Search found 44 matches

by qrp
Sun Feb 23, 2020 1:34 pm
Forum: Other SDR Devices
Topic: Automatic notch-filter for SDR# ?
Replies: 2
Views: 4234

Re: Automatic notch-filter for SDR# ?

use HDSDR, it already has automatic notch filter
by qrp
Sun Feb 02, 2020 3:20 pm
Forum: RTL-SDR Discussion
Topic: Lots of activity on RF, is it all real?
Replies: 6
Views: 3210

Re: Lots of activity on RF, is it all real?

Most of them are "fake signals". The source may be different, most of them are spurs from internal oscillators. Others are intermodulation products due to non-linear distortion in the RF frontend. And some of them are just images mirrored from different frequencies across spurs. The quality of recei...
by qrp
Sun Feb 02, 2020 3:13 pm
Forum: RTL-SDR Discussion
Topic: Broadcast AM filter - RF power tolerance?
Replies: 5
Views: 2404

Re: Broadcast AM filter - RF power tolerance?

it depends on how much power will be consumed on filter components due to heat loss, so technicaly it depends on the filter component quality. Better inductors and capacitors Q-factor, leads to smaller heat loss. Also it depends on capacitors maximum voltage. Usually SMD capacitors have 25-50 V limi...
by qrp
Fri Dec 20, 2019 9:39 am
Forum: RTL-SDR Discussion
Topic: AM frequency help with rtl-sdr USB
Replies: 24
Views: 5545

Re: AM frequency help with rtl-sdr USB

you can listen aircraft AM band (118–136.975 MHz) with any RTLSDR dongle. There is NO needs up/down converter for that. You can do it with RTLSDR, but the signal is weak, so you're needs good antenna and may be bandpass filter and LNA
by qrp
Mon Dec 16, 2019 10:29 pm
Forum: RTL-SDR Discussion
Topic: ExtIO_RTLSDR# - custom ExtIO for RTLSDR
Replies: 34
Views: 29968

Re: ExtIO_RTLSDR# - custom ExtIO for RTLSDR

how is possible to reduce the RF gain ? In particular on low hf bands where the noise is so high. There is no way to tune gain for direct sampling mode on RTLSDR dongle. Because there is no hardware which allows to change gain. Gain can be tuned for tuner, which is not used in direct sampling mode....
by qrp
Fri Dec 13, 2019 2:31 pm
Forum: RTL-SDR Discussion
Topic: ExtIO_RTLSDR# - custom ExtIO for RTLSDR
Replies: 34
Views: 29968

Re: ExtIO_RTLSDR# - custom ExtIO for RTLSDR

ik3jls wrote:
Fri Dec 13, 2019 7:31 am
Where can I find SDRuno v1.2 ???
sdruno 1.33 doesn't supports ExtIO.

You can download sdruno 1.2 with ExtIO support from sdrplay site download page:

https://www.sdrplay.com/downloads/
by qrp
Fri Dec 13, 2019 2:28 pm
Forum: Troubleshooting Help
Topic: Rising noise floor at tuned frequency?
Replies: 5
Views: 1793

Re: Rising noise floor at tuned frequency?

tim_rtd wrote:
Thu Dec 12, 2019 2:10 pm
Try clicking that Correct IQ button.
swap I/Q cannot help with noise floor, it just mirrors frequencies around DC (LO frequency)
by qrp
Tue Dec 10, 2019 12:13 pm
Forum: Other SDR Devices
Topic: RTL SDR dont work on Asus Prime B350 Pluse + Win7 x64
Replies: 11
Views: 23280

Re: RTL SDR dont work on Asus Prime B350 Pluse + Win7 x64

rtlsdrblog, it is linked with libusb 1.0.22-rc4, this version of libusb has a bug fix for usb3 issue for a new motherboards.
by qrp
Tue Dec 10, 2019 8:58 am
Forum: Other SDR Devices
Topic: RTL SDR dont work on Asus Prime B350 Pluse + Win7 x64
Replies: 11
Views: 23280

Re: RTL SDR dont work on Asus Prime B350 Pluse + Win7 x64

You can use these DLL files: https://www.rtl-sdr.com/forum/viewtopic.php?f=1&t=4710&start=20#p11796 it will solve your issue. This is known bug of libusb library which happens on modern motherboards. The archive contains rtlsdr.dll which is compiled with a fresh RC libusb with fixed bug. for SDR# yo...
by qrp
Tue Dec 10, 2019 8:42 am
Forum: Troubleshooting Help
Topic: Win 7 x64 (Ryzen/x470) Driver Issue with RTL-SDR Blog v3 dongle
Replies: 4
Views: 1520

Re: Win 7 x64 (Ryzen/x470) Driver Issue with RTL-SDR Blog v3 dongle

You can use these DLL files: https://www.rtl-sdr.com/forum/viewtopic.php?f=1&t=4710&start=20#p11796 it will solve your issue. This is known bug of libusb library which happens on modern Ryzen motherboards. The archive contains rtlsdr.dll which is compiled with a fresh RC libusb with fixed bug. for S...