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

[mstangelo at comcast.net]

Amtrak uses 25 hz for traction power:

<https://en.wikipedia.org/wiki/Amtrak%27s_25_Hz_traction_power_system>

The NY City subway used 25 hz. I remember the incandescent bulbs flickering.

They converted the 25hz to 600volts DC via rotary converters for traction power. They have solid state converters today I believe their power feeds are now 60hz.

Mike N2MS 



----- Original Message -----
From: Glen Zook via ARC5 <arc5 at mailman.qth.net>
To: D C _Mac_ Macdonald <k2gkk at hotmail.com>, Richard Knoppow <1oldlens1 at ix.netcom.com>
Cc: ARC-5 Mail List <arc5 at mailman.qth.net>
Sent: Wed, 27 Apr 2016 12:49:43 -0000 (UTC)
Subject: Re: [ARC5] What is a "radio range filter"?

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 in OKC, OK