Re: [Repeater-Builder] Fan Temp Switch

[Eric Lemmon]

I have several installations in service using the same thermal switch.  It
is #317-1094-ND from Digi-Key, for $9 each.  This switch closes at 122
degrees F, and opens around 100 degrees F.  I drilled and tapped two holes
in a flat area of one of the radio's heatsink fins, and mounted the switch
with thermal contact grease to ensure a good heat transfer.

Be careful in your selection of a fan.  After having one (rather
inexpensive) DC fan that caused the RF to be modulated with a hum, I now
buy only those fans that are certified to be free of conducted EMI.

73, Eric Lemmon WB6FLY

kc4wgh wrote:

> Back again.  Any suggested on a vendor for a temperature switch to
> turn the 12 vdc fans ON and OFF.  I used a test setup this morning
> with some stud mounted temperature switched and a temperature device.
> They make-up at 150 degree F, and opens at 120 degree F.  I think this
> is allowing the heat sink to get too HOT!  Thanks...
>
>
> Yahoo! Groups Links
>
>
>
>






 
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Re: [Repeater-Builder] Fan Temp Switch

[rrath]

Try Digi-Key at digikey.com

Rod


> 
> 
> Back again.  Any suggested on a vendor for a temperature switch to 
> turn the 12 vdc fans ON and OFF.  I used a test setup this morning 
> with some stud mounted temperature switched and a temperature device.  
> They make-up at 150 degree F, and opens at 120 degree F.  I think this 
> is allowing the heat sink to get too HOT!  Thanks...
> 
> 
> 
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 







 
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RE: [Repeater-Builder] Fan Temp Switch

[Ralph Hogan]

For the fan application, you can purchase from digikey
http://www.digikey.com/ over the web or landline a CANTHERM bimetal temp
normally open switch which will close when the temp reaches the desired
setpoint. Has spade lugs for connection. Remember to apply a dab of heat
sink grease when mounting. They are in the $8-10 range. Note they are rated
in degrees C, so you'll have to convert to degrees F to pick the right
one!!! Heres a link to a java script:
http://www.nomoreodor.com/celsius_to_fahrenheit_conversion.htm
The part number will be 317-109X-ND, where X selects the temperature. The
one I picked was 104 degreeF range if I remember right. Take into account
the ambient temp range of the installation you are in when selecting the
setpoint temp. A setpoint too low would keep the fan on all the time in an
uncooled repeater shack in Phoenix AZ.


73's
Ralph W4XE


-Original Message-
From: kc4wgh [mailto:[EMAIL PROTECTED]
Sent: Friday, April 08, 2005 11:07 AM
To: Repeater-Builder@yahoogroups.com
Subject: [Repeater-Builder] Fan Temp Switch




Back again.  Any suggested on a vendor for a temperature switch to
turn the 12 vdc fans ON and OFF.  I used a test setup this morning
with some stud mounted temperature switched and a temperature device.
They make-up at 150 degree F, and opens at 120 degree F.  I think this
is allowing the heat sink to get too HOT!  Thanks...








Yahoo! Groups Links














 
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Re: [Repeater-Builder] Fan Temp Switch

[Tony King, W4ZT]

My apoligies, I meant to include the URL: 


I have used the switch shown here on an earlier Mastr II mobile
conversion I did. This switch closes at 110F and opens at 90F.  73, Tony
W4ZT

kc4wgh wrote:

>Back again.  Any suggested on a vendor for a temperature switch to 
>turn the 12 vdc fans ON and OFF.  I used a test setup this morning 
>with some stud mounted temperature switched and a temperature device.  
>They make-up at 150 degree F, and opens at 120 degree F.  I think this 
>is allowing the heat sink to get too HOT!  Thanks...
>  
>






 
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Re: [Repeater-Builder] Fan Temp Switch

[albemarle7]

FAN SWITCH...I use Airpax Series 6700. http://www.airpaxtsp.com/tspsite/6700.html. 
They are available in a number of temperature settings. Size TO220 package. I 
drive a 12 volt relay with mine, then I can control anything with relay 
contacts.  Not bad price $6.85 each. Part No 67F040 (40 deg C). You 
might want a little higher trip point. Purchased from Sager Electronics, 
Middleboro, Ma <508 947->. Am presently installing one on the inside 
of the heatsink in a Moto Micor Mobile repeater, near the power output 
transistors. Also try Jim Breuer at Airpax Corp in Frederick, Md phone 
240-379-1346 or www.airpax.net.  I also 
install them in Astron supplies. Mount it inside the Astron between the two 
power transistors on heatsink. I use the screw that holds the standoff for 
the equalizing resistors. One on each side. So if things get too hot it gives 
switch closure, relay will turn on fans. 
Gary K2UQ
[EMAIL PROTECTED]
 













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Re: [Repeater-Builder] Fan Temp Switch

[Tony King, W4ZT]

I have used the switch shown here on an earlier Mastr II mobile 
conversion I did. This switch closes at 110F and opens at 90F.  73, Tony 
W4ZT

kc4wgh wrote:

>Back again.  Any suggested on a vendor for a temperature switch to 
>turn the 12 vdc fans ON and OFF.  I used a test setup this morning 
>with some stud mounted temperature switched and a temperature device.  
>They make-up at 150 degree F, and opens at 120 degree F.  I think this 
>is allowing the heat sink to get too HOT!  Thanks...
>  
>





 
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[Repeater-Builder] Fan Temp Switch

[kc4wgh]

Back again.  Any suggested on a vendor for a temperature switch to 
turn the 12 vdc fans ON and OFF.  I used a test setup this morning 
with some stud mounted temperature switched and a temperature device.  
They make-up at 150 degree F, and opens at 120 degree F.  I think this 
is allowing the heat sink to get too HOT!  Thanks...







 
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