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]>> 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.
--
Dave Erickson
AB0R
73
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