[ARC5] Fwd: [R-390] FS: Radio Filter FL-30-M

[Michael Bittner]

Also,1020 Hz is the 17th harmonic of 60 Hz.  Made it easy to synchronize 
with the power line in the days before accurate oscillators.  Mike W6MAB

----- Original Message ----- 
From: "D C *Mac* Macdonald" <k2gkk at hotmail.com>
To: <k1lky at earthlink.net>; "ARC-5 Mail List" <arc5 at mailman.qth.net>; 
<subs at w1rc.net>
Sent: Friday, November 13, 2009 4:58 PM
Subject: Re: [ARC5] Fwd: [R-390] FS: Radio Filter FL-30-M


>
> "RANGE" is a narrow filter centered on 1020 Hz, if I recall, or whatever 
> tone
>
> was used for the Morse I.D. on range and LF beacon transmitters.  "VOICE"
>
> and "BOTH" should be self explanatory.
>
>
> Somewhere back in history, research supposedly showed that the average
>
> human's greatest sensitivity to sound was at 1020 Hz.
>
>
> They were used in many aircraft.
>
>
>
> 73 - Mac, K2GKK/5
>
> (Since 30 Nov 53)
>
> Oklahoma City, OK
>
>
>> From: k1lky at earthlink.net
>> To: arc5 at mailman.qth.net
>> Date: Fri, 13 Nov 2009 18:21:35 -0500
>> Subject: [ARC5] Fwd: [R-390] FS: Radio Filter FL-30-M
>>
>> A friend has an FL-30-M for sale. Email him for more details:
>>
>> "Michael, W1RC" <subs at w1rc.net>
>>
>>
>> .. the thing has a switch on it, so *might* be the switch for the
>> FL-30 and not the filter.. I dunno.
>>
>> Begin forwarded message:
>>
>> > From: "Michael, W1RC" <subs at w1rc.net>
>> > Date: November 13, 2009 5:19:15 AM EST
>> > To: Roy Morgan <k1lky at earthlink.net>
>> > Subject: Re: [R-390] FS: Radio Filter FL-30-M
>> >
>> > Hi Roy:
>> >
>> > I... it's a box about 2" cube with one switch marked RANGE VOICE
>> > BOTH on it.
>> > ...
>> > Thanks,
>> >
>> > 73,
>> >
>> > Michael
>> >
>> > At 08:47 PM 11/12/2009, you wrote:
>> >> Is that like the FL-5 range filter? I seem to remember a discussion
>> >> about them on the ARC-5 list not long ago. That is the place you'll
>> >> sell the thing the fastest, I'g guess. I'll post a notice for you if
>> >> you like.
>>
>>
>> Roy
>>
>> Roy Morgan
>> k1lky at earthlink.net
>> 529 Cobb St.
>> Groton NY, 13073
>> Home: 607-898-3607
>> Cell: 301-928-7794
>
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