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.
73
Bob, K4TAX
----- Original Message -----
From: "Richards" <jruing@ameritech.net>
To: "Discussion of Ten-Tec Equipment" <tentec@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.
Background:
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
ground.
KOSS won't tell me anything about the wiring
scheme.
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 ---------------------
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|