What can you do with a phase locked oscillator like this ? How about a Doppler radar where you can hear people walking, machines operation, and balls rolling ? Go here to listen:
This is a procedure by which you can retune this MA-COM part to work at different frequencies. It was sent to me by the user on ebay=pyrojoseph. He sells alot of different RF/microwave parts at very reasonable prices on ebay.
Phase Locked Oscillator Re Tuning Method
First remove the doubler/mixer block from the main body. The 3 Philips screws are under the top label.
Sweep the filter
This step is optional but sure makes things easier.
Sweep the filter from the RF output connector for return loss from 11.5 to 13.5GHz.
You will see the current filter frequency indicated by a couple of negative pips.
Starting with the last filter adjustment screw (closest to the SMA connector) start adjusting inward to move the pips down toward 12Ghz until the last 5 screw adjustments bring the pattern centered on the 12GHz frequency on interest. Do not adjust the first filter screw next to the doubler diode at this time.
Now, install the filter block back on the PLO body centering the probe in the hole 180 degrees from the original mounting. This now gives you access to the filter screws while completing adjustments. I use a plastic clamp to hold it in position but a guess rubber band would also work.
Setting up the Phase Lock Loop
Power up of PLO and put 96MHz into the input @ 2-5dBm while monitoring the output frequency, output power and the DC voltage on the Phase output pin.
Adjust the cavity frequency screw using an insulated tool until you read 12.096GHz and then stop adjusting when the phase voltage nulls leaving this voltage at 4.0V.
You will find 3-4 other frequencies which will also null and phase lock.
Setting up output power
Now is the time to set for max power out.
During this part of the procedure be sure the phase lock voltage is has not gone above 4V and the frequency is still correct. Re-adjust the same 5 filter screws for peak power.
Next adjust the first filter screw next to the diode for peak power.
I believe this is a matching adjustment and has a lot of effect with very little movement.
You should now have 12.096GHz at about 12-14dBm power.
The 8.1 GHz bricks I sell on Ebay will adjust up to 10.4GHz with the same basic procedure with the additional requirement of changing the xtal frequency and trimming the filter posts of the last 4 filters .02-.025" using a file. | 
