There was no noticable shift. I guess that is the case on HF.
73
tonno
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Hans
Hammarquist
Sent: Wednesday, February 06, 2013 5:51 AM
To: towertalk@contesting.com
Subject: [TowerTalk] Fwd: 15m monster finally up - EME and Video
How much was the frequency shift due to the moon's movement?
Hans - N2JFS
-----Original Message-----
From: Tõnno Vähk <tonno.vahk@gmail.com>
To: towertalk <towertalk@contesting.com>
Sent: Tue, Feb 5, 2013 8:49 am
Subject: Re: [TowerTalk] 15m monster finally up - EME and Video
Hi,
After two fruitless attempts at moonrise I got EME QSO with myself done during
moonset.
Here is the video of the best minute out of ca 10 minute period the signals
were audible with strong QSB on January 13th, from 1615 to 1625z ca 2 hours
after sunset:
<http://youtu.be/QCP0kisTbME> http://youtu.be/QCP0kisTbME
Moon was setting at ca 243 degrees azimuth and the signals were audible while
the moon was from 3.3 to 2.2 degrees of elevation peaking at 2.6 degrees.
Antenna was pointing within 3 degrees of the correct direction.
Radio: FTDX5000 + ACOM2000A.
It is noteworhty that the band was not 100% closed as even some SA signals were
heard. Also the amazing strength of the signals at expecially the 3rd time the
signals come back is probably also attributable to some ground gain at this
elevation.
I wish I had also tried SSB and maybe the 4 high tribander stack for comparison
but was too excited to remember. Should also try if changing the radiation
angle to say even 30 degrees would allow hearing moonbounce from that
elevation. Next timeJ
Now all I have to do is to find someone interested in attempting real 15m EME
QSO (anyone done that before?) who would have coinciding sunset/sunrise and
high gain antenna on 15m.
Can anyone recommend a good program that would picture moon grayline (like DX
Atlas for sun) that would enable to easily identify possible paths for EME at
any given time/day?
Here is also the high resolution video of the tower erection put together by
ES5PC. It also includes the very first QSO with the new stack with Paul,
K8PO:
http://youtu.be/Z9fDlbIFhMs
I have also made tests regarding the use of different elevation angles (by
shifting the antenna pairs 180 degrees out of phase) and the first results are
very interesting. Proving that for DX normally the lowest 4 degrees is best but
even for DX sometimes 7 or 10 degrees is noticably better bringing an otherwise
not audible signal out from the noise. The same is true about some EU signals
that peaked at 15 degrees while almost not being audible on low angles. So I
will do more testing but I am more convinced now that even in contest the
switching of angles might be useful trying to get a weak signal out from the
noise and high angles are sometimes very necessary.
73
Tonno
ES5TV
From: Tõnno Vähk [mailto:tonno.vahk@gafm.ee]
Sent: Tuesday, September 25, 2012 9:48 PM
To: towertalk@contesting.com; cq-contest@contesting.com
Cc: es5tv@erau.ee
Subject: 15m monster finally up
I am happy to inform all friends that a project of last 4-5 years was completed
during the last weekend at ES5TV KO38CS central ES QTH and a double H frame on
15m was finally erected what is probably one of the biggest 15m setups in the
world today.
See the full 2-day gallery at:
http://pontu.eenet.ee/es5tv/
Go to the last 16th page if you wish to see the final product right awayJ
70 meters high tower carries 8 5-element 15m yagis as pairs separated
horizontally by 12 meter distance and vertical stacking is 14 meters. The
heights of the antenna pairs are 64, 50, 36 and 22 meters.
Antennas are Optibeam OB5-15:
http://www.optibeam.info/index.php?article_id=76
<http://www.optibeam.info/index.php?article_id=76&clang=1> &clang=1
Tower is produced by 4O3A/YT3M:
http://www.4o3a.com/index.php?option=com_content
<http://www.4o3a.com/index.php?option=com_content&view=category&layout=blog&;
id=99&Itemid=499> &view=category&layout=blog&id=99&Itemid=499
Model shows ca 16 dbd free space gain and almost 24 dbi gain at 4 degrees over
real ground. Beamwidth is less than 30 degrees. Testing has been so far limited
but the results confirm exactly the modelling results. Pattern measured with
signal generator and SDR was almost identical to what the computer suggests and
signal levels drop ca 12 db when antenna is 20 degrees off and already 20 db
when 25 degrees off the correct direction. There is huge -50db+ null at 90
degrees confirmed with real measurements (!) and ca
-20-30 db signal drop on the other directions.
First comparisons with my best antenna so far (4 high tribander stack) show ca
10 db advantage to US when pointed right. That is huge of course. At the same
time east coast and west coast can’t be covered with one directionJ
The stack will have phase switching capability which allows any pair of the
4 to be switched out of phase to change the radiation angle. Pre-configured
steps are 4, 7, 10, 15, 30 degrees while maintaining most of the gain as all
antennas are always connected. The phase switching is not yet connected but
will be very interesting to see the results and to get some real insights into
how the different angles play.
We briefly tried to hear the moonbounce when the moon was on horizon but did
not succeed yet. But 15m was wide open and signals probably did not penetrate
the ionosphere. I still hope to be able to complete some EME QSOs with the
stackJ
CQWW RTTY on the coming weekend will be the first contest for the monster.
Let me know how ES9C will sound on 15 meters. As the rotating is still manual
will keep it either to US or JA.
73
Tonno
ES5TV
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