Posted by
Don Wilhelm-3 on
Oct 12, 2006; 2:56am
URL: http://elecraft.85.s1.nabble.com/inverted-vertical-tp394470p394472.html
RC,
I would think it may work for you that way, but I would be skeptical about
the counterpoise effectiveness on bands other than 20 meters. I would
suggest a quarterwave counterpoise for each band that you plan to operate to
keep the RF at the K1 location to a minimum - even if it cannot run
straight. Remember that the the open end of the counterpoise will have a
high RF voltage (yes, even at the K1's QRP power), so keep the far end
isolated and insulated.
The other way to handle the counterpoise on several bands is to tune it with
lumped inductance (or capacitance) so it is an electrical quarterwave on the
band you are operating. There is commercial gear that does just that, the
MFJ Artificial Ground is one example, but you could easily homebrew an
equivalent, usually a series tuned circuit is all that is needed along with
some indication that the electrical quarterwave tuning has been achieved (an
RF current meter in the counterpoise wire will do - tune for max current).
73,
Don W3FPR
> -----Original Message-----
>
> Hi All
> In preparation to moving into a 3rd floor Seniors apartment. I wonder
> how well a 51' end fed wire suspended [via a fly rod reel so that it may
> be retracted and stored when not in use] from the window with a 16'
> counterpoise on the apartment floor against the wall. Using my K1-4 with
> a KAT1. About two feet of wire to the Banana Plug adapter can be used or
> would coax fed be better [center conductor to the End Fed Wire with
> shield to the counterpoise] on the K1 to keep RF at a minimum in the
> apartment.
> 72 RC kc5wa
>
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