GM300 / Signalling / Freq Response

KB5AKO · Post by **KB5AKO** » Sun Jun 11, 2006 9:34 am

I have UHF GM300's interfaced with a repeater controller and an FT2400 in a remote base configuration. I was getting tinny and hollow audio reports. The 551 jumper in my Rx is set at position B for de-emphasized audio and I am using pin 11 on the 16 pin connector. I am not overdriving. Upon closer inspection of the Rx codeplug; I noticed that signalling was activated. After I disabled this function, it seems that my audio is more natural sounding. Does this feature alter the freq response of the Rx audio?

Victor, KB5AKO

HLA · Post by **HLA** » Sun Jun 11, 2006 10:15 am

signaling is done before or after or both but not during so that shouldn't effect the audio you hear.

Will · Post by **Will** » Sun Jun 11, 2006 2:27 pm

Victor, make sure you have a coupling capacitor on pin 11 to isolate any DC on the radio or controller ect;. That can make the RX audio sound really bad.

Same for the Mic line going into the radio, 2.2uf + side to the radio IS required.