NEW HF ANTENNA
(HB9ABX) e
RoomCap Antenna
Felix
Meyer
26th July 2005 ...
/
updates: ... 7.April 11 , 12th August 11 , 10th
Nov
11 , 20th Dec 11
There
are
the last
updates available for the construction
guide.
Date of update = August
12,
2011
>>>
Read details
here
The last
demonstration of the antenna was here:
27th.
October
2007 in ZOFINGEN - here a picture
and one
more
at the "Surplus
Party", the largest HAM Radio fair in Switzerland
Unfortunately,
I could not participate in the 2008 Surplus Party.
Technical specifications of the new HF ANTENNA:
-
The new HF Antenna has the following specifications:
The name of the antenna is ‘RoomCap
Antenna’ (from Room Capacity)
and is for use on the 10-15-20-40-80 m
(+WARC) bands.
(UPDATE 20.8.06) and for 160 m
(radiator tube 75
mm and 3 m long).
The radiator of the antenna consists of
an element in the form of a tube
of 5cm diameter and a length between 50
to 170 cm, depending on the
frequency, with an additional 25 cm
length (approximately) for the connection
and mechanical mounting
space.
The feed impedance of the antenna is 50
Ohms, and it does not need a tuner
to reach an SWR better than 1 : 1.1 on
all bands.
With the remote frequency adjustement
RFA (inside the tube), any frequency of
the band can be set to SWR 1.0 in a few
seconds.
The radiation pattern in the H-Plane is
a circle and in the E-Plane has a broad
minimum upward, while the radiating beam
is flat to the side with
maximum radiation angle between 15 to 25
degrees (depending on
frequency and height above ground) = low
angle radiating antenna.
Polarisation of the antenna is vertical.
The antenna can be built as a monoband
antenna, or as a 2 or 3 band antenna
(for some bands).
Area of application:
1. Mobile antenna with exceptional
efficiency which barely can be surpassed.
2. Fix or portable antenna,
as antenna does not need a support to hang up wires
in the
air, and works at low height with highest efficiency.
Transmit power: The antenna is designed
for 200 W PEP.
By observing the special hints, the
antenna can be built for 1 KW PEP.
The efficiency of the antenna is
extremely good in comparison to
other antenna types. The comparisons can
be found in the following test reports.
It is not
the intention, to replace other, large antennas. This antenna works by
using
small dimensions as a very efficient antenna, without the need of
supporting poles,
what, by using
traditional antenna design, is not possible.
Read the explanation June 29th 2006 (towards
end of this page).
The Construction Guide
is ready.
>>> Information to
order the
construction guide: HERE
<<< (click) with
new
important info
Attention:
The following test report is no claim. This is simply a description of
the
experiences
and the contacts made with this antenna.
All data can be verified, as date, callsigns, and frequencies of
contacts are indicated.
Everybody is invited to participate personally in the tests here.
Here is the picture of the new HB9ABX Antenna for 40
m, antenna is 1.5
m long:
Many thanks to Samy, HB9BPP for the picture!
The
antenna
serves
as
excellent
Mobile
Antenna,
but
also
as
Home
Station
Antenna!
The antenna is a band antenna, which I would like to call "capacitive sky radiator",
therefore the name RoomCap Antenna.
The time is over, where one needs a big
antenna to produce a big signal.
This small antenna equals the performance of the large GPs as Cushcraft
and Butternut!
TEST REPORTS
in chronological sequence
State: 7th June
2005 (LINK added 15th December 2005)
Fantastic results obtained with new small antenna.
The last days I was testing my recently developed antenna on 40m, in mobile use.
The tests were performed by comparing signals with the following
antennas:
FD-3,
G5RV,
4-BTV
Groundplane
and
Butternut
HF-6V
(=
6-Band
Vertical).
All stations were operating with 80 to 100 W in the local area of 12 km
to my mobile station.
I was using the TS-50 with max. 100W operating on the car battery.
The comparing tests were always in the same QSO with frequent
changeover between the
comparing station and the mobile station.
In
total, 38 Test
QSOs were conducted, where the
mobile station received a better
signal report in 32 QSOs from the
Remote Station, in 4 QSOs the signals were equal, and
in 2 QSOs the Comparing Station was
stronger.
The Remote Stations were in Germany
(Stuttgart to north coast), France, Italy,
Austria, Isle of Corsica, UK, and the
Netherlands.
Mostly, the mobile station received a
signal report 1 to 2 S-points stronger than
the comparing station, and some
reports were 20 dB stronger than the comparing station.
The feet of the mobile antenna was on
the car, 1.5 m above ground, and the length of the
antenna was 1.5 m.
Location of mobile station: Peripheric
parking place in the city of Basle.
The Butternut HF-6V comparing station was on top of a free standing 30
m high building,
and also here the resulting reports were 2 times 1 S-point better and
once
1 S-point less for the mobile station.
Overall, a nearly incredible good result.
One thing I can reveal here:
This is not a Microvert and no EH-Antenna. Here
is LINK to EH-ANTENNA
I call it a "capacitive sky
radiator".
The antenna wil be described after completion of the full test series.
State: 14th. June
2005 : 20m Tests
Since a few days I am testing on 20m.
Also in comparison QSOs wit nearby local stations.
The results look very similar to the 40m results:
On July 10 at 12.30 h QSO with EA3EHC and IK7LQH,
3 further stations were qrv in Basel.
The only station heared in Spain and southern Italy was
my mobile station ...
On July 13 at 12.30h contact with EA3EHC
in Basel HB9PP with GP (Diamond CP5), HB9TQL with Butternut HF-6V,
HB9TQN with Hustler 4-BTV GP, HB9DRJ with FD-3. There were bad conditions.
We received the following reports:
HB9PP 30
HB9TQN 41
HB9TQL 52
HB9DRJ 52
Mobilantenna 54
On July 14. I made a comparison with HB9BXS, who operated with
R7000 from Cushcraft on the roof of the building in a very good location.
I parked my car wit mobile antenna 100m distant from his house
and we had following QSOs with the following received reports:
Call HB9BXS HB9ABX
GM7ASN 03 55
LA6FX 55 57
EA1TSR unreadable 57
4Z5NB/m 33 57
RD3AW 56-7 58
Overall: very exciting results.
State: 16th. June
2005: Measuring results
Measured on the new HB9ABX antenna (20m) =
(New mobile antenna)
For
interested I was measuring today the new antenna.
The following SWR values have
been noted:
(Measured on installed antenna
on the car through 2 m coax cable)
on June 16th, 2005 with recalibrated MFJ-269.
QRG SWR
14.000 1.5
14.023 1.4
14.054 1.3
14.062 1.2
14.090 1.1
14.123 1.0
14.200 1.0
14.232 1.1
14.250 1.2
14.290 1.3
14.330 1.4
14.350 1.5
The SWR 1:2 bandwidth goes from 13.870
- 14.460
which corresponds to
590 Khz bandwidth.
The range of SWR 1.0 is adjustable in
seconds to any
frequency within the 20m band.
Now I am leaving to HAM Radio
Friedrichshafen and my next
reports will follow after the "HAM Radio".
Maybe we meet us in
Friedrichshafen ?
State: 2nd. July,
2005
Antenna comparison 2nd July 2005
Band 7 MHz , 15.00h to 15.30h MESZ
QTH: Allschwil near Basel
Test antenna: New HB9ABX antenna (1,5m radiator) on the roof of my car.
Comparison antenne: Cushcraft R7000 from HB9BXS.
Station HB9ABX: TS-50 on 12V, 100 Watt PEP
Station HB9BXS: IC-756 Pro II, 100 Watt PEP
Preparation:
First we measured the R7000 and noted,
that the resonance for 40m was
on 6.950.
We took down the antenna, shortened to top segment
until the resonance was in the center of the band with
an SWR of 1.0 .
The station was checked to verify, that 100 W output was reached.
The antenna is located on a family house at the border of the city
on a hill position with good view over the city of Basel.
With car and mobile antenna I drove some 150 m aside
to be outside of the houses, and the test could begin.
During each QSO multiple switchovers between HB9ABX and
HB9BXS in order to allow the remote station to measure
the average signal strength difference.
Remote STN rprt for HB9ABX rprt for HB9BXS QTH
GB2GDO
59
57-59
nr.
Gatwick
Airport
DL0MUE
59
58-9
Mühlberg/Elbe
Brandenburg
DC6EG
59
58
Bielefeld
PA2L
59
58
Elburg
Holland
OE5EPG/5
58
57
portable
on
the
Traun
In all QSOs multiple short switchovers between ABX and BXS
and the comment was regularly,
that ABX arrives mostly one S-point
stronger.
Then the test was terminated for this day.
State: 6th. July, 2005
6th.July 2005: Antenna test,
new HB9ABX Antenn on 40m, antenna on the ground
-------------------------------------------------------------------------------------------------------------
During all previous tests the antenna
was installed on the car with
1.5 m distance between ground and
antenna base.
Today the antenna was mounted directly
at grond level for the following test.
The SWR was also at 1.0 .
Test station: HB9ABX with TS-50,
100 W, 1.5 m long radiator.
Comparing station: HB9EBG with 100W
and dipole 2 x 20m,
with 500 Ohm feeder line and
antenna tuner between TX and feeder.
Location: Also in Basel.
Test time: 17.05 to 17.55 MESZ ,
listing the received signal reports
(= signal report at remote location).
Remote HB9ABX HB9EBG QTH
DK9KS
58
59
nr.Bonn
HB9MGY
59+20 59+20
Duggingen
DM3KXL
58
57-58
nr.Dresden
DH7GGF
57-59
57-59
Augsburg
HB9PLH
59+10
59+10
Schaffhausen
G0DML
57
QRM
unreadable
Manchester
Obtained comments:
Generally, the signal of HB9EBG
was about one S point stronger than HB9ABX,
also 3 to 6 db were given,
while during the QSB, the signal of the test station reached
the same signal strength as the comparing station.
Exception: Report from England, where
HB9ABX was hearded with S7 with QRM
while HB9EBG was not readable.
Conclusion: Direct ground mounting provides less signal strength.
State: 8th.July 2005
Antenna comparison with Microvert MV-500: 8th. July 05
-------------------------------------------------------------------------------------------------
Today I could perform a Comparison between the new
HB9ABX antenna and the
Microvert antenna on 40 m .
I was expecting long time to have this possibility,
as this antenna is mentioned many times as a very good
short antenna.
But, there is not "the Microvert", as there exist a wide
variation of different versions, described by the inventor,
DL7PE.
At HB9MGY I found two variants for 40 m, the ordinary
slim version, and the improved version with the round plate
above the coil, called model MV-500 or Station antenna.
The coil is wound in a special manner for low capacity.
We used the improved MV-500 for our test.
Location: Duggingen, 12 Km south of Basel.
Time: 10.00 to 10.25 MESZ
Test station:
HB9ABX with TS-50, 100 W
Comparing station: HB9MGY with 100 W
The MV was located on the free terrace on the side
of the house, on a 1.5 m high support
and I parked my car abt. 20 m next to the house,
somewhat lower.
The location is to be
considered as bad location for HF,
as Duggingen is down in a narrow valley.
We had contact with HB9ATX/EA3, located near
Palamos near to the coast in Spain.
We received the following reports:
HB9ABX = S4 to S5 with 100 percent readability.
HB9MGY = S1 to S2, signal was heared, but unable to understand.
The
signal
from
HB9MGY
increased
by
one
S-point
after
he
switched
to
the
longwire
antenna.
Other stations listening in Basel noted a big difference between the
two stations.
Report from HB9BPP:
HB9ABX = S9+5 dB
HB9MGY = S6 with Microvert
HB9MGY = S7 with longwire
Further tests will follow.
State: 12th.
July 2005
Today
a Test was performed on 20 m as comparison with
the
Cushcraft R7000 from HB9BXS.
Test station: HB9ABX, 100 W,
1.3 m long antenna on the car.
Comparing station: HB9BXS, 100
W, R7000 on top of the roof.
Distance between test and comparing
station abt. 150 m.
Time: 16.05 to 1745 h MESZ,
14260 - 14290 KHz
Reports received from remote stations:
Remote
HB9ABX HB9BXS QTH
SM5HDJ
58
57
nr.Stockholm
G3GYE
55
54 Landsend
IS0HQJ 54
54
Sardinien
(Insel)
2E1GOS
59+20
59
George
UK
G0LHH
55
55
Birmingham
G6ZBV/m
57
57
nr.Birmingham
M3JUQ
57
56-7
N-London
G0GNE
57
56
Guildford
9A2KL/YU
59
58-9
nr.Belgrad
G8GIY
59
57
Mutlock
F/PA1EW
58-9
58-9
SuedFrankreich
4L4MM
57
57
?
Georgien
During all QSOs several short
changeovers between
ABX and BXS and requesting the
remote station to measure
the signal difference, averaged in the QSB.
Hereby the difference was
mostly 1/2 to 1 S point, in some
cases 2 S points stronger for HB9ABX. In no case the signal
of HB9ABX was weaker.
Is the new antenna a wonder ?
>>>>> Look here.
State: 13th. July
2005
Antenna comparison Microvert 40 m
extended
--------------------------------------------------------------
On July 8th only a single QSO could be performed, comparing the
Microvert
antenna. Therefore an extended comparison was planned for today.
The improved Microvert MV-500 was installed in a free test field close
to the new HB9ABX antenna, mounted on the car. Both antennas have the
same length and are installed at the same hight connected to the same
transceiver via a Coax Switch.
Both antennas indicated SWR 1.0 on the crossneedle instrument.
The test began at 12.20 MESZ and terminated at 14.45 MESZ, after
completeing 14 comparisons contacts
.
The results showed a clear picture, which indicated that the new HB9ABX
antenna received in most contacts 1 to 2 S points more (= 6 to 12 dB).
In the receive mode of the signals the same difference was noted.
The comment was generally: With HB9ABX antenna also in QRM good
readable, while with the MV nearly unreadable.
Here follows the received signal reports in S points:
Ant1 = HB9ABX Ant, Ant2 = Microvert, Modell MV-500 (DL7PE)
Remote Ant1 Ant2
QTH
DF6OE 7
5 nr.Ingoldstadt
F5FCH 8
6 Blois
DC6NY 9
9 nr.Nürnberg
DJ4WJ
5
3-4
Neumark
DL5KUA/p 9+5dB 8
Stabehoch nr.Burg
I3/I6KYL
9
8 Bellano
DG4BZ
9
7 nr.Osnabrück
DK9HJ
5
3 North sea, coast
HB9DQH 7-9
5-7 Chur
HB9N
7
5 Thun
SN4NMU
8
7 Glogo (Poland)
F5LMH
8
7 Lyon
OE50GMQ
5
2 Spittal/Drau
HB9JB
8
7 Uhwiesen
Here you see the installation of this test close to Basel:
In the foreground
the MV-500 and on the car the RoomCap antenna.
State: 15th. July
2005
Antenna report 15th. July.05
--------------------------------------
Today I performed the first
successful test on 20 m with the new antenna
on the roof of a house,
on
14.317
MHz
from
12.15
to
12.45
MESZ.
Antenna: 1.3m long radiator
Transmitter: TS-50, 100W
The location was on a flat
roof in Allschwil (Basel), 11 m above ground
on top of an industrial building.
The antenna was adjusted on
20m, as well as on 40m to a SWR
of 1.0 at 50 Ohms.
20 m Tests:
The following stations from Basel and
vicinity were qrv:
HB9PP with GP: CP5 Diamond
with 100 W
HB9BPP with Beam 5el DJ2UT
with 100 W
HB9EAX with GP: R5 Cushcraft
with 100 W (17km distant)
Remote stations:
SM4/HB9ZA nr.Lulea (Sweden):
receeived HB9ABX as strongest signal
Comment: HB9ABX
1.5 S points stonger than HB9PP
IK7LQH Appulien: Strongest
signal: HB9ABX, HB9PP not readable
EA6/HB9DNY (Mallorca):
Strongest signal: HB9ABX
Comment: HB9ABX 1
S point stronger than HB9EAX
For next week a longer test is planned
at the same location
on 40 m.
Probably next Tuesday
afternoon.
Until then ...
State: 19th. July
2005
Antenna test 19th. July 2005 on 40 m.
Band = 7 MHz, flat roof , industrial building, 11 m above ground.
Both stations with 100 Watt.
A longer comparison test on 7 MHz took
place between:
GP: Cushcraft R7000 on the roof of a family house of HB9BXS
and the 40 m HB9ABX antenna (1.5 m long) on the flat roof.
The test began at 1715h MESZ und finished at 1930h MESZ.
Unfortunately the band was nearly dead and only very few stations
could be heared with weak signals. One had to search long to find
a station. This one was called and the comparison test performed.
The result was, that in most contacts, both stations arrived with
nearly the same signal strengths, the differences were small.
The test indicated, that in a roof installation the small antenna
equals the performance "of the bigger brothers".
Here follows the worked stations and the
received reports in S points.
Remote STN HB9ABX HB9BXS QTH
DL7WA
8
8
Hof/Bayern
DJ4PZ
8
8
Willhelmshafen
HA/DK7ZU
8-9
8-9
Malaton,
Hungary
DC3TS/p
9
9
Waren,
North
Germany
PE0PSL
8
6
Arnheim, Holland
SO3AD
9
7
West-Poland
G0ECX
9
8
Weymouth UK
G3MCA
9
8
Kent UK
G3FGH/m
8-9
8-9
Grimsby UK
DB2LTU
7 (9)
8 (9)
Heiligenhafen, East sea
M0BBZ
9
8
UK
EA2ID
9+5
9+5
Zaragossa, Spain
EA3BGQ
9
9+10
Tarragona, Katalonia
State: 22th. July
2005
Here I
refer to the test performed on the 13th of July
(extended Microvert comparison).
I received several mails on this subject und would like to
explain why and how the result could be obtained:
Read here: MV-losses
State:
26th.
July
2005
DX
result of test on 20 m
from 26th. July, 2005, 20.45 to 22.00 UTC
-------------------------------------------------------------------------------------------
This is the first time that an antenna comparison of the HB9ABX antenna
was performed in DX contacts. (DX = large distance, overseas).
HB9ABX = 1.3 m long antenna, 100 w PEP, 150 m distant from HB9BXS
HB9BXS = R7000 on the roof of his house, 100 W PEP
Long QSOs with DX stations on 20m gave the following results:
Reports shown are received reports in S points (averaged in QSB)
Call
HB9ABX
HB9BXS
QTH
K1EKF
3
1
Evans,
Georgia,
USA
HB9DTF/mm
3
0-1
Coast
of
French
Guayana,
South
America
W1LC
4
2
Spencer,
Massachusetts
USA
W1ZY
5
2-3
Brooklyn,
NY
USA
2E1MJH
5
2
Clare,
UK,
not
DX
State:
13th.
August
2005
Results of 9th. and 12th.August
On August 9th. I made a Comparison test with a 5-Ele Beam
from HB9BPP. On top of the 7 floors
building at the altitude
of 27 m is the DJ2UT-Beam Model 5c
installed.
The beam was directed towards the
remote stations.
We performed the tests while I was
located at a parking place with my
test antenna of 1.3 m length.
Both stationen with 100 W PEP.
The following QSOs were made
between 20.20 - 20.35h
MESZ:
Remote Stn. HB9ABX
HB9BPP
------------------
------------ ------------
OH5ZZ
59+10
59+20
SM2YZZ
59+10 59+10
LA6TOA
58
58
Surely interesting, isn't it ?
---------------------------------------------------------------------------------------------
Clay tile roof Test
On August 12th. August we made the
first antenna test on
a building with clay tile roofing and wooden understructure.
The test antenna was mounted
vertically in the center of one side
of the roof, the base of the antenna 20 cm above the roofs.
The R7000 was monted on a mast on top
of the roof,
abt. 2 m distant from the end of the house.
The test was conduted on 40 m
band.
Comparing antenna: R7000 (Cushcraft)
with its own radials and
Test Antenna: HB9ABX (1.5 m long).
Both antennas decoupled from each
other and connected to the
same transceiver via a coax switch.
Here follows the QSOs with the
received reports:
Remote stn.
Testantenna
R7000
QTH
Remark
------------------
----------------- --------
------
-----------------
DL1AVP/p
57
57
Isle Rügen R7000 1 db stronger
DL5DIL
57
57
1/2
Dresden
R7000
1/2
S
point
stronger
PA/DJ5KP
57
57
1/2
Ost-Kapelle
both
equal,
sometimes
R7000
somewhat
stronger
OZ/DK3HG
57-59
57-59
Bornholm
both
equal,
no
difference
DJ4HG
59-59+
58
Rott/Eifel
Testantenna
well
1
to
1.5
S
points
stronger
Then came the unexpected end: The
neighbour returned from vacation and was disturbed
by the antennas. To keep freedom, we dismounted all from the roof.
We intended to conduct at least 10 contacts on 40 m and afterwards to
perform a test
on 20 m during one hour ...
Interesting
note during test on the clay tile roof:
----------------------------------------------------------------
During receiption, the test antenna
delivered a clear signal from all stations, while
listening with the R7000 all stations disappeared in the noise, except
DJ4HG, who
was the strongest station. The
noise was man made noise, as caused by TVs,
computers, and monitors.
The signal/noise relation was between 10 to 18 dB better, using the
test antenna.
This shows, that the antenna operates
upwards and suppresses well downwards.
State:
30th. August 2005 DX DX DX
DX DX DX DX DX DX DX DX DX
DX-Test on 20 m: To Trinidad (close to
Venezuela), South America.
On August 29th we made an extensive DX test on 20 m.
The duration of the test was over one hour, and beside my test station
further
two local stations and one distant station participated as comparing
stations.
Test station: Felix
HB9ABX, 1.3 m long ABX radiator installed on car with 100 W PEP.
Test site 1 = Parking place "Bachgraben"
(Basel-Allschwil)
Test site 2 = Small hill in Allschwil,
street to Neuwiller
Remote station: Beat, HB9DTF/mm in Trinidad, Port-of-Spain, inv.V with
100 W PEP
Comparing station 1 = Sämi,
HB9BPP,
5
Ele
Beam
(DJ5UT)
27m
high,
100
W
in
Allschwil
Comparing station 2 = Ueli,
HB9EAX,
Cushcraft
R5
mit
100
W
PEP
18
km
distant
Comparing station 3 = Sigi,
OE6KNG,
3
Ele
Yagi,
15m
high,
100
W
in
Graz,
from
22.35h
on
Start of test: 22.00h MESZ on 14.318 Mhz from test site 1.
General remark: The signal from Beat was received by all participants
with very large
signal strength variations, rapid QSB in the order of 3 S points,
whereby the average
signal strength varied slowly between S3 and S6.
22.00 Start of test: Beat received Felix with R5, Sämi with
R5, and Ueli
was heared with R1 (not readable, just detectable),
Sämi arrived a little stronger than Felix, but
could not be measured in S points
due to rapid QSB.
22.10: Felix is driving to test site number 2 (duration 8 Min).
22:20h-22.30h Felix noticed a slight signal improvement of Beat
signals. Difference minimal.
Then we performed a number of short changeovers between
Sämi and Felix to permit
Beat to perform a signal comparison:
Comment from Beat: Sämi and Felix appear to have the
same strength, both are readable
with R5. Difference below 1 S point advantage to Sämi.
Ueli
now
with
R2
(barely
readable).
22:35h : Sigi appears and receives from Beat about 1 S point better
report than Sämi.
Now Ueli can be received with R3 (weak readable), later
back to R2 from Beat.
Felix and Sämi with R5.
22:45 bis 23:00: Several short changeovers between Sigi, Sämi and
Felix:
Comment from Beat: Now all 3 stations arriving with the
same signal strength
in Trinidad. Exact S points cannot be given due to rapid
QSB.
Additional info: Between Graz (Austria) and Basel were short skip
conditions.
Sigi's signal reached S9+ at some times in Allschwil.
Conclusion: The ABX radiator demonstrated a very good
performance in DX communication
for both test sites, in parking place as well as on a slight hill.
There was a difference
noticable between test site 1 and test site 2. Signal from test site 1
arrived slightly lower
than Sämi. On test site 2 there was practically no difference
between Sämi (5 Ele
Beam 27 m above ground) and Felix!
- Here follows the email, I
received from Trinidad after the QSO:
I nearly can't beleave it, that your antenna is only 1.3 m long,
and at my next Cybercafe
visit I will have a look to your homepage.
The strength of your signal was slightly weaker than HB9BPP while at
the parking place
in the city, and on your drive.
When arrived in Allschwil on the small hill, there was no difference to
detect between
your two signals ...
State 16th. September 2005: Last
2 weeks.
What happend in
the last two weeks? Read here
For
antenna
unbeleavers:
(22th.
Sept.
2005)
Michael, DF8WI, visited me and wrote this mail:
Hello, all interested in antennas
<<< (Click to read)
State 6th. October 2005: 80 m
The
new 80 m construction is finished, here follows the information:
New 80 m HB9ABX antenna
<<< (Click to read)
State 14th. October 2005:
Several improvements
could be obtained in the last few days:
20 m and 40 m improvements
<<<
(Click
to
read)
State
1st.
November
2005:
Power testing of the antenna with high power:
Test report 1 KW on 20 m and
40 m <<< (Click to read)
State 9th.
November 2005:
Now I was
able to build a 3 band version, which I was
testing and measuring today:
3 Band Version
<<<
(Click
to
read)
State 26th. November 2005:
Good question about the
construcion guide of the new antenna:
Here the answer
<<< (Click to read)
State
14th.
December
2005:
Why a NEW HF ANTENNA ?
Here the answer
<<< (Click to read VARYLINK etc.)
State 31th. December 2005:
Technical functions of the
VARYLINK
Varylink
<<< (Click to read)
State 6th. Janaury 2006:
3 Band Antenna: Measuered
values and picture
20-17-15m antenna
<<<
(Click
to
read)
State 16th. Febr.
2006:
During January/February tests were performed
in Chile on 20m and 40m
Chile Tests
<<<
(Click
to
read)
State 1st May 2006:
A new antenna version: 2 band RoomCap for 20m and 30m
20-30m antenna
<<< (Click to read)
State
28th
May
2006:
Experience on 80m (mobile installation)
Report 80m
<<< (Click to read)
State
1st
June
2006:
New antenna version for 10/11/12 m
10m RoomCap
<<< (Click to read)
Explanation 29th June 2006:
Why is the small RoomCap so efficient ?
Efficiency of the
RoomCap Antenna <<< (Click to read)
State 15th July 2006:
Field strength
measurements RoomCap
Measuring
results 20m <<< (Click to read)
State 4th August 2006
New version: 160 m RoomCap (power capability 1 KW SSB)
160 m test reports
<<< (Click to read)
State 6th September 2006
160 m antenna at 2% and 1.25% of
wavelength
160 m antenna shorter and
shorter <<< (Click to read)
State
24th October 2006 / UPDATE 28th
Oct 2006
Evaluation of the antenna
by antenna builders: VE3UNF +
ON6EJ
Here
are the reports <<<
(Click
to
read)
State 29th October 2006 / UPDATE 12th Nov 2006
Life demonstrations of the RoomCap
antenna
Dates and reports
<<<
(Click
to
read)
State 7th November 2006 / UPDATE 14.April 2007
80m
SWR bandwidth as Excel sheet + picture
of
anteanna
Here is the bandwidth
data <<< (Click to read)
State 30th November 2006
Comparison
with
Magnetic
Loop
antenna
Here is this
report <<< (Click to read)
State
1st
December
2006
Comparison with EH antenna
Here is this
report <<< (Click to read)
State 19th March 2007
RoomCap
antenna
simulation
with
NEC
Read report here
<<< (Click to read)
State 14th May 2007
Comparison
with
Titanex
GP
40-10
Here is this
report <<< (Click to read)
State 22nd May 2007
Builder
report
from
Germany,
DL5GBP,
40m
band
Here is this
report <<< (Click to read)
State 9th June 2007
Report
of
antenna
measuring
with
MiniVNA
antenna
analyzer
Here is this
report <<< (Click to read)
State 15th July 2007
Reply
to
critics
of
RoomCap
antenna
Here is this
report <<< (Click to read)
State 17th September 2007
Comparison with horizontal loop
antenna
Here is this
report <<< (Click to read)
State 16th. February 2008
On 40m : DX experience
Here is this
report <<< (Click to read)
State 11th April
2008
Antennas and
Physics, technical article
Here is this
report <<< (Click to read)
State 18th May
2008
RF/DC
separator eliminates control line
Here is this
report <<< (Click to read)
State 1st June
2008
BIG SUCCESS: Antenna test
by Military
Here is this
report <<< (Click to read)
State
4th
December
2008
(update Dec 15, 2008)
Super DX
results on 80m
Here is this
report <<< (Click to read)
State
4th January
2009 (update Jan 13, with 80m
result)
Results from
Puerto Rico: Comparison with fullsize Vertical on 30/40m
Here is this
report <<< (Click to read)
State 11th February
2009
160m DX
Antenna in
Puerto Rico
Here is this
report <<< (Click to read)
State 14th June
2009
User comment
about the 160m Antenna
Here is this
report <<< (Click to read)
State 10th April
2010
80m Antenna at
DL2SBF (very, very satisfied)
Here is this
report <<< (Click to read)
State 14th April
2010
80m-DXCC with
Roomcap (JA8CNF)
Here is this
report <<< (Click to read)
State 3rd July
2010
Roomcap user
comment (EA8AYT)
Here is this
report <<< (Click to read)
State 27nd November 2010
Roomcap in the
Internet
Here is this
report <<< (Click to read)
State
5th
January
2011
Presentation
of VARYLINK and RFA
Here is this
report <<< (Click to read)
State 29th January
2011 / 30.3.2011
Frustration
and Success from DL9PB
Here is this
report <<< (Click to read)
State
7th
April
2011
RoomCap rocks!
(AC8CE)
Here is this
report <<< (Click to read)
State
10th
November
2011
Antenna -
analysed
Here is this
report <<< (Click to read)
State
22nd
November
2011 / Upd 20th Dec 11
RoomCap as
super CB antenna (11m)
Here is this
report <<< (Click to read)
The Tests are going on. Will keep you informed here. Please check in frequently to see ...
Felix Meyer HB9ABX
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