[AMRadio] BC-610 terminating impedance


k0ng at inebraska.com k0ng at inebraska.com
Sat Oct 29 17:57:02 EDT 2005


Well said Jim !! There is only one antenna that works well at any given
moment and that is the one that does (work well) if you are lucky.

73, Charlie, K0NG.

Quoting Jim Candela <jcandela at prodigy.net>:

> Bob Wrote:
>
> >Of course I have not pursued a whip installation.  It
> >would seem to be a useless endeavor as the 160, 80,
> 40, >and 20 meter bands are "normally" of horizontal
> >polarization.  I see no logic in operating in cross
> >polarization, and making communications more
> difficult >than necessary.
>
> Hi Bob, I enjoyed your BC-610 thread. It makes me wish
> I had obtained one back when I had several chances. I
> recall a story from Dave, W6PSS when he was moving his
> three 610's in a trailer, and was involved in a bad
> traffic accident. He was OK, but the 610's did not
> fare well.
>
> Now about that polarization issue you mentioned. I had
> long in depth conversations with the late Ozona Bob,
> W5PYT concerning this. What I recall is that when
> receiving skip at HF, the polarization is constantly
> changing, and the QSB you experience is in part due to
> that. The other part is vector addition & subtraction
> from picking up the same signal from different paths,
> phase, and time delay. Bob figured that if he
> transmitted circular polarization this would in effect
> reduce QSB at the receiving end. I recall he had huge
> diagonally mounted turnstile dipoles mounted nearly a
> football field high (the top). At my QTH (Austin), he
> was always on the S-meter peg, and NO QSB. That was a
> distance of 250 miles, day and night.
>
> I myself would be hesitant to put up a 80 meter
> vertical because my buddies close in within Texas
> would have trouble hearing me if they were beyond
> groundwave distance, and before the first hop
> distance.
>
> Now how does KC9VF get out so well? Doesn't he have a
> vertical dipole on 80 meters?
>
> For skip reception, it seems that the transmitted
> polarization, isn't a big issue, but more of a angle
> of radiation issue.
>
> Regards,
> Jim Candela
> WD5KJKO
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