[GPS_Standard] Homebrew TXCO

[Zack Widup]

Not at all.  In fact, there was an article in QEX within the last few 
years of such a circuit.  It used a regular transistor in a TO-220 case as 
the heating element.

The thing is that you want a tuning range of a few Hz at most around 10 
MHz for your tuning voltage range.

I don't think the commercial units have completely dried up.  What you 
want to search for on eBay is "ocxo", not "tcxo". Also try "10811"
and "10544".

I'll ask Pyrojoseph if he thinks he's going to come up with more of the 
Isotemp units. He's a ham, by the way, and is on the microwave reflector.

73, Zack W9SZ

On Thu, 25 Oct 2007, P M Gant wrote:

> As the supply of HP TXCOs has dried up how practical would it be to homebrew
> such a device using modern components? Kuhne sell a useful crystal heater
> and if this was combined with a thermally isolated and heated compartment we
> might end up with something useful. Certainly the pictures of a TXCO
> assembly provide a useful start.
>
> HA5RXZ