Cdm 1250

[nick223]

So i have Motorola cdm 1250 an everytime i go to talk on the mic an key the button it makes a "chirping sound" like the sound the ht 1250's make when the battery is dieing is there a way in the program to shut this annoying chriping sound off??

[KYQ1952]

Double Check your Power Source/Supply and wiring for voltage dfrops under current load. When the voltage drops to about 11-11.5 volts on the back two pins of the radio during TX it give a low battery indicator. It could be a corroded connection in the line I have seen that drop the voltage just enough to Bleep Bleep!

Get a good volt meter and trace the power path to ground while keying and you probably will find the problem.
It is annoying when things look good but I have always been able to find something. Had a bad fuse holder once,spade lug on the battery,bad splice connector etc.

I have about 40 CDM1550s in my fleet.

Good Luck

[nick223]

Thanks

hooked it up to a bigger power supply an the chirp went away

[brian209]

Originally Posted by nick223

Thanks

hooked it up to a bigger power supply an the chirp went away

You already got the correct answer, but here is another story about the same issue: I had a CDM-1250 in a fire truck where it would do that whenever the halogen lightbar was on and the engine was at an idle. Fine while driving, but park the truck and try to give an on-scene report and it would chirp-chirp and cancel the transmit.

Brian

[BurkeComm-1]

Originally Posted by SCFCPD7

Double Check your Power Source/Supply and wiring for voltage dfrops under current load. When the voltage drops to about 11-11.5 volts on the back two pins of the radio during TX it give a low battery indicator. It could be a corroded connection in the line I have seen that drop the voltage just enough to Bleep Bleep!

Get a good volt meter and trace the power path to ground while keying and you probably will find the problem.
It is annoying when things look good but I have always been able to find something. Had a bad fuse holder once,spade lug on the battery,bad splice connector etc.

I have about 40 CDM1550s in my fleet.

Good Luck

I have a 2003 F-350 Powerstroke Diesel, Do you know what would make the engine RPM's decrease whenever I transmit on my CDM1250?

[NCFire11]

load on that alternator i would guess