Cobra 2000 Mic Gain Issue

[Raccoon]

I have an old Cobra 2000 GTL that means a lot to me . It was once my grandmothers , and I inherited it after she passed a few years ago . It sat for a few years before she passed , and then it sat for a few more years before I inherited it . I did run it for awhile without any issues , but then all of a sudden it started acting up , so I sent it to the local "Radio Doctor" and he took care of it's issues . But now it's mic gain is acting up . At around the 9 or 10 o'clock position it seems to be fine , but my audio is obviously low ... so when I start taking it up higher to around the 11 or 12 position , it gets garbled sounding , and not understandable . Which mostly happens on the words that have a bit more punch to them when pronounced . I tried researching it online , but I haven't been able to find anything anywhere with anyone that might have had some sort of a similar issue .

Maybe it's a dirty , or bad pot ... it may even possibly be the mic . It's a new mic , but it isn't a higher end mic like an Astatic or a Turner . Could it possibly be something a little more involved ? I can generally work on my own equipment . But if it's something more involved that requires test equipment ... than it's back to the radio doctor for it .... lol

I'm just wondering if anyone might have any ideas as to what might be going on .

[Sandbagger]

Jun 17, 2021 23:35:28 GMT -5 Raccoon said:

I have an old Cobra 2000 GTL that means a lot to me . It was once my grandmothers , and I inherited it after she passed a few years ago . It sat for a few years before she passed , and then it sat for a few more years before I inherited it . I did run it for awhile without any issues , but then all of a sudden it started acting up , so I sent it to the local "Radio Doctor" and he took care of it's issues . But now it's mic gain is acting up . At around the 9 or 10 o'clock position it seems to be fine , but my audio is obviously low ... so when I start taking it up higher to around the 11 or 12 position , it gets garbled sounding , and not understandable . Which mostly happens on the words that have a bit more punch to them when pronounced . I tried researching it online , but I haven't been able to find anything anywhere with anyone that might have had some sort of a similar issue .

Maybe it's a dirty , or bad pot ... it may even possibly be the mic . It's a new mic , but it isn't a higher end mic like an Astatic or a Turner . Could it possibly be something a little more involved ? I can generally work on my own equipment . But if it's something more involved that requires test equipment ... than it's back to the radio doctor for it .... lol

I'm just wondering if anyone might have any ideas as to what might be going on .

This is another one of those issues which could have numerous causes and it's difficult to narrow it down without seeing it up close and personal. I do know that that particular radio will be victimized at some point, by the faulty 10V electrolytic capacitor issue that plagues so many 80's vintage Uniden made radios. My 2000 had a squeal issue with the mic gain above 10 O'clock, which turned out to be one of those 10V bypass caps. Not saying that this is the cause of your problem, but it is something to consider.

[2600]

Did I already ask you if the meter lights pulsate when the radio sounds like this?

On another forum, maybe?

An issue with the power supply would be a likely cause, if you're seeing dimming or pulsing of the meter lights.

And if you have a DC power supply you can hook up to a mobile power cord, try that. If it only distorts when being powered by the internal power supply, this would be valuable to know.

73

[Raccoon]

Nomad , I'll try it out on an external power supply this weekend and let you know how that goes , thanks for the idea .