I don't think anyone was proposing taking on a new cooling design for the
KPA500. The heat sink is there. The conduction path between the finals and
the heat sink is what it is. The fan is selected and the fan speed
temperatures are defined. The only speculation is whether the flow
bad engrish there. it "will be" not "should be"73
On Fri, May 1, 2020 at 3:08 PM Christopher Hoover wrote:
> I think we're getting far off the topic of Elecraft
>
>
> The operating point for forced air cooling of a system should be the point
> where the fan curve intercepts the
I think we're getting far off the topic of Elecraft
The operating point for forced air cooling of a system should be the point
where the fan curve intercepts the system resistance curve.
The fan curve comes from the fan vendor.
The system resistance is measured on a flow bench in the lab,
My comment NOT about Elecraft cooling design, but:
I am finding a lot of amplifier designs place fans to exhaust heated
air with cool air being drawn into the heat sink by the partial
vacuum created by the fans.
My 6m converted Harris ch.2 TV linear is set up this way (amp has
openings in
With a little searching online, you can find ultra-fine dust screens
that do not reduce volume too much that are also very thin, and can
be temp mounted on the intake vents without radically injuring the
aesthetics.
IF you care less about aesthetics and more about performance, I can
Wayne is correct (of course). Thermal performance VERY often runs
altogether in opposition to intuitive thinking on the application.
__
Clay Autery, KY5G
(318) 518-1389
On 04/30/20 14:06, Wayne Burdick wrote:
For each product, we experimented with air flow direction
: [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 e
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
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 wrote:
>
> "Why does the KPA500 suck air from the top vents and blow it
"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
Why does the KPA500 suck air from the top vents and blow it out the back,
and the KPA1500 sucks air from the back and blows it out the top vents?
Was there a coup in Elecraft engineering? Will future Elecraftologists be
looking for overwritten cartouches on the fan control boards? And who,
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