DSD+ FastLane P25 No Longer Decoding

[AB9NN]

I use the following two lines of bat code to start my radio and tune the known strong signal. The output below is what I am getting from it. It doesn't seem to be loading the frequency and trying to tune it. Can anyone point out what might be wrong with my code? Thanks!

START FMP24 -rc -i1 -o20001 -P0.0 -f853.9625 -_2 -g47 -b12.5
START DSDPlus -r1 -e -T -E -Pwav -i20001 -O NUL -_1

 

[maus92]

Has the control channel changed?

 

[DaveNF2G]

What role is DSDPlus configured as? It looks like you have a control channel monitor with no voice follower.

 

[AB9NN]

What role is DSDPlus configured as? It looks like you have a control channel monitor with no voice follower.

It's a P25 system, so there is only a control channel to start....

 

[RMason]

I use the following two lines of bat code to start my radio and tune the known strong signal. The output below is what I am getting from it. It doesn't seem to be loading the frequency and trying to tune it. Can anyone point out what might be wrong with my code? Thanks!

START FMP24 -rc -i1 -o20001 -P0.0 -f853.9625 -_2 -g47 -b12.5
START DSDPlus -r1 -e -T -E -Pwav -i20001 -O NUL -_1

The FMP24 console output indicates that it has tuned to 853.9625. I recommed removing the -_2 option in the FMP24 command while you debug this so that the spectral display is not minimized (or manually maximize the window). This should allow you to visually see what FMP24 is doing.

 

[AB9NN]

Has the control channel changed?

Great question! Just confirmed it is the same control channel, although the database lists two control channels for one site.

 

[maus92]

Has your dsd configuration ever worked?

Sites always have at least two frequencies designated as control channels (Motorola); some sites can use any site frequency as a control channel (L3Harris and others). I am assuming that you have verified 853.9625 is the current / active control channel.

Looks like this is the Honor site, correct?

Also noting that you are not applying any ppm correction and are using a significant amount of gain. Most sdrs require some ppm adjustment, and too much gain can be a bad thing.

 

[RMason]

Has your dsd configuration ever worked? Sites always have at least two frequencies designated as control channels (Motorola); some sites can use any site frequency as a control channel (L3Harris and others). I am assuming that you have verified 853.9625 is the current / active control channel. Looks like this is the Honor site, correct?

From the OP's location:

Michigan's Public Safety Communications System (MPSCS) Site: Honor

Michigan's Public Safety Communications System (MPSCS) Site: Honor Details

www.radioreference.com

The other control channel listed is 853.4625.

 

[AB9NN]

The FMP24 console output indicates that it has tuned to 853.9625. I recommed removing the -_2 option in the FMP24 command while you debug this so that the spectral display is not minimized (or manually maximize the window). This should allow you to visually see what FMP24 is

Has your dsd configuration ever worked?

Sites always have at least two frequencies designated as control channels (Motorola); some sites can use any site frequency as a control channel (L3Harris and others). I am assuming that you have verified 853.9625 is the current / active control channel.

Looks like this is the Honor site, correct?

Also noting that you are not applying any ppm correction and are using a significant amount of gain. Most sdrs require some ppm adjustment, and too much gain can be a bad thing.

This has worked with this frequency and no Parts correction for several years.... DUHHHHH... I JUST got it working! I had inserted a LNA with a strong filter in it for decoding Russian weather satellites and it seems it had totally knocked out this strong signal! Impressed by the strength of the filter! My bad - sorry to bother everyone. Thanks for the tip on eliminating the -_2 to see the spectral display!

 

[dave3825]

Thanks for the tip on eliminating the -_2 to see the spectral display!

Depending on the version of Fastlane you are running, you may be able to eliminate a few more things.

notes.txt says;
DSD+ 2.516

*** Make a backup copy of your DSDPlus.radios file. ***

Due to a file format change, this update will discard
all Motorola talker alias data that is present in your DSDPlus.radios file.
This update will reacquire your talker alias data from the DSD+ talker alias server.

Removed -t -T and -E command line parameters.

notes.txt said; DSD+ 2.441

Some command line options and keyboard commands have been removed.
DSDPlus -h lists all command line options and keyboard commands.

 

[maus92]

Initially mentioning a change in your signal path would have been informative.

 

[saioke]

This has worked with this frequency and no Parts correction for several years.... DUHHHHH... I JUST got it working! I had inserted a LNA with a strong filter in it for decoding Russian weather satellites and it seems it had totally knocked out this strong signal! Impressed by the strength of the filter! My bad - sorry to bother everyone. Thanks for the tip on eliminating the -_2 to see the spectral display!

You're lucky. I've heard that using an LNA and tuning to strong signals can overload and destroy your SDR. Never attempted it myself.