[Milsurplus] BROFICON?

[Albert LaFrance]

Interesting topic!  Yes, I recall a discussion of something along those lines on the Cold War Comms
list a while ago.  As I remember it, a broadcast engineer at a NYC station noticed fluctuations in
his meter readings which indicated a low-speed modulation of the station's signal, and learned that
it was for national-security traffic of some kind.

Jack - would it be OK if I forwarded your message to the Cold War Comms list
(http://groups.yahoo.com/group/coldwarcomms)?   I will, in turn, re-post any replies on this list.

Albert LaFrance

----- Original Message ----- 
From: "Jack Antonio" <scr287 at sbcglobal.net>
To: <milsurplus at mailman.qth.net>
Sent: Tuesday, May 09, 2006 11:28 PM
Subject: [Milsurplus] BROFICON?


> Hi all
>
> On a professional mailing list I'm on, the subject
> of sending data over AM radio stations by very narrow
> shift FSK of the carrier came up, and one such use
> was something called BROFICON, which supposedly
> stood for Broadcast Fighter Control.
>
> Apparently, AM stations could relay slow speed
> teletype using very narrow shift FSK of their carrier,
> and could relay messages up and down the chain, one AM
> station monitoring another.
>
> I have heard of usages of FSK of AM carriers for
> things like power company load control and the like,
> but this was the first I've heard of an actual message
> relay system.
>
> Anyone ever hear of this?
>
>
> Jack
>
> Jack Antonio WA7DIA
> scr287 at sbcglobal.net