[Boatanchors] Microphone assistance

[Dave Brown]

A studio mike is probably 600 ohm balanced -your hi-z input will 
obviously not be balanced. There's probably no reason why you 
shouldn't just ground one leg of the mike output and connect the other 
directly to the hi-z input. Perhaps with a 600 ohm load in shunt with 
the hi-z input if we are being pedantic.  There are such things as 
lo-z-to hi-z mic xfmrs but unless you have a long run of cable that 
will pick up hum/noise by grounding one leg there should be no 
problems and no need to use one.  OTOH, connecting a hi-z mike to a 
lo-z input is more problematic and WILL require an impedance matching 
preamp.
 73
 Dave, ZL3FJ



----- Original Message ----- 
From: "david knepper" <collinsradio at adelphia.net>
To: <amradio at mailman.qth.net>; <boatanchors at mailman.qth.net>
Sent: Friday, September 01, 2006 8:29 AM
Subject: [Boatanchors] Microphone assistance


> 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
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