Michael Kennedy wrote:

"clifto" wrote in message
...
Michael Kennedy wrote:
"Sjouke Burry" wrote in message
...
In case of interference, you just have to get closer to your receiver,
for it to work.

Or get a signal amplifier, although I'm sure that is not legal.

That's it, a garage door opener transmitter with a 500-watt linear
amplifier.


My thoughts exactly. I could open my garage door from anywhere in the
state.


Have you ever looked at the circuitry in a garage door opener
receiver? No pre-amp, not much more than a tuned circuit feeding the
mixer. Some older units were TRF broadband, and used simple tone
modulation.


--
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