[Microwave] Miteq oscillator

[Dr.Gerald N. Johnson]

Probably the heater driver is still saturated at 12 volts. But you can check that by watching the heater current from cold power up. It should remain constant for a while on either voltage. Then taper off. You can probably only speed up the heating by raising the power in the heater coil around the oven. If its a lumped resistor, a lower value (about half) would be appropriate or another of the same value in parallel with the original. Or a second heater wire winding in parallel. Or tap and reconnect the present winding. Tapping may be difficult if its resistance wire, not copper wire.

73, Jerry, K0CQ

Dr. Gerald N. Johnson, Electrical Engineer
----- Original Message -----
From: Stefan Heck [mailto:stef-he at online.no]
Sent: 11/28/2004 4:09:13 AM
To: microwave at mailman.qth.net
Subject: [Microwave] Miteq oscillator

> Hi gents,
> does anybody on this list have a circuit diagram for the Miteq OCXO, model
> XTO-02-106,5-G-20P?
> 
> The frequency is 106,5 MHz and it needs 20 V DC. I would like to modify it
> for operation at 12 V DC, and use it as LO for a 10 GHz XVTR. It seems to
> work even without modification, but I can probably reduce the pre-heating
> time by changing some components.
> 
> 73, Stefan (LA0BY)
> 
> email la0by at darc.de
> homepage http://www.qsl.net/la0by/
> phone +47-67139536, GSM +47-90114432
> 
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