[R-390] More PTO pics

[Barry]

I put some more hi-res pictures on the website

www.knology.net/~thelanding

They are large (~1.5MB) files, though.

I'm curious about the "feedthrough" clamping device in PTO5.JPG.  Does
anyone know if unscrewing this will release the coaxial cable?  I want to
replace the cable, but I'm not sure how this "clamp" is disassembled.

I did a little testing on that capacitor lead tonight.  A very slight
pressure on it would cause it to fully touch the frame.  I could slide some
dental floss under it, but I could feel a slight pressure as it slid under
the wire so that gives you some indication of just how close it was to the
frame.

I moved the capacitor lead well away from the frame and tested the PTO.
After calibrating my 'scope (it was reading just a bit low), and measuring
the output with a scope probe (instead of with a direct connection with
RG-58 coax), I'm seeing 4.8V peak-to-peak now.  This is an improvement over
what I was seeing.  Part of this was due to my incorrect measurement
methods, part of it was calibration issues, and part of it may have been
that lead so close to the frame.  I'm thinking it wouldn't be worth it to
rebuild the thing at this point.  I might see 5 or 6 volts if I did, but I
might not and it's not worth risking those little irreplacable solder posts
to find out.  I *might* replace the 2.2k simply because they have a bad
reputation for going high (this one is a little high already) and I have a
2W replacement that would ensure good operation for a long time to come.

Anyways, thanks to all for "listening" to me.  It's been "fun", but I think
I'm going to move on to other parts of this restoration project.

Barry - N4BUQ