I tried an AC muffin fan on my KPA100 ... while it worked wonders
keeping the heat sink cool when I was using the K2 for RTTY, it induced
hum. I switched to a brushless DC fan from an old computer and it
solved the problem. I can't tell you if the K2VCOSHLDKIT would work or
not since I opted for another solution. The DC fan was inaudible
acoustically. I fastened it down with a little tab of velcro, blowing
down onto the heat sink.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 11/7/2018 6:24 AM, [email protected] wrote:
On Wed, Nov 7, 2018 at 7:51 AM, Steve Kavanagh via
Elecraft<[email protected]> wrote: I was experimenting with an
external 120V AC fan to improve the cooling of the KPA100 during CW Sweepstakes this
past weekend. The cooling worked fine but the fan caused some hum on received
signals (and presumably my transmitted signal as well). Placing the fan towards the
right and back (away from the speaker) reduced the hum to a pretty-much unnoticeable
level for CW, though through careful checking on a very strong signal I could still
detect it by ear. I haven't tried it yet but I suspect it isn't good enough for FT8.
I assume the K2VCOSHLDKIT would fix this. But I also noticed, going through
the archives that Eric had suggested a DC fan in the same location. Does
anyone know if I might expect less hum from a 12V DC fan?
73,
Steve VE3SMA
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