[time-nuts] VHF-UHF Frequency Calibrator

[Brooke Clarke]

Hi Ed:

I checked optically, using an Ohmmeter and using the Diode Test function of a Fluke 87 DMM.  It's an inductor.

I share your concern as to how 11 GHz signals come from tube equipment with point to point wiring.

-- 
Have Fun,

Brooke Clarke
https://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

-------- Original Message --------
> That's an interesting unit. You may want to take a close look at the small axial-leaded component going from the tube 
> socket pin 7, to the B+ feed-through cap adjacent the "C18" label on the chassis. It appears you have it as a choke in 
> the schematic, but I believe it's a diode - specifically, a step-recovery one. Our old friend the SRD shows up in a 
> lot of places. You can at least check to see if it's a diode, and intact.
>
> That would also explain how a "regular" pinned tube and socket combo can provide any meaningful power output to 11 
> GHz. If it was an acorn or lighthouse tube or something like that, I could picture it, but I'd say the tube is just 
> pumping the 50 or 100 MHz into the SRD, which is doing the multiplying. The RF current path would be through the SRD, 
> the feed-through cap into the chassis, then to the output tank, then back to the socket pin via the stout cap, which 
> looks like a solder-in type feed-through rigged for coupling - almost as good as a leadless cap.
>
> Whatever you do, be careful while poking around in there. With the diode hanging off B+, a simple shorting mistake 
> could take it out.
>
> Good luck.
>
> Ed
>
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