|[AMRadio] New Year's Resolution-Getting Back on AM!|
k5sep at yahoo.com
Mon Dec 25 21:56:12 EST 2006
Thanks very much for all the great info on your
improvements and additions to your G5RV. I do not
think I would have enough space to do what you have
done. However, time will tell.
BTW- I fully agree with K4KYV's statement about the
necessity of using a scope to monitor your AM signals.
That's something else I will have to work on.
When I get to that point I sure do have a great group
of AMer's to guide me!
Talk to you later.
--- ARS W5OMR <ars.w5omr at gmail.com> wrote:
> On 12/25/06, Bob Scupp <k5sep at yahoo.com> wrote:
> > Thank you for the warm welcome and information on
> > activity.
> > Everyone with comments is always welcomed.
> Good to see you again, Bob. Been a while.
> > Actually I have a G5RV antenna. I seem to remember
> > is for 10-80 meters. I was originally thinking of
> > using the tower I mentioned to hold the center
> feed of
> > an inverted V, with the broadsides facing
> > East-West(?). The ends would maybe about 15-20
> > above ground. However, being out here in the
> > with no strict municipal or other restrictions, I
> > also experiment with other antennas.
> > I have never been on 160 meters. Sounds like
> > band on AM to experiment with.
> I ran, for the longest time, an inverted Vee on 75m,
> because of my
> 'restricted' space. Until a year ago (or more, now)
> when I used
> another lenght of wire, attached one end to the
> existing 75m Inv Vee,
> and then closed in the bottom of the antenna . That
> made it a loop,
> with another ~120' of wire, in addition to the 120'
> of wire that was
> up there.
> What I wound up with was a full-wave Delta Loop
> installed in a
> Vertical Plane, and it works great. I am constantly
> amazed by the
> signal reports I get from that antenna.
> I think the biggest gain I got, was when I switched
> from coax to
> ladder-line for feed-line to the antenna. It just
> got that much
> better, when I closed in the loop.
> The actual formula for the loop length is 1005 /
> f(MHz) but when you
> feed it with 50' of 450 ohm ladder line, a lot of
> sins are forgiven.
> Although I don't think it's high enough, 60' is a
> good enough start
> for a center-support for the 450 ohm ladder-line and
> loop feed point.
> (not to mention, it's better than nothing ;->)
> 1005 / 1.9 = 529' of wire. Typically, that would
> work out to around
> 176' per leg. So, you can't make it a perfect
> triangle. So what?
> Stretch it out as far as you can, and feed it at the
> top of the
> antenna. The antenna would work on 160m, it'd be 2
> wavelengths on 75,
> and would exhibit even more gain on the higher
> bands. As long as you
> have a good wire-tuner from the rig to the
> feed-line, you'll be great.
> > I agree with you in that the early predictions for
> > Cycle 24 looks like it is going to be a whooper!
> > Scientists are predicting a peak around 2010-2011
> > 160 for a sunspot peak. I guess my timing is about
> > right on.
> For the higher bands. Nothing more for the lower
> bands, but more noise ;)
> > Again Jim thanks for the advice.
> Jim's a good source, Bob.
> Operating your AM rig without a scope
> is like driving our car at night without
> 73 = Best Regards
> Merry Christmas!
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