Hi Cliff,
Having been in the Navy for 20+ yrs and retired as a Chief Electronics
Technician,let me clue you into something.When garage doorvopener first came
out that could work by "remote control" from your vehicle,the frequency used
was 243.0 Mhz.This was because the old AN/URC-4 radiolocator beacons were
available on the surplus market.The AN/URC-4 is a portable xmit only beacon
that was used by downed pilots to establish their location .(it could also
xmit on 121.5 MHZ for commercial AC).
The garage door RX was basically a super regenerative receiver tuned to the
neighborhood of 243.0 Mhz which is a military distress frequency.
So your garage door opener may not work too good if you live near an Air
Force Base or Naval Air Station.
--- Original Message -----
From: "Cliff KD4GT" <kd4gt@bellsouth.net>
To: <tentec@contesting.com>
Sent: Thursday, May 20, 2004 10:50 AM
Subject: [TenTec] BPL, RFI & FCC
> Sometimes it takes a while before the actions of the FCC really come to
> light.
>
> An AP news story of 05/20/04 reports that a new Air Force radio system by
> Motorola is being tested at Elgin AFB in Florida. Homeowners in the
> surrounding area are reporting their garage door openers are no longer
> functioning. An FCC spokesperson said that 'IF' the Air Force is operating
> within its assigned frequencies then the users of the garage door openers
> will have to change theirs.
>
> Hmmm ... the FCC allowed these Part 15 devices to be produced even though
> they operate around the 435~436 MHz area. We hams have 420-440MHz on a
> 'secondary' basis with the US federal government (military) being the
> primary user. The FCC is also willing to let the RFID Tag folks crank up
the
> power well beyond the Part 15 limits in this same area.
>
> How long is it going to be before the BPL or RFID starts interfering with
> critical communications and someone dies? Or maybe the FCC will just find
a
> solution of dropping all those nifty new gizmos into the ham bands? After
> all, we are just 'amateurs' and don't really provide any beneficial return
> for the bandwidth given to us.
>
> Watching to see how this conflict between the Part 15 garage door openers
> and the US military plays out will, at the very least, be interesting.
>
> 73 de KD4GT
>
>
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