[AMRadio] Microphone assistance


david knepper collinsradio at adelphia.net
Thu Aug 31 19:57:37 EDT 2006


The response was overwhelming.

Thank you all.

Dave, W3ST
Publisher of the Collins Journal
Secretary to the Collins Radio Association
www.collinsra.com - the CRA Website
Now with PayPal
CRA Nets: 3805 Khz every Monday at 8 PM EST
and 14255 every Saturday at 12 Noon EST
----- Original Message ----- 
From: "Jay Adrick" <jadrick at cinci.rr.com>
To: <amradio at mailman.qth.net>
Sent: Thursday, August 31, 2006 7:46 PM
Subject: RE: [AMRadio] Microphone assistance


>
>
> ---------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 31 Aug 2006 16:29:10 -0400
> From: "david knepper" <collinsradio at adelphia.net>
> Subject: [AMRadio] Microphone assistance
> To: <amradio at mailman.qth.net>, <boatanchors at mailman.qth.net>
> Message-ID: <013d01c6cd3c$1e4b21d0$6501a8c0 at david2e3ehqtvj>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> Can anyone assist me in converting a low impedence microphone to high
> impendence.  I bought several 600 ohm studio microphones (plastic housing)
> that come with a 9 foot cable and microphone plug.  I am interested in 
> using
>
> the microphone with a high impedence input transmitter on AM.   Any
> suggestions?
>
> Perhaps, I should use a mixer unit that has low impedence input with a 
> high
> impedence output.
>
> Thank you
>
> Dave, W3ST
> Publisher of the Collins Journal
> Secretary to the Collins Radio Association
> www.collinsra.com - the CRA Website
> Now with PayPal
> CRA Nets: 3805 Khz every Monday at 8 PM EST
> and 14255 every Saturday at 12 Noon EST
>
>
> Dave
>
> You need to properly match the low impedance broadcast microphone to you 
> Hi
> Z rig input using a matching transformer. The solution that I have used 
> here
> is a Heil Sound transformer that I picked up at the local ham store for 
> $15.
> It has a 600 Ohm winding and a 30K Ohm winding, is small in size and is
> rated a microphone rather than line levels. My low Z sources work great 
> into
> the S-Line using the transformer built up in a small diecast box with
> connectors.  I have one version for microphone level input and another 
> with
> a 60db pad in front of the transformer so that I can feed the rig with the
> broadcast audio chain
>
> Check Bob's web site and you will find the transformer listed under his
> microphone accessories.
>
> I run a Harris broadcast audio console and professional processing here 
> and
> have also used the transformers to match HI Z microphones into the
> microphone inputs on the console.
>
> All the best
>
> Jay   K8CJY
>
>
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