[ARC5] mike current

[D C *Mac* Macdonald]

I guess that's why so many hams would stealthe buttons out of pay phones late at night toinstall in their T-17s they used on Harvey-Wells Bandmasters and other such in the 50s!
* * * * * * * * * * *
* 73 - Mac, K2GKK/5 *
* (Since 30 Nov 53) *
* Oklahoma City, OK *
* USAF, Ret (61-81) *
* * * * * * * * * * *

 > Date: Wed, 7 Sep 2011 09:17:46 -0400
> From: aaf-radio-1 at aafradio.org
> To: pahute20 at gmail.com
> CC: ARC5 at mailman.qth.net
> Subject: Re: [ARC5] mike current
> 
> On 9/6/2011 5:43 PM, Bob Krueger wrote:
> > Any body know the carbon mike button current of the T17 mikes commonly used with the arc5 equipment?
> 
> Nominally 40mA, Bob.  That's about in the middle of the usual 20-65mA 
> range for the RS-38 and T-17 mikes used with WWII sets.  More current = 
> higher output, but also higher distortion.  Tests made in 1943 showed 
> about 40% peak distortion for the T-17 while the RS-38 had a peak of 
> about 15% at the upper end of the normal voice frequency range.  
> Distortion at 1kHz was 22% for the T-17 and 5% for the RS-38.  Carbon 
> granule cementation over the years will of course affect output.
> 
> 73,
> Mike
> 
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