In a message dated 9/8/01 2:33:54 PM Pacific Daylight Time, i4jmy@iol.it
writes:
<< Place a 12m director in front of the 10m driven and see what happens using
your modeling software, or roughly check how the 12m director lenght
converge to a 10m reflector using the typical formulas.
73,
Mauri I4JMY
> This 12/10M interference is a puzzling concept. k7gco
>>
The discussions were centered around a 2 element 5 band quads using
reflectors--not with directors as I recall. So far it appears it works as
others have got it to work on all 5 bands without problems with the DE's not
all tied together and using reflectors.
I can see where a 3 element 5 band quad could get real sticky and will try
it when I get time. These types of problems have been solved with wider
spacing and that is worth a try. Variable Xc's can detune a parasite when
certain bands are used. My plan to use variable Xc's in each reflector all
ganged together driven by a selsyn on the mast has 2 ways of doing it. Once
the settings are found, adjust the set screws so the Xc's are all set for
gain for F/B. Or have all off band Xc's at random settings (within 180
degrees) and detuned say on the low sides. On each band it is then necessary
to set the selsyn to a certain degree setting on each band. The rest are all
way off. There is a solution for just about any problem except crooked
politicians if you are creative enough. This should isolate the reflectors
even more. k7gco
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