By all means put a wire in the middle for extra pf. but the z shape will
make no difference I think.
Make the vertical of three parallel conductors , each to the centre of each
top wire
Bryan g3gvb
----- Original Message -----
From: "Dick" <[email protected]>
To: <[email protected]>
Sent: 11 August 2006 20:45
Subject: LF: antenna: how to get max. capacity
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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