[Elecraft] OT: The Great KPA Fan Mystery

[Lyn Norstad]

You just answered the question, Dave - and it's a two-fold solution for the
KPA500:

1)  There is likely less dust on the top than in the rat's nest of wires and
cables found behind the unit (at least that's the case with mine, since it
sits within a small shelving unit), and
2)  You can easily lay a filter pad on top of the KPA500.

Problem solved. You're welcome.

73
Lyn, W0LEN


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Dave Cole
Sent: Thursday, April 30, 2020 2:40 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] OT: The Great KPA Fan Mystery

I wish you all had included a filter slot...  :)

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 4/30/20 12:06 PM, Wayne Burdick wrote:
> For each product, we experimented with air flow direction and many other
variables. The current configurations produced the fastest and most
consistent cooling.
> 
> 73,
> Wayne
> N6KR
> 
> 
>> On Apr 30, 2020, at 12:01 PM, Andy Durbin <a.durbin at msn.com> wrote:
>>
>> "Why does the KPA500 suck air from the top vents and blow it out the
back"
>>
>> I asked quite a while ago what thermal analysis had been performed on the
KPA500 and got no answer here.   It would seem reasonable for the fan to
augment natural convection rather than oppose it.
>>
>> Kenwood built a batch of TS-590SG with the fans installed backwards but
eventually they corrected the mistake in production.  I don't think Elecraft
ever decided the KPA500 fan was the wrong way round.
>>
>> Now for a KPA500 mystery question - does heat flow from the Z bracket
into the heatsink or does it flow from the heatsink to the Z bracket?
>>
>> 73,
>> Andy, k3wyc
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