20-01-2018, 07:21 AM
Hi Hayden,
I also share your concerns over Balun issues or:
Concerns with Balanced Feed and the possible radiation from the "hot"
feed cable.
The voltage at the "hot" spot depends on the antenna impedance so,
a 12.5 ohm split dipole feed will need a much lower feed voltage
than a 50 ohm LFA design (actually 1/2).
Since one always has "length" available between the feed point and
where one wants the, coax up the pole, to come to, a 1/4 wave piece
of, geometric mean of ( 12.5 to 50 ) impedance coax, eg. two pieces
of 50 ohm coax in parallel should do the trick.
Could this be the best solution?
Alan
I also share your concerns over Balun issues or:
Concerns with Balanced Feed and the possible radiation from the "hot"
feed cable.
The voltage at the "hot" spot depends on the antenna impedance so,
a 12.5 ohm split dipole feed will need a much lower feed voltage
than a 50 ohm LFA design (actually 1/2).
Since one always has "length" available between the feed point and
where one wants the, coax up the pole, to come to, a 1/4 wave piece
of, geometric mean of ( 12.5 to 50 ) impedance coax, eg. two pieces
of 50 ohm coax in parallel should do the trick.
Could this be the best solution?
Alan