I had a 707 and sold it. May buy another one just to try again. My
preference and best sounding of all mikes is the 709A.
I don't specifically recall if Tentec actually changed by design the source
or output impedance of the 707 mike or perhaps maybe corrected a published
specification. I suspect the latter.
In any event, I can't imagine producing a dynamic mike today which has a
source impedance of 50K ohms. That would require the transmitter audio
input to present something like a 500K ohm load or greater. I don't recall
a current rig on the market today that can provide correct loading for a
mike having a source Z of 50K ohms.
From a very reliable technical audio source I quote: "Matching microphone
and pre-amp impedances to the same value (power-matching) is not desirable
since it reduces both the level and the signal to noise ratio by 6dB. For
dynamic and condenser microphones, the preferred preamp input impedance is
generally about ten times that of the microphone output." ref -
http://www.sweetwater.com/expert-center/techtips/d--08/19/2004
With the spec of >10K @ 1KHz for the Orion mike input, this would then
expect one to use a mike having a source or output impedance at some value
less than 1000 ohms. This is the same as the Omni VII and the Eagle and the
Argonaut VI which have the same Microphone Input Specification being >10K @
1KHz.
73
Bob, K4TAX
----- Original Message -----
From: <Rsoifer@aol.com>
To: <tentec@contesting.com>
Sent: Saturday, December 01, 2012 11:20 AM
Subject: Re: [TenTec] 566 v3.029 and 707 Regal mic
In a message dated 12/1/2012 4:53:56 PM GMT Standard Time,
jruing@ameritech.net writes:
Subj:Re: [TenTec] 566 v3.029 and 707 Regal mic
Date:12/1/2012 4:53:56 PM GMT Standard Time
From:jruing@ameritech.net
Reply-to:tentec@contesting.com
To:tentec@contesting.com
Sent from the Internet
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