No receive after 5 seconds unless channel change

[dickie757]

I had a batch of CP100ds VHF all identical to program for a customer...got a call explaining a weird behavior where a (single) radio can transmit then receive if end of transmission was at most 4 seconds ago. If 5 seconds, the radio will not show any sign of activity.

I went to the customer and proved it for my self. Then, I cloned a known good radio into problem HT. Same behavior.

Some facts: analog with DPL, but brought it back to the shop and went csq for test. No change. The test transmitting radio was still tx'ing dpl, but i dont think that matters. I was going to strip dpl from tx, but got distracted ran out of time.

Also, if channel is changed, then changed back to original, the "timer" resets.

Not sure how long it has been acting up, but I programmed the batch first part of November.

 

[dickie757]

A bit of an update. Tripping TOT gives it a whopping 1 min before going to hibernate.

I put an auto scan with a few channels, and that seems to keep it awake. Stop gap for sure.

 

[ramal121]

Strange for sure. That behavior smacks of Selective Call operation. Not sure if a CP100D can even do that on analog. Maybe you're down to a firmware refresh?

 

[dickie757]

Already did refresh recover. Thanks for suggestion.

 

[ramal121]

OK then. Well, you got my goat.

 

[dickie757]

Reviving topic.

We sent two radios back. After we got them back, one worked as expected, the other had same problem.

Now, after realizing this is a problem, I have been testing the new-in-box spares on default 403MHz ch1. Have found at least two nib funky CP100ds.

Moto is no help on this at all. They said they replaced main board on both...

 

[dickie757]

Update...for grins, I turned off Rx battery saver in General, General Settings. It cured it. I then changed it back to Rx battery save on, and it made it absolutely deaf at 5 seconds after last activity.

So, does anyone know how the battery saver function works?

 

[MTS2000des]

Typically it functions by turning off the front end and, audio PA, etc for periods then "waking" back up to check for activity. It sounds like it's not "waking" back up. Leave it disabled. It's about as useful a feature as the auto stop/start on modern vehicles.

 

[dickie757]

Ya, unchecked and works great.

I also confirmed that using a transmit radio that has Preamble enabled will not wake up the problem child.

 

[dickie757]

Ha, just found this