[ICOM] 756 ProII Temp Problem

[K2SNJ]

I don't see what all the fuss is about. I have the 756pro for two years now
it runs 12 hours everyday, yes it gets warm but the radio has proper vents
in the cover of the radio to cool it the proper way. Who the hell wants fans
mounted all over there radio and fans running all the time. Don't you think
the engineers that build these radios have some idea of what they are doing.
You guys are like monday morning quarterbacks.


----- Original Message -----
From: "Bill Archer" <bfarcher at comcast.net>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Wednesday, September 22, 2004 9:17 PM
Subject: Re: [ICOM] 756 ProII Temp Problem


> Mike,
>
> Sorry I was unclear.  The cooling fan only runs during TX ( or at least
that
> is my understanding). By applying a lower voltage to the fan during RX you
> will get some airflow without the noise of a full speed fan and when the
fan
> control calls for max cooling the full 12v is delivered to the fan. I have
> been reading the suggestions for externally mounted fans to provide RX
> cooling and it seemed using the internal fan made more sense if it were
> possible.
>
> Did that make any more sense?
>
> Bill
> ----- Original Message -----
> From: "MikeR" <nf4l at nf4l.com>
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Sent: Wednesday, September 22, 2004 17:26 PM
> Subject: Re: [ICOM] 756 ProII Temp Problem
>
>
> > 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
> > >
> > >
> > > ----
> > > Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> > > Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > > Icom FAQ: http://www.qsl.net/icom/
> > >
> >
> >
> > ----
> > Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> > Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > Icom FAQ: http://www.qsl.net/icom/
> >
>
>
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
>