Архив за 20.01.2018

Troubleshooting Help • problems with rtl_sdr on Fedora 23

Greetings ! I'm a new user of the rtl_sdr dongle, just got my kit today (RTL-SDR Blog R820T2 RTL2832U 1PPM TCXO SMA Software Defined Radio with 2x Telescopic Antennas). I get the following report from 'rtl_test -t' :

$ rtl_test -t
Found 1 device(s):
0: Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6
Sampling at 2048000 S/s.
No E4000 tuner found, aborting.

Looking good so far, but when I try using gqrx I get no signal at all, regardless of settings. I launch the program at the prompt, where I receive a series of the following errors when I adjust the frequency values :

r82xx_write: i2c wr failed=-4 reg=17 len=1
r82xx_set_freq: failed=-4
rtlsdr_demod_write_reg failed with -4
rtlsdr_demod_read_reg failed with -4
rtlsdr_demod_write_reg failed with -4
rtlsdr_demod_read_reg failed with -4

Both gqrx and the rtl_sdr suite have been installed from the Fedora 23 repos.

As far as I can tell, I have gqrx configured correctly, but as I say, I'm a complete newbie to this stuff. I am however a long-time user of Linux (20+ years), I can and do compile software routinely here, and I'm quite willing to try about anything to get this thing working. I've been through the quick-start guide but got no joy, so I'm turning to this forum for help. Any suggestions ? Please advise if more information is needed. (I checked through all 18 pages of the troubleshooting forum but haven't yet found any messages with the identical problem.)

Btw, I'm interested in sdr for a couple of reasons, the primary being its use in a virtual Eurorack setting called VCV Rack, it's a software modular synthesis environment that includes a module for use with rtl_sdr. The other reason is that I was a ham radio operator when I was a teenager, it was a lot of fun then and I'm curious about this software radio thing. :)

TIA for any & all assistance !

Dave Phillips

Statistics: Posted by davephillips — Sat Jan 20, 2018 9:59 pm


Вобщем оставив этот драйвер делаем через zadig reinstall на composite (winusb 6.1.7600 должно быть в окошке справа в зад…

Fedor-sav пишет:
Вобщем оставив этот драйвер делаем через zadig reinstall на composite (winusb 6.1.7600 должно быть в окошке справа в задиге) Сделал все как вы сказали. Все бес толку. делаю через zadig reinstall на c...
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Широкополосный приёмник из DVB донгла - Страница #538

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Мда уж -тихий ужас -на втором скрине удаляем все ! дрова (inf ихи) кроме одного .inf (сomposite) из universal serial bus…

Fedor-sav пишет:
Мда уж -тихий ужас -на втором скрине удаляем все ! дрова (inf ихи) кроме одного .inf (сomposite) из universal serial bus.Почему стоит libwidi не пойму для composite-нужно libusb.info.Вобщем оставив эт...
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Широкополосный приёмник из DVB донгла - Страница #538

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Всем привет, как думаете будет толк??, завалялись у меня радиаторы от Малинки, решил их на RTL-SDR V3 приспособить чтоб поменьше грелся))…



Всем привет, как думаете будет толк??, завалялись у меня радиаторы от Малинки, решил их на RTL-SDR V3 приспособить чтоб поменьше грелся))

Комментарий к записи SDRsharper (Иван)

Извените свой свисток запустите а потом задавайте вопрос! Вопрос как уменьшить верхнюю полосу .Есть Zoom но как с ним работать подскажите пожалуйста!

RTL-SDR Discussion • Re: SDR Internet

Many thanks for the reply rtlsdrblog.
I have now researched what is available on the web for not such an expensive price. Guess I will go with the Airspy HF+. It has also the advantage of receiving VHF comms.

Statistics: Posted by ILSAPP — Sat Jan 20, 2018 5:48 pm


rtl_fm CTCSS filter on a Raspberry PI?

I'm trying to set up a Raspberry PI for listening to FM signals, and now I'm using this command:

rtl_fm -M fm -f 446.00625M -s 12k -g 50 | play -r 12k -t raw -e s -b 16 -c 1 -V1 - 

It works fine but I want to add CTCSS filtering, to only play the audio if the tone is also transmitted. I cant find any sox/rtl_fm features/filters which support CTCSS.

I was thinking about piping it through some kind of CTCSS filter tool but I didnt find any yet. Any help would be appreciated!

submitted by /u/xdavidhu
[link] [comments]

Antennas • UltraWideBand antenna design

This might be of interest to some people. I designed and built an cheap ultra-wideband directional antenna for use with my SDR.

The antenna is good from about 800MHz up to about 6GHz(perhaps beyond). There are plenty of signals up in these bands such as ADSB, GPS, WiFi and tons of GSM, UMTS and LTE etc. This is a great antenna for picking up any one of these.

My writeup is here in 3 parts.

https://hexandflex.wordpress.com/2017/1 ... tenna-pt1/
https://hexandflex.wordpress.com/2017/1 ... na-part-2/
https://hexandflex.wordpress.com/2017/1 ... rformance/

I have a small number availiable on my Tindie store if anyone would like to give it a try.

Statistics: Posted by HighSNR — Sat Jan 20, 2018 3:14 pm


Z33T Radio Beacon Automatic Keyer PIC16F84 [00:03:17]

This is Programmable Automatic Radio Beacon Keyer with PIC16F84 microcontroller.

Comment on Receiving Differential GPS Beacons with a HackRF by stephen

I’ve received DGPS signals on 300 and 320 khz as well as an NDB from my local airport on 250 khz, with an RTL-SDRblog radio and a homebrew Low Pass filter. (Just a coil of wire in series with the longwire antenna). NO up-converter. Just tuned there in Direct/Q mode. A proper ferrite stick antenna and maybe a pre-amp might work better. Then it’d be directional too. One station was in Richmond, BC, Canada, and the other said it was in Appleton, WA. I’m in Nanaimo, BC which is roughly 40-60 km from Richmond/Vancouver, BC. Appleton is on the far side of Washington state, and only came through at night. I love my RTL-SDR.

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