[ICOM] Icom 781 heat problem

[Adam Farson]

Hi Sam,

There is an alternative: Reduce the mains supply voltage to 100V, using a
Variac or bucking transformer. This will reduce the dissipation of the shunt
regulator in the power supply by a whopping 44%.

I would not recommend drilling holes in the IC-7800 cabinet. The radio is
fast becoming a classic, and such modifications will greatly diminish its
resale value. You can probably fabricate a copy of the PSU heatsink cover
plate, as in the Sherwood mod, cut the necessary holes in your copy, and
mount a small muffin fan on that.

Cheers for now, 73,
Adam VA7OJ/AB4OJ


-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Larry Hogue
Sent: 07 January 2005 12:02
To: 'ICOM Reflector'
Subject: RE: [ICOM] Icom 781 heat problem

http://www.sherweng.com/IC781Fan.htm

Sam Effinger wrote:

> I have my IC-781 apart and want to punch some holes in the rear panel 
> to  mount a
fan to help cool the power supply..
>
> has anyone got any tips on doing this ???
>
> any ideas on the location and how many holes to punch and what type of 
> fan to mount
???
>
> I could buy the Sherwood mod. buy decided to do it myself...
>
> Also I  am one of the guys who used to make the Ekletech remote tuning 
> knob for the
IC-781 and  other radios...If you have any problems let me know..I still
have spare parts..
>
> This is a great place for Icom help...
>
> Life is good...
>
> Thanks for any help..
>
> Sam  K9SD
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net Win a 
> new Icom IC-756 PRO III and help QSL/QTH.net Details at: 
> http://mailman.qth.net/

----
Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net Win a new
Icom IC-756 PRO III and help QSL/QTH.net Details at: http://mailman.qth.net/


----
Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net Win a new
Icom IC-756 PRO III and help QSL/QTH.net Details at: http://mailman.qth.net/


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