
content: I wanted to try Dislord's firmware on my NanoVNA V2 Plus4 so that I can study his Windows 10 NanoVNA-App program.Google only found a facebook group that had version 1.3.25 from June 2024. But I see others posts that talk aboutmore recent versions, such as 1.3.31.If google does not find locations for download and information, where are people learning about the features and thelatest versions for the Dislord firmware?Thanks,Neal

author: wasedadoc
author_rank: Super Contributor
timestamp: November 23, 2024, 09:08:29 pm
content: https://github.com/DiSlord

author: nealix
author_rank: Regular Contributor
timestamp: November 24, 2024, 12:29:17 am
content: @wasedadoc:Thanks for trying to help, but the link to Dislord's GIT page shows no updates for 3 years.And there is no compiled firmware bin files there.Yet I have seen forum discussions of v1.3.31 firmware from very recently this year, but withno information about where people are finding it and downloading it.Is there a different site, one that does not show up in google searches, that has the newerfirmware versions?Thanks,Neal

author: EggertEnjoyer123
author_rank: Frequent Contributor
timestamp: November 24, 2024, 07:41:48 am
content: https://github.com/DiSlord/NanoVNA-D/releases

author: cyp_eev
author_rank: Contributor
timestamp: November 24, 2024, 10:39:27 am
content: For new beta releases you could also try Nanovna-Beta-Test on groups.io

author: joeqsmith
author_rank: Super Contributor
timestamp: November 24, 2024, 04:52:19 pm
content: QuoteOnce the LiteVNA was released, I stopped doing anything with the V2Plus4 because the firmware was lacking. Read the following two posts from Dislord:https://www.eevblog.com/forum/rf-microwave/nanovna-custom-software/msg4015222/#msg4015222https://www.eevblog.com/forum/rf-microwave/nanovna-custom-software/msg4020526/#msg4020526I attempted to upgrade mine. Dislord provided details on how to back it up before you reprogram it.https://www.eevblog.com/forum/rf-microwave/nanovna-custom-software/msg4020760/#msg4020760https://www.eevblog.com/forum/rf-microwave/nanovna-custom-software/msg4021015/#msg4021015****Quote from: EggertEnjoyer123 on November 24, 2024, 07:41:48 amThose are for the older hardware, not the V2Plus4 OP is asking about.

author: Ringmodulator
author_rank: Regular Contributor
timestamp: November 29, 2024, 05:21:11 pm
content: Hi,rename the file and delete the ".txt" part in the filename.The file with the "SD" is for units, that have the sd card slot.Chris
RFM95W output power - Page 1
Forum section: electronics / rf-microwave

author: LogicalDave
author_rank: Regular Contributor
timestamp: November 20, 2024, 07:36:36 pm
content: I'm using a HopeRF RFM95W RF module in some prototypes and the maximum transmit power I've been able to get is roughly +18.18dBm at 915MHz (see attached photo showing a CW transmission with the radio configured for +20dBm). This may be reasonable since the maximum transmit power of the transceiver's PA is +20dBm and there is some IL associated with the module's RF switch and harmonic filter. However I may also be messing things up with the DC power filtering (or something else).The registers associated with power level are configured as follows: RegPaConfig=0x8F, RegOcp=0x2F, RegPaDac=0x87Has anyone been able to get more RF power out of these modules?

author: szoftveres
author_rank: Regular Contributor
timestamp: November 20, 2024, 09:38:46 pm
content: Quote from: LogicalDave on November 20, 2024, 07:36:36 pmOn top of that, I''m assuming there's also an RF cable between the spectrum analyzer and this module. The PA max. output is a function of Vdd and process tolerances, and the Siglent SA isn't an ethalon-grade instrument either.1.8dB difference (or loss) doesn't seem unreasonable at all to me.

author: LogicalDave
author_rank: Regular Contributor
timestamp: November 21, 2024, 08:49:28 pm
content: It certainly could be an accumulation of loss and error.The SA (Siglent SSA3021X) is newish and in calibration; the total level measurement uncertainty spec is less than 0.7dB. I have better SAs, but I have tested this one with a calibrated, leveled signal generator and it is *much* better than 0.7dB level accuracy that at 1GHz.The vendor claims +20dBm out of the module; I seriously doubt that because that's the rated transmit power from the radio (before switch and filtering). I would have believed up to 1dB of total IL for the switch+filtering that are built into the module plus the cable, but 2dB seemed excessive which is why I asked what others are seeing.
YTO swap (5086-7903 -> 5086-7781) - Page 1
Forum section: electronics / rf-microwave

author: Dobby
author_rank: Newbie
timestamp: November 21, 2024, 07:01:13 pm
content: My HP 8594E spectrum analyzer died - its the YIG Oscillator.I want to swap its (dead) YTO 5086-7903 out for a different (alive) YTO I have 5086-7781.Does anyone know of any notable differences between these devices that would be problematic , eg range, output power ?

author: DaJMasta
author_rank: Super Contributor
timestamp: November 21, 2024, 07:34:31 pm
content: I don't know the parts specifically, but are they otherwise unmarked? A lot of yigs in analyzers are made by another company and have basic info and a more searchable part number in them.In any case, I sort of doubt it, as there seem to be a lot of variations and different frequency plans even within similar instrument vintages or families - possible, sure, but unlikely. That said, what's wrong with it? Big power circuitry can fail and the amplifier on the output can fail and both can be fixed without replacing the yig.

author: Dobby
author_rank: Newbie
timestamp: November 22, 2024, 06:31:39 pm
content: It worked, and i don't see any (major) issues.

author: coppercone2
author_rank: Super Contributor
timestamp: November 23, 2024, 06:23:52 pm
content: just wait until you run into a high frequency overload on the coil and end up in a mirror universeI heard the dave jones with a goatee charges a registration fee
Is there any analog radio receiver that prevents fading of the SW reception? - Page 1
Forum section: electronics / rf-microwave

author: prabhatkarpe4
author_rank: Contributor
timestamp: November 12, 2024, 11:03:21 am
content: I have been using AM radio receivers from a long time but I have encountered fading many times while listening to the SW reception. However, I have noticed that the most expensive radio receivers from Tecsun, Degen, and Sony minimize fading up to certain extent. So, why does it happen? Is it something to do with the AGC or the sensitivity?I would also like to know whether an AM radio that uses vacuum tubes instead of transistors, can have a better reception quality?

author: A.Z.
author_rank: Super Contributor
timestamp: November 12, 2024, 11:35:01 am
content: AGAIN ?https://www.eevblog.com/forum/rf-microwave/does-a-diversity-radio-receiver-really-mitigate-fading/do you UNDERSTAND what a discussions forum is and HOW to correctly and politely use it ?

author: mr ed
author_rank: Regular Contributor
timestamp: November 13, 2024, 12:01:30 am
content: Short wave band fading is an atmospheric (rf skip) phenomenon. You would need antennas many miles apart to mitigate this fading type. The AGC is just an automatic 'volume' control. As a student of any age there is a lot to understand. Many fading types, many frequencies/wavelengths and 100 years of technology to review. It will take time.

author: gnif
author_rank: Unknown
timestamp: November 19, 2024, 03:23:35 am
content: Locked, duplicate of:https://www.eevblog.com/forum/rf-microwave/does-a-diversity-radio-receiver-really-mitigate-fading/
Would you like to ask whether the nfc card can be simulated? - Page 1
Forum section: electronics / rf-microwave

author: tianYI119
author_rank: Newbie
timestamp: November 15, 2024, 12:06:18 pm
content: Hi, I just signed up.I have a question, I don't know if it is right to post here?If not, manage the removal. thank youIn my work, I need to use the nfc function of the terminal device to swipe the card to the specified location.Because sometimes it's raining or too cold to go outSo let me ask:There's no way we can simulate that card. Credit cards can be swiped in the house?thank youWould you like to ask can simulate nfc card?

author: A.Z.
author_rank: Super Contributor
timestamp: November 15, 2024, 02:43:28 pm
content: I am sorry, it does not compute, enter more data or rephrase your question, thank you.
Low frequency modulation in high frequency DDS generated signal - Page 1
Forum section: electronics / rf-microwave

author: Quant
author_rank: Newbie
timestamp: November 12, 2024, 03:28:55 am
content: Hi all,I've been using an arbitrary waveform generator for one of my projects, and specifically, I'm using a DDS option on that AWG (the waveform generator is an M4i6621x8 from Spectrum Instrumentation). Essentially, I'm sending asking the DDS to output a sum of RF sine waves, all of them being on the order of 10s of MHz, with a delta in frequency of at least 1Mhz. However, on the output signal, if I ask for a certain amount of sin waves (usually 5 or more), I start observing a modulation of the amplitude of frequency a few hundred mHz (orders of magnitude away from my input frequencies). The modulation is sinusoidal (see oscilloscope screenshot ).My questions are : why does this happen and how can I remove this feature ? I would expect some MHz beating because of how sum of sine functions work, but definitely not mHz.Some additional information :-the frequency resolution of the DDS is about 290 mHz, so this value seems to fit with the observed beating, but I fail to see how this could be related to the issue.-I didn't notice such beating when using less than 5 frequencies as an input.-I am using a ZHL-1-2W+ power amplifier at the output of the AWG, which is then connected to an acousto optic deflector (a device that diffracts a laser beam according to input frequencies). The amplitude modulation becomes visible on camera based on the intensity of the diffracted beams (attached is an occurrence of the beating measured on camera)Any input would be greatly appreciated. Thanks in advance.

author: jonpaul
author_rank: Super Contributor
timestamp: November 12, 2024, 08:56:22 am
content: Bonjour cher Monsieur,Je vous suggère de poser le problème à l'assistance du fabricant :https://spectrum-instrumentation.com/support/support_rma.phpJe chercherais également de l'aide dans un forum plus spécifique, par exemple sur les DSP.Bonne chance,JonI suggest you pose the problem to the manufacturer support:https://spectrum-instrumentation.com/support/support_rma.phpI would also seek assistance at a more specific forum eg on DSPGood luck,Jon_____

author: Quant
author_rank: Newbie
timestamp: November 13, 2024, 01:21:24 am
content: Hi Jon,Thank you for your reply. I've already contacted the support team but unfortunately the conversation didn't solve my problem. They were the ones who suggested that the modulation could come from the 290mHz frequency step. For now I'll try asking on a DSP forum as you suggested (thank you for the tip).Best regards,Quant
AOR ABD128 vs RTL-SDR FM Band Stop VNA test - Page 1
Forum section: electronics / rf-microwave

author: veedub565
author_rank: Frequent Contributor
timestamp: November 01, 2024, 07:26:43 pm
content: I have both AOR ABD128 and RTL-SDR FM Bandstop filters. Out of interest I did a sweep on the VNA this week, and thought the results might be interesting to anyone considering buying one. I've got a MiniCircuits one on order and I'll sweep that one too when get it.

author: veedub565
author_rank: Frequent Contributor
timestamp: November 08, 2024, 07:40:03 pm
content: I received the Mini-Circuits ZBSF-95-N+ filter today. I've run it on a different VNA this time and overlayed the RTL-SDR filter resultsMini-Circuits in GreenRTL-SDR in BlueI'm a bit underwhelmed with the performance of the Mini-Circuits filter, especially considering it's cost over over the RTL-SDR filter. It's attenuation in the broadcast band isn't as good, although it does have less insertion loss and less attenuation at the start of the airband.Unless you want to listen to the lower end of the airband I'd have to say the RTL-SDR filter is the best bet, certainly best bang per buck

author: veedub565
author_rank: Frequent Contributor
timestamp: November 08, 2024, 08:06:37 pm
content: The Mini-Circuits on is well made though, I'll give it that. Not £100 worth better made, but still.

author: radiolistener
author_rank: Super Contributor
timestamp: November 10, 2024, 11:30:09 pm
content: From my experiments, bandpass filter is much better. I have no benefit from RTLSDR FM reject filter - the result is the same as without the filter, but it attenuates a little VHF band.In contrast when I use bandpass filter I see noticeable noise floor drop down and less spurs.