For example, transmitting on a 20 meter beam while listening on a 15 meter beam.
How great is the risk of damaging the front end of a receiver listening on one
beam while transmitting on a second beam
when both are close spaced?
I used EZNEC briefly and was surprised that a parasitic element of the same
dimension results in current in the parasitic
almost as high as the driven element (for a spacing of about 4 feet) .However,
changing the parasitic length to another band
dropped the current down to about 20 % of the driven element.
But I don't have any idea of the relationship of current in the parasitic
element to that obtained when the parasitic element
is actually the driven element on another beam. I tried putting a 50 ohm load
in the parasitic element and that dropped
the parasitic element current even more.
But, since the frequency of the signal on the 15 meter beam is 20 meters, I
presume that the SWR is high and a
voltage amplification may result depending on the transmission line length.
BTW, I would be using Dunestar filters on both rigs, but am concerned about
inadvertently not having the filter turned
on at some time.
looking forward to explanations
k7puc
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|