- RBN - Comparison
June 2014 (upd
Felix Meyer HB9ABX
with using the RBN
Here follows the comparisons of the ROOMCAP
with wire antennas.
This comparison have done during many years.
However, many wrote,
that my announced measurings are not believed,
measurings were obtained in mode SSB, and the
reading of the values
was done manually. >>>
Read about here
Peoples, who did not
beleaved the reports, see here
27th July 2014:
In the last days I
wrote some OMs to ask,
if they are willing to
to perform more, real
help of RBN and good
and to make pictures and
They offered to assist
in more simulations with
- Do they want to know
the reality, or
do they prefer
irreality or the
Therefore, I have
performed many measurings and comparisons
with help of RBN in mode CW. I spent
many months for that.
The transmissions was in automatic
transmission, and automatic
measuring of the signal by RBN stations.
In each tests in all test sessions, and more
than 25 RBN stations
within the whole of Europe, in the
range between 140 km to 2500 km
did receive and analyse my transmissions.
of the RBN system here
The quality and
performance of an antenna can be measured in
- Measuring of SWR
- Measuring of the bandwidth with antenna
- Measuring of the field strength in the
far-field, with precision instrument
- Measuring the signal at remote listeners
through sky waves
The measured bandwidth of
the Roomcap (2nd Gen): here and here
The first 3 above parameters are important for
however, this does not say how strong your
signal arrives at distance.
Your signal can "vaporize" of your power in
- in the antenna itself
- in the ground through "ground current",
ground resistance, flexion
- in the ionosphere in low flexion (depends of
Only the real transmission to distance
shows, how good is an antenna.
Here follows a few
comparisons with RBN:
For the comparison with HB9ATX, using G5RV in
12m height, hunging free.
I was 200m next beside in the car.
During 1 hour we were sending alternating.
HB9ATX obtained 3 reports, and HB9ABX
obtained over 150 reports from RBN. Both with
100 W in CW .
1. picture =
picture = Roomcap 2.Gen, pictures from
RBN of this test.
Addition: A earlier
comparison G5RV with Roomcap from VE3UNF here with
Note: My position in the car on a city street,
next to HB9BNK
Note the SNR scale : See the db distance from
line to line.
Test began at 1800h, before was a test
transmission while the car next to my house.
Note: Die CP-6 antenna on the roof, 14m above
ground, all houses of same height, free round
What says these comparisons ?
When you see the dimension in
comparing the Roomcap with
wire antennas of 30m to 40m
length. The long wire antennas
hanging free in the height -
and the Roomcap with the 1m x
radiator, 50cm above the car!
This a real Sensation,
why the antenna experts
explained years ago, that this
be possible !!!
Here I bring the prove,
because the automatic RBN
measuring constitute a
This is the future of the
short wave antenna!
>>> See the theory to this
>>> See the calculation
Here about the antenna simulation with
EZNEC of Roomcap
HB9PJT performed the antenna simulation, where
he obtained his result:
= - 11.4
- Dipole 15m high = + 5.43 dBi
- Titanex GP
The Roomcap is bad. See antenne simulation
, I say only this one :
To delight about the beautiful curves, but
there's nothing to do with reality!
Here are his results to see and to
meanwhile found out, that the Roomcap can not be
defined in EZNEC. I use elements
that are not know by NEC ... ... )