Knut,
The easy way is to add two wires for 80 meters to either of the resonant
dipoles (using the same coax). If you orient the 80 meter antenna wires
at right angles to the existing antenna, there will be no interaction.
If you cannot get them at right angles, then separate the wires as much
as you can and re-tune the higher frequency antenna.
I run 3 such "fan dipoles" here. One for 80 and 40, another for 20, 15,
and 10, and yet another for 30, 17 and 12 meters. The 80 and 40 meter
antennas are inverted Vee while the others are straight dipoles. The 80
and 40 wires are at right angles while the wires for the others are
separated by about a foot - PVC is used for the spacers.
73,
Don W3FPR
On 1/17/2013 5:22 PM, ab2tc wrote:
Hi all,
I apologize if this is a little bit OT, but it isn't really. My remote
KAT500 is currently maxed out with a G5RV and two resonant dipoles for 10m
and 15m (all working great). I am looking for an easy way to add my 80m
resonant dipole to the mix and have decided that building a diplexer that
would enable me to share one port for the 10m and 80m antennas should be an
easy way to accomplish this. Design programs for these are easy to find and
basically tell me that I need two inductors about 1.1-1.2uH. What toroid
core should I choose for bulding an efficient inductor like this that would
handle at least 500W on 3.8MHz and 28.5MHz?
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