Brad: Regarding my remarks about an end fed wire, make it an odd 1/4 wl.
for the band of operation. In fact, a few degrees longer will bring you
up to the 50 ohm feed point with some inductive reactance which you could
tune out with a small air variable condenser of about 250 mmfd. If you
can live with the vswr, forget the condenser.
Bill W7KXB
Mesa, Az.
On Fri, 14 Mar 1997 22:26:12 -0500 (EST) Joe Everhart <n2cx@voicenet.com>
writes:
>Brad,
>
>You queried about ideas for backpacking antennas. I am, of
>course rather partial to lightweight dipoles fed with small
>coax (like the PVC Gusher-II), but lately I've been focussing
>on another option.
>
>An end-fed half-wave antenna is even lighter than the dipole
>becasue it has no long coax feedline. You do need a tuner and
>a counterpoise, though they can be simple. The tuner can be a
>vary simple one like the Rainbow. and the counterpoise can be
>a very unsophisticated 1/4 wave wire.
>
>The Rainbow pc board weighs less than 2 oz and even when
>mounted in an Altoids tin, with a 12 volt lighter battery
>comes in at about 4 oz. The small diameter hookup wire and
>pvc pipe section insulators wire tip the scales at under a
>half pound and fit in a small zip-lock bag.
>
>For 40 or 80, the wire can be as efficient as a dipole when
>erected as an inveted vee or even better, a sloper.
>
>Check the next issue (April but no April fool!) of the NEQRP
>newsletter 72 for an article on the EFHWA (End Fed Half Wave
>Antenna).
>
>And you will *hear* one in QRP To The Field!
>
>
>
>72/73,
>
>Joe E., N2CX
>
>from Southern New Jersey, y'all
>
>work: jeverhart@cayman.vf.mmc.com
>home: n2cx@voicenet.com
>
>
>
>
>
[
QRP-L Archive |
]
[
1993 |
1994 |
1995 |
1996 |
1997 |
1998 |
1999 |
2000
]