[Scan-DC] cordless phones

[john wilson]

   I know from personal experience that baby monitors can cause extreme
RFI and reception grief.  I have 6 monitor antennas at 125 ft. on my
communications tower all pre-amped.  About 2 years ago one of my neighbors
installed a baby monitor operating on 49.830 mhz.  I had RFI harmonics at
various frequencies up to 1,000 mhz.  Last month I decided to attempt to
eliminate this RFI source.  One afternoon I saw the neighbor outside and
engaged her in chit chat.  Then I said "By the way, I am sure you aren't
aware, but I can hear EVERYTHING being said in your house on some of my
radios from the baby monitor you are using.  Also, anyone else with a
scanner radio in their car or house in the neighborhood can also hear
EVERYTHIHG being said".  She suddenly turned pale and got that "Oh s...."
look.  She ended the conversation, hightailed into her house and
immediately unplugged it as I heard nothing else on 49.830 mhz. when I
checked a few minutes later.  I wish all RFI sources were that easy to
eliminate.

Steve Rigby wrote:

> knowlton wrote:
>
> > A0015/01 - ATTENTION INTERNATIONAL OPERATORS: INTERFERENCE
> > IMPACTING AERO- NAUTICAL AIR TRAFFIC FREQUENCIES CAUSE BY ILLEGAL
> >  HIGH POWER CORDLESS TELEPHONES.
>
>    There are many "high power" cordless phones available for sale
> that operate outside of the normal commercial aircraft control
> frequencies, including phones that are FCC certified for use in the
> United States.  I would suspect that any of these could produce
> spurious radiation in the frequency ranges that are used by
> aviation, perhaps even those approved for use in the United States.
> There may even be such phones that are set up to transmit within
> the normal commercial aircraft radio frequency ranges although I do
> not know of any.
>
>    Certain baby monitors that have been FFC approved, and are thus
> perfectly legal to operate, have been found to be causing similar
> interference in the aircraft bands.
>
>    Of course, in the eyes of the law, even a certified device that
> winds up causing interference, totally unbeknownst to the user, is
> considered illegal.  Some of these interferences are probably from
> intentional illegal use of these phones, but others may be
> unintentional.  Additionally, persons visiting the United States
> from abroad, where FCC restriction do not apply, quite likely will
> bring these phones with them, and use them here for whatever purposes.
>
>    Steve
>
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