The losses pile up for those running QRP or QRPP. I have
frequently thought that a QRP system which has the final
amplifier at the feed point of the antenna would be very attractive.
A crude way of accomplishing a feed point amp would be to take a
radio like the Rockmite and place it at the feed point. If you
run the Rockmite with a 9V battery, all you just need wires for
the paddle and the headphones.
The big problem as I see it is weight at the feed point. In
theory, you could handle the whole operation with a RG-174 feed
line. Run DC power on the feed line, and have the feedpoint
electronics switch between transmit and receive depending on the
signal level on the coax.
But this is just another of the projects lined up to fill the
time when I'm not operating.
73 Bill AE6JV
On 2/11/18 at 11:49 AM, alor...@sbcglobal.net (Al Lorona) wrote:
I encourage you to do an analysis to determine your system
efficiency. I recently did so and discovered that I have a
worst-case loss (to the feedpoint up at the antenna) of 1 dB,
which is 21% of my power. Gone. Forever. Whoosh!
---------------------------------------------------------------------------
Bill Frantz | Re: Computer reliability, performance, and security:
408-356-8506 | The guy who *is* wearing a parachute is
*not* the
www.pwpconsult.com | first to reach the ground. - Terence Kelly
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