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HB9ABX > ANT 27.06.06 01:51l 38 Lines 1470 Bytes #999 (90) @ WW
BID : J1HR9JHB9EAS
Read: OE5RCO GUEST DK2ZA DL1SJN
Subj: RoomCap comparisons
Path: DB0FHN<DB0MRW<DB0FSG<HB9EAS
Sent: 060626/2345z @:HB9EAS.CHE.EU [Basel JN37TM] DP6.00 $:J1HR9JHB9EAS
From: HB9ABX @ HB9EAS.CHE.EU (Felix)
To: ANT @ WW
RoomCap in Friedrichshafen.
At the HAM Radio fair in Friedrichshafen I showed last week
this antenna to some HAMs, who could verify the results
obtainable with this antenna.
Some ot them were: Klaus, DL9SAT, Juergen, DL2ALE, Hansjoerg,
HB9PMF and more.
We were testing on 40m, comparing W3DZZ, inverted-V, and tested
the operation with the K2 transceiver in QRP.
In the comparison with the W3DZZ we received both the same
signal report. In comparison with the inverted-V the RoomCap
received one S-point better reports.
The question arises always: Why can the small antenna
be so effective ?
Here the main reasons to explain the efficiency of
the RoomCap Antenna:
- Radiation is produced between planes in the open space,
and not through wires.
- Differential, floating feeding system.
- Antenna offers real 50 ohms for all operating frequencies,
which eliminates the need of a lossy tuner.
- Minimizing of ground currents through partial elimination of
the radiation fields toward ground, resulting in radiation
direction towards the ionosphere.
- Minimal losses within the antenna: Radiation resistance in the
order of 10 times of the total loss resistance.
- No radiation from the feeding coax.
This does not mean, that this antenna is better than some big
antennas, but there is no other small antenna known, which
can produce regularly such good results in comparisons.
Felix Meyer HB9ABX
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