TIKALUNA GLENBURN, VICTORIA, AUSTRALIA

MOON BOUNCE COMMUNICATIONS and RADIO ASTRONOMY

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Doug McArthur

This article appeared first in DUBUS 2/2006 and provides full   constructional detail including photos of the dual feed system. For   many years the interaction and feed methods to illuminate dishes   has always been a matter of conjecture. The 70 cm feed (dual   polarity switching) is revisited in this article and provides the   lowest practical loss system of this type. Tips and construction   methods as well as set up procedures are covered in the paper.




 Down load … VK3UMweb.pdf (2670kb) This includes black and white photos .


 Separate higher resolution colour photos as per article numbering  Photo 1.jpg  to  Photo 9.jpg  are available for down load. [refer link below]


 As mentioned in the article a RF Bridge was constructed and used in the alignment  of the 70 cm feed system. The circuit and description is provided in  RFBridgeSchematic.jpg  with additional constructional photos of the unit  RFBridge1.jpg and RFBridge2.jpg.  


All of the above photos are available for down load as a zip file here

              VK3UM Dual Feed.zip (2,544 kb)


Discussion & findings K5GW and VK3UM re feed phase component. G3LTF paper on a Modified Dual Dipole Dish feed.