DSDPlus Adjusting PPM on the fly?

[rjdj2000]

After getting fastlane awhile back to track a NXDN system, I used to be able to adjust the PPM in FMP on the fly. I can still use g/G for the gain but if I recall it was c/C to adjust ppm? or was it p/P? Anyways, I can no longer adjust the ppm directly in it anymore and I've been through all the .txt files in the folder to see if there was something I'm missing.

Jeff

 

[cg]

it is P/p if you are using FMP24. Do it while the FMP24 window is highlighted
To get the current Active keys, use the following in a batch file that will make a text file with the Options and Active Keys
FMP24 -h >FMP24_help.txt

 

[rjdj2000]

Ok. Have tried that as I thought that is what it was and it didn't change the ppm. Will have to fire it up again and mess with it. Only reason I'm changing it is I swapped RTL sticks and the ppm is different so once I get it figured out again, I can modify the batch file to load up at the correct ppm.

 

[rjdj2000]

Just a quick report back on this, got everything sorted out and the p/P did work this time to adjust PPM. Just had a HighPPMerr on the DSD+ window after getting the waveform lined up, so adjusted some more and got it all set. Have set the ppm in the bat file now as well.

 

[PDXh0b0]

Just a quick report back on this, got everything sorted out and the p/P did work this time to adjust PPM. Just had a HighPPMerr on the DSD+ window after getting the waveform lined up, so adjusted some more and got it all set. Have set the ppm in the bat file now as well.

I get that highppmerr on some sites with fmp24.cc, like a conventional p25, no amount of ppm adjustment gets red of it long term, I just click the fmp24 spectrum then shift A to disable auto adjustment

 

[saioke]

I get that highppmerr on some sites with fmp24.cc, like a conventional p25, no amount of ppm adjustment gets red of it long term, I just click the fmp24 spectrum then shift A to disable auto adjustment

Yeah for some reason disabling auto adjustment works better for me as well after finding your ppm, as well as tightening the bandpass filter in FMP24 with shift+t. I think it works better on both accounts due to my signal being fairly weak though. That being said, voices seem less clear with a tightened bandpass filter. That could be in my head, but it seems that way. Could up the bandwidth from 9.5 to 12.5 but I think that would defeat the purpose of the tightening since 12.5 seems too wide for the site I'm picking up.

 

[PDXh0b0]

Yeah for some reason disabling auto adjustment works better for me as well after finding your ppm, as well as tightening the bandpass filter in FMP24 with shift+t. I think it works better on both accounts due to my signal being fairly weak though. That being said, voices seem less clear with a tightened bandpass filter. That could be in my head, but it seems that way. Could up the bandwidth from 9.5 to 12.5 but I think that would defeat the purpose of the tightening since 12.5 seems too wide for the site I'm picking up.

The good Ole bandwidth, been slapped a few time on here over it lol. Honestly if I feed a conventional p25 with a 10,000 khz bandwidth via sdr++ into dsdplus.exe it sound clearer too me than the fmp24's 9.5 or 12.5 options

 

[DaveNF2G]

Sometimes FMP24 shows a PPM error when there is a strong signal on an adjacent channel. Be sure to check the FMP spectrum display before making PPM adjustments.

Reducing the gain might help in that situation.