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

[D C *Mac* Macdonald]

"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