DSD-NEO help

[RobDLG]

I tested a recent nightly build of the dsd-neo "AppImage" under Red Hat Enterprise Linux 9.7, and was able to successfully scan a local P25 system!

I started in a basic command-line environment, and learned that I needed to ensure that the libXau, libxcb, and fuse-overlayfs packages were installed. Then I ran the following script.

#!/bin/bash

export TZ="America/Denver"

RTL_ID="0"

# Las Cruces P25 - https://www.radioreference.com/db/sid/13465
CSV_SITE="lc.csv"
#CSV_GROUPS="db/groups/391/391.csv"

# center frequency
#FREQ="853.309M"
FREQ="852.950M"

AGC="0"
PPM="0"
BW="24"

# trunking with RTL-SDR Blog V4
dsd-neo -ft -i rtl:"$RTL_ID":"$FREQ":"$AGC":"$PPM":"$BW":0:2 -T -C "$CSV_SITE" -o null -N 2> console_log.txt

Initially, I set the "center frequency" to the numerical center of the system's frequency range, but that didn't work as well as setting it to the currently active control frequency. Screenshot:




As it happens, many of the P25 channels are also on a currently operational EDACS system. When I tested dsd-neo on this EDACS system, though, it froze after the first call. I did not investigate further.

Nevertheless, seeing the P25 output was pretty cool. Thanks, @arancormonk!

 

[ki4hyf]

If you need to hear decoded audio, remove -o null from the last line in your script.

 

[arancormonk]

I tested a recent nightly build of the dsd-neo "AppImage" under Red Hat Enterprise Linux 9.7, and was able to successfully scan a local P25 system!

I started in a basic command-line environment, and learned that I needed to ensure that the libXau, libxcb, and fuse-overlayfs packages were installed. Then I ran the following script.

#!/bin/bash

export TZ="America/Denver"

RTL_ID="0"

# Las Cruces P25 - https://www.radioreference.com/db/sid/13465
CSV_SITE="lc.csv"
#CSV_GROUPS="db/groups/391/391.csv"

# center frequency
#FREQ="853.309M"
FREQ="852.950M"

AGC="0"
PPM="0"
BW="24"

# trunking with RTL-SDR Blog V4
dsd-neo -ft -i rtl:"$RTL_ID":"$FREQ":"$AGC":"$PPM":"$BW":0:2 -T -C "$CSV_SITE" -o null -N 2> console_log.txt

Initially, I set the "center frequency" to the numerical center of the system's frequency range, but that didn't work as well as setting it to the currently active control frequency. Screenshot:


View attachment 199144

As it happens, many of the P25 channels are also on a currently operational EDACS system. When I tested dsd-neo on this EDACS system, though, it froze after the first call. I did not investigate further.

Nevertheless, seeing the P25 output was pretty cool. Thanks, @arancormonk!

ah, i think i found the cause: on EDACS analog calls, if RTL squelch is disabled (sql=0), DSD-neo could stay on the voice channel after the first call and look frozen. i improved release detection and added a safety timeout, so it returns to the control channel instead of hanging. latest nightly build has the fix.

workaround for current build: set a real squelch value (negative dB), e.g. -70 to -90, and keep using -T with -fh/-fe and a correct EDACS LCN CSV.

let me know if that works