Hi.
I know what the theory says, but I just eliminated my balun and had a lot
fewer problems.
73, de Lou K2LKK
At 08:14 AM 4/3/2006 -0400, you wrote:
>They also are known for breaking in the ballum area, I had one do
>that to me though the new one hasn't been too bad yet knock on wood.
>I'll fix my old one soon though just in case.At 11:43 PM 04/02/2006, you
>wrote:
> >Hi.
> >
> >That is correct, because anything that changes the dielectric constant
> >between the two conductors affects the impedance of the transmission line
> >and probably the velocity factor as well, and it affects the way that it
> >tunes. Proximity to other metal objects such as other antennas, chain link
> >fences, and even aluminum siding on houses can cause all kinds of problems
> >with this type of antenna. I have even found that because this is
> >essentially a reactive load, even the length of the coax can make a big
> >difference. I had trouble with mine on 15 meters until I added 10 feet of
> >coax! That is why there is a recommendation to get it as far up in the air
> >as possible. Many of these variables become insignificant if you can get
> >it way up there, but if you can't (like myself) then you just fudge with it
> >until you strike a happy medium that you can live with. A 9 to 1 SWR is
> >pretty high, but some manual tuners can still handle that.
> >
> >Also, I've discovered that after a couple of years the wire that they use
> >in some of these G5RVs can stretch pretty significantly. Mine moved so
> >much that the resonant point was at 3.2 MHz on 80 meters! I am in the
> >process of redoing mine with copper weld wire which tends to stretch less.
> >
> >73, de Lou K2LKK
> >
> >At 07:47 PM 4/2/2006 -0700, you wrote:
> > >Hi
> > >
> > > This sounds a little strange but you might try cleaning the
> > latter line.
> > >I have heard that can be an issue with this type of feed line.
> > >
> > > God bless,
> > > Mark WZ0K
> > >God loves you!
> > >My personal prayer book.
> > >Add your prayer or pray for others at the following link.
> > >http://prayerbook.homewithgod.com/cgi-bin/prayerbook/multi.pl?13196
> > 1113534708:24:0
> > >
> > >http://lists.topica.com/lists/funhamradio.
> > >http://groups.google.com/group/funhamradio-list
> > >
> > >http://funhamradio.bloki.com
> > >----- Original Message -----
> > >From: "Louis Kim Kline" <[log in to unmask]>
> > >To: <[log in to unmask]>
> > >Sent: Sunday, April 02, 2006 2:06 PM
> > >Subject: Re: antenna problem
> > >
> > >
> > > > Hi Tom.
> > > >
> > > > Yes, I think that brushing up the R7 to get the corrosion out of the
> > > > joints
> > > > could make quite a difference. It's probably a first step in trying to
> > > > get
> > > > that antenna going. As for the antenna tuner in the TS850S, if it is
> > > > anything like the auto tuner in the TS450S and TS690S, it is probably a
> > > > pretty tolerant antenna tuner. I personally think that the AT450
> that is
> > > > used in the two radios that I just mentioned is a real gem, and it
> > > > sometimes even outperforms the MFJ993 tuner that I have. Keep in mind
> > > > that
> > > > when trying to debug the G5RV, the ladder line cares a lot more
> > about what
> > > > is around it than coax fed antenna systems do, so try to look and
> see if
> > > > there are any metal objects near it that could be affecting it. G5RVs
> > > > work
> > > > best when they are up in the free and clear, but few of us have that
> > > > luxury.
> > > >
> > > > 73, de Lou K2LKK
> > > >
> > > >
> > > >
> > > > At 12:54 PM 4/2/2006 -0700, you wrote:
> > > >>Thanks for all six of the responses I have received so far. The Kenwood
> > > >>850 has an internal antenna tuner. It worked fine last year at
> Handihams
> > > >>radio camp in Malibu. That was with a G5RV. The R7 is just like it was
> > > >>when I acquired it from the estate of silent key Bob Larson, except for
> > > >>one joint half way up the mast and the 10 radials at the base. Would
> > > >>polishing up the surface do any good or does rf not care? I
> couldn't use
> > > >>it San Francisco because my lot was only 22 feet wide, but now I
> have 75
> > > >>by 300 feet. First I'll try the suggestion from two of youto put
> the twin
> > > >>lead straight and perpendicular to the long line, but at an angle
> to the
> > > >>ground. I's new and connects directly to the transmitter. I've used two
> > > >>different coax cables on the R7 with identical results. The ground is
> > > >>fine. I could get the G5RV higher if I could figure out what to use
> as a
> > > >>non-metallic mast. Any ideas? Would it be worth buying an external
> > > >>antenna tuner to use instead of the internal a t in the K850?
> > > >>Again, thanks for all the quick help. I don't stay on this list because
> > > >>there is too much traffic for me to add to what else is coming through,
> > > >>but it is great to get back on now and then. I'm always available at
> > > >>[log in to unmask]
> > > >>Tom Karnes K6FUN
> > > >>73
> > > >
> > > > Louis Kim Kline
> > > > A.R.S. K2LKK
> > > > Home e-mail: [log in to unmask]
> > > > Work e-mail: [log in to unmask]
> > > > Work Telephone: (585) 697-5753
> > > >
> >
> >Louis Kim Kline
> >A.R.S. K2LKK
> >Home e-mail: [log in to unmask]
> >Work e-mail: [log in to unmask]
> >Work Telephone: (585) 697-5753
Louis Kim Kline
A.R.S. K2LKK
Home e-mail: [log in to unmask]
Work e-mail: [log in to unmask]
Work Telephone: (585) 697-5753
|
