Tom - You should use a 1:1 balun to feed the balanced line with the K2
tuner. You can easily make one by wrapping a dozen or so turns of RG-58
through a type 43 or 61 core FT140 or larger. Diz, at
<
http://partsandkits.com/index.asp>
is a good source of these toroids.
Alternately, you can slip a half dozen type 73 ferrite beads over RG-58. The
beads are available from Mouser as part number 2643540002. COvering hte
whole assembly wiht heatchrink tubing keeps things from moving around.
I would avoid using a 4:1 balun. On those bands where the antenna impedance
is low the balun will make it lower and harder to match and will result in
more loss in the tuner.
If you have trouble tuning the antenna, you can add an additional section of
feeder to help the match. Others have popinted this out sa well.
If you feed the antenna with balanced feeder you don't need to make the
dipole resonant, yoiu can make it any convenient length. Some lengths have
advantages over than others, but if you make it shorter than about 0.4
wavelengths, SWR on even a balanced feeder will be high and losses will be
large for long runs. - Dr. Megacycle KK6MC/5
_______________________________________________
Elecraft mailing list
Post to:
[hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help:
http://mailman.qth.net/subscribers.htmElecraft web page:
http://www.elecraft.com
Locked
