[Elecraft] Antenna for Travels?
Mike Morrow
[email protected]
Tue Dec 30 13:09:05 2003
Jime wrote:
>An OT I chatted with on 2m a few weeks ago told me his solution -- a
>collapsible fly fishing pole strung with wire. He said he had traveled
>all over the world with it and found it to be quite effective,
>especially with suitable loading coils for the lower frequency bands
>and a decent ground.
Ah, there's the rub! A decent ground for an HF vertical, portable or
otherwise, is difficult to obtain. Plus, the losses in any loading coil
system can be very significant.
That's why I like the dipole. No ground needed. And losses are low too, if
you avoid traps as I do by using manually positioned jumpers around
insulators to change bands. For low transmitter power, these are qualities
that one needs.
I insist on a resonant dipole fed with coax, not twin-lead. The performance
of a random length dipole fed by twin lead requires some type of balanced
antenna tuning, yet most commercial tuners use the old ferrite core balun,
which is a kludgy approach. Also, the routing of the twin lead has a big
effect on the system that you won't experience with coax.
Dipoles...gotta love em! They're a happy combination of high performance,
simplicity, small stowed size, and extreme low cost.
73,
Mike / KK5F