"R. P." <r_pol12gar@hotmail.com> wrote in message news:<rtqdnUNosI12LJHdRVn-vw@comcast.com>...
> "Doordoc" <doordoc@prodigy.net> wrote:
> > Is the transmitter one that is built into the visor or roof console or
> > is it a standard garage door opener transmitter that is normally hung
> > on the visor w/ a clip? If it is built-in I would guess that something
> > like a short is drawing off the transmitter power when the car is
> > running. If it is a stand alone transmitter the transmitter battery
> > could be weak (do not use alkaline batteries) or the transmitter could
> > be slightly out of tune and the running engine blocks out the weak
> > signal. There is also the chance that your receiver in the garage is
> > sending out a weaker signal then what it use to.
>
> I have the same old hand held garage door opener I've had before
> this problem started. It is NOT one of those newer, more secure openers
> with the rolling or encrypted code. Replacing the battery seems to make
> no difference. There must be some kind of RF interference emitted from
> the running car that seems to act as a jammer on the garage door
> transmitter and I figure it must have started after one of the regular
> service visits but I did not make the mental connection right away. I
> used to be able to open or close the garage from the street at the end
> of my driweway but now I have to work at it with the car's front almost
> touching the garage door. It's really frustrating.
>
> Rudy

So if you put the transmitter in a different car w/ it running does it
work or is the problem only there when it is in your car. This would
narrow now whether the interfrence comes from your car or if the
transmitter has a crack in the solder or loose part & it is the
vibration of the car running causing the problem as opposed to a radio
interference.

I once see a problem where if the customer parked a particular car in
the garage or driveway (without it running)all the transmitters quit
working unless you touched the receiver antenna w/ the transmitter. If
you took that one car down the street all of the transmitters worked
fine. They were also old radio controls that the problem started w/
the car battery being changed. I reasoned that the interference was
coming from his car alarm but his mechanics couldn't eliminate the
problem. After a few weeks of fighting it, we ended up changing his
receiver & transmitters to a different brand that was on a different
frequency to get them to work. (His other choice would have been to
sell the car, but he really liked the Mercedes convertible). However,
it was one of those rare occasions that no-one really new for sure
what was causing the problem.

A thought that just comes to mind. Does your car have GPS or some time
of satellite tracking system built in? If so disconnect it & see if
the problem goes away.

Doordoc
www.DoorsAndOpeners.com