LNA/IF gain and BW questions on RSP1a using DSD+

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dragonbytes

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I've been having fun decoding P25 with DSD+ on the SDRplay but I am a bit confused as to what values to choose for the LNA and IF gain via the FMPP.exe part of the program. Sometimes raising one value or the other seems to cause more errors in the decoding. How do I go about finding the best values for my RSP1a? Also having trouble getting the bandwidth filter width to stick while its following control channel. As soon as it has to follow to another frequency and retune the SDR, it resets back to default of 9.5 khz. Is there any way to get FMPP.exe to keep the value I set at the start using the -b flag? Any advice would be appreciated!
 

salado

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same.
I play with the Gain/IF by clicking the spectrum box and using "J" and "shift+J" and "K" and "Shift+K" go go up and down to see if it improves or not. Depending on signal strength I noticed I have to adjust them a lot. I wish you could set the LNA and IF gain per site or Per system in the DSDPlus.networks or the DSDPlus.sites files.
Also hate that you cannot set the bandwidth, even with setting b-12.5 if im on a P25 it seems to always change back to 9.5 even though sometime I noticed its better reception with 12.5. also you can use "B" and "shift+B" to change bandwith on the fly.
 

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