On May 27, 2009, at 1:24 PM, Ron D'Eau Claire wrote:
Good grief! How cool do you want to keep the K2?
...
I have used a 4 square muffin fan sitting in rubber feet on top of
the K2
running at a slow speed, not to keep it any cooler but to avoid the
noisy
little fan on the back from
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Phil Kane
Sent: Wednesday, May 27, 2009 12:51 PM
To: Ron D'Eau Claire
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Successfully using a micro fan to keep K2 cool
On 5/27/2009 10:24 AM, Ron D'Eau Claire wrote:
I have used a 4 square muffin
I happened to have one of these in my parts bins and it seems to work
just fine.
It sets on top of the unit in right-rear, on the heatsync.
I have it limited by a 47ohm resister soldered to the switched DC inside
the unit.
For standard qso usage, it keeps the heatsync just slightly warm to the
I've mounted several sizes of muffin fans to rubber
pipe caps. They're handy for cooling projects and
the rather soft rubber caps won't scratch finishes.
73! Ken Kopp - K0PP
elecradftcov...@rfwave.net
http://tinyurl.com/7lm3m5
How noisy is it ?
One idea I've had for a long time is to remove the elecraft fan on
the rear of K2 and find a hose of the proper diameter, somehow
mounting it in a semi-permanent fashon. at the other end of the
hose, a box with a big fan that can really blast some serious air
through the
Good grief! How cool do you want to keep the K2?
Several years ago I ran some tests for one of the engineers to check the
K2's frequency stability vs. temperature. Several testers and I cycled the
K2's internal temperature by hooking on a suitable dummy load and
transmitting for extended periods
Well, I like mine cool. In my experience, cool equipment has fewer
breakdowns and lasts longer. Not only that, it has less drift.
There is a menu in K2 to calibrate the temperature probe that
controls the fan. I have mine set to a much higher temperature than
what it actually is. This
With so many high volume low speed (and thus low noise) fans out
there, I would have a hard time justifying doing more than setting
one up on the heat sink on top (for 100w version). But operating
styles and locations vary, so YMMV.
73
Dave Wilburn
NM4M
W B Reese wrote:
How noisy is it ?
On 5/27/2009 10:24 AM, Ron D'Eau Claire wrote:
I have used a 4 square muffin fan sitting in rubber feet on top
of the K2 running at a slow speed, not to keep it any cooler but
to avoid the noisy little fan on the back from running.
How are you feeding power to the fan? I have one on top,
: [Elecraft] Successfully using a micro fan to keep K2 cool
Well, I like mine cool. In my experience, cool equipment has fewer
breakdowns and lasts longer. Not only that, it has less drift.
There is a menu in K2 to calibrate the temperature probe that
controls the fan. I have mine set to a much
Mine is connected directly to the power supply too, Phil, but I switch off
the supplies when I leave the shack, so it's off when the rigs are shut
down.
Ron AC7AC
-Original Message-
On 5/27/2009 10:24 AM, Ron D'Eau Claire wrote:
I have used a 4 square muffin fan sitting in rubber
This has been suggested many times by others.. now it is my turn to repeat
it I guess:
I mounted a 12 volt 4 inch muffin fan in a simple enclosure and placed it
on top of my K2 blowing downward. I put a suitable resistor in series with
the 12 volt supply so that the fan turned slowly and
Phil,
Solder some wires to the terminals of D12 inside the K2 (the cathode is
positive 12 volts and turns off with the K2 switch). Make a small notch
in the rear panel above the coaxial power jack sufficiently large to run
the wires through would be my preferred routing for the wire, but make
If someone is looking for something with a bracket, the fan option for the TT
Orion
actually fits very nicely onto the K2/100 heatsink. I used it often especially
when running RTTY.
-
73,
Greg - AB7R
Whidbey Island WA
NA-065
On Wed May 27 13:05 , Ron DEau Claire
Don,
Not to argue with your success, it is generally more efficient to use
the fan to direct air AWAY from the surface to be cooled rather than
toward it. The heat of the fan energy is not added to the air that is
doing the cooling, but then those muffin fans do not add very much heat
I also was a field tester on frequency stability vs. temperature tests. During
one of these tests I set my K2 to 20 watts and keyed it for one continuous
hour. The heat sink was too hot to put my hand on it, but the over-heat
message did not appear. The K2 final transistors are very rugged
It probably doesn't make much difference, but I have the fan pushing air
upward so it doesn't fight the air coming out of the slots at the forward
end of the heat sink driven by the small fan when it is running.
The fan draws air in along the fins from the sides and expels it upward. I
added a
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Phil Kane
Sent: Wednesday, May 27, 2009 12:51 PM
To: Ron D'Eau Claire
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Successfully using a micro fan to keep K2 cool
On 5/27/2009 10:24 AM, Ron D'Eau Claire wrote:
I have used a 4
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