Topbanders,
i set up a K9AY-Loop over the weekend and currently am testing it.
I had nice Q's with W9ZR and VE3JM saturday night ,
both Q's were a joy with the signal wandering from one ear to the other.
I use a K3 with SUB-RX for the loop and a 1/2 wave dipole for the Main
RX/TX.
Sunday afternoon i added 3 Radials for each leg of the loop and a short
ground rod, abt. 1m only.
There was no improvement , it made things worse instead . Well at least
i feel so.
Without the radials and ground rod, i feel that the directivity is a lot
better. OTOH, on AM-BC, the directivity is impressive with the ground
rod and radials.
What is going wrong?
Is the size of the loop critical? Mine is a bit bigger (abt 2 or 3m)
than the original design by K9AY cuz i goofed with the math...
The coax is not grounded at the switch-box (it shouldn't be, right?).
The radials are just as long as the leg of the loop,
one is under the wire , 2 more split about 30-40 degrees each side.
If i optimize the Resistor for best Null, will it work for topband only?
All input welcome.
--
73,
Martin DM4iM
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UR RST IS ... ... ..9 QSB QSB - hw? BK
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