SDR, RTL, NWT4000, HackRF... What? - Page 1
Forum section: electronics / rf-microwave

author: masterx81
author_rank: Frequent Contributor
timestamp: December 19, 2020, 09:53:57 am
content: Hi! I'm searching a decent (or at least the best bung/buck) spectrum analyzer in the cheapest range... I don't need to project antennas or similar (in that case nanoVNA will be the answer). I need only sometimes to check if a trasmitter is working and check it's frequencies (in the 2.4ghz range), and maybe analyze the DVB-T2 frequencies/power levels .I've seen a lot of projects for this scope under the 200usd, but i can't choose what's better.The sdr-rtl seem to work only up to 1.7ghz, and from what i've read are the best thing for work in the dvb-t range (and are quite cheap).Remain uncovered the 2.4ghz...I've seen the nwt variants, and other projects (like hackrf that have only 8bit resolution), i've read a lot but can't decide...Someone have some suggestions?Thanks!

author: radiolistener
author_rank: Super Contributor
timestamp: December 19, 2020, 10:46:09 am
content: I bought this one:https://www.aliexpress.com/item/33032121416.htmlAt a glance it has some little input impedance issue, needs to do a little modding.Probably remove 50 Ohm resistor between RF IN connector and mixer should fix it.But such mod will require about 10 dB attenuator between RF OUT and RF IN. Because RF OUT has about -5...0 dBm. This is too much for IAM-81008 mixer.I didn't tried yet such modding.According to my measurements, actual dynamic range is about 50 dB up to 1.5 GHz and about 30-40 dB up to 4.4 GHz.You can see picture which shows result taken for RF-IN=RF-OUT and RF-IN/RF-OUT loaded with 50 Ohm dummy loads.The first picture is math correction after calibration with 10 and 40 dB attenuators.And the second picture is RAW ADC data taken for the same measurement.As you can see from RAW ADC data, there is some RF leak at about 2.7 - 3.3 GHz range. At a glance the root of cause of this RF leak is ground plane layout. Because it is changing when you touch ground on SMA connectors.When it is used in spectrum analyzer mode, it's noise floor is about -47 dBm. So, it needs LNA amplifier in order to see low power signals.The third picture is a spectrum of GSM phone during call received onRHD-771antenna from 30 cm distance from the phone.And the fourth picture is a spectrum of WiFi router taken with the same RHD-771 antenna placed between router antennas at several centimeters distance.

author: masterx81
author_rank: Frequent Contributor
timestamp: December 19, 2020, 11:00:11 am
content: Whoa, so high noise floor... This seem a clone of the nwt4000, from what i've seen the "genuine" nwt4000 will perform bit better (and costs 4x/5x more).And also, seem that the genuine nwt4000 has no aluminium case, while some other nwt4000 (clones of the clones of the...) does have it.Thanks!

author: radiolistener
author_rank: Super Contributor
timestamp: December 19, 2020, 11:08:02 am
content: I bought it primary as a signal source for 33-4400 MHz range. But it also works good as a simple spectrum analyzer and bode plot.For example, here is my hand made BPF tuned for 145.3 MHz measured with this LTDZ device:

author: MikeLud
author_rank: Regular Contributor
timestamp: December 19, 2020, 03:39:05 pm
content: radiolistenerI also just bought one, which software are you using. Occasionally when running a 0 db sweep I get the below spikes. I was also looking to do the filter mod and found the newer versions of the LTDZ has it already

author: RoGeorge
author_rank: Super Contributor
timestamp: December 19, 2020, 05:27:27 pm
content: I have a PlutoSDR, designed by Analog Devices as a learning/demo for their 6GHz transceiver (on the pge sais 3GHz but can be unlocked to 6GHz for both Rx and Tx if you don't care much about accuracy).https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/adalm-pluto.htmlNice toy w a 6GHZ ADI transceiver, 12 bits ADC, a dual core Zynq FPGA, open source, runs Linux, has support for Matlab, GNU Radio, etc.There are some applications like SATSAGEN that can make a PlutoSDR act as a very basic spectrum analyzer or generator upto 6GHz:https://www.eevblog.com/forum/rf-microwave/adalm-pluto-as-simple-spectrum-analyzerw-tracking/http://www.albfer.com/en/2020/10/11/satsagen-0-4/If you want it for learning SDR, too, there is a free book from ADI and some uni classes, too:https://www.analog.com/en/education/education-library/software-defined-radio-for-engineers.htmlhttps://pysdr.org/

author: radiolistener
author_rank: Super Contributor
timestamp: December 19, 2020, 08:41:30 pm
content: Quote from: MikeLud on December 19, 2020, 03:39:05 pmI'm using my own software, it has better calibration, but limited functionsNote that 0 dB sweep leads to overload LTDZ input, because it has a little higher output than needed for mixer saturation.So, I recommend to use it through 10 dB attenuator.Recommended attenuators for calibration are 10 dB and 40 dB.I attached current version of my software for LTDZ.If possible please run it on your LTDZ device and give me screenshot with ADC output for the following cases:- RF-IN connected to RF-OUT- RF-IN connected to RF-OUT through attenuator 10 dB- RF-IN loaded with 50 Ohm dummy load and RF-OUT loaded with 50 Ohm dummy loadIf you don't have dummy load, just leave both connectors open for third test.Use the following sweep parameters:- start freq: 35000000- stop freq: 4400000000- points: 9999I'm interesting if there is a difference in hardware performance for different LTDZ instance.===========Some instructions:1) unzip and run2) Select proper COM port at the top of window and click "Connect" button3) Select "ADC" for Mode\Data combo box4) Press Sweep buttonfor calibration:1) press button on LTDZ to enable tracking generator2) press "Calibrate" button3) connect RF-IN to RF-OUT through 10 dB attenuator and press OK4) connect RF-IN to RF-OUT through 40 dB attenuator and press OK5) press Yes to save calibration (or no to not save, in such case calibration will remain in memory, but not be overwritten on the disk)6) select Mode\Data = Magnitude and press Sweep to check the calibrationNotes:- 9999 points (maximum for LTDZ) is recommended for calibration- LTDZ has min frequency 33 MHz and max frequency 4400 MHz- you can use your own values for attenuators in calibration procedure, just enter it's value below Calibrate button- offset field can be used to add some offset in dB on the chart- calibration file is saved to the file _refLogA.xml, if such file exists it will be loaded at startup. Otherwise it uses default values.- calibration file consists of two datasets with raw ADC data in hex format with comma delimiter, taken for two attenuators.- md5: CFF3BF1C63067D02F4EFB5553B11F39D

author: masterx81
author_rank: Frequent Contributor
timestamp: December 20, 2020, 01:01:41 am
content: Quote from: RoGeorge on December 19, 2020, 05:27:27 pmInteresting device. The other sdr devices that i've seen arrive at only 2ghz (airspy 1.7, sdrplay 2.0, seem that most of them are derived from dvb-t systems).But i think that the use of plutosdr is more indicated for a more rf instructed person than me 😅😅

author: MikeLud
author_rank: Regular Contributor
timestamp: December 20, 2020, 01:25:50 am
content: radiolistenerThanks for the software. I ran the tests, the descriptions for each test is in the file name. I ran all of the tests uncalibrated.To see what is happening when I get those spikes I scoped the ADC and RF_OUT and what I found out is when the spike occurs there is no signal coming out of the RF_OUT. I am thinking the Firmware I have V1.19 has a bug with the SPI timing. What version firmware does your LTDZ have.

author: radiolistener
author_rank: Super Contributor
timestamp: December 20, 2020, 10:49:58 am
content: Quote from: MikeLud on December 20, 2020, 01:25:50 amThanks. Calibration doesn't affects ADC chart results, because ADC chart shows RAW ADC data taken from LTDZ.There is definitely some difference between our devices. What I found:- through (direct IN=OUT) on our LTDZ produce the same ADC value 460- isolation (IN=load and OUT=load) produce a little different level. On my LTDZ ADC value is 89 vs about 65 on your. May be this is due to different dummy load?- my LTDZ don't have any drops on 108 MHz. I can run a lot of sweeps and it's pretty stable. See screenshot from 35 to 200 MHz.- your LTDZ has definitely higher RF leak between IN and OUT above 760 MHz (isolation screenshot). My one has RF leak above 2 GHz.- your LTDZ has more flat response for through connection. My one has significant drops above 2.63 MHzI'm not sure what is the root of cause for these difference.May be this is due to different component quality or different firmware.By the way, did you clean your PCB from flux? I clean it with ethanolDo you have installed 50 Ohm resistor on the ground at RF in connector (after capacitor)?Quote from: MikeLud on December 20, 2020, 01:25:50 amI don't have such drops. What is the frequency? 108 MHz?Quote from: MikeLud on December 20, 2020, 01:25:50 amI don't know. My LTDZ reports firmware version FW:1.19:V10 (Version: 77, Variant: 0a).But it doesn't means that our firmware is really identical. Needs more deep check.I will try to read frimware from my LTDZ and will report the results later.What I found during debugging my software is that my LTDZ firmware has a bug for a sweep with no delay. If I send command for a sweep with delay 0 it just hungs and needs to power off to reset. This is why I'm using sweep command with delay. It is used in SNASharp and WinNWT.So, there is possible some difference and bugs in firmware. Needs to learn it more deep.Also it's not clear why it use just 1/8 of ADC scale.STM32F103C8T6 has 12 bit ADC, so the resolution can be 8 times better by using full ADC scale.So, there is a perspective for improvement.

author: radiolistener
author_rank: Super Contributor
timestamp: December 20, 2020, 11:46:26 am
content: also measurement with different attenuators:- isolation = both connectors are open- through = IN connected to OUT through 32 cm RG174- 10 dB, 20 dB, 30 dB, 40 dB, 50 dB - IN connected to OUT through 32 cm RG174 and selected attenuator.I'm not sure if my attenuators working good above 2 GHz. I'm usepopular Chinese SMA attenuators for 6 GHz.

author: radiolistener
author_rank: Super Contributor
timestamp: December 20, 2020, 12:19:49 pm
content: LTDZ firmware is not protected. I can read it.Does anyone know if LTDZ firmware source is available on the internet?

author: DH1AKF_Wolfgang
author_rank: Contributor
timestamp: December 20, 2020, 02:14:23 pm
content: Also owner of a LTDZ analyzer, I now made the modification and soldered out the 50 Ohms resistor at the receiver port. Thanks for the hint.Now the result, measured with my NanoVNA V2:

author: radiolistener
author_rank: Super Contributor
timestamp: December 20, 2020, 02:51:47 pm
content: Quote from: DH1AKF_Wolfgang on December 20, 2020, 02:14:23 pmDo you know if LTDZ firmware source is available on the internet?I can read firmware from my LTDZ bought on aliexpress, you can see it in attachment. But I want source to make mods...I've found this github project for D6:https://github.com/joseluu/D6_firmwareIt looks that D6 firmware works with LTDZ, but it uses 12 bit ADC format and different NWT command style, so it is incompatible with existing LTDZ software, but it can work with WinNWT.I'm wondering where I can download source code for original LTDZ firmware?

author: DH1AKF_Wolfgang
author_rank: Contributor
timestamp: December 20, 2020, 05:18:00 pm
content: Hi Radiolistener,only this link collection I could find:http://www.kh-gps.de/analyzer.htm

author: MikeLud
author_rank: Regular Contributor
timestamp: December 21, 2020, 02:52:58 am
content: Quote from: radiolistener on December 20, 2020, 10:49:58 amI cleaned it with 90% alcoholQuote from: radiolistener on December 20, 2020, 10:49:58 amNo, I remove itQuote from: radiolistener on December 20, 2020, 10:49:58 amMy firmware reads the sameQuote from: radiolistener on December 20, 2020, 10:49:58 amThis is true, I did a memory dump of my firmware and compared with your dump and some parts were the same. So I took a chance and flashed your firmware. After flashing I tried your software with the newly flashed LTDZ and found it does not work. I then reflashed with the dump I did and now the board does not work at all with any software.Quote from: radiolistener on December 20, 2020, 02:51:47 pmAfter flashing your dump and my dump I figured what do I have to loss so I flashed Joseluu D6 firmware and now my board only works with SNASharphttp://alloza.eu/david/WordPress3/?p=1014also no more spikes. I tried several versions of WinNWT none of them worked worked with Joseluu D6 firmware

author: radiolistener
author_rank: Super Contributor
timestamp: December 21, 2020, 07:48:17 am
content: Quote from: MikeLud on December 21, 2020, 02:52:58 amThis is strange, the only reason why it cannot work is a firmware lock to STM32 serial number or something like that. I don't think that someone will do that. So I think most of all there is some mistake in reflashing procedure.I reflashed attached firmware after testing other firmware and it works again, the same as before.Did you used STM32 ST-LINK Utility for flashing?Can you give me your LTDZ STM32 dump?

author: MikeLud
author_rank: Regular Contributor
timestamp: December 21, 2020, 08:08:41 am
content: Quote from: radiolistener on December 21, 2020, 07:48:17 amYes, I used STM32 ST-LINK Utility for flashingIts 3:00am here in the US, I am going to get some sleep.

author: radiolistener
author_rank: Super Contributor
timestamp: December 21, 2020, 05:34:43 pm
content: Quote from: MikeLud on December 21, 2020, 08:08:41 amThis is not a full dump of STM32F103C8T6. It consists just first 4 kB.At a glance you're set wrong chip memory size in ST-LINK Utility. From the text file it reports checksum for[0x08000000:0x08001000] - this is 4 kB 0x1000but STM32F103C8T6 has 64 kB 0x10000 flash and some version may have even 128 kB 0x20000.So, this is the reason why it didn't works after reflashing. This is not a full memory dump.I compared it's content and it has different code from my one.It's a pity that you didn't make a complete dump of your version.Try to setup 0x10000 length and save memory dump, may be area above 0x1000 still remains your original firmware. If you didn't reflashed it with other firmware.After that you can reflash firmware that I posted above, it should work for you.But this is not the same firmware as you used out of the box.Just don't forgot to setup memory size 0x10000 (4 zero! not 3!)

author: MikeLud
author_rank: Regular Contributor
timestamp: December 22, 2020, 05:27:37 am
content: RadiolistenerThe original firmware is toast. I ordered a replacement from amazon and should have it by Thursday. I retested your firmware with your software and the RF In works somewhat (ADC numbers looks off) see attached 100Mhz -10 dBm sweep. The TG does not work at all (I did turn it on with the button)

author: Bicurico
author_rank: Super Contributor
timestamp: December 22, 2020, 10:50:51 am
content: May I recommend my blog:https://vma-satellite.blogspot.com/It basically discusses the original question of masterx81 and includes my own software for this range of devices, as well as some comparisons between models, etc.Bottom line is:NWT4000 is better than D6 is better than LTDZ.There are mods published for D6 to improve performance, I don't know of any mods for the LTDZ. It has basically a too high noise floor.I have looked into the firmware and I don't see any dramatic improvements being possible just by changing the FW (except what my software already does anyway).Regards,Vitor

author: HB9EVI
author_rank: Frequent Contributor
timestamp: December 22, 2020, 10:56:09 am
content: Quote from: Bicurico on December 22, 2020, 10:50:51 am+1the LTDZ is quite a shabby device; neither with LinNWT nor with SNASharp i got it properly working on my linux workstation; but what else can be expected for the price

author: Bicurico
author_rank: Super Contributor
timestamp: December 22, 2020, 11:09:13 am
content: It is quite poor a device, however it can still be useful for some applications.You get what you pay for!I think that it is a good device to start learning about spectrum analysers. If you break it, the loss is not so great.

author: radiolistener
author_rank: Super Contributor
timestamp: December 22, 2020, 11:30:14 am
content: Quote from: Bicurico on December 22, 2020, 10:50:51 amWhere I can find the source code of LTDZ firmware?

author: Bicurico
author_rank: Super Contributor
timestamp: December 22, 2020, 11:35:25 am
content: Sorry - I meant the D6 firmware!The whole SDk can be downloaded here:https://www.mediafire.com/file/j0kx8hndiieweak/Simple_Spectrum_Analyser.rar/fileNote that I am not hosting this file nor did I put it together. I just received this link when I bought my D6. I have nothing todo with its contents! Use at your own risk.Regards,Vitor

author: Bicurico
author_rank: Super Contributor
timestamp: December 22, 2020, 11:48:58 am
content: Adding this fine link:https://www.rudiswiki.de/wiki9/SpectrumAnalyzer_LTDZRegarding SDR, RTL, HackRF, ...These are different type of devices altogether. They are normally based on the RTL2832 chip and use Fast Fourrier Transformation (FFT) as opposed to swept spectrum analysts (SSA). They allow "realtime spectrum analysis" on the supported frequency bandwith, which varies from around 2MHz to 10MHz (or more) depending on the devices.This is nice for very fast spectrum refresh rate and, especially nice, because these devices allow DEMODULATION of the received signals!However, as a spectrum analyzer they offer less precision and no tracking generator (TG) functionality. You *could* implement your own, but I have not seen any sofwtare doing so.Then there is the problem that few devices/software support sweeping this FFT window over larger spans.There is the ADALM Pluto, a decent and cheap device, for which there is a software implementation of a spectrum analyser.Also, there is a nice spectrum analyser software for the HackRF.Overall, for the RF enthusiast, I would definitely recommend a HackRF One with the Portapack. Both can be bought at fairly cheap prices from China. Such a combination offers a lot of possibilities!Software-wise, GNU Radio is very interesting to explore, too.Take a look at this website for further RTL/SDR based devices:https://www.rtl-sdr.com/Regards,Vitor

author: MikeLud
author_rank: Regular Contributor
timestamp: December 22, 2020, 01:14:38 pm
content: VitorCan you add support for joseluu D6 firmware to your software?ThanksMike

author: Bicurico
author_rank: Super Contributor
timestamp: December 22, 2020, 01:22:10 pm
content: Doesn't it use the same protocol?Please test and tell me if/what adjustments are necessary.

author: DH1AKF_Wolfgang
author_rank: Contributor
timestamp: December 22, 2020, 01:41:41 pm
content: LTDZ:With the newest PC software from DL4JALdl4jal.deit works like a charm. On Windows 10 .But you have to read the manual, or, much better: the source code comments.

author: MikeLud
author_rank: Regular Contributor
timestamp: December 22, 2020, 01:53:54 pm
content: VitorThe default calibration is way out see attached 0dB and noise floor sweep. Also attached is SNASharp def file, Joseluu D6 firmware works with SNASharp. I am not sure if this helpsCode:<RawMode_0dB_Reference>2040</RawMode_0dB_Reference><VerticalResolutiondB>0.048</VerticalResolutiondB>ThanksMike

author: masterx81
author_rank: Frequent Contributor
timestamp: December 22, 2020, 03:46:14 pm
content: Quote from: Bicurico on December 22, 2020, 11:48:58 amThanks for your great answer!In the meantime i've already taken a genuine NWT4000 35/4400 (the one without housing, i need to do one by myself), so i try for sure your software (as from what i've read, is the better one to use with this hardware)!So you suggest the HackRF One also if it has only 8bit resolution?And, the same things that can be done with the Portapack can be done with a pc software? As for now i'm not too much interested in portability, but maybe i can add it in future if needed.

author: Bicurico
author_rank: Super Contributor
timestamp: December 22, 2020, 05:31:20 pm
content: The HackRF One is a great device works really well with common SDR software designed for RTL2832 devices.It works nice with GNU Radio, too. The advanced functionality is all done on the PC.The Portapack is basically a bigger case with buttons and a screen (a on new versions a built-in battery) that allows to use the HackRF One as if it was a portable radio device. If you are always using it at home, sitting on your PC, then you might not need it (it still works as a regular HackRF when fitted with Portapack).But in order to try some attacks or to receive some special transmissions (Air, Ship, etc.) it is nice to be portable.Regards,Vitor

author: masterx81
author_rank: Frequent Contributor
timestamp: December 23, 2020, 12:16:08 am
content: When arrive the nwt4000 i'll start playing with it. If i get a bit more involved in rf i'll try the hackrf+portapack - that seem can be found in the 2.8'' variant (H2 a bit more with 3.2") at 130eur shipped from aliexpress, with 5 antennas and tcxo upgrade. Quite cheap!

author: cdev
author_rank: Super Contributor
timestamp: December 23, 2020, 09:26:32 pm
content: How about building your own SDR with the ability to demodulate (not simply a spectrum analyzer) from a signal generator, a mixer, and a low noise amplifier and filters, and maybe some of those skyworks switch chips? The noise figure should be determined from the front end devices, is it possible to take a modular approach to build a receiver?is that practical?

author: Bicurico
author_rank: Super Contributor
timestamp: December 23, 2020, 09:43:31 pm
content: My guess is that it will end up more expensive than a HackRF or Pluto. Plus there is a ot of software development involved.Hardly a reasonable task unless you want to make money out of it.

author: radiolistener
author_rank: Super Contributor
timestamp: December 24, 2020, 12:06:18 am
content: Quote from: cdev on December 23, 2020, 09:26:32 pmyou can useHDSDRsoftware, it consists all popular demodulators (CW, AM, FM, SSB) and allows to pass a part of spectrum to another decoders. For example you can use DRM/DIG mode to pass the data to Dream decoder, which allows you to listen DRM stations.Actually you don't need very expensive equipment in order to listen the radio. You can use just a simple RF generator as LO source and feed it to RF mixer. The output of RF mixer just put to the sound card input. And such configuration allows you to listen radio even without filters. Adding filters allowing you to eliminate mirror channels and improve noise floor and dynamic range.If you want to experiment with your own signal processing, you can use GNU Radio. It provides signal processing blocks and you can put them together to configure your own signal processing structure. You don't need to know software development in order to deal with GNU Radio.

author: radiolistener
author_rank: Super Contributor
timestamp: December 24, 2020, 12:17:24 am
content: for example, you can use this RF mixer module:https://www.aliexpress.com/item/32798750251.htmlthis mixer have 10 dB amplifier and allows to listen for any frequency from 0 Hz to 500 MHz. If you want to listen for higher frequencies, you're needs another mixer for GHz range.Just connect:- RFin to the antenna- IFout to the sound card input- LOin to the generatorYou can use some cheap amateur generator like PSG9080 / FY6600 / UTG962 as LO source. Also you can use some more cheap Chinese RF generator module like si5351 and other. You're needs any RF generator which can produce stable frequency near the frequency which you want to listen.How it works: you're put some RF frequency to LO input of the mixer and the mixer shifts frequencies down from that frequency. For example if you put 7000 kHz on LO input, then you can listen 7020 kHz station at 20 kHz. It shifts all frequencies from 7000 kHz to zero (DC). So, you will be able to receive it with usual sound card on any PC.Just use HDSDR software and select sound card as input.I recommend to use LO with signal level -20..-30 dBm (amplitude 10-30 mV) for AD831. If you use some CMOS generator with 3 Vpp output, just use30-40 dB attenuatoron the LO input. Note: SMA-male is the input and SMA-female is output for such attenuators, don't confuse otherwise the attenuator may burn out due to large amplitude. Such attenuator can handle max 2 W (amplitude 14 V) on the SMA male side, but I don't recommend to exceed 1 W (amplitude 10 V).In order to improve reception quality, just add low pass filter with cut-off which corresponds to your sound card capabilities. For example, sound card which supports 192 kHz sample rate need LPF with cut-off below half of the sample rate. For 192 kHz it needs LPF with cut-off at about 80-90 kHz.Also you can use BPF filter for desired frequency band on the RFin to improve dynamic range.Of course, you can use LNA on the input to improve sensitivity, but ususal 16-24 bit sound card have good enough sensitivity to listen the radio at short wave (1-30 MHz).

author: MikeLud
author_rank: Regular Contributor
timestamp: December 24, 2020, 03:31:08 am
content: Quote from: radiolistener on December 24, 2020, 12:17:24 amradiolistenerI did not know this, I thought they were bidirectional, attached for clarification

author: radiolistener
author_rank: Super Contributor
timestamp: December 24, 2020, 02:33:18 pm
content: Quote from: MikeLud on December 24, 2020, 03:31:08 amI burned several attenuators just out of the box during the test, just because sellers don't write warning about that.When I burned next 30W attenuator with 5W power just out of the box, the seller wrote that this happened because attenuator is one way direction and I need to put power into SMA male connector. After that I realize why I burned several other Chinese attenuators.Now I know that Chinese attenuators are designed to apply power on SMA male side. It's incredible, but most of the Chinese sellers who selling these attenuators, even don't know about that.Also I found they marking SMA male connectors with "SU" mark. I think this is an indication that this side is designed as high power input.Here is what is inside of these attenuators (this one also was burned out), you can see 0805 capacitors on the background for size comparison:

author: radiolistener
author_rank: Super Contributor
timestamp: December 27, 2020, 05:39:44 pm
content: Here is another firmwarwe for LTDZ:http://wkiefer.de/x28/test/data_LTDZ.binhttp://wkiefer.de/x28/test/data_LTDZ.hex

author: DH1AKF_Wolfgang
author_rank: Contributor
timestamp: December 28, 2020, 08:31:28 am
content: What does it mean:"Here is another firmwarwe for LTDZ:" ?I made a memory dump from my original LTDZ device and posted the link to "radiolistener".This is the original firmware of my device.Best regards, DH1AKF

author: radiolistener
author_rank: Super Contributor
timestamp: December 28, 2020, 01:05:04 pm
content: Quote from: DH1AKF_Wolfgang on December 28, 2020, 08:31:28 amThe firmware from your LTDZ is different from my one that I shared before.So, now we have at least two different firmware for LTDZ.Also firmware from D6 is compatible with LTDZ.

author: Bicurico
author_rank: Super Contributor
timestamp: December 28, 2020, 02:02:40 pm
content: Changing the FW will not improve the low sensitivity/high noise level.

author: DH1AKF_Wolfgang
author_rank: Contributor
timestamp: December 28, 2020, 02:24:23 pm
content: "Changing the FW will not improve the low sensitivity/high noise level."... But for adjustment of my QO100 helical antenna (2.4 GHz) the original firmware was completely adequate, in combination with the DL4JAL software.