[Mobile-Portable] Screwdrivers and whips
David
iam at pmug.org
Sat Jan 18 01:17:19 EST 2014
You are right!
I wasn't wise. I should have done my antenna efficiency studies BEFORE I
spent all that time and energy on the whip & tuner installation. BUT,
going back to the screwdriver cured the problems.
David
W7DBH
** The K0BG site is like a Handbook for HF mobile operations. Whether or not
** you believe an efficient HF mobile station can be built on-the-cheap, you
** are sure to find some good tips and practical info of various
** installations here.
**
** My own experience is that the ~108" whip with auto tuner is relatively
** stealthy (as stealthy as a 108" whip can be), but , even when installed
** high
** up, has poor radiation efficiency on freq's below about 14 Mhz. The tuner
** will make the transmitter happy but a lot of energy is being lost into the
** ground and vehicle chassis, and not going into the ether where it belongs.
**
** Of course you can make contacts at 40M and 80M (even 160?!?) with a whip,
** but the reality is a tuned antenna with an excellent vehicle ground
** distribution (and no noise) will give you 3-6 dB or more radiation
** efficiency.
**
** As with all things, your mileage may vary.
**
** http://www.dxzone.com/cgi-bin/dir/jump2.cgi?ID=12686
**
** 73
** de k0dan
**
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--
David B.
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