[Swan] Cooling of thy Swan

Sat, 21 Feb 2004 18:02:34 -0600

Hi Ken,
Ya there are lots of ways to make fans multi-speed.
The novelty in this little gismo is that with only
2 wires connected the fan will constantly adjust it's
speed to compensate for differences in temperature.
That from what I'm assuming is a select threshold.
What I don't have the answer to is can that threshold
be manually set. We've all seen "Externally" controlled
fans that will run at high speed until heatsink temps
or whatever we're cooling drop to specific levels but
I've never had the opportunity to mess with one where
all the logic and control circuitry is build into the fan.
Might be "Cool" .... Hi.
Skip
WB4GMQ
-----Original Message-----
From: [email protected] [mailto:[email protected]]On
Behalf Of Ken, WA2LBI
Sent: Saturday, February 21, 2004 05:47 PM
To: Skip Frolik
Cc: [email protected]
Subject: RE: [Swan] Cooling of thy Swan

Skip,

You can accomplish the dual speed fan feature using a conventional single
speed
12VDC fan. Just put a fixed resistor in series with the power supply to set
the
idle speed then short the resistor on transmit using contacts on an external
relay driven from the T/R relay contacts used to key a linear amp.

Ken, WA2LBI
[email protected]

Quoting Skip Frolik <[email protected]>:

> Howdy,
> All this talk about cooling fans made me remember
> that PC Power and Cooling sent me a flier about
> their "Variable Speed" cooling fans. Apparently
> they are "The Thing" now days balancing between
> air movement and fan noise. Sort of a "Constant
> Temperature" control device .... Hi.
> Anyway I might have to order one and see how it works.
> I wonder if the temperature can be set manually ????
> Pick a threshold with the rig idling and then it
> will speed up automatically on those Loooong QSO's
> slowing back down after the temperature drops.
> Ya .... That's the ticket.
> Skip
>
>
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