[TowerTalk] 9913 in rotating app

[K7LXC@aol.com]

In a message dated 98-07-20 11:17:55 EDT, amaertz@oppd.com writes:

<< Is there a recommended (i.e., possible) method for using 9913 (non-flex)
 coax in a rotating antenna application? I have a set of m^2
 uhf/vhf yagis mounted on one boom with feedpoint near the ends (both
 yagis have 10 foot booms).  The cross boom to which the pair is mounted
 is 7 feet long.  Given that I need 360 degrees az and 90 degrees el, can
 9913 be used without breaking?  If so, what would be the recommended
 method for connecting the coax?

       No, solid inner conductor will crack and break over time due to the
movement. It'll work for awhile and then trouble.

     The recommended method is to use a jumper of stranded inner conductor
from the antenna to the tower. 

>> I am considering using sections of 9913 flex from the ground point at
 the top of the roof mount tower to the yagis, but would prefer using the
 9913  non-flex all the way since I have a fair quantity of it.  >>

       Use the 9913-F as the jumper. Additional connector insertion loss is
insignificant. As long as everything is weatherproofed, it'll work reliably
for years. Check out Champion Radio Products for professional wxproofing
products.

Cheers,  Steve   K7LXC

http://www.championradio.com

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