Wiltron / Anritsu switched frequency doubler module

[Aiy]

Hello Everyone,
I recently got an Anritsu 69167B 10MHz - 40GHz synthesizer.
The unit has a faulty Switched Doubler Module, so almost no output from the synthesizer in the 20-40 GHz range.
I have checked the VNA we have at work and found that the 40GHz wiltron VNAs in the 37xxx series are a potential source for an equivalent device.

So, I was wondering in anybody has a d28540 SDM module, or a broken Wiltron / Anritsu 37xxx 40GHz VNA that could be sourced for a spare part?

I also took some pictures while I was checking over the SDM.
On the RF side (picture 1) we have a number of PIN diode switches that enable / disable the path from the 0-20GHz straight path. Along the "straight" path we also have a number of PIN diode switched "stubs" that are used to provide extra filtering of the output signal.
The secondary path out makes a side-trip to the right, through an amplifier, is split and passed into two parallel amplifiers, re-combined and dives down into a PCB VIA

On the bias PCB side (picture 2) there is routing from the 15-pin low-density D-SUB to the various feed-through filter positions and a couple of resistors and caps, nothing exotic.

Below the bias PCB is a small covering hatch which covers the frequency doubling circuit (picture 3). The via from picture 1 comes in at the top of the picture, is then fed to two diode pairs in a single beam-lead construction (zoomed for glory in picture 4). The diodes in my unit are broken and shorted. As far as I have been able to gather, this is a custom Wiltron/Anritsu part that I cannot find.

Best regards

[Joel_Dunsmore]

If you happen to attend the ARFTG / RWW conference starting next week, you'll likely find Jon Martens there, and I guess he might have either designed the part or knows a lot about it. 

www.arftg.org or www.radiowirelessweek.org