Hi,
When you are using an SDR device, without any external hardware filters, then it doesn't matter where you listen to (your range of 2MHz). In this case, you can observe interferences also from other bands!
You wrote about the APRS from the local station 5km away, so it is the terrestrial source. What is the freqency?
You can make as narrow as possible antennas, you can use or build some RF filter between antenna and the SDR, however, I think a cheaper solution is to build some 2m handy radio, where you have some RF filters and some attenuation between nearest freqencies.
73, Armand SP3QFE
W dniu 2020-12-28 18:34, Andy Brian napisał(a):
Hi,
I received many pictures from ISS. I'm using RTL dongle 2832 with SDR# program and MMSSTV with virtual cable and Orbitron.I found many rainbow lines on pictures and I analysed that this is the case of transmission with APRS local stations around 5km away and 1mhz below my receiving. Anyone have experirence of good filtering or set the SDR# program to reduce the infulence from of transmitter which is far away from 145.8MHz but still in the 2MHz bandwidth of RTL2832?
BR Andy
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