SDS100 - Issue with single channel NXDN

[bman87]

Hello,

At my place of work we recently went from analog radios to digital. We have 3 channels and 2 of them are on a repeater. They are ICOM HTs.

I am brand new to the SDS100; I was able to program a new favorites list, with 1 conventional system, and 3 departments with a single channel programmed on each with the respective RX frequency. I set the audio type to Digital Only, NEXEDGE, RAN63 (Confirmed this when I set this to auto and got an RX on all 3 channels) NFM modulation.

It seems to be scanning OK, but it is slow to latch onto a transmission and I usually miss the first few seconds of a TX. And if there is another TX very shortly after the first one, the scanner will miss it completely. I can easily test this while at work and can hear the different between our ICOM HTs and the SDS100.

I have also tried using a single department with all 3 channels set up under that. I have also messed with the squelch to see if it makes a difference.

Any suggestions to make the SDS100 pick up these transmissions quicker? I have this favorites list enabled ONLY, nothing else is being scanned.

(We were planning on going to a trunked NXDN system this year, but now that might not happen with COVID messing up our revenue)

 

[jonwienke]

Don't program as conventional, program as NXDN one frequency trunked. The scanner thinks conventional is analog, and takes time to switch to digital mode.

 

[bman87]

Ah, thank you. This old thread was confusing me and it seemed like opposite was true.

NXDN One Frequency vs Conventional NXDN Programming

I've been working on a couple new NXDN systems here and have noticed something on both the x36hp and SDS 100 while programming. When I program the system as a One Frequency NXDN and add the TGID 0, both scanners seem to miss alot of transmissions. When it's programmed as Conventional NXDN...

forums.radioreference.com

 

[werinshades]

Ah, thank you. This old thread was confusing me and it seemed like opposite was true.

NXDN One Frequency vs Conventional NXDN Programming

I've been working on a couple new NXDN systems here and have noticed something on both the x36hp and SDS 100 while programming. When I program the system as a One Frequency NXDN and add the TGID 0, both scanners seem to miss alot of transmissions. When it's programmed as Conventional NXDN...

forums.radioreference.com

Don't be confused. Others have noted issues with NDXN One Frequency Trunk Systems, and I posted my findings. I also submitted a few debug files which were dismissed as weak signal, but was 4 city blocks away and noticed the issue. Try it as suggested, but if you have issues, revert back to conventional programming to receive correctly.

 

[w9sar]

I have the BCD996P2 and trying to figure out if a NXDN system is a single-channel trunked and if I need the LCN if it is. I'm being told by one of the contact people for that system that it's a "digital trunked" system but they don't seem to know what that really means (and if it's single-channel trunked or what). The system does use five frequencies, and I can receive traffic on each frequency if programmed as separate, conventional, frequencies. I tried programming as single-frequency trunked and it does seem to receive ok, but I think I'm still missing some traffic.

 

[werinshades]

I have the BCD996P2 and trying to figure out if a NXDN system is a single-channel trunked and if I need the LCN if it is. I'm being told by one of the contact people for that system that it's a "digital trunked" system but they don't seem to know what that really means (and if it's single-channel trunked or what). The system does use five frequencies, and I can receive traffic on each frequency if programmed as separate, conventional, frequencies. I tried programming as single-frequency trunked and it does seem to receive ok, but I think I'm still missing some traffic.

Are you seeing talkgroup 0 or a variety of them?

 

[w9sar]

Are you seeing talkgroup 0 or a variety of them?

Sorry for the delay, but just saw your response. Most of the time, I'm seeing TG 0, but occasionally something else but I'm thinking those might be "spurious." I've come to the conclusion that this is a Type D "single-channel" system even though it uses five frequencies. Seems to be more accurately described as a simulcast system.

 

[werinshades]

Sorry for the delay, but just saw your response. Most of the time, I'm seeing TG 0, but occasionally something else but I'm thinking those might be "spurious." I've come to the conclusion that this is a Type D "single-channel" system even though it uses five frequencies. Seems to be more accurately described as a simulcast system.

This would lead me to believe it's a One Frequency NXDN Trunk system and should be programmed as such. The few OFT NXDN systems I've programmed use TGID 0 as default. Set each frequency as it's own system, see if conversations are being followed.

 

[w9sar]

This would lead me to believe it's a One Frequency NXDN Trunk system and should be programmed as such. The few OFT NXDN systems I've programmed use TGID 0 as default. Set each frequency as it's own system, see if conversations are being followed.

Thanks. I'm experimenting with different configurations but I'm losing transmissions (replies) regardless which config I use.