I've also observed................it you are not using the auto mode on your
spectrum analyzer, meaning if you have too fast of a sweep rate for your
I.F. bandwidth, you will see the results that you are running into. I use an
HP 8558B, and if I set the SA improperly, I will see the same results. Try
slowing down the sweep rate if you haven't done so.

Pete

"Jim Pennell" wrote in message
ink.net...
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.

----------

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