[Amps] Boat-Anchor Cleanliness

[R at contesting.com]

On Mar 15, 2006, at 12:57 PM, Jim Kearman wrote:

>
> From: HAROLD B MANDEL <ka1xo at juno.com>
>
>> Hotel room bathrooms and kitchenettes are best for this
>> type of renovation.
>
> At my age, I recommend the single life and condo-dwelling! No yard 
> work, and no nagging. Just make sure there are ample trees on the 
> property from which to hang lowband antennas at night

Harold -- #30 phosphor-bronze wire, and black dacron (because its low 
D-factor makes it a good RF-insulator) sailmaker's thread can be used 
to construct a virtually invisible end-fed antenna that can be matched 
efficiently with an L-network.  A rain gutter downspout can be used as 
a RF-ground/counterpoise.  However, with this system, the input to the 
L-network should contain a coaxial choke balun since the common-ground 
terminals on the L-network will have some RF on them.  Plastic knobs 
and adjusting the L-network at <5W is not a bad idea - except of course 
for those who are into hellish pain and suffering.
    Since #32 is known to be able to handle 1500w pep on SSB with ease, 
my guess is that #30 is good for 3kW provided that a small loop is at 
the far end of the wire to minimize corona effect. The ideal length for 
the wire is a half-wave, or multiples thereof.  The name for a 
half-wave end-fed antenna is: Hertz.
    note -- phosphor-bronze wire is available on-line.

> (a good gutter system is useful during daylight hours -- worked YB1A 
> longpath on 40 off the gutters last week), and a conveniently located 
> 240-V receptacle.
>
> 73,
>
> Jim, KR1S
> http://kr1s.kearman.com/
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>



Rich Measures, 805.386.3734, AG6K, www.somis.org