[RTTY] SO1R / SO2R

[Kok Chen]

On 3/26/02 2:34 PM, "Marty Tippin" <nw0l@yahoo.com> wrote:

> Whose gain figures do you use? The manufacturer's or something that more
> closely represents reality?

Anyone using the manufacturers' claims are just disadvantaging themselves,
HI HI.  Especially the ones using 11m antennas on 10m :-P.

It has been shown quite often (see past issues of Communications Quarterly)
that gain of a Yagi-Uda can be pretty well predicted by the boom length.
You can completely ignore the number of elements and come within a dB or
so.

(OK, so the Super-Gain (Uzkov limit) antennas will have a tad of advantage,
but there are not many of those antennas.)

Gain of horizontally polarized HF antennas versus height is also pretty
well establish (there is a slight additional ground gain for a multi-element
Yagi-Uda compared to a dipole, but again it is not that great).

Or, a simple table could be created (dB vs boom length and height).  Same
thing with applying a gain factor to stacks (at least we know what the
ultimate maximum is :-).

Wire antennas (dipoles, EDZ, Vee, Rhombics) can be categorized by
wavelengths.

And we know what the maximum gain of a vertical is :-).  If you don't
live in the middle of the ocean or a salt marsh, too bad :-).

Just use best case EIRP.  That way, contesters will really go optimize
their station, feedlines and antenna losses (like burnt plastic traps :-)
...and flood their county with salt water.

The CQWW "tribander plus wire" is basically an EIRP equalizer within
a couple of dB,  except for the factor in antenna height.

73
Chen, AA6TY