[GreenKeys] Model 15 keyboard snubber?

[Harold Hallikainen]

As I continue to mess with the TU-170 (notes at
https://w6iwi.org/rtty/tu170/ ), I think that keyboard arcing is causing
trash in the AFSK output. When the loop is keyed by the keying transistor,
the AFSK output is clean. When keyed by the keyboard, there are some big
transients. I've temporarily connected an RC snubber consisting of a 470
nF capacitor in series with 100 ohms across the keyboard. The AFSK is now
clean! Is there a standard snubber for a model 15 keyboard?

Thanks!

Harold



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