On Wed, 07 May 2014 19:55:42 -0700, Jeff Liebermann
wrote:
On Wed, 07 May 2014 19:40:07 -0700, Jim Thompson
wrote:
My own 10m illegal transmitter and receiver and a relay... ought to
give me a full block's range :-}
...Jim Thompson
Sigh. 10m as in 28 MHz? Were you planning on operating the garage
door from the adjacent state? Transistor, tube, or spark gap? 28 MHz
requires a fairly large 2.5 meter antenna on both ends, or something
somewhat shorter with a loading coil. Even so, the aluminum foil in
the garage door, is a fairly effective barrier to RF. Move the
receive antenna outside, and the foil will not be a problem. Also,
you might want to measure the receiver sensitivity and tx power output
to make sure your range prediction is not based on bad assumptions.
I have some old 455kHz ceramic filters... maybe that's the way to do
it :-}
...Jim Thompson
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