[Icom] Re: IC756Pro - mic and cosmetics?

[Chris BONDE]

I was worried when in the summer the temp of the rig with the external 
thermometer (over the vent) was reaching 50 celcius.  I listen a lot.  Tx 
for 10sec (push foot switch, no modulation) the fan comes on cools to about 
30 then quits and the temp goes up again.

Not easy to blow smoke across.  I donot smoke.  :+)}

Chris opr VE7HCB



>Hi,
>Easiest way to see which way air flows is to blow a puff of cigarette 
>smoke briefly.
>The thing is making the air move all the time whether bottom up or top down.
>There once was a mainframe system which had a blower mounted on the top of the
>cabinet and air was blown downward. We used to call it top hat blower. Did the
>cooling job alright.
>73,
>Tony, VE6CGX

:
>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
> >
> >
> > ----
> > Your Moderator: Dick Flanagan W6OLD, icom-owner@mailman.qth.net
> > Icom FAQ: http://www.qsl.net/icom/
>
>----
>Your Moderator: Dick Flanagan W6OLD, icom-owner@mailman.qth.net
>Icom FAQ: http://www.qsl.net/icom/