Something else you might try if you haven't already is seeing if someone
tried to wire a "talk back" (cb'er for monitor) function in that radio. Back
in my CB days some people with out the sense god gave a goldfish tried to
wire in their own circuit for that and all too often ended up with problems
like that. Usually you can tell if there's an obviously added on switch
though sometimes they'd just rewire one on the front panel, like the PA one,
or some other feature they weren't smart enough to know how to use and use
that switch for that feature.
wow, all those memories are coming back to me now and I'm sure glad I'm out
of that and the radio I still have is safely away in my closet under a few
tons of junk probably never to be heard from again.
----- Original Message -----
From: "John Miller" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, August 09, 2008 7:54 AM
Subject: Re: What am I doing wrong with this microphone?
> I'd check the plug and if there's nothing obvious there or if you can't
> find
> the problem there, maybe it would be worth while to check the switch if
> you
> haven't yet.
> ----- Original Message -----
> From: "Mark" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Saturday, August 09, 2008 1:05 AM
> Subject: Re: What am I doing wrong with this microphone?
>
>
>> 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
>>>> =
>>>> gusting to 21mph=20
>>>> Back in the day when printed material required each letter on the
>>>> =
>>>> sheet to be carefully laid out in a print box, the letters "p" and "q"
>>>> =
>>>> were sometimes mistaken for one another, and that's where the phrase =
>>>> "mind your 'p's and 'q's" comes from.
>>>> Created by Weather Signature v1.20 =95 http://www.weathersig.com
>>>> God loves you!
>>>>
>>>>
>>>> =20
>>>>
>>>>
>>>> --
>>>> No virus found in this incoming message.
>>>> Checked by AVG.
>>>> Version: 7.5.524 / Virus Database: 270.6.0/1601 - Release Date:
>>>> 8/8/2008
>>> 9:02 AM
>>>>
>>>>
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