[Elecraft] Normal KPA500 behavior?

[Bob Wolbert, K6XX]

Sounds like RF is getting into the temperature meter circuit. Probably 
not a big deal, as 5C is only one fan speed step, but might as well 
clean it up.


73 de Bob, K6XX

On 2/10/2012 12:30 PM, Mike Walsh wrote:
> Hi and thanks for the replies.
>
> However, I think people are misunderstanding my question about the TEMP display.  When I hit the key to send a 500 watt carrier the display instantly drops 5 degrees C and instantly goes back up to the real temperature when I release the key.  It's that instant change in displayed temperature that I'm asking about, not the relatively slow increase or decrease associated with the real heating and cooling of the amp.  Do others see that instant decrease on transmit??
>
> 73 and Thanks,
>
> Mike - ke5akl
>
>
> ________________________________
>   From: "n5ge at n5ge.com"<n5ge at n5ge.com>
> To: Mike Walsh<ke5akl at yahoo.com>
> Cc: "elecraft at mailman.qth.net"<elecraft at mailman.qth.net>
> Sent: Friday, February 10, 2012 1:18 PM
> Subject: Re: [Elecraft] Normal KPA500 behavior?
>
>
> 1) With CW carrier; Temperature rises as I hold down the straight key.
> Temerature falls when releasing the key.  While sending CW (dits and dahs)
> Temperature rises.  When I release the keyer paddles the temp begins to fall
> within about 2 seconds.
>
> 73,
> Tom
>
> -- American Indian comment about Daylight Saving Time --
>
>
> On Fri, 10 Feb 2012 11:28:10 -0800 (PST), Mike Walsh<ke5akl at yahoo.com>  wrote:
>
>> Hi,
>>
>> My KPA500 does a couple of things that seem a bit odd.  Other KPA owners - do your KPAs also do the following?
>>
>> 1)  When I transmit a 500 watt carrier while displaying TEMP the displayed temperature drops 5 degrees C.  When I release the key the temperature goes immediately back to the real value.  Lower transmit power levels cause a correspondingly lower drop in displayed temp.  This behavior causes the temp display to bounce around while transmitting CW.
>>
>> 2) When I power down my KPA the fan turns on (as it should) and then the right most POWER LED flashes on an off quickly.  Is that LED flash normal?
>>
>> Thanks and 73,
>>
>> Mike - ke5akl
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