Not a professional here but I think it's a very interesting topic and
wonder if it applies to manual keys as well. A typical solution for
semi-automatic "bugs" (probably mis-adjusted) is to place a capacitor
across the terminals to alleviate "scratchiness".
I have an old Bunnell Double Speed "cootie" key that, if the contact
spacing is adjusted too wide, will produce erratic contact bounce keying
on the K3. I've never thought what effect a resistor across the
terminals might have.
FWIW, regarding wetting current-- we used to have DSL internet over
telephone lines at my house, which the provider was not interested in
maintaining, trying to push subscribers to fiber. The lines were allowed
to deteriorate badly for a couple of years before copper was finally
retired. During this time I solved the noise and low DSL speeds very
successfully by placing a suitable size resistor across the line-- the
constant current through oxidized connections & corroded terminals kept
the noise at bay. As I recall, a 15ma "sealing" current was enough to
keep it noise free but not enough to off-hook the line.
73,
Drew
AF2Z
On 10/15/20 02:23, dl2ki wrote:
Hi,
actually I expected a little discussion on a qualified professional level in
this mailing list. Otherwise I would not ask here. But the topic does not
seem to invite to it.
73, Wolfgang
DL2KI
--
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