[Moon-net] 8N1EME

[Rastislav Galuscak]

Hello Mike,


   congratulation to the excellent project and performance of your 8N1EME station to you and to all of your participants. Here, in Czech and Slovak republic your station has attracted a lot of attention among VHF and UHF ham-radio community.  It was a challenge for us to work on such splendid project. We are also very glad, that our designed feed and loops have worked as predicted. We think, that your "marketing" (publicity, education etc.) was also excellent. Your web-site is very nice. We guess, that your transmition from KDDI has been not only ham radio event but also function.
   Mike, as we have already informed you, we would like to write some article about design of used feed systems and their construction.  We think, that using a dish antenna as prime feed for Cassegrain system is unique solution worth to describe in an article for European Conference on Antennas and Propagation  in Scotland or for DUBUS magazine. Also, we appreciate any measured datas of KDDI system applied for ham radio bands, if you have any to share with us.
   
   Sincerely,
                     Rasto, OM6AA  behalf of Mr. Hazdra- CTU & Milan, OM1ATT
   

jh1krc at syd.odn.ne.jp wrote: Dear Rasto,

I would like to report you with great pleasure that the performance of IBA-4 EME antenna was surperb.  

As we expected with the simulation, the SWR and beam pattern on each band are satisfactory. 

The idea to use loop feed for low bands using the subreflector as a ground plane seems to be the best and ideal, and contributed a lot for multi-band operation of this big dish.   Marionette sytem also contributed for the best performance to maintain the best position of the feed and the impedance matching during the experiment. 

Small dish feed to illuminate the subreflector worked satisfactory. I wonder if someone can expect the better performance with some other methods.  

We worked about 200 QSOs on 144, 432, and 1296 MHz. 

Unfortunately the restriction on the dish operation maintained by the KDDI staffs limited the data collecting.  We only measured the Sun noise, twice on each band. once by tracking the Moon and another by watching the Moon with fixed antenna position. 
The data will be reported later. 

We are very pleased to see the cover page of the recent DUBUS.  
Most of the cover boys are involved in the BIG-DISH operation.  

By now all of the antenna feeds are removed for the next experiment on 5760 MHz on March 24.   Already we heard our own echo on this band, not strong but very clear.  I think we need more receiver gain, or adjust the antenna position more exact.  

We performed slide lectures and open house experiment on March 03, with some 100 attendants.  Several school boys and a girl came to the IBA-4 EME class on 1296 MHZ, to listen to the echo of the anouncement of their names by USA EMEers. 

A eleven-year boy with the first class amateur license (!) joined us to contact with K5JL on 1296 SSB.  Perhapse this is the world record of the EME operation by the youngest amateur.  

We would kindly offer you the most heartful thanks to you and your engineering staffs of Czech Technical University.  
The round septum feed of 1296 MHz, made by OM1ATT, showed the best performance for our BIG-DISH system.  

Our activities are reported on occasion at:
http://8n1eme.jp

Pelase listen to the booming echoes with 32-m cassegrain at KDDI Ibaraki Sattelite Communication Center.


73es,  

Mike Watanabe, JH1KRC
8N1EME/Project BIG-DISH 2007





 
---------------------------------
No need to miss a message. Get email on-the-go 
with Yahoo! Mail for Mobile. Get started.