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Hello all,
In order to test my 136kHz TX at home, I just have
installed a toploaded wire in the backgarden.
It measured only 135pF, which is too low, because
need around 10mH to get that running on 136......
System is as follows:
2 wires each 7.5m long mounted parallel (spacing
30cm), at both ends connected together, and in
the center connected together.
From the center an about 7m long wire goes vertical
downward to the TX.
Any suggestions how to get more capacitance in the
air?
I am limited in options, because the topload has an
maximum length of 7.5m, and maximum width of 1m.
Some ideas I have:
-opening up the ends
-adding a third wire in de middle, feed it there
and then bending the rest, a kind of Z-shapped topload, center fed.
Would be happy to get 40 - 50pF extra up in the
air.......
73
Dick, PA4VHF
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