[Lowfer] Temp control...

[Eric Smith]

Hi, Kurt,

Looks like you guys have plenty of good ideas already.  I just wanted to 
point out Lyle K0LR's use of a PTC thermistor alone in his (now obsolete 
in favor of the ZL1BPU LF exciter ... but that's another story :)  
"All-in-one" synthesized LowFER transmitter.

Check out the clock reference portion of the circuit.  He is using a 
crystal here, and solders the thermistor to the can.  But he also mentions 
using epoxy or your favorite adhesive.  He has a good description.

I'm fairly certain he used this for very slow QRSS and was stable enough 
for that.

The link is http://www.cpinternet.com/~lyle/all-in-one/all-in-1.htm

I haven't tried this, but was considering it for my own wandering hifer.  
Instead of the mitten he mentions for the xtal I was considering a small 
foam block with cavity carved out to stick over the oscillator and epoxied 
thermistor to fit snug against the board.

Please let us know what you end up doing.

73
Eric, KD5UWL