Архив за 17.06.2018

Новая разработка!_____МШУ с полосовым фильтром для приема погодных…

Новая разработка!_____МШУ с полосовым фильтром для приема погодных спутников
На 137 МГц усиление 12 дБ
В дальней зоне (например в районе FM радио) фильтр относительно полосы пропускания имеет подавление 20..30 дБ

Not able to demodulate Meteor M2 QPSK

Hi, I got a 16 bit PCM baseband recording of Meteor M2 in SDR#. I opened the .wav in audacity and resampled to 130000Hz. Then I tried opening the resampled .wav in LRPTrx and started demodulating but there are no visible constellations. Why?

submitted by /u/Tech2025_
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Antennas • Re: new Broadband design dc to 25 GHz to a much wider bandwidth of 10 to 110 GHz.

Well its hard for most DIYers to test the antenna at those frequencies, but you can probably make a fairly good eliptical monopole for lower frequencies(up to a few GHz). Obviously you need the kit to test and adjust it for optimum performance, but it will probably work well enough with guess work. The dimensions for the CPW feed is easy to find from online calculators.

Statistics: Posted by HighSNR — Sun Jun 17, 2018 7:34 pm

Comment on Running Osmo-FL2K on VMWare Workstation Pro by tom h

I have been running the binaries under win7 x64 with libusb0 (v1.2.6.0) and the only issue i have noticed so far – (noticed it in a ubuntu 15.10 VM as well) Is that after a random amount of time, the transmission abruptly ends / drops even though the fl2k_fm application is still running – I have been debugging this some and I have traced it down to an issue with processor affinity and / or process priority – I can start up fl2k_fm and pipe some audio to it using sox (under windows) and then immediately go in and set the process priority on fl2k_fm to realtime and I have been able to transmit this way for 16+ hours straight with no buffer underflow messages and no drop outs. The busier your cpu is, the more / quicker this dropout bug seems to bite. I’m sure some fixes need to be made in the code for both linux and windows in order to fix this bug. Also, if you crank the app up and with it transmitting, change the cpu affinity in task manager, the transmission will immediately drop out (hence why I think it is related to cpu affinity).

I just really hope somehow the above information gets picked up by the developers of the osmo-fl2k code for bugfix purposes!

Also, for those of you that would like to pipe audio into fl2k_fm using sox on windows, you will need:
and something like virtual audio cable.

Troubleshooting Help • w_scan odroid RTL_2832U


i am trying to use the w_scan under odroid c2.

i am getting the next error

>> sudo w_scan -c BE
w_scan -c BE
w_scan version 20141122 (compiled for DVB API 5.10)
using settings for BELGIUM
DVB aerial
DVB-T Europe
scan type TERRESTRIAL, channellist 4
output format vdr-2.0
WARNING: could not guess your codepage. Falling back to 'UTF-8'
output charset 'UTF-8', use -C <charset> to override
Info: using DVB adapter auto detection.
Please check wether dvb driver is loaded and
verify that no dvb application (i.e. vdr) is running.

for some reason the w_scan doesnt find the rtl-sdr module

i also tried the >>sudo modprobe dvb_usb_rtl28xxu
root@odroid64:~/rtl-sdr/build# lsmod
Module Size Used by
rtl2832 8730 0
dvb_usb_rtl28xxu 17025 0
rtl2830 8094 1 dvb_usb_rtl28xxu
dvb_usb_v2 16268 1 dvb_usb_rtl28xxu

w1_gpio 3785 0
wire 25663 1 w1_gpio
gxbb_wdt 3427 0
meson_gpiomem 4024 0
ipv6 376636 16
autofs4 28111 2

root@odroid64:~/rtl-sdr/build# sudo modprobe dvb_usb_rtl28xxu -r

root@odroid64:~/rtl-sdr/build# lsmod
Module Size Used by
rtl2832 8730 0
w1_gpio 3785 0
wire 25663 1 w1_gpio
gxbb_wdt 3427 0
meson_gpiomem 4024 0
ipv6 376636 16
autofs4 28111 2

so no luck sofar, any suggestions?


Statistics: Posted by kurtwerbrouck — Sun Jun 17, 2018 7:02 pm

137 mhz filter issues

Hi guys,

I am working on the 137mhz band pass filter, however my waveform looks a little odd.

It looks like it is stop some of the signals above and below, but not all and centre frequency is way off.

Any help appreciated



submitted by /u/daveyboy84
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Comment on Running Osmo-FL2K on VMWare Workstation Pro by Chris

I also had no success with the WinUSB driver (in my case under Win7).

All I can tell is that in runs using libusb (Win 7 as well).
However, in rare cases i get similar Errors. re-plugging mostly helps..

I did not test it under Win10, yet.

Всем привет. Приобрел этот приемник Foxwey. https…

Всем привет. Приобрел этот приемник Foxwey.
https ://m.ru.aliexpress.com/item/32722511183.html?pid=808_0004_0109&spm=a2g0n.search-amp.list.32722511183&aff_trace_key=bd75349f34194a158e88e8eb47ff4643-1529229046488-05432-UneMJZVf&aff_short_key=UneMJZVf&aff_platform=msite
Почему то в комментах пишут, нужен upconverter, хотя продавец сказал, что не нужен. Заказал баллун с кабелем, чтобы проверить на улице. В здании на втором этаже с телескопической антенной ловит только фм и тв. Телескоп трехсекционный снял от магнитофона с радиоприемником в выдвижном положении 75 см.
И почему-то с двух гнезд но в разных режимах ловит тв и фм вещалки, причем на всем диапазоне в sdr#. Снимал крышку, там две микрухи под радиаторами. Они ли, что в описании в инструкции? Поделитесь пожалуйста информацией о работе приемника этого. А то у них в видео на али все идеально так показано ). В интернете мало информации об этом бренде. Неужели еще допиливать его надо?

Antennas • Vexed !!

So i got this pocket HD radio a few days ago and I was experimenting with it. My plan was to improve its antenna. I have a miniwhip in the attic and a few other antennas that I used with RTLSDR. I tried all of them and using them this HD radio would barely pull in normal FM signals. So out of curiosity, I plugged in the regular ipod/walkman style headphones and lo and behold i was receiving about 8 HD stations and sub-channels. So I started experimenting with different options. I plugged in a head phone sharing adapter, plugged in the headphones in one slot and the cable to my amp to the other. no signal. I remove the cable to amp and it picks up some stations.

Any ideas what is happening ?

My theory -

1. Headphone shield cable is antenna. Connecting to car aux or amp aux is grounding the signal.
2. Tuned circuit for antenna and will not tolerate long cables to amp?

How do I separate this? I would like to be able to plug it into an amp and into the car.

Statistics: Posted by illllm — Sun Jun 17, 2018 11:53 am

Comment on Running Osmo-FL2K on VMWare Workstation Pro by kapuso

I tried the prebuilt binaries with Zadig WinUSB driver on my Windows 10 x64 machine, but it seemed to have some trouble with the libusb:

usb_claim_interface 1 error -12
libusb: warning [libusb_exit] some libusb_devices were leaked
libusb: warning [libusb_exit] application left some devices open
Failed to open fl2k device #0.

Any idea how to fix this?

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