TKR-850 Ver 1 Transmit Failure

[k4etn]

Hoping that someone out there has seen this issue and can help. One of my 70cm repeaters is a Ver. 1 TKR-850.

Here is the problem: After a unspecified period of time, could be several hours, 20 minutes into a conversation the repeater will not transmit repeat audio. There are no error codes on the display. Rx is fine, QT decode is fine, just no transmit. I do not have a service mic on this machine yet so no idea if local ptt is working.

If you power down the repeater, it will come back up and work just fine. I am not using a external controller and would prefer to use the internal Kenwood controller if possible.

Have checked for cold solder joints and all connectors are secure.

Ideas, theory or what ever would be helpful. When it's working it's a great repeater.

 

[discombobulated]

How long have you had the repeater in service? How long have you had the problem? What is the power output you are running?

 

[cmdrwill]

Time Out Timer.

 

[k4etn]

The 850 runs 18 watts output power to a TPL external amp for 90 watts output. Been in service since 2/4/15. Was sitting in my shop for a year or so until I found the site to put it up on.

Time out timer is set for 3 minutes.

 

[kayn1n32008]

Time Out Timer.

Yea... Check the TOT, the penalty timer, and rekey timer...


Sent from my iPad using Tapatalk

 

[ramal121]

20 minutes into a conversation the repeater will not transmit repeat audio.

I think you're saying transmit comes up but you are losing repeat audio. TOT will not cause this. I remember one TKR that was having a problem with repeat audio although the local mic always worked fine. I did not attempt to find the problem, shipped it to FTH and they repaired it. Has been working since.

Or, as the others are hinting, are you losing transmit (PTT) altogether?

 

[k4etn]

Went to the site this morning and looked at the settings for TOT, Penalty timer and rekey. Set the Penality timer and rekey values to off.

If you look at the help file for those settings, at the very bottom it says that those two timers are reset only on channel change or power off. (KPG-91D)

Anyhow, loaded the new setting and worked a friend for almost an hour non stop. We deliberately timed the repeater out 4 or 5 times. Each time it came back up with no problems whatever.

Since 1pm today several users have been on and working it pretty hard, more so than usual and it is working just great now.

My thanks to cmdrwill and k1n32008 for helping narrow this down.