[R-390] More PTO pics

[Cecil Acuff]

I'd agree with that....I see no flow at all...even can almost see through 
the loop on the left side of the pin....

Good catch....

Cecil...
----- Original Message ----- 
From: "KC8OPP Roger S." <kc8opp at yahoo.com>
To: "Barry" <n4buq at knology.net>
Cc: <R-390 at mailman.qth.net>
Sent: Thursday, May 18, 2006 5:32 AM
Subject: Re: [R-390] More PTO pics


> Barry,
>
> When I look at the pictures, especially PTO4 I wonder
> if tube pin #7 is a little shy on solder.
>
> Good Pics, hope you get this PTO working.
>
> 73's
> Roger
> KC8OPP
>
> --- Barry <n4buq at knology.net> wrote:
>
>> 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
>>
>>
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