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List:       elecraft
Subject:    [Elecraft] FW:  KPA1500 SWR meter
From:       <ad5a () gvtc ! com>
Date:       2018-04-30 17:45:27
Message-ID: 338f01d3e0ab$075bc300$16134900$ () gvtc ! com
[Download RAW message or body]

Don,

I downloaded the utility and SWR displayed stayed the same, 1.1:1 while the
display on the KPA1500 peaked at 2 to 1, one red light. This occurs around
60C. No problem until then.

73,

Mike AD5A

-----Original Message-----
From: Don Wilhelm <donwilh@embarqmail.com>
Sent: Sunday, April 29, 2018 2:28 PM
To: Mike Crownover <mike.crownover@gmail.com>; Mike Crownover
<ad5a@gvtc.com>; elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA1500 SWR meter

Mike,

Have you looked at the SWR report shown in KPA1500 Utility?
Try that and see whether it shows the same as the display.

There are 2 pieces to the SWR - there is the sensor part and then there is
the display part.
There is a possibility that the sensor is doing OK, but the display end of
things may be what is causing the problem.=A0 KPA1500 Utility uses a differ=
ent
path (but the same sensor) for its display of SWR than the front panel
display.

In either case, it does seem (by my first guess) that there is a solder or
cable connection in the KPA1500 that is heat sensitive.

How high does the SWR go?=A0 If it stays below 1.5, it will cause no problem
despite your concern for that behavior.

Unless I am mistaken, the SWR indication on the K3 shows only the SWR of
what is connected to the K3, which is the amplifier input

73,
Don W3FPR

On 4/29/2018 2:25 PM, Mike Crownover wrote:
> Don,
>
> Thanks for the comment. I=92ve done that test and at low temps,~35c, no =

> difference at 1500 or 500. I haven=92t done it at high temps yet, but I =

> would think if it were arcing, the temp of the amp wouldn=92t matter, =

> although I=92m certainly no expert on these matters. Additionally, I =

> would expect the SWR indicator on the screen to show the fluctuation =

> as well. It never moves from 1.1:1.
>
> Mike AD5A
>



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