All --
You might find this page useful: http://www.irlpcables.com/alinco_drxx5t_mobile.html
I agree with Randy – when it comes to “cooking my finals”, I prefer a simple solution. If you really want to do it right, use a normally-open thermostat to control the fan power and a normally-closed thermostat to control the transmitter main power. J (obviously with values of operation far enough apart NOT to fall into each other’s dead-band!)
73,
john
____________________________________________
John K Scoggin, Jr. W3JKS/AAT3BF/AAM3EDE/AAA9SL
"WLMM - Sic faciunt omnes (Winlink 2000, Everyone is doing it.)"
US Army Military Affiliate Radio System
Delaware Gateway Station AAB3DE
Special Consultant - Technology
Emergency Operations Officer - Delaware
ARRL Assistant Section Manager - Delaware
Email: aat3bf@armymars.net
Telephone: (302) 451-5000
-----Original Message-----
From: app_rpt-users-bounces@qrvc.com [mailto:app_rpt-users-bounces@qrvc.com] On Behalf Of Randy Hammock
Sent: Thursday, April 02, 2009 1:41 PM
To: app_rpt-users@qrvc.com
Subject: Re: [App_rpt-users] URI's I/O fan control
On Apr 1, 2009, at 6:33 PM, Will Wright wrote:
> Hello to the group,
>
> I wonder if anyone would like to share a timing circuit and it's
> programming use with one of the URI I/O pins, lets say to control a
> fan
> to keep the transmitter cool on transmit and off when not in transmit.
> Thanks
I prefer mounting a thermal switch on the heat sink of the
transmitter. This way, the fan is controlled by real need, not some
imagined arbitrary need. When the ambient temp is cool, the fan runs
very little. When the ambient temp is elevated, the fan runs longer.
But the transmitter stays a comfortable temp.
--
Randy Hammock KC6HUR
If there are no horses in heaven, then when I die, I want to go where
they went.
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