[Elecraft] Counterpoises and Grounding

[Stan GW3SRM]

I note that the subject of counterpoises has been debated many times in this
forum but I have not seen the subject of tuneable artificial grounds
discussed. As no doubt many are aware, operating from a location remote from
the ground has its problems in ensuring effective grounding, especially with
end fed wire antennas. I have this problem as I operate from an upstairs
shack. I have overcome the difficulty by using a tuneable counterpoise
arrangement in conjunction with my end fed wire antenna. The EFW antenna is
approximately 66ft (20m) long and the counterpoise wire 16ft (5m).

Using my homebrew AGT and my KX3 is a simple process to tune for resonance.
a) Tune to the desired frequency using the internal KX3 auto tuner. b) Tune
for maximum current using the AGT meter (low power recommended for tuning).
Repeat the process as necessary to obtain best match. Usually 1:0 or 1:1
(KX3 reading). I only operate with 5 or 10 Watts. Apart from overcoming
grounding problems you get a resonate grounding system not an approximately
resonate one as used in most circumstances. This in my view, is a suitable
compromise in overcoming difficult grounding conditions, although I do not
advocate it in preference to an extensive grounding system where conditions
permit. One point to note is that if an external power supply is used the
output must be isolated from ground and suitable precautions taken against
lighting strikes. Many designs for simple homebrew AFT projects are
available on the web and MFJ also do one commercially. Obviously different
or different multiple lengths of counterpoise wires can be used to get the
best setup with your antenna.

 

73 Stan GW3SRM