[amsat-bb] Thermistor Question, Drake 2880

[Lonnie Movius <nt6b-vk7lm@xxxxxxxxxxxxxx>]

Hi to the group....sometime ago, I read here on the BB about the 
installation of a Thermistor for controlling temperature for the 
crystal...the particular one was on a Trans System Downconverter...The 
Thermistor is Part number Digi Key KC004P-ND which happens to be available 
in two temp ranges, 50 and 60 degrees.

I selected the 60 degree device as the part number suggests and the specs 
suggests that the component is a 25 volt device.  We installed the 
Thermistor in a Drake 2880 and much to my surprise with only 12 volts 
applied, this little devil is to HOT to touch.

My question for the group is...should the device be this hot...at 60 
degrees?  Or should a resistor be applied to drop the voltage even further 
than 12 volts.  Anyone done this mod that can shed some light on the 
subject?  Talk about cooking the crystal!!  The voltage to the unit will 
remain off till I can get some clarification.

73's to one and all..

Lonnie  (NT6B)

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