Re: [Elecraft] FW: KPA1500 SWR meter

[Don Wilhelm]

Mike,

I have never had my hands on the innards of the KPA1500, so I can't 
offer much except for you to email supp...@elecraft.com.


73,
Don W3FPR

On 4/30/2018 1:45 PM, a...@gvtc.com wrote:

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.


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[Elecraft] FW: KPA1500 SWR meter

[ad5a]

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 
Sent: Sunday, April 29, 2018 2:28 PM
To: Mike Crownover ; Mike Crownover
; 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.  KPA1500 Utility uses a different
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?  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’ve done that test and at low temps,~35c, no 
> difference at 1500 or 500. I haven’t done it at high temps yet, but I 
> would think if it were arcing, the temp of the amp wouldn’t matter, 
> although I’m 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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