Cobra 29 wx nw st receive issue

[DaleH1985]

Recently aquired this radio. People talking further away come in just fine. However anyone within 2 miles sounds very distorted, and anyone closer than a mile is just a loud squeal. Only thing I know about this radio is the previous owner said it was peaked and tuned. Any ideas what the issue is?

 

[nomadradio]

Sounds like another case of "truck-stop super receive".

There is a trimpot VR1 near the front of the circuit board, just to the rear and inboard from the channel selector. Good chance you'll find it's cranked at one end for max receiver gain. Backing it off about 1/3 or so tends to clear this up.

73

 

[M0GVZ]

As above. The front end is getting overloaded because some dumbass doesn't understand you don't just crank everything up to 11. You'll find that once it has been aligned properly you'll suffer from less bleedover from adjacent channels too.

In the meantime until you can get it sorted just wind back the RF gain. Find an empty channel and wind it back til the S meter is on zero or just above.

 

[9C1Driver]

I would also make sure you have the soundcrapper feature turned off. It will do strange things to your receive because it only works when talking to another soundcrapper equipped station. Cobra kinda kept that quiet back then.