On 7/15/2022 10:35 PM, Peder Kittelson wrote:
That is a good question. I was thinking of adding to the answer above.
I called Palstar about a year ago and asked if there was any problem
linking a coax cable through a short length of balanced line. He said
he did not see any problem with that. So I have used the tuner that way
and until now have not had any problem with it that I have noticed. It
is unusual to be sure.
Thanks again for your help,
Peder
On Fri, Jul 15, 2022 at 8:28 PM Dave Erickson <[email protected]
<mailto:[email protected]>> wrote:
On 7/15/2022 10:21 PM, Peder Kittelson wrote:
> The antenna is homemade, in a sense. I bought a 9-1 Balun from
Balun
> Designs with the capacity for a tie into a counterpoise which I
use. I
> have a 30 DB inline RF attenuator attached to the Balun Designs
piece.
> I have run RG213 to my radio room. I have a separate Palomar 9-1
Un-Un
> in the line near my equipment. The EFHW transmission wire is 53
feet
> long. A length recommended for multiband EFHW wires. That
length has
> no natural resonance which would cause problems, according to the
charts
> I have seen.
>
> Thank you for your thoughts
>
> Peder
>
> On Fri, Jul 15, 2022 at 8:07 PM Dave Erickson
<[email protected] <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>>
wrote:
>
> On 7/15/2022 9:53 PM, Peder Kittelson wrote:
> > When on 80 meters, the longer I hold the tune button down the
> higher the
> > SWR goes to the point the KPA500 folds back with warnings. I
> don't usually
> > hold down the tune button longer than about 5-6 seconds.
> >
> > I use a Manual Palstar BT1500A tuner which does a good job of
> tuning my
> > EFHW wire antenna. So the initial tune is very good. I
sometimes
> will hold
> > down the Tune button on the K3s for maybe 5-6 seconds with the
> initial tune
> > at 1-1 SWR.
> >
> > The KP500 first shows a 1-1 SWR. Then 1.2-1, 1.3-1 and so
on. I
> stop when
> > it reaches 1.5-1.
> >
> > I suppose that initially the transmitting wire sends out the
> signal and
> > over time the current backs up. I have torroids in place to
> prevent RFI
> > coming back down the antenna transmission line.
> >
> > I only use the system for CW. So when I send, the problem
does not
> > escalate to the point of a dangerous SWR.
> >
> > I wonder if this is a normal problem when holding the
tuning button
> > longer? And since I do not hold down the key for a long
period
> of time it
> > doesn't develop.
> >
> > Still, I am looking at solutions. And I am concerned.
> >
> > Your thoughts?
> >
>
> Hi,
>
> Are you feeding an EFHW antenna with balanced feed-line? I don't
> believe
> I have seen that done much.
>
> Is your antenna commercial or home made? I'd like to see more
about
> that.
Peder,
I am a little confused I guess, but how does this antenna system work
with the Palstar BT1500A which only has connections for balanced
feed-line?
There is a lot going on there I think.
Peder,
That is a fairly unique arrangement to be sure.
Good Luck, I hope you find the answer.
--
Dave Erickson
AB0R
73
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