yep, sounds like there are a couple wires backwards.
Usually the audio hot and ground wires if put on backwards will cause this
terrible squealing issue.
Either that, you might have the common ground and the audio ground mixed
up....
i've also found this problem happens when the microphone cartridge is
disconnected or one of the wires has come off the element itself.
if the rx and ground wires are backwards, it'll likely still receive, but
might cause this issue when you key up.
If you can't figure it out, take a swing by ebay, and find a replacement
mike for your model or radio...they can usually be had for less then 15
bucks.
73
Colin, V A6BKX
----- Original Message -----
From: "Mark" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, August 08, 2008 5:56 PM
Subject: What am I doing wrong with this microphone?
>
> Hi=20
> I am trying to wire a mike for a CB mobile. I know that the word CB =
> is like swaring but they need their mikes wired too. I have a problem in =
> that I had to rewire the key switch in the microphone head. Now then I =
> have receive working perfectly but when I key the mike there is a =
> terrible squeal. This would indicate feed back to the receiver But I =
> can't figure out where. The switch has ground on pin one, receive on pin =
> two and transmit on pin three. There are actually six pins but only =
> three appear to be needed for the project. The radio plug has Receive on =
> pin one, transmit on pin two, ground on pin three and mike audio on pin =
> four. I soldered the ground pin on the mike to the ground on the switch. =
> I soldered the receive plug pin to the receive pin on the switch. The =
> wire for the mike goes from the audio pin on the plug, to the microphone =
> element and then to the transmit pin on the switch. The transmit pin on =
> the plug is soldered directly to the transmit pin on the switch.=20
> This looks like it should work but since it doesn't. What am I =
> doing wrong?
> I appreciate everyone's advice.
>
> Thank you and God bless,
> Mark
> --=20
> Currently in Pendleton, Eastern Oregon Regional At Pendleton, =
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> gusting to 21mph=20
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> were sometimes mistaken for one another, and that's where the phrase =
> "mind your 'p's and 'q's" comes from.
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>
> =20
>
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