[VoIP] VT1005 and rotary dials

[ikjtel]

--- Doug Alderdice <ka2wft at arrl.net> wrote:

> [snip] make/break ratio is a smidge out 
> on those dials.  I've also had dials that wouldn't
> work with the VT1005 one 
> day, and then be OK the next. 

I suspect this may be more a function of dial speed
than of percent break. 
 
All who can do so, please try the following test, and
report the results.  This would also have applied to
the TDM400 problems even though that's now a
known-fix.

After winding up the dial, DON'T remove your finger;
instead, apply pressure to the dial to make it return
faster than it normally would.  Likewise, add a little
"resistance" in your motion, so as to *slightly* slow
down the return of the dial.

This should work on all dials except certain Western
Electric dials (mostly W.E. No. 8 and 9 whose
bulletproof governors won't allow you to force it to
speed up by hand).  However the "slow" portion of the
test is the really pertinent part anyhow...

In the TDM400 bug, the code (32 msec.) was right near
the ragged edge of the std. dial spec (38 msec.), and
there was sufficient variability to make it fairly EZ
to trigger it.

If my hunch is correct, you should find that slowing
down the dial a wee bit will make it work every time,
whereas speeding it up should induce even "good" dials
to fail.....

-73

Max

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