My experience with Minicircuits is that they have EXTREME sensitivity to
the AFC line. I'd use a resistor divider from the same battery and a
bypass cap.

Something like a pair of 100K resistors and a 10 uF cap. Naturallly,
ground the cap at the oscillator ground pin.

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Also, the Vcc has to be well bypassed AT THE OSCILLATOR.

These things are very sensitive to any change in the VCC voltage. A
battery is often not all that low of an impedance and so some good bypassing
will help.

Finally, how are you taking the signal off to your analyzer?

I haven't used the POS-900 but in general, these critters want a paasive
50 ohm attenuator right on their output to avoid signals sneaking back and
screwing up the oscillator.


Jim Pennell
N6BIU