[BC] Interference from FM...

[RON DOT'O SR.]

OK guys, truck me off to the reeducation camp ;).

I admit that FM can be a problem too.  So can radar.  I remember when I was 
stationed at Selfridge AFB (later ANGB) in Mt. Clemins, MI we had an FPS-35 
long range radar operating around 440 MHz with about a 300 Hz PRF.  Every 11 
seconds or so you'd hear a brrrrrupt in any radio or audio amp on base and 
over the PA system at the nearby drag strip as the radar beam swept past. 
There was no cure for it because of the power involved and everybody just 
learned to live with it.  Kinda missed it after they decommissioned the 
radar.

Ron D, Salem, OR


----- Original Message ----- 
From: "Burt I. Weiner" <biwa at earthlink.net>
To: <broadcast at radiolists.net>
Sent: Sunday, January 22, 2006 13:09
Subject: [BC] Interference from FM...


> FM operates at frequencies that do a very nice job of penetrating
> into electronics equipment.  While FM is not known for its AM
> component it generally has enough to be quite noticeable.  Just as
> annoying and maybe even more so is the "hum" that it can cause in
> audio producing equipments.  The presence of this RF in electronics
> can also cause numerous unexpected problems such as color TVs that
> are suddenly on producing black and white pictures.  Don't kid
> yourselves, FM RFI is more difficult to deal with and can be more
> disruptive than AM RFI.
>
> My opinion in fighting RFI as a result of a close FM transmitter is
> that it will probably never end as far as remedying it on the consumer's 
> side.
>
> Burt
>
>
> At 08:36 AM 1/22/2006, you wrote:
> >From: "RON DOT'O SR." <ron_doto at msn.com>
> >Subject: Re: [BC] RF interference problem
> >To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
> >Message-ID: <BAY104-DAV18449E5915A419B6EA8EBCF9110 at phx.gbl>
> >Content-Type: text/plain;       charset="iso-8859-1"
> >
> >FM stations won't cause this problem in audio equipment as there is no
> >"natural" detector in the components as there is for AM (transistor
> >junctions to rectify and detect the RF).  A very strong VHF FM signal 
> >MIGHT
> >cause buzz or hiss but is very unlikely.
> >
> >Ron Dot'o, Salem, OR.
>
> Burt I. Weiner Associates
> Broadcast Technical Services
> Glendale, California  U.S.A.
> biwa at earthlink.net
> K6OQK
>
>
>
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