[Towertalk] (no subject)

[w7am@juno.com]

Hello OM's!

I ask your input, ideas and suggestions for feeding and matching a
triband boom as a 40 meter rotary dipole.

Here, my 24 foot TH7DXX boom will be at 61 feet on a tubular, crank up,
tilt over tower.  So I do not have the option of tuning a matching
network while atop the tower.  For me, modelling is not a viable option
either.

What could be done with the tower cranked down to 29 feet?  A temporary
1/2 wave feed line plus a temporary length of ladder line with a variable
capacitor at the bottom to determine gamma capacity?

Preference is a slanted gamma rod of  RG-8 sheath with vinyl cover
slanting from a boom attachment about 8 feet from the mast up to a
waterproof box on the mast.

Would there be any advantage dangling 2.3 foot wires from each end of the
boom to bring resonance up to 7mHZ?

I would very much like to hear what techniques others have used together
with gamma rod length and gamma or omega capacitor values.

DX forever!

73,
      Allen Robbins W7AM