Using RSP1A With SdrSharp 1361

[ka3jjz]

Ah, the SX110 - I restored that radio after a near-strike....wonderful audio, and selective for its time...back to reality (SDRs)...Mike

 

[ArloG]

Mine was a BC-348Q dad brought in from the salvage yard in the USAF. Looked at it for a week or 2. It had a dynamotor.
He brought over an Airman from avionics for dinner and beers. Mom cooked. She liked a beer or 3 too
Brought in a box from the trunk of his car and we went in the cellar. Made measurements and went to the metal fab shop to cut and punch a sheet of aluminum. Before long he had a tube supply fashioned up and the RF circuits aligned.
The first receive was WWV on several freqs. I was hooked. Many many late nights way past my bed time spinning knobs.
I asked the Airman one day what the "oink oink" voice traffic was. He told me to turn on the CW Oscillator and use the Beat Freqnuency knob and get back to him. I was getting SSB before not too long.
I was 8.

 

[KC_zero_DSU]

Ah, the SX110 - I restored that radio after a near-strike....wonderful audio, and selective for its time...back to reality (SDRs)...Mike

Very well then, back to our Software Defined Reality. Here are some screen shots and contents of the .bat files I've been trying to use to get things going and what it looks like when I load them.

 

[KC_zero_DSU]

I figured something out for sure. Here's what I did, FMPP.bat is configured this way:

fmpp -o20001 -f851.7125 -b12.5 -rc -L8 -M50

And 1R.bat is configured this way:

DSDPlus -r1 -e -T -E -Pwav -i20001 >>1R-log.txt

And the DSDplus.frequencies looks like this:

p25, BEE00.1B2, 1, 113, 851.7125, 0.0, 0
p25, BEE00.1B2, 1, 183, 852.1500, 0.0, 0
p25, BEE00.1B2, 1, 387, 853.4250, 0.0, 0
p25, BEE00.1B2, 1, 237, 852.4875, 0.0, 0
p25, BEE00.1B2, 1, 411, 853.5750, 0.0, 0
p25, BEE00.1B2, 1, 435, 853.7250, 0.0, 0
p25, BEE00.1B2, 1, 332, 853.7750, 0.0, 1

I'm getting audio now, and actually hearing voice traffic instead of just static and the digital sound of the CC. The thing that did the trick was tinkering with the LNA gain -L switch, and IF gain -M switch values. This is pretty sweet, this SDR can hear stuff that my BCD996P2 doesn't even though I have it programmed in there. And I'm using the same antenna, not on both at the same time (no splitter or anything). I am noticing though that there is a whole lot less traffic since they locked down due to covid-19 around here. I heard the army national guard and air national guard and I never hear them on the scanner. I think I need to make some sorta further adjustments because some of the voice sounds digitized and garbled and sometimes it's missing stuff that my scanner grabs. But overall I'm pretty pleased now.

 

[slicerwizard]

You don't have an FMPP.bat file.

P25 trunking channel entries don't belong in the DSDPlus.frequencies file. DSD+ maintains that data in the DSDPlus.P25data file.

Your source audio display looks terrible. Can't troubleshoot it because you haven't shown the FMPP spectrum display.

 

[KC_zero_DSU]

You don't have an FMPP.bat file.

P25 trunking channel entries don't belong in the DSDPlus.frequencies file. DSD+ maintains that data in the DSDPlus.P25data file.

Your source audio display looks terrible. Can't troubleshoot it because you haven't shown the FMPP spectrum display.

I have an FMPP-CC.bat file, that is what I meant. I snapped a screenshot of it open in notepad++ above. I did notice that there is frequency data in the DSDPlus.P25data file but did not know that it was loaded from that file, I thought it was a log file. But once your locked on to a control channel it makes sense that DSD+ must grab the trunked voice frequencies, OTA channel #'s, and everything else needed to follow the system and stick it in the .P25data file.
I'll attach a pic of the FMPP spectrum display. The audio coming out the speakers sounds pretty good, I get some garbled voice once and awhile but noticed those same transmissions also sound garbled on my scanner scanning the same system. So I think that is either on their end or I need my antenna higher up or a better one. I tinkered with some things and think the source audio is looking better now.

 

[KC_zero_DSU]

Here is one of the recorded audio files, you'll have to change the extension back to .wav

 

[DRL-XM43]

Are you blocking encrypted traffic -e that may be your garbled audio?

 

[KC_zero_DSU]

Are you blocking encrypted traffic -e that may be your garbled audio?

Yes I'm blocking it. Some of it just sounds like it's getting cut off, some of it sounds like a voice channel getting walked on with digital data, some of it, well I'm not sure how to explain it, it's voice but has this digitized distortion to it. I attached a file you'll have to download and change file type to .wav But it's a perfect example of the voice with digitized distortion. If the frequencies file isn't for p25 what is it used for?