[ARC5] What is a "radio range filter"?

[D C _Mac_ Macdonald]

Thanks for that URL, Jon! 
 
And I DID post a correction to my 26 April post's typo of 60 instead of 50 Hz.
 
* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* Oklahoma City, OK * 
* USAF, Ret'd 61-81 * 
** FAA, Ret'd 94-10 * 
* * * * * * * * * * * 
 
 
> Date: Wed, 27 Apr 2016 14:48:07 +0000
> From: joldenburg2 at new.rr.com
> To: gzook at yahoo.com
> Subject: Re: [ARC5] What is a "radio range filter"?
> CC: arc5 at mailman.qth.net
> 
> It appears that 25hz is still in use in industrial app's in the Niaagra Falls area:
> 
> http://electrical-science.blogspot.com/2009/12/history-of-power-frequency.html
> 
> Jon AB9H
> ---- Glen Zook via ARC5 <arc5 at mailman.qth.net> wrote: 
> 
> =============
> Methinks a typo!
> 
> Virtually every part of the United States uses 60 Hz power! Glen, K9STH Website: http://k9sth.net
> 
>       From: D C _Mac_ Macdonald <k2gkk at hotmail.com>
>  To: Richard Knoppow <1oldlens1 at ix.netcom.com> 
> Cc: ARC-5 Mail List <arc5 at mailman.qth.net>
>  Sent: Tuesday, April 26, 2016 3:17 PM
>  Subject: Re: [ARC5] What is a "radio range filter"?
>    
> I never heard of any US area that used 60 Hz power but areas around Niagara Falls used 25 Hz as late as 1950s!  Mac, K2GKK/5
>
 		 	   		  
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