APX8000 MDC Scan Issues

[Garrison54]

Hey guys,
I've noticed that when using a conventional scan, I seem to be missing MDC sporadically and I can't seem to find a reason why.
By missing MDC I mean when it is scanning and lands on a channel the MDC is missed completely or sometimes, I miss the audio of the MDC/DOS mute but will get the ID/Alias.
I have no more than 15 channels in the scan list at a time.
I have not had this happen for me on my XTS's

Anyone else notice this or could it be programming?

APX8000
FW R33.52.00

 

[daine1619]

My 2 cents. It’s just one of the nuances of scanning any number of conventional analog channels. Your radio isn’t landed on the channel to pickup the entire MDC transmission.

My work radio is an APX8500 and I only scan 3-4 conventional channels when working and this will happen to me.

I have this issue in one county that I live near that uses Pre-MDC however the county next over uses Post-MDC and I get every single MDC decoded.

 

[mmckenna]

One of the risks with scanning is that you are not listening.

Things like Pre-MDC and 2 tone paging get missed because the radio is looking at other channels, and by the time it does realize there is traffic, it can miss the first tone of a page, or part of the MDC packet.

The way to fix it is to have the transmitting station send a long preamble on the MDC, or key up and wait before sending the two tone page.

Sometimes you can mess with the scan timing settings and get it to get -most- of the messages, which may explain why your XTS get them.

 

[Giddyuptd]

I've noticed hear clear or what ever it is called now can do this in a long scan list on a apx. If it's decoding the IDs, shouldn't be a issue. Does your radio have this enabled?

 

[Garrison54]

I've noticed hear clear or what ever it is called now can do this in a long scan list on a apx. If it's decoding the IDs, shouldn't be a issue. Does your radio have this enabled?

I don't have hear clear on at all in the radio

 

[Garrison54]

My 2 cents. It’s just one of the nuances of scanning any number of conventional analog channels. Your radio isn’t landed on the channel to pickup the entire MDC transmission.

My work radio is an APX8500 and I only scan 3-4 conventional channels when working and this will happen to me.

I have this issue in one county that I live near that uses Pre-MDC however the county next over uses Post-MDC and I get every single MDC decoded.

Yeah that seems to be the cause, it's just the way a conventional scan works. I would imagine the smaller the scan list the lesser amount of time lost