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Re: (THANKS) Thermistor Question, Drake 2880



Hi to the Group...Thank you Dave, Mike and Mahlon...appreciate you 
assistance and insight to my dilemma......

73's to all..

Lonnie (NT6B)
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At 09:05 AM 6/13/2001 -0700, Dave Guimont wrote:

>>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.
>Hi Lonnie,
>
>I built the sig source from DEM, and it uses a trnsistor soldered to the 
>crystal to
>so just that.  Not sure at the minute what voltage is applied, but it does 
>get hot!
>Draws a lot of current until it gets hot (as I remember), then the draw 
>goes down...
>
>            73, Dave wb6llo@amsat.org
>                    Disagree: I learn....

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