Hi Roger!
Well done! You are booming into
Biggleswade! You used to be in the -20db and below zone now its -11 and
better. Uber QRO and you make me look very QRPp!!
My problem is down to lack of vertical
height (5.5M) and lousy earth (50 ohm at a guesstimate). I’m going to
ask Santa for 2 sets of swaged poles to give me 40’ height and then run a
lot more earths and radials out. With that I calculate I can go from about 0.1%
eff up to 2% and get abt 500mW erp.
With best regards
Jim
Dr. James Cowburn G7NKS
Today I modified my 500kHz antenna. The 28MHz halo up at the top of the
5-6m vertical section (which was the coax feed to the 28MHz halo) was removed
and replaced by a spiral inductance/ top capacity hat consisting of around
around 8 "spiralling in" turns in the space occupied by the original
halo. Seeing my initial reports from M0BMU I am some 5-6dB stronger
than I was before, I guess because more of the antenna current is in the
vertical section. The measured antenna current is not much different though.
Please listen for me on 500kHz WSPR
and let me know if I am now stronger than before.
73s
Roger G3XBM
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G3XBM GQRP 1678 ISWL G11088
