Search found 26 matches

by radiolistener
Sat Jul 13, 2019 7:24 am
Forum: User Projects
Topic: How to buy an SDR chip
Replies: 9
Views: 1042

Re: How to buy an SDR chip

in my opinion, RTL2832 is a bottleneck. It works well for 20 dollars dongle receiver. But if you want something better it will turns into the weakest part of your device. It has small dynamic range, it has bad IMD, it has spurs, it has too small bandwidth... It even cannot utilize all parameters of ...
by radiolistener
Thu Jul 11, 2019 6:41 am
Forum: Antennas
Topic: Three 1-meter antennas = One 3-meter antenna?
Replies: 4
Views: 2460

Re: Three 1-meter antennas = One 3-meter antenna?

It's not so clear which frequency and which type of antenna did you means. I googled a little about SETI and probably you're talking about 1420-1720 MHz. https://www.seti.org/seti-institute/project/details/seti-observations Parabolic antenna gain is: Gain = 10 * log10( k * ((pi * D/lambda)^2 ) Sourc...
by radiolistener
Thu Jul 11, 2019 2:09 am
Forum: Troubleshooting Help
Topic: Has anyone managed to get a Raspberry Pi 4 working with an RTL SDR?
Replies: 7
Views: 531

Re: Has anyone managed to get a Raspberry Pi 4 working with an RTL SDR?

I had the same errors on windows when several dongles was connected to PC simultaneously.
by radiolistener
Wed Jul 10, 2019 11:45 am
Forum: Troubleshooting Help
Topic: Inconsistent frequency tuning in Windows 10
Replies: 2
Views: 220

Re: Inconsistent frequency tuning in Windows 10

it seems like sdr-console bug. This software has interesting, but strange and not comfortable UI and may be buggy drivers.

Try to use HDSDR, it is more stable, much more flexible and has comfortable UI for quick tuning and ether monitoring.
by radiolistener
Sat Jul 06, 2019 4:27 pm
Forum: Troubleshooting Help
Topic: Direct sampling interference vs upconverter
Replies: 7
Views: 601

Re: Direct sampling interference vs upconverter

In picture signal just below overloading. More level more interference but no signal level increase. These spurs are receiver IMD distortions. RTLSDR has IMD about 50-60 dB, so these spurs will appears 50-60 dB below strong signal. DC-spike rigth at 6.28Mhz, DC-removal will remove it but no affect ...
by radiolistener
Sat Jul 06, 2019 8:31 am
Forum: Troubleshooting Help
Topic: Direct sampling interference vs upconverter
Replies: 7
Views: 601

Re: Direct sampling interference vs upconverter

I don't have such spurs around 6 MHz on directsampling mode with open input. If it appears when you connect high level 6 MHz source, then this is intermodulation distortions. This is known issue of any receiver. Smaller level of these spurs means better IMD performance of the receiver. If it is miss...
by radiolistener
Fri Jul 05, 2019 5:50 am
Forum: Troubleshooting Help
Topic: USB_claim_interface error -6 Eliminate unplugging
Replies: 1
Views: 212

Re: USB_claim_interface error -6 Eliminate unplugging

when your program is stopped to work unexpectedly, you're needs to check it in the task manager. Very often part of this porgram still stays in memory and keeps connection with USB device. This is why it cannot be opened when you start a new instance of the application. Just kill this ghost process ...
by radiolistener
Fri Jul 05, 2019 5:46 am
Forum: Troubleshooting Help
Topic: Spikes on HF frequency
Replies: 6
Views: 473

Re: Spikes on HF frequency

then you're needs to replace power supply of your computer. Normal PSU should not produce so high noise. May be this is some cheap Chinese PSU, if so then look for branded one.
by radiolistener
Thu Jul 04, 2019 3:50 am
Forum: Troubleshooting Help
Topic: Spikes on HF frequency
Replies: 6
Views: 473

Re: Spikes on HF frequency

Most of all is that source of these spikes is some electric equipment in your home, or your neighbors. Usually this is something with switching power supply. Also, some cheap low quality LED lamps and cheap USB chargers can produce such noisecause it. Also malfunction mercury-vapor lamps near your h...
by radiolistener
Thu Jul 04, 2019 3:44 am
Forum: Troubleshooting Help
Topic: Do I Need To Determine PPM
Replies: 2
Views: 195

Re: Do I Need To Determine PPM

No, RTLSDRv3 has TCXO and it's value pretty precise.
For example HDSDR is unable to calibrate it more precise, because correction is too small.

Frequency mistake is about 5 Hz at 7 MHz.