With some ikky rainy weather here in La, decided to try out a Jackite
lifted 31 ft vertical with the T1 autotuner remotely located at the base.
A couple of homebrewed bias tee units carry a control signal to the T1.
Working very nicely. Have made some nice QRPp contacts on 12, 17, and 20
m this afternoon. I set the K2's autotuner to CALS so as to let the T1 do
the work.
Simple and easy would have been a SPST momentary switch at one end of a
shielded cable, but I opted for the "complex and wonderful" instead :^))
Bias tee at the antenna end has an optoisolator whose open collector goes
to the T1 control jack. The rig end's bias tee has two 3 V coin cells,
the switch, and a resistor. Testing return loss with a TAPR VNA gave
VSWR nicely around 1.1 from 3 to 30 MHz with a dummy load on the far end
bias tee. The whole outside end affair is inside a watertight box
obtained at the WalMart camping dept, with a couple of O-ring sealed BNC
bulkhead fittings to get the cables in and out.
73,
Jim, N5IB
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