PDRUNEN wrote:
What lenght of RG-58 should I use attached to this 10meter dipole to create the
highest SWR possible on 21.25 MHz?

Any length will result in the same SWR.

My thoughts here is to have two dipoles attached to one feed, the first antenna
that the signal meets is the 15meter dipole. The second antenna will be
attached after another run of RG-58.

The feedpoint impedances of the 15m dipole and 10m dipole are different
enough, you don't have to worry about much interaction. With them in
parallel at the same feedpoint, the high feedpoint impedance on the 10m
dipole for a 15m signal will force most of the energy into the 15m dipole.
Likewise, the high feedpoint impedance on the 15m dipole for a 10m signal
will force most of the energy into the 10m dipole.

On 21.4 MHz, the 10m dipole will have a feedpoint impedance of 200+j450

On 28.4 MHz, the 15m dipole will have a feedpoint impedance of 29-j384

So just parallel them, tune 'em up, and enjoy.
--
73, Cecil http://www.qsl.net/w5dxp



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