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Friday, February 23, 2018

Satellite Yagi crossed 2m, 70cm

Just for fun. Construction of an antenna for experimental satellite communication, 8el. (435 Mhz) x 4el. (145 Mhz) Satellite Yagi crossed.
No difficulty to built this antenna. Except the gamma match that requires a little more attention, but with the informations provided by Alex, XE1MEX, and Rob VK2GOM  (link below) it works very well. Adjustments are easy to adjust.
The bandwidth is very wide on both QRG's.
Without waiting .. Hi, 1st test after adjustments, heard S0-50  59, but duplexer must be checked..(easy to do it).

Almost ready.. ! Not very beautiful, need some improvements for the aesthetic, but the measurements are excellent, So now ... waiting for ISS or a satellites pass above..
I recommend this construction 73 ZS1II

*** 25 Feb 2018 ***Duplexer repaired. The antenna works wonderfully with the Alinco DJ500.  First contact from St Helena Bay locator JF87XF on AO-91 satellite with Tom, ZS1TA and heard many other ZS stations.
Must do fast, pass duration only 11mn...
 
Dipoles are alu pipe dia. 12mm, élements rod alu. dia 6mm, Boom square 20mm

Coax is 10DFB, perfect match in the alu pipe.
Inspired by:
and 
 VK2GOM  Rob – international HAM magazine HAM-MAG April 2010  No 15
A 70cm/2m crossed satellite antenna

04 March 2018 -Simple portable Setup and homemade antenna work fine.
I prefer to use the tripod. It will also be necessary to connect a MP3 recorder because is it not practical to note the call signs, the QSO's, and to hold the antenna to track the Sat's.