Hi
Some new information on my mike trouble.. I pulled out my trusty
talking malty meter and found that when the mike is in receive mode there is
0 ohms impedance between the ground and the receive wire. When I key the
mike the impedance jumps to 3 ohms. This appears low enough that the
receiver is still engaged. I am pondering if there is a partial short in the
plug or if the issue is in the mike head. Right now I am to the point that I
want to figure out this problem just for the principle of the thing. When I
turn the mike gain down the rig has good audio.
I appreciate every ones insights.
Thank you God bless,
Mark
-- Currently in Pendleton, Eastern Oregon Regional At Pendleton, Oregon
Partly Cloudy, 77.0°
----- Original Message -----
From: "Colin McDonald" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, August 08, 2008 9:25 PM
Subject: Re: What am I doing wrong with this microphone?
> 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, =
>> Oregon Mostly Clear, Lightning Observed 91.9=B0F Wind:NW-320=B0 at 15mph
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>> gusting to 21mph=20
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>>
>>
>> =20
>>
>>
>> --
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> 9:02 AM
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>>
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