[TowerTalk] Re:Tuning Yagi's w/ non-insulated elements ?

[Jan.E.Holm@telia.se]

Hard to tune antennas in real life if you don´t own an
antenna test range. The only thing you tune or rather
you match your feedpoint to your feeder.
Instead, run the design in a computer and use a 
program you trust. Or let someone you have confidence
in do it for you.

73, Jim SM2EKM
--------------------------------

-----Ursprungligt meddelande-----
Från:	z.pitman@libertel.nl [SMTP:z.pitman@libertel.nl]
Skickat:	 den 15 mars 2000 10:14
Till:	towertalk@contesting.com
Ämne:	VB: [TowerTalk] Tuning Yagi's w/ non-insulated elements ?


Hi,

Let me ask for your collective wisdom about this... 

At the local club we are doing some major refurbishment on the 20m 
Yagi's.
These Yagi's were built some 15 years ago using the dimensions given in 
the
W2PV book (6 el Long John design). Due to the local circumstances all
elements had to be grounded to the boom. Gamma matches were applied. The
only tuning those antennas had to undergo was a minor adjustment of the
driven element length through the gamma match. Despite of the complete 
lack
of serious measurement equipment we were confident about it's 
performance:
the SWR curve and bandwidth was OK, and the antenna earned several CQ 
and
ARRL plaques. 

Now these Yagi's are laying on the ground waiting for new rivets and new
bearings. 

My question is: How could/should I fine-tune yagis with non-insulated
elements once it's put back where it belongs ? I'd like to measure the 
sole
antenna only without any matching but have no idea what is the best way 
to
do it. This monster is too heavy to be handled manually and the
cherry-picker costs a fortune every hour..

Your input would be gratefully appreciated. 

73 de Zoli HA1AG


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