[Elecraft] elfwa revisited

[EricJ]

My last year in the Army (1965-1965) was as one of three operators at K2USA
at Fort Monmouth, NJ. We had monobanders (Telex) on 90' poles for 20-2m and
6 professional studios full of Collins and Hallicrafters equipment to feed
them.

But the most impressive and very well known antenna at K2USA was a rhombic,
one of the few amateur band rhombics in existence. It was also on 90'
telephone poles. It terminated on Europe, but could be switched to radiate
the other direction. Some late nights I would tune around 20 when it was
dead. Sometimes I would hear two VK's working each other on ground wave and
thinking the band was closed. Not for that rhombic, an S-Line and a 30L1.

Tough duty, but a soldier goes where he's needed.

Eric
KE6US

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of W3FPR - Don Wilhelm
Sent: Sunday, March 27, 2005 4:56 AM
To: Robert Conley; elecraft at Elecraft List
Subject: RE: [Elecraft] elfwa revisited

RC,

Yes - double the length and try it, a 48-56 ft random wire with a 32 ft
radial should load fine on 80 and up.  If you find it out of the range of
the KAT1 or KXT1 tuner, just extend is a few feet at a time until you
discover a length that works for you.

Thia is a 'random wire' antenna, it is not an EFLWA which is a more specific
term for antennas that are 1 wavelength or more at the lowest frequency.
The radiation pattern from an End Fed Long Wire Antenna is quite specific
and has lobes at specific and predictable angles from the wire (making it a
directional antenna) - the exact angle depends on the number of half
wavelengths of the wire.  It is this directionality that is the desirable
quality of the EFLWA, quite apart from the means of feeding it.  A really
long long wire antenna can rival a beam in its favored direction, and I'm
certain you have heard rave reports about the performance of large rhombics
which are close cousins to the long wire antenna.  There is a whole chapter
in the ARRL Antenna book devoted to these Traveling Wave antennas - they
work great if you have the space.

73,
Don W3FPR

> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net]On Behalf Of Robert Conley
> Sent: Saturday, March 26, 2005 11:47 PM
> To: elecraft at Elecraft List
> Subject: [Elecraft] elfwa revisited
>
>
> Please me revisit the EFLWA for a moment. In the KXAT1 manual page 9 
> shows a random length wire in a tree. For 40/30/20 a wire length of 
> 24-28' is recommended. Ground system use one radial cut to at least 
> 1/8 wave length on lowest band used (16' on 40m) page 10 shows a 
> Pomona model 1296 double binding post. Since I suffered an attack of 
> senility when I ordered my K1-2 (I ordered it with 80m and 40m) and a 
> KAT1. I wish to utilize a random length wire for it Should it be 
> double the KXAT1's recommendations
> (48-56') with a ground system  of 1/8 wavelength on the lowest band (32'
> on 80m)
> double that of 40/30/20m.
> tnx es 72/71
> de "rc"kc5wa
>
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