Internet, you can find the RoomCap Antenna (= RCA) in many different
I have read many of them, and found that they contain many funny
texts. There are descriptions,
that bear the name Roomcap, but they have nothing in commen with my RCA
Then, there are publications which resemble very much the original, but
they contain small,
but very important errors.
Small details of the construction may be decisive for the correct
function of the
I have measured, that disregarding of small details, transmission loss
to 10dB results.
This happens e.g. with an inappropriate ground connection.
Applying the grounding rules, which are important for normal GP
antennas, lead here to
a terrific deterioration of performance.
You may even find some "experience stories" and bandwidth graphs, which
of wrongly built constructions ...
Of course, you can transmit and receive with a "faulty" Roomcap, by
renouncing to the
possible efficiency of this antenna. In practice, it is nearly
impossible to prevent, that
any wire is radiating somewhat ...
And: A low SWR says nothing about the efficiency of an antenna.
Important is however,
where the input power is going to.
Each one has to decide, what he wants.
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