[Milsurplus] SIMPLE Carbon Microphone Substitute.

[Michael Hanz]

Just to provide some data points on typical WWII era military carbon 
microphones and their characteristics, see 
http://aafradio.org/docs/NDRC_Interphone_Equipment-carbon_microphone_characteristics.pdf 
There are frequency response curves that are interesting, if nothing else.

73,
Mike  KC4TOS

On 5/29/2016 5:25 PM, hwhall at compuserve.com wrote:
> N-1 elements were used in telephone switchboard boom-mike headsets 
> like the Western Electric Model 52. That Motorola mike I mentioned 
> earlier was a Roanwell made N-1.
>
> Audiosears offers a model 1628 that is their version of the N-1:
> http://www.audiosears.com/products/data/mics/1628/
> They say their resistance is 15 - 60 ohms. I think their site is the 
> only place I encountered any data on the N-1.
>
> Wayne
> WB4OGM
>
> -----Original Message-----
> From: Hubert Miller <kargo_cult at msn.com>
> To: milsurplus <milsurplus at mailman.qth.net>
> Sent: Sun, May 29, 2016 2:44 pm
> Subject: Re: [Milsurplus] SIMPLE Carbon Microphone Substitute.
>
> What’s the resistance ( or any spec ) of those tel operator headsets – 
> the early ones, not the late Plantronics style – you describe? With 
> the smaller button than the F-1
> element? I have several of those headsets around. I think the 
> headphone part is 350 ohms Z.
> Which reminds me again, i have a factory box of new F-1 elements i 
> should do something with.
> -Hue
> *From:*Milsurplus [mailto:milsurplus-bounces at mailman.qth.net 
> <mailto:milsurplus-bounces at mailman.qth.net?>] *On Behalf Of 
> *hwhall at compuserve.com <mailto:hwhall at compuserve.com>
> *Sent:* Saturday, May 28, 2016 5:07 PM
> *To:* cjack93907 at razzolink.com <mailto:cjack93907 at razzolink.com>; 
> milsurplus at mailman.qth.net <mailto:milsurplus at mailman.qth.net>
> *Subject:* Re: [Milsurplus] SIMPLE Carbon Microphone Substitute.
> >microphone from a Motorola 2-way radio
>
> I have a couple of Motorola mikes from some sort of portable 
> belt-clipped transmitters, perhaps railroad used items.  Are those 
> similar to what you were thinking of?  Their mike buttons are marked 
> Roanwell RN-1, which is the same as a generic N-1, the button used in 
> those old switchboard operator headsets (think of the Lilly Tomlin 
> telephone operator skit).
>
> Wayne
> WB4OGM
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