[Lowfer] Two new photos added to the Picture Gallery.

Bill Ashlock [email protected]
Mon, 15 Mar 2004 23:52:59 -0500


Kurt,

Proof that one picture is worth a thousand words! Quite a different 
environment compared to what we have here in the eastern US!

>The transmitter box will be mounted at the base with a beehive insulator 
>and short wire jumper to >the antenna and ground.

Why not locate the transmitter inside the house where the temperature is 
relatively constant? There's another factor I haven't seen mentioned on any 
of the discussions relating to xtal temperature stability is that all of the 
xtal spec sheets I have looked at indicate the temperature coefficient has 
been tuned by the manufacture to be lowest at room temperature. The TC plot 
looks like an inverted hump with 24C at the bottom. (I suppose this relates 
to the fact that the low-cost xtals are designed for microprocessor 
applications) So the final stability is not only related to how well you 
keep the temperature constant but also how close to 24C you are operating.

Bill

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