[BC] Interference from FM...

[Burt I. Weiner]

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