[ICOM] 756 ProII Temp Problem

[MikeR]

Bill -
I'm puzzled as to how a slower running fan could result in more cooling.
Less noise, sure. BTW I have a PROII and it does get very warm just sitting
there, but so far (crossed fingers) so good.
73, Mike NF4L
----- Original Message ----- 
From: "Bill Archer" <bfarcher at comcast.net>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Wednesday, September 22, 2004 9:08 AM
Subject: [ICOM] 756 ProII Temp Problem


> As the proud owner of both a 706MkIIG and a ProII I have been following
the
> discussion on cooling the ProII during extend RX periods.
>
> The 706 has a similar problem in that the case temp would get VERY warm
> while in RX. A simple fan mod whereby a 200 ohm 1 Watt resister was place
> between a +12v source and the + lead on the cooling fan. This causes the
> cooling fan to run at a low speed with about 4.7V applied to the fan. The
> effect of this mod is the case temp is reduced by  about 30° F.
>
> It would seem to me that a similar approach could be taken with the ProII
to
> apply a reduced voltage to the cooling fan to achieve the same results.
>
> Since this reflector is blessed with an abundance of talented and
> knowledgeable techno-wizards
> would any of you care to comment on this approach?
>
> KC5GNB
> Bill in Plano
>
>
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