Uniden Grant xl odd rx

[LeapFrog]

It did not have factory talk back. I installed the resistor across the jacks. This brought full audio to the ext speaker. It’s switching from cb to pa mode but I’ll look at it again. Question if c77 is shorted, would the audio on the pa side still work as it should? It is a tantilium cap.

I was having the same issue on my Grant XL, it ended being the ext. speaker jack!

 

[OldTech03]

Working on a grant xl for a friend of mine. This one has the 8719 chip in it and has had the 10khz channel mod done to it. It came to me with the complaint of no/weak rx. Checked the caps and double checked the channel mods. All seems ok. Here is the issue, it will rx like normal if you have a speaker hooked into the pa jack. No tx when in pa mode but it is working. No resistor across the jacks either. Any ideas? The hi/lol switch and bright/dim switch was used for the channel mod.

It seems the radio is receiving just fine so maybe it would be of benefit to treat it as an audio issue. A good place to start is at the PA switch it's common to both ext. spk jk and the pa jack. If you have an audio signal tracer or scope it's a simple matter to follow the audio to the jacks from the PA switch. It seems from all that i have read on the response to this issue it clearly is a bad connection either in common closed contacts in one of the jacks or the board. You could even use an old extension speaker with an probe isolated with a small cap to trace it. Ok I'm finished hope this helps.

Vintagetech52!

 

[OldTech03]

If it has talkback, he should get some receiver audio with the mike unplugged.

Never have had a diagram that shows wire colors. The only missing link has to be the PA switch, or the wire from the PA switch to the external speaker jack. The internal speaker gets fed from the switch inside that jack.

Bad PA switch? Would be nice if I had a XL here to look inside.

The wire from the PA switch to the external speaker jack is where I would look next.

73

I'm on your side with this one Nomad just a bad connection somewhere. How you been? have not heard or talked to ya since CBTricks bit the dust. Vintagetech52.

 

[sonoma]

Hello Oldtech03, glad you came over here. ggod to see you are still around.
I use the same name on all the forums I am on.
take care my friend.
Sonoma

 

[loosecannon]

hey VT52!

welcome to the last bastion of a good CB related forum on the net!

I have a feeling that this forum is fast becoming the "channel 19" of online CB radio.

We need more gurus over here as Nomad has to sleep sometime! LOL

hope this becomes your new online home.
LC

 

[OldTech03]

Hello Oldtech03, glad you came over here. ggod to see you are still around.
I use the same name on all the forums I am on.
take care my friend.
Sonoma

I'm using my old name as a signoff on my posts but I made a mistake on my first signup on this site and found out it could not be changed so I had to redo it. I'm getting old and careless.
..

 

[nomadradio]

So, uh...

Back to the Grant XL.

Should have suggested bridging a gator-clip jumper from the ground side of the PA jack to the ground side of the external-speaker jack.

It's a quick way to narrow down whether the audio connection is broken on the hot side or the ground side of the speaker circuit.

I'm so accustomed to just poking a 'scope probe into this sort of puzzle, that I forget there are simpler ways to answer the same question.

73

 

[OldTech03]

So, uh...

Back to the Grant XL.

Should have suggested bridging a gator-clip jumper from the ground side of the PA jack to the ground side of the external-speaker jack.

It's a quick way to narrow down whether the audio connection is broken on the hot side or the ground side of the speaker circuit.

I'm so accustomed to just poking a 'scope probe into this sort of puzzle, that I forget there are simpler ways to answer the same question.

73

Sorry Nomad, It was not my intention to create a disturbance in the force...
VT52

 

[200eazy]

Everyone thanks for your help. As it would turn out it was a broken wire in the mic. All this headache could have been avoided but I took the radio owners word that the mic was good. But on the bright side he has a newly redone channel mod and a brand new ext speaker jack.