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Old September 22nd 03, 03:13 AM
Dale Parfitt
 
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mike wrote:

When researching the cost of high impedance coax as a feedline, it
apears globs of coax induced capacitance seriously degrates the
ability to tune the circuit. Under these conditions, resonating
frequencies requires extremely low inductance values.

How do people get around this problem in a receive only situation?

thanks,

mike


Another solution is a step down Z converter at the short antenna's
base. Typically a gate input FET stage- provides a bit of gain, but more
importantly, lowers the impedance. Then the issue of IM must be dealt
with if it is a heavy RF environment.

Dale W4OP