On 18/11/2017 22:02, rickman wrote:
Roger Hayter wrote on 11/18/2017 4:04 PM:
Stephen Thomas Cole wrote:



Gents, can you please **** off.

If you have nothing to contribute to the discussion why join in at all?

My personal theory as to why few commercial morse keys use reed switches
or optical switches is that that users like to able to connect their
morse keys to a wide range of voltages and impedances, especially if you
include traditional valve equipment.Â*Â* Both technologies are intolerant
of excessive voltages or current compared with a pair of solid metal
contacts.Â* I don't think either speed, latency or debouncing are
significant factors or, at least, they could be designed out.

Not trying to be argumentative, but I'd like to understand the basis of
your point.Â* Why would the three things above not be factors in using
mechanical switches in keys?Â* Bouncing switch contacts do pose an issue
for clean keying of a transmitter, no?Â* So the bouncing has to be
smoothed out.


But you also need to remove the fast switching 'edges', the circuitry
which does this will also remove the 'bounce' effects found in a
mechanical switch.

From a practical view point, worrying about 'fast' switching at the
Morse Key seems rather nugatory when you need to ensure the transmitter
isn't actually 'keyed' so 'fast' that key clicks are generated (with
their attendant problems).


As to why Morse keys haven't been 'modernised' - perhaps it is as simple
as users like the traditional approach. I still prefer a mechanical
wrist watch.


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