[TenTec] Matching impedance on Argonaut 509 microphone

James Boswell jboswell at nrao.edu
Thu Dec 1 16:51:29 EST 2016

On 12/1/2016 1:08 PM, Stuart Rohre wrote:
> The Argonaut 509 bridged the shift from true high impedance mics to
> moderate impedance if memory serves.
> The best thing is to first try it.  There should be a mic gain pot
> somewhere in the rig in case you need more amplitude, but it may work
> just fine, if the mike is low impedance and is only loaded by the "high
> impedance" mike input.  It is not such a big deal in a lot of audio to
> match exactly, the impedance of two devices.  For example a speaker of 8
> ohms will work on 4 ohm output, or you could parallel two 8 ohm speakers
> to create a 4 ohm match.
> Way back in my Tech/General days, mike inputs to AM rigs were 50,000
> ohms or so.
> Later, the 600 ohm mike inputs became common.
> Some computer type mics don't bother telling you what impedance they
> are. Go figure!
> Stuart Rohre
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	The Shure 4xx series of mic work great on the Argosy, Omni-D, Delta, 
and Triton radios. I hope this helps you out.

	73'S  KA5SIW

	James Boswell

 >     James B. Boswell                           JBoswell at NRAO.edu
 >     VLA Engineering Services                   Office: 575 835-7427
 >     National Radio Astronomy Observatory       C.Phone 505 412-3732
 >     Post Office Box 0
 >     1003 Lopezville Road
 >     Socorro, New Mexico  87801

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