Архив за 12.10.2018

Sound quality problem with SDR#

Hello Guys, So my biggest problem here is the sound quality I get from SDR sharp.

  • I use the 32 bit version of SDR sharp (the 64 bit one won't start) on Windows 10, running on a MacBook with Parallel. I gave windows 4Gb of ram and 3 processor cores.

  • The audio from SDR# is kind of distorted with a metallic sound. I also hear some spark sounds or "bird flock" every few seconds. That is a big problem because first it sounds like shit, second it prevents software like DSDplus and PDW to properly decode the audio :(

  • The audio problem ALMOST disappear ONLY if I put the sample rate at 0.25MSPS. It cannot be a processing or memory problem since at higher sample rate (lets say 2.4) my processor is only at 30% and my memory half full... What the hell is going on?

Do you have any idea how I could invesigate and fin the problem? Many thanks.

submitted by /u/GeoGemstones
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I do not understand the wiring of a qhf antenna

Hello some weeks ago i found a video of how to get signals from noaa satalites. In tje video they said you need to build a qhf antenna so i went searching on the internet how to build it. I found a lot of instructions and i understand almost everything. But there is one thing i dont understand. The antenna is made out of a short loop and a big loop. But is a loop 1 conection ? What i mean with that is: when you start at the top of the antenna and go with your wire to the bottom and put it in the mast does the other side of that loop connect with it ? I added a picture to show what i mean. Picture : https://drive.google.com/file/d/12hKjBXUI8B_vcF1TO1T2mRJI3jjI-hc0/view?usp=drivesdk

submitted by /u/dolfijn3000
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What ambitious SDR projects would you want to do at some point?

What projects do you like to daydream about doing while you're at work? What do you hope to make at some point in the future? Maybe an awesome ADS-B setup or a really cool Raspberry Pi SDR gadget or a giant mast covered in receivers?

Personally, I don't have many huge ambitions, a small setup of antennas on my roof for the frequencies I'm interested in would be great, maybe a small dish permanently pointed at one of the GOES satellites would be cool. I've also daydreamed about setting up a few things in my car for SDR on the go, and I have a quasi Pelican case that I've thought about building an SDR rig into. What about you?

submitted by /u/DuckEsquire
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Silly question, what should I unplug at the end of the night?

I've had my SDR for about a month and a half and I've been having a blast, but I'm weirdly paranoid about leaving anything plugged in once I'm done listening for the night, so I unplug almost everything from everything else. I have a telescopic antenna screwed into a magnetic base in my window (sometimes a stubby high frequency antenna instead) connected to an LNA powered by a 9-volt battery connected to my SDR, with a ham-it-up set to be delivered soon. Do I need to disconnect anything at all once I'm done, or am I wasting my time?

submitted by /u/DuckEsquire
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Troubleshooting Help • RTL-SDR v3 direct sampling over a network

Hello all!

First of all a quick summing up of the problem: I cannot get my RTL-SDR v3 stick to use direct sampling over a wireless network. Tuning low (HF) frequencies dosen't work at all (but does work if I do it directly via USB rather than a wifi network).

Here are the devices I'm using:

The first device is a raspberry pi 3 running raspbian. I'm using rtl-sdr to obtain rtl_tcp ( found at https://www.rtl-sdr.com/rtl-sdr-blog-v- ... ser-guide/ ) - I'm using the instructions found under the section "Modified rtl_tcp for direct sampling". This compiled fine on the raspberry pine and I'm able to run it without errors at a command, such as:


$ rtl_tcp -a -D 2 -s 240000
The second machine is a normal x86 machine running debian stretch and GQRX version 2.11.5 . I can tune and listen for FM radio fine but if I try to use HF, I get nothing but static, no signal.

I have GQRX set up with these settings:

- Device=other
- Input rate = 240000
- Device string = rtl_tcp=

I'm aware that to use direct sampling in GQRX I need to add "rtl=0,direct_samp=2" (without the quotes) to the device string section. However that appears to be only for use with a direct USB device, not network/tcp. If I try to do that as soon as I try to use GQRX I get this error:


Generating taps for new filter   LO:-5000   HI:5000 TW:2000   Taps: 115terminate called after throwing an instance of 'std::runtime_error'  what():  throttle(53): insufficient connected output ports (1 needed, 0 connected)Aborted
I'm guessing that rtl=0,direct_samp=2 is only for using USB devices direct (also leaving off rtl=0 does the same thing). But is there some sort of setting I need to use with either rtl_tcp or gqrx to be able to use HF and direct sampling at all ? So far I've drawn a blank I can find plenty of people using gqrx with direct sampling or using rtl_tcp with direct sampling but *not* using them both together!

I should add that if I use the RTL-SDR v3 stick directly on a PC with debian stretch and gqrx I don't have these problems; FM *and* HF work fine with direct sampling. I also have GQRXs' "No limits" enabled in all cases.

Output of code from raspberry pi after running rtl_tcp:


Found 1 device(s):  0:  Realtek, RTL2838UHIDIR, SN: 00000001Using device 0: Generic RTL2832U OEMFound Rafael Micro R820T tuner[R82XX] PLL not locked!Enabled direct sampling mode, input 2Tuned to 100000000 Hz.Bandwidth set to automatic resulted in 350000 Hz.listening...Use the device argument 'rtl_tcp=' in OsmoSDR (gr-osmosdr) sourceto receive samples in GRC and control rtl_tcp parameters (frequency, gain, ...).


Statistics: Posted by ljones — Fri Oct 12, 2018 8:49 pm

Comment on Spektrum: New RTL-SDR Spectrum Analyzer Software by hugh.g.rekshun

shit it doesn’t work in 32 bit like Windows XP,
that said not many do..

Comment on Getting the RTL-SDR to work in Windows 10 by Alex

The driver install fails.
Windows 10.
default driver set to ‘WinUSB’
Using inf name: Bulk-In,_Interface_(Interface_0).inf
Succesfully extracted driver files.
Installing driver. Please wait…
libwdi:info [extract_binaries] successfully extracted driver files to C:\usb_driver
libwdi:info [wdi_prepare_driver] succesfully created ‘C:\usb_driver\Bulk-In,_Interface_(Interface_0).inf’
libwdi:info [wdi_prepare_driver] Vista or later detected – creating and self-signing a .cat file…
libwdi:info [ScanDirAndHash] added hash for ‘C:\usb_driver\amd64\wdfcoinstaller01011.dll’
libwdi:info [ScanDirAndHash] added hash for ‘C:\usb_driver\amd64\winusbcoinstaller2.dll’
libwdi:info [ScanDirAndHash] added hash for ‘C:\usb_driver\bulk-in,_interface_(interface_0).inf’
libwdi:info [ScanDirAndHash] added hash for ‘C:\usb_driver\x86\wdfcoinstaller01011.dll’
libwdi:info [ScanDirAndHash] added hash for ‘C:\usb_driver\x86\winusbcoinstaller2.dll’
libwdi:info [CreateCat] successfully created file ‘C:\usb_driver\Bulk-In,_Interface_(Interface_0).cat’
libwdi:info [RemoveCertFromStore] deleted existing certificate ‘CN=USB\VID_0BDA&PID_2838&MI_00 (libwdi autogenerated)’ from ‘Root’ store
libwdi:info [RemoveCertFromStore] deleted existing certificate ‘CN=USB\VID_0BDA&PID_2838&MI_00 (libwdi autogenerated)’ from ‘TrustedPublisher’ store
libwdi:info [CreateSelfSignedCert] created new self-signed certificate ‘CN=USB\VID_0BDA&PID_2838&MI_00 (libwdi autogenerated)’
libwdi:info [SelfSignFile] added certificate ‘CN=USB\VID_0BDA&PID_2838&MI_00 (libwdi autogenerated)’ to ‘Root’ and ‘TrustedPublisher’ stores
libwdi:info [SelfSignFile] successfully signed file ‘C:\usb_driver\Bulk-In,_Interface_(Interface_0).cat’
libwdi:info [SelfSignFile] successfully deleted private key
Driver Installation: FAILED (Invalid parameter)
5 devices found.

Signal Identification Help • Re: Unknow signal

Airwind wrote:
Thu Oct 11, 2018 8:51 pm
Wait, what signal are we talking about here?
I assumed it was the strong curvy white one on the waterfall.
Because the waterfall Remon posted seems different although they do seem to sound similar.
I don't know bro, I'm here to discover it! Yes it is the discontinued white line. I want to say that in my area the signal is not strong. I had to use the function of the zoom to see it better.

Statistics: Posted by European-man — Fri Oct 12, 2018 1:58 pm

Comment on New TETRA Trunk Tracker for use with SDR# and the TETRA Demodulator Plugin by qba

in my case it was ppm issue – I had to set proper ppm to aim the center of carrier.
BTW thanks for tips.

Troubleshooting Help • SDR sharp stops playing radio after about a second

Hello, after I have correctly installed SDRSharp on Win 7 64 bit, I can watch frequencies, see signal strength and play sound on not used frequencies (the usual hiss). When I would like to listen sound on used frequency (for example any fm radio from 87 to 108 mhz) after about one second of playback the program freezes. I tested itmultiple times but the result was the same. What should I do? Johny33 it )

Statistics: Posted by johny33 — Fri Oct 12, 2018 8:42 am

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