Receiver overload?
Posted: Wed Dec 23, 2015 9:28 pm
Hello,
I am getting lots of VHF traffic on UHF with the RSP. Before you roll your eyes let me say these signals are not very strong and consist of business users and random FM BCB carriers scattered across the screen in the mil air band (240 - 380 MHZ). My cheap R820T2 is not having this issue and the spectrum is clean. I first noticed this problem in the 30 - 49 MHZ range, FM BCB stations would show up when they do not on the realtek. I live in a remote town with no road access and certainly no strong transmitters (our ONLY FM station is 50 watts) and a few low powered handhelds around town. (2-5Watts) I tested the RSP and the realtek together far out in the woods and the realtek was the winner; No images, no USB noise or random junk flowing down the screen and especially no out of band transmissions. I also do not get ANY of these problems when back home with the realtek!
My other question is why does lowering the RF front end gain in the above bands not making any difference in removing these out of band signals?
Setting the IF bandwidth lower for more dynamic range also does not help! What is going on here??
I was using SDR# 1361 for the test with the latest RSP driver (3.5 build 1222)
The realtek driver is from rtl-sdr.ru
I am getting lots of VHF traffic on UHF with the RSP. Before you roll your eyes let me say these signals are not very strong and consist of business users and random FM BCB carriers scattered across the screen in the mil air band (240 - 380 MHZ). My cheap R820T2 is not having this issue and the spectrum is clean. I first noticed this problem in the 30 - 49 MHZ range, FM BCB stations would show up when they do not on the realtek. I live in a remote town with no road access and certainly no strong transmitters (our ONLY FM station is 50 watts) and a few low powered handhelds around town. (2-5Watts) I tested the RSP and the realtek together far out in the woods and the realtek was the winner; No images, no USB noise or random junk flowing down the screen and especially no out of band transmissions. I also do not get ANY of these problems when back home with the realtek!
My other question is why does lowering the RF front end gain in the above bands not making any difference in removing these out of band signals?
Setting the IF bandwidth lower for more dynamic range also does not help! What is going on here??
I was using SDR# 1361 for the test with the latest RSP driver (3.5 build 1222)
The realtek driver is from rtl-sdr.ru