[Icom] Re: IC756Pro - mic and cosmetics?

[Andy Wallace]

Simple--the TFT screen gets hot too and the air is pulled down by it and to
the rear by a temperature activated fan, not convection.

Andy K5VM

----- Original Message -----
From: "Chris BONDE" <ve7hcb@rac.ca>
To: <icom@mailman.qth.net>
Cc: "George, W5YR" <w5yr@att.net>
Sent: Monday, April 29, 2002 7:26 PM
Subject: Re: [Icom] Re: IC756Pro - mic and cosmetics?


> George:
> I think that you are the first to mention that the vent at the top is
> intake rather than exhaust.  To me that is rather a poor design, since
heat
> tends to raise.  I have placed my sweaty palm above the vent and thought
> that the air was moving up out of the vent.  Even when I Tx the sensation
> was the same.  However, I took your advice and tried the Keelex text.
>
> I used a virgin piece of Kleenx, placed it very carefully  over the vent,
> it just sat there.  Turned on Tx, still just sat there.  A ha, I was
> right.  But to be fair, I took the extra portion off the tissue so that it
> was only single ply.  (Now everyone knows what single ply does when you
> blow into it.  It opens a very nice hole from whence everything
> eminates!!)  Further, I made the size of the single py tissue the same
size
> of the vent, carefully placed it over the vent and obseved.  IT DID NOT
> MOVE.  Watched again.  A ha, the tissue moved up.  Then I turned the TX
> on.  Chagrin!!  The tissue moved down into the vent.  Oh, just an
> aberation, do it again.  So I did, and so I did and so I did.
>
> Yes, I believe that you are correct. The fan sucks the air down through
the
> top vent, the vent with the hottest part closest to it, the top vent.  I,
> in my dazed understanding of convection do not understand why such would
be
> so designed.  So, alas and alack, I shall go back to my design board
(where
> is it?) and see if I can place the fan on the back of the rig.  Hey, that
> would be better!!  It would be out of sight and I could put my log book on
> top of the rig. ( <:+)}  )
>
> Chris opr VE7HCB
>
>
>
> At 11:11 PM 2002-04-27 -0500, you wrote:
> >Chris, unless I am mistaken, the front top opening is not a vent, it is
the
> >intake for the internal fan. Heated air is exhausted out the back of the
> >rig after passing through the PA compartment, etc. With the fan running
lay
> >a small bit of Kleenex or whatever on the opening and note that air is
> >moving IN and not being exhausted out.
> >
> >Maybe I have it wrong, but that has been my observation. I can't ever
> >recall feeling heated air coming OUT of the top opening.
> >
> >73/72/oo, George W5YR - the Yellow Rose of Texas
> >Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
> >Amateur Radio W5YR, in the 56th year and it just keeps getting better!
> >QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
> >Icom IC-756PRO #02121  Kachina 505 DSP  #91900556  Icom IC-765 #02437
>
>
> ----
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