Bill via TowerTalk <mailto:towertalk@contesting.com>
Wednesday, April 08, 2015 6:51 AM
Roger makes a good point about which antenna to choose.
To me gain and a low SWR was most important. Where I have lived, F/B has
never really mattered. In fact, a low F/B ratio is pretty good to have if
you are a contester either in FL .
>From FL, 40 degrees is EU which means the back faces the South
Pacific...not much QRM from that direction. JA is around 325 degrees,
which means the
back of the beam faces South America...not a big deal either. And,
because the F/B is not all that great, in contests I get lots of calls
from VK/ZL
when I'm beaming EU. The same is true for SA when I'm beaming JA.
Now, if I lived in W1-land F/B would be quite important. I doubt I'd want
to hear W4s and W5s while running EU.
As always, one size does not fit all. It's critical to do some serious
thinking about your location before buying that antenna.
K4XS/KH7XS
In a message dated 4/8/2015 8:13:42 A.M. Coordinated Universal Time,
K8RI-on-TowerTalk@tm.net writes:
It depends on the type of operation and your location.
With a few notable exceptions and the power you run, MOST multi element
antennas have enough/ample gain. Needing a rugged antenna narrows the
field. We don't have a lot of wind and I believe we are still in a 70
MPH area, but heavy ice is not uncommon.
>From Central MI when pointed at the DX short path (except South
America) There are heavily populated areas putting strong signals when
the bands are open, So in my case the preferences favor F/B with a
fairly wide (and low) SWR curve over absolute gain.
Antennas are both pricey and heavy. The C31XR takes a couple of healthy
hams to put in place as does the
SteppIR. A nearby ham has a SteppIR and it took a crew to carry it to
the tower. It took several to hold it while he attached the tilt
plate. I think its been up around 5 years and I believe he has been
able to do all or most servicing by himself since then. He occasionally
shows up on here so he might make a comment.
I 'm sure he likes it, but haven't had any discussions with him about it.
Different bands, but I've found even the rather small F/B of sloapers on
75 and 40, as well as the low angle off a good vertical allowed me to
work stations I couldn't hear for stateside QRM with dipoles. It's less
of a problem on the higher bands, but it's still a problem most times.
IIRC you don't have to sacrifice much forward gain to get a good F/B.
I'm not talking about designing for max F/B, but a reasonable compromise
of good F/B and low SWR over the areas I operate. I think the gain
should still be "good enough". OTOH I don't have the time, money,
equipment, or expertise to find out for sure.
I have far too many projects and too little ambition to do them justice
when it takes me 20 minutes just to install a UHF, or N-type crimp
connector.<:-)) Maybe I should consider the big SteppIR with 6 meters.
Then there would be an excess 45G in the neighborhood that currently
only holds sloapers.
73
Roger (K8RI)
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