GM300 drifting

Bill Rogers · Post by **Bill Rogers** » Sun May 04, 2003 2:37 pm

Greetings. I have 2 GM300s that both have the same problem. After they warm up they get distorted and seem to drift off frequency on both transmit and receive. Any ideas? Thanks in advance for any advice. Bill

Nand · Post by **Nand** » Sun May 04, 2003 3:10 pm

Bill Rogers · Post by **Bill Rogers** » Mon May 05, 2003 3:35 am

Thanks Nand. I'll check it out. bill

Susan157 · Post by **Susan157** » Mon May 05, 2003 12:15 pm

Yes we found the osc was always the bad one
also.
Hi we live in Canada.

Will · Post by **Will** » Tue May 06, 2003 12:46 am

Also, if the radio was force fed a code plug from another radio, the compensation setttings for the reference oscilator will be incorrect and it WILL drift with tempature. You have to go thru the RF and logic board replacement procedures in the RSS. Specifically the crystal perimitters and the voltage reading that are entered into the RSS.

arlojanis · Post by **arlojanis** » Tue May 06, 2003 4:53 am

The board interconnect pins may need cleaning.

GM300 drifting

GM300 drifting

Yes we always found the osc also.