|Subject:||[TowerTalk] How to best determine the need for a balun|
|Date:||Fri, 15 Oct 2004 23:50:14 -0700|
Here's the lash-up: a mostly vertical 1/4 wave vertical up through a fir
tree over 27 radials that has best SWR (1.0 : 1) at 1828 when measured
at the feed point. After running roughly 350' of RG8 equivalent to the
feed the best SWR (again 1.0 : 1) is now at 1858 when measured at the
operating position. There is no matching system employed.|
Does this mean:
a) I need a 1:1 balun as the feedline is part of the radiator? (Doesn't make sense as the sweet spot should've gone down toward 1800 as the radiator is lengthened?)
b) I've created a wiry outside dummy load? (the few tests done comparing a 1/4 sloper and a dipole at 70' with the 27 radial beauty with stations on the right coast indicate anywhere from a 6 to 18 dB improvement over the dipole and sloper so maybe it's just slightly less of a dummy load than the other two?) I do realize that such tests are frivolous and mean about as much as some presidential polls given all the variables, but gives me a reason to bust in on scintillating discussions regarding bodily functions and favorite now dead transmitters and new antennea, etc. etc.
c) I should just shut up and try the thing out and first time I can't work a particular station, blame it on the lack of a balun and then install one?
Tnx for any insight from the learned or even the opinionated among us.
73 and I remain,
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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