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At one point in the early 1970s, I as W8KJN was
using a balloon-lifted 5/8wl 40M vertical for an RSGB 40M contest (worked really
well). I used a war surplus balloon and wire, cutting the wire to 5/8wl and
loading it with my tuner on my USAF MARS HT4G (civilian predecessor of
BC610). My experience was that the radiating element was somewhat more stable
and vertical if the balloon was tethered upwind and the radiating element was
nominally vertical. It did sag and bounce a bit in windy conditions. Of
course, that requires the space for an upwind anchor site.
If I were to try another balloon- or kite-supported
antenna I would repeat that approach.
A neighbour's son came by while I was adjusting
things and inquired what I was doing. I replied I was fishing for flying fish
(we were by an inland lake). The neighbour was a ham and came over for the
evening and, with my wife and me, enjoyed a sip by the the glow of the
final and the mercury vapour rectifiers and the lights on the HT4G and
R-390A.
73,
Jim, VE1JF
----- Original Message -----
Sent: Sunday, August 04, 2013 2:02
PM
Subject: Re: LF: USA issued 68 to 76 kHz
band with 10 W ERP
Markus, Stefan, LF,
Please keep in mind that 10W represents an upper
limit, we are free to run anything below that!
About Quadcopters - the limitation is the life of the
battery - which is on the order of 15 minutes, even if it could lift enough
weight, it wouldn't last long! (The more weight it must lift the higher the
battery drain!)
A better solution might be a remote controlled
airship (zeppelin) where the helium supplies the lift and motors provide
steering only.
73 Warren K2ORS
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