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HB9ABX > ANTENN 06.01.09 18:37l 78 Lines 3030 Bytes #999 (0) @ WW
BID : KD25ZFHB9EAS
Read: GUEST
Subj: DX chasing antenna
Path: IZ3LSV<IK2XDE<F5GOV<CX2SA<DB0ANF<DF0ANN<DB0FOR<DB0SIF<HB9EAS
Sent: 090106/1633z @:HB9EAS.CHE.EU [Basel JN37TM] DP6.00 $:KD25ZFHB9EAS
From: HB9ABX @ HB9EAS.CHE.EU (Felix)
To: ANTENN @ WW
DX chasing antenna in Puerto Rico
Milton, WP4DQK in Puerto Rico sent me on the second day of this
year his experience he made with the Roomcap antenna.
He is living in the center of the island, about 30 Km away from the sea.
Interesting is his possibility, to compare the Roomcap with a full size
1/4 wave vertical, and inverted V dipols, and Long Wire antennas.
Here his e-mail:
Betreff:
Re: hb9abx roomcap
Von:
mriutort at coqui.net
Datum:
Fri, 02 Jan 2009 17:22:27 -0400
An:
Felix Meyer hb9abx <FELIX-ABX at GMX.CH>
Hi Felix:
First of all, yes I build a three roomcap antennas with your instructions.
Actually all of them are out of service because of material used for
construction. I have problem finding the PVC plastic cover material and
the one used do not resist the outdoor weather here for long time.
Any way, the antennas demonstrate a very good performance against
my normal full size inverted V dipoles, verticals and the Long Wire here.
The best signals report was obtained with the 40m band model.
I compare it side to side with the full 1/4 wave vertical and sometimes
specially during dayline time I can hear better on the RoomCap.
The report are equal but not all the times. Sometimes the full size vertical
do a better job sometimes the RoomCap.
What I know for sure is that the antenna have a very low angle of reception
or at least this appear to me. Other significant difference are the
signal to noise level that RoomCap always demonstrate better than the
full size Vertical here.
40m antenna installation:
Both antennas were on the Roof of the house. The Vertical full size one
is using the metal fence of the roof as the counterpoise, no ground to
the floor. It works like a elevate Ground Plane. The RoomCap is installed
into the roof but use another counterpoise that is smaller and
not grounded to anything.
By the way the 30m model was also installed there and both together
work very well.
It has the same ability to listen better from Europe on dayline hours.
I remember that I sometimes can copy EU station on the RoomCap
that disappear on the Inverted V dipole.
I need to say that this antennas have a very different signal capture
angle and in the dayline they can do a better DX antenna job,
even better than the full size verticals or inverted V dipoles. They also
demonstrate a better signal to noise values. I guess that the small
physical size help on this.
The QRN on the Caribbean are always strong than on other latitudes
and the roomcap help with this.
The ability of listen better sometimes during dayline time make it
necessary for chasing DX. The same way ham use different antennas
for different job, location or operating time, the RoomCap should be
include on the antenna arsenal.
...
I hope that you are in a good health this time and hope that this
new year give us a much better health. We talk about this before.
Happy New Year 2009
Best wishes / 73
Milton WP4DQK
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