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Cobra 29XLR NO TX

Posted: Thursday 10th Oct 2013, 14:06
by ronjr1177@yahoo.com
Radio Make and Model: cobra 29xlr
PCB Number: uniden
PLL Number: upd858
Test gear available: radioshack test/pwr meter fluke multi tester
Symptoms: no transmit

What is working: everything but transmit

What has been tried: relaced driver and final with new,test tr8 test good,tx alingnment/tweak tx coils a bit then back

Did it suddenly happen ?: yes
Anything else that may be of help?: bought on ebay ,I think this radio may have gotten wet at somepoint as it is from Louisiana a flood ridden state

Re: Cobra 29XLR NO TX

Posted: Saturday 12th Oct 2013, 10:19
by hamradiotech
Does the radio go into TX when keying your microphone?

Re: Cobra 29XLR NO TX

Posted: Monday 14th Oct 2013, 15:18
by ronjr1177@yahoo.com
Yes it goes into transmit and you can hear a slight high pitched squeal,i am going to try changing tr8 from parts radio will get back to you..

Re: Cobra 29XLR NO TX

Posted: Tuesday 15th Oct 2013, 9:21
by ronjr1177@yahoo.com
Tried changing tr8 and still nothing,going back in circuit and test more components.

Re: Cobra 29XLR NO TX

Posted: Tuesday 15th Oct 2013, 11:25
by hamradiotech
Check TR14 and see if it is switching?