Checking out a new to me, Uniden Grant XL radio this evening, and plugged in a microphone that I use all the time with the Cobra 148 GTL, and get a nasty back squeal through the mic. Doing a search for mic wireing , I do not see any difference? Anything change between Malaysia and Philippine radio wireing?
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Mic wiring
- Thread starter The Howler
- Start date
Try another mic. If it does the same its probably the radio. Im pretty sure 5 pin cobra/uniden are the same.
When you say, "New to me" - Grant XL's haven't been sold for years, so if this is used, they may have installed a "Talkback" mod so they could hear themselves - but they used an Extension speaker with a variable volume control knob - which then they kept the extension speaker and so that external speaker jack is now disconnected, enables the INTERNAL speaker and you hear it - FULL Volume.
Ya' Gotta' - find that Talkback mod, - easiest way? It's to take a pic of the board top and bottom and post it here so we can help you revert the radio to a point that you don't hear that squeal.
There are a lot of ways Variable talkback can be done, so if you want it out of there, take it to a tech or post something here to let us help you solve this.
To find talkback look for a resistor across the ext speaker and pa jacks generally on the bottom of the board.
The talkback mod appears to be here. I believe thats a resistor in plastic tubing.
Unsolder one side and try your mic again.
Unsolder one side and try your mic again.
It is a resistor, and my mic works with one leg unsoldered.
Looks like I have a nice working radio!
Thanks Tokin, and everyone’s help!
Looks like I have a nice working radio!
Thanks Tokin, and everyone’s help!
If you dont want/need tallkback you can un solder the other side and remove the resistor. You can also try higher values for a softer tb volume with out the squeal.
Hey, while I was out getting Groceries, I see the forums already got you up and running...
There is a second benefit to this with what you did...
By "snapping" a photo of the board, especially the top, you now have a fixed in time snapshot of your Coils, Cans - wiring and all the whatnots that make that radio work.
So if you ever mis-tune it, or have some type of catastrophic event, if you can make it back to this site and this thread especially, you have a way to realigning that radio and recover it's ORIGINAL to YOU settings.
I think of this as a form of recovery for you in case something went wrong on your radio , you have a place to find out what you had to start with. And rebuild or reset it to that posts' point in time
There is a second benefit to this with what you did...
By "snapping" a photo of the board, especially the top, you now have a fixed in time snapshot of your Coils, Cans - wiring and all the whatnots that make that radio work.
So if you ever mis-tune it, or have some type of catastrophic event, if you can make it back to this site and this thread especially, you have a way to realigning that radio and recover it's ORIGINAL to YOU settings.
I think of this as a form of recovery for you in case something went wrong on your radio , you have a place to find out what you had to start with. And rebuild or reset it to that posts' point in time
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