Hi Larry,
Yes, exact same problem is there with a known good dummy load in place of
the Steppir yagi I normally use.
--Ed—
Sent from Mail for Windows 10
From: Larry (K8UT)
Sent: Monday, June 15, 2020 10:09 AM
To: Ed G; [email protected]
Subject: Re: [Elecraft] KPA1500 Operation on 6 Meters
Ed,
Not seeing that here. SWR value unchanged at 10, 20, 30, 35 watts of
drive. Suggest you test into a dummy load to see if the problem goes
away, which would suggest some issue with power level into the feedline
or antenna.
-larry (K8UT)
------ Original Message ------
From: "Ed G" <[email protected]>
To: "[email protected]" <[email protected]>
Sent: 2020-06-15 9:48:55 AM
Subject: [Elecraft] KPA1500 Operation on 6 Meters
>Folks,
> I am trying to understand some odd KPA1500 operation on 6 meters. When
> setting the power output of my K3 to give varying amounts of drive to the
> KPA1500, I am seeing SWR as displayed on the KPA1500 changing by a
> significant amount depending on the drive level. This is with the KPA1500
> tuner bypassed. An LP-100A on the output of the KPA1500 is also used and
> displays the correct low SWR at all drive levels that I would expect to be
> seeing on the KPA1500 display.
> For example, with 5 watts drive from the K3, I see 1.3 SWR on the
> LP-100, and 2.5:1 on the KPA1500 display. As I increase drive, the KPA1500
> SWR display goes down proportionally, until I get to about 40 watts drive. At
> the 40 watt drive level, I am seeing a nice healthy 1600 watts output, and
> both the LP-100 and the KPA1500 are showing the same 1.3 SWR. 15 watts drive
> shows 1.3 on the LP100 and 2.0:1 on the KPA1500 display. So I am not sure why
> the SWR sensing and display in the KPA1500 is behaving this way? I do not
> see this oddity on any other bands.
> I might also add that attempting to get the KPA1500 internal tuner to
> bring down the high SWR as seen on the KPA1500 results in a drop in SWR
> displayed on the KPA1500 to where SWR almost equals that on the LP-100, but
> using the tuner I would expect that to be even better.
>--Ed—
>
>
>
>
>--
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