[TenTec] Headset connection
Bob McGraw - K4TAX
RMcGraw at Blomand.net
Tue Oct 2 07:35:54 EDT 2012
Usually with a dynamic element, as well as certain others, either wire can
be connected as + or - as you choose. Ideally and in theory, when the
diaphram is compressed one wire will be + and the other - thus the
designation. In a single element condition, frankly it makes no difference.
In a multi-element condition ideally each element should produce a positive
voltage with compression of the diaphram.
In many mike elements the voltage swing from + to - is not equal. Thus we
old AM folks find that reversing the leads of a mike will produce greater
positive modulation of the AM waveform. This is preferable. In the case of
SSB, I haven't been able to determine that it maks any difference.
----- Original Message -----
From: "Richards" <jruing at ameritech.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Saturday, September 29, 2012 8:04 PM
Subject: Re: [TenTec] Headset connection
> FOLLOW UP ---
> OK... I knew this would happen... I re-tested the whole mess, and I think
> I have a new clue:
> * One of the wires to the microphone element
> is tied to ground.
> * So... I conclude the one is mic (+) hot, and
> the one tied to ground is mic (-).
> So... NOW I suppose I need to figure how to avoid that PIN 1 PROBLEM Jim
> Brown is forever harping on ! The last thing I need is a lot of buzzing
> on the microphone input.
> So, I THINK the question becomes:
> Can I safely presume the above conclusion,
> that the mic (+) is the isolated line, while
> mic (-) is tied to the headset ground wire ?
> (Geeze I hope this makes sense to you guys... I am
> still new at this, but enjoy making stuff for the shack.)
> THANKS for any input you can provide.
> ------------------ James - K8JHR ----------------------
> On 9/29/2012 7:23 PM, Richards wrote:
>> Hi -- I am back at it... trying to match a headset to my Omni VII.
>> The headset is a KOSS 3000, originally intended for
>> Kenwood commercial handheld. It came with an
>> odd sort of "universal plug" - and I think I have the
>> wiring schema down. I think.
>> The mic capsule is hopelessly hermetically sealed
>> in the boom arm end. I can access the two lead
>> wires to perform a continuity test, but have no
>> idea which of the two wires is hot and which is
>> KOSS won't tell me anything about the wiring
>> The Question:
>> Is there an easy test one can do to with his
>> trusty multi meter to discern which lead
>> is hot and which is ground on the mic cartridge?
>> Thanks. Happy trails.
>> --------------------- James - K8JHR ---------------------
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>> TenTec at contesting.com
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