Back in the old Heathkit and Drake days I simply used a small muffin fan
placed on top of the chassis over the transmitter tubes to help exhaust
some of the heat. Such fans are almost noiseless. I would think that
using such a fan on the Pegasus would do the job without worrying about
turning it off and on with heatsink temperature.
These fans are available at most of the surplus houses that sell surplus
electronics - they are usually dirt cheap and last forever, especially if
you use a small dropping resistor to lower the speed to about 1/2 to 2/3.
72/73, George AMA 98452 R/C since 1964
Amateur Radio W5YR, in the 54th year and it just keeps getting better!
AutoPOWER Systems, Fairview, TX (30 mi NE Dallas) Collin County
QRP-L QRP-ARCI FISTS NORCAL ZOMBIE ARS 10-X 33.2 N 96.6 W EM13RE
Kenneth Hopper wrote:
>
> For long key down sessions TenTec recommends a fan for cooling the
> heatsink. Has anyone ever seen a temp controlled fan for sale that
> clips onto the heatsink? I want to run RTTY and thought it would be
> a good add-on - but I can't find one for sale anywhere.
>
> http://www.cyberguys.com/ sells cooling fans for hard drives in PC's.
> Some of the fan assemblies have a temp sensor etc.
>
> Has anyone adapted a fan from a PC for this purpose?
> TNX,
> Ken N9VV
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