[Elecraft] crystal oven question

[Darrell Bellerive]

Interesting discussion! I have been saving up my pennies for a 6 metre
transverter and would like to run it off the K2 internal battery for
portable operation.

I was wondering if I should get the crystal oven or not.

Searching the manual does not give much detail about current draw. The
specs show receive current at about 250 mA which is about the same as my
K2. I'm not sure if this is with or without the oven.

If the transverter is optioned to only turn on the local oscillator when
the transverter is in use, (JP9 1-2) what is the typical drift during
warm up?

How much current is used to power the oven, and to keep the local
oscillator on?

Is it possible and practical to wire JP9 to a rear mounted switch to
manually switch the local oscillator off (JP9 1-2) for portable
operation on HF, but continuously on (JP9 4-5) when on a power supply?
In effect, sacrificing stability for current draw when portable.

What is the power output from the 50 Mhz transverter when driving with
the K60XV, and powering from the K2 internal battery at 3 amps maximum
current draw?

73,
Darrell   VE7CLA   K2 #1973

On Tue, 2004-06-01 at 12:10, AI4CQ ,James wrote:
> A crystal oven consists of a heater in an enclosure for the crystal
> and a temperature controller.  To be able to control the temperature
> with heat a temperature must be chosen which is above the highest
> normal operating temperature which is often more than 100 degrees F.  
> 
> A crystal will drift with temperature but for common cuts of crystal
> not in a linear fashion.  The AT cut which is most common at HF drifts
> in a S shaped plot when plotted temperature vs frequency with the
> center of the S near room temperature. Crystals for ovens used in
> frequency counters are often specially cut so they are most stable at
> the temperature of the oven.   The frequency stability of a crystal in
> a crystal oven is determined partly by the drift characteristics of
> the crystal but mostly by the accuracy of the temperature control.  
> 
> The disadvantage of a crystal oven is it requires power to generate
> the heat and it is not suited for portable equipment.  Usually the
> oven remains on all the time to avoid warm up which is often more than
> 1/2 hour.  
> 
> AI4CQ James
> _______________________________________________
> Elecraft mailing list
> Post to: Elecraft at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/elecraft
> You must be a subscriber to post.
> Elecraft web page: http://www.elecraft.com