In article ,
Dick LeadWinger wrote:

My aunt, who lives in So. Calif., along with two close neighbors, is
suddenly having problems with garage door openers. Won't open. Stop
part way down, etc. I haven't heard of amateur radio having an effect
on modern garage door remote receivers. How about BPL? Don't know if
it can effect things in the 900 Mhz region, but thought I would ask if
anyone else has seen this.

BPL would not, I think, as all of the BPL systems I've heard of use HF
and lowband VHF on the power lines (and some use 2.4 gig or other
ISM-band frequencies for uplink to the ISP).

I have heard of people having serious problems with Part 15 devices
which operate in the 433 MHz region (as many garage door openers do).
The primary user of this slice of spectrum is the U.S. government...
it's allocated for radiolocation (radar) and there may be other
government communications in that band as well, I suspect. Some
months ago there were reports of people living around certain
government air bases and other installations began having
garage-door-opener blackouts, because some new radar systems had gone
into use and were interfering with the Part 15 receivers.

There might be similar problems in the 900 MHz ISM band, I suppose.

A local amateur radio operator transmitting in either the 70 cm or 33
cm amateur band might cause transient overload of a Part 15 receiver
using these frequencies. I'd expect this to be a relatively
short-lived phenomenon, unless somebody's operating a popular repeater
in your neighborhood.

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
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