Hello there again....my thanks to k2av guy and pete ny2r for contributing to
the most interesting subject..I saw an opportunity arising with the building of
this workshop to contribute to the efficency of my station, I knew there was a
learning curve involved but did not realise how little I knew...it takes me a
little while to interpet what I have been told, but because of the clear and
consise manner it has been explained my knowledge has grown
considerably...there are one or two points I would like to expand upon so I
hope that guy k2av would be good enough to help out...guy my "need" as you
describe is non hemispheric, so as you describe I will pull the two radials to
opposite quadrants, and will cut them to meet the impedance requirments....if
you recall my roof structure is of the pitched or angled variety with a pitch
of 20 degrees, to facilitate the opposite quadrants of interest to me, the
radials will be following the pitch of the roof and dropping the 20 degrees,
is this a disadvantage? perhaps it does not matter when as you say the radials
are only there to act as a current sink to complete the feed point
connection,there is another factor perhaps worth considering here the building
is 40 feet by 30 feet, the longer part being the "ridge" level or horizontal
part, another thing concerning me and I have read different opinions on the
subject is how high should the feed point be above the roof structure some folk
say as close as possible, but another thought is, if above the roof somewhat
the angle of the radials can be varied to effect feed point impediance... again
this will proberbly not apply in this case...my instinct is to try and take
advantage of the situation I have with this proposed structure "workshop" and
its metal roof, 40m seems to be ideal, but not having anything worth while for
80m, I am wondering if a vertical covering two bands is feasible and what
advantages or disadvantages there is in such a structure.
reguards to all george
gi0vgl....
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