typo:  "60 ma"

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On Aug 5, 2023, at 10:07 PM, Gerry Block <gblock@sbcglobal.net> wrote:

eric

what does your loop schematic look like?  sketch it out and enclose photo. 

what is the loop power supply voltage. 

what is the series resistance to make the 60ms. 

are you sure it is running at 60 ms?

where is the scope probe grounded and where is the loop supply grounded?

i doubt it is the contacts.  

gerry

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On Aug 5, 2023, at 5:49 PM, Eric Moore <mooreericnyc@gmail.com> wrote:



I have cleaned with contact cleaner and paper tape pretty extensively, but can always go another round.

I do not think that is a good waveform, but similarly, no idea.

-Eric

On Sat, Aug 5, 2023, 7:23 PM Jeffrey Golas <jeffg@junknet.net> wrote:

Correct me if Im wrong but could just be "dirty"; as the cam rubs against the switch youre seeing noise like a dirty volume pot.

Id use some alcohol and a business card and scrub the contacts (plus Im not sure thats even a terrible signal for a 1940s device. Going machine to machine I dont think that tiny bit of leakage woulda mattered.

Again, correct if wrong, Im here learning too.

Jeff KC3GJX

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