Connex 4800 dxle need help

[undertaker]

When i key the mic on ssb the freq counter goes nuts it will not stay on freq. what can be the problem??

thanks
Bobby

 

[Happy_Hamer]

Bobby, I dont think the freq counter will stay in one spot on SSB but on AM it should, nature of the beast I think.

Its not actually changing freq when you talk is it?

 

[undertaker]

Bill, it seems to i cant clarify it in i did a test with my mag 257 in the brides car. changed to another radio and it was fine...

 

[dxhound]

Its quite possible that the radio needs alignment. That freq. counter should stay rock solid in any mode because unlike any in line freq counter, instead of sampling the transmitted frequency it is taking a reference freq. off the PLL and adding a set amount. I believe the reference is 10.240Mhz plus the 2.5khz ssb offset and then the freq. counter board has its own mixer that converts the incoming signal to a usable reference. I can look up the specifics if you would like and give you a better idea of what to look for. But it could be either your VCO/PLL circuitry or the Freq. counter "controller"/mixer itself. But since you say the radio is off on tx freq and no one can hear you, I would bet on the PLL.

 

[hotrod]

Its quite possible that the radio needs alignment. That freq. counter should stay rock solid in any mode because unlike any in line freq counter, instead of sampling the transmitted frequency it is taking a reference freq. off the PLL and adding a set amount. I believe the reference is 10.240Mhz plus the 2.5khz ssb offset and then the freq. counter board has its own mixer that converts the incoming signal to a usable reference. I can look up the specifics if you would like and give you a better idea of what to look for. But it could be either your VCO/PLL circuitry or the Freq. counter "controller"/mixer itself. But since you say the radio is off on tx freq and no one can hear you, I would bet on the PLL.

i agree

 

[davegrantsr]

'freq counter goes nuts' sounds more like a cold solder joint. especially if he means it just runs & runs, & not just bumping around a few hundred Hz each way.

 

[undertaker]

cannot understand radio on ssb...