[Icom] Re: IC756Pro - mic and cosmetics?

[George, W5YR]

Don't know what the vent ouput temps should be, Chris, but in the 1-1/2
years that I have had my PRO - and it stays on about 14-16 hours each day -
I have never noticed the case becoming exceptionally warm. Did your 735
have an internal power supply? My 765 does and 90% of the internal heat
comes from there, yet the case remains fairly cool to the touch.
I never see any frequency calibration drift so I guess the TXCO is doing
its job.

Unless there is something wrong with your fan control circuitry, I would be
inclined to not worry much about the PRO overheating. If placing a muffin
fan behind to add a little extra cooling for the rear heat sink eases your
concern, then go for it! But it will be just that much more constant fan
noise unless you can get a real quiet one.

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


Chris BONDE wrote:
> 
> Tend to agree.  As long as the rig is cool.  HOWEVER, in the summer time
> (when the living is easy, da-da- daa,) the temp on the therm-oh-meter above
> the vent goes to 40 sumtimes 50 celcius when I am listening!!  When my
> computer is roaring away with 4 fans and the case is cool to touch, I
> wonder about my rig.  Maybe too much so.
> 
> Letting the air vent one way (by convextion) when not Tx then going the
> other way when Tx, is almost like the counterflow lanes in the big smogs
> but without much planning.
> 
> I guess I should ask what would the max temp at the vent on the top front
> of the rig should be?  Not max for destruction but for good long time
> operation.  Probably the reason I am worrying is that my good old 735 got
> too  o   o hot and did not work properly.  It was not until I touched it
> that I realized that it was too o   o    hot.  Freq, etc went every which way.