[ICOM] 756 ProII Temp Problem

[MikeR]

Thanks for the clarification guys. Makes sense now.
73, Mike NF4L

----- Original Message ----- 
From: "D C Macdonald" <k2gkk at hotmail.com>
To: <icom at mailman.qth.net>
Sent: Wednesday, September 22, 2004 10:08 PM
Subject: Re: [ICOM] 756 ProII Temp Problem


> I suspect that continuous fan operation at a slower
> speed (and noise) actually gives  MORE  total cooling
> air in the long run than the intermittent higher speed
> operation.
>
> Mac, K2GKK/5
> Oklahoma City
>
>
>
> ----Original Message Follows----
> From: "MikeR" <nf4l at nf4l.com>
> Reply-To: ICOM Reflector <icom at mailman.qth.net>
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Subject: Re: [ICOM] 756 ProII Temp Problem
> Date: Wed, 22 Sep 2004 18:26:49 -0400
>
> 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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