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Re: Kuhne QH40A crystal heater problem

on6ab
 

Hi, as stated before, a crystal, manufactured to be used at room temperature is not very well suited to put in an oven.
Below you see a typical stability range of such a crystal.
image.png
If you put this crystal in an oven at 40 degrees, you're trying to keep it stable at a non-stable temperature. Not exactly a smart thing to do.
Crystals to put in a 40 degrees oven are MADE for this, they will show the flat part of the curve at 40 degrees, not at 20 degrees.

Op wo 5 jan. 2022 om 17:47 schreef k9wkj <k9wkjham@...>:

i made the sleeping bag for both of my 847s


keeps the swing down to pretty low numbers
I made a homebrew crystal heater for my TEN-TEC 526
out of a little metal clip and a 40C Positive Temperature Coefficient Thermistor
Amphenol #?YQS5745PTO? ?it has a 3C temp swing around 43C

just did not find that necessary on the 847
maybe if one was driving a transverter it might require more help

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