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reverse keyed CW paddle

 

I'm looking for a paddle key that has a set of break contacts for an experiment, towards this effort I am in need of a key that has or can be readily converted to implement a set of break circuit contacts. this is so that an established current flow can be interrupted to signal the respective dits or dashes.? this experiment seeks to find if such a method is more reliable then the established practice of using normally open contacts on our CW keys/bugs, and paddles.

Justin N2TOH
 

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Wow, interesting thought. My experience has been the only unreliable aspect of CM/Morse (other than the Op) was the contacts themselves. I mostly have used a straight key, and I find the contacts get dirty and so make intermittent, bouncy contact. That would likely be just as much a problem on the system you are considering, NC with open to send. I am curious what you have found that needs to be improved. Keep us informed.

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VY 73,

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Wes

Hereford, AZ

AE6ZM & VE7ELE

GROL / Radar

ARRL Technical Specialist

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Wes

AE6ZM

Hereford, AZ

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Hi Justin & All
You are after two related features: Keying reversal and keying reliability
If it were just the reversal I would use two outboard transistors to invert
the dit and dah signals.
However to get rid of contact bounce I would try an 8-pin micro like a
PIC or AVR (ATtiny13A) which can be made to debounce the contacts
and allow a switch selection of the close versus open sense.
Now Hans may have the debouncing in operation in the QCX already
but I have not read the bible on it in that detail. Others' comments?
Cheers - - John, VK6JY



On 10/10/2017 11:09 AM, freefuel@... wrote:
I'm looking for a paddle key that has a set of break contacts for an experiment, towards this effort I am in need of a key that has or can be readily converted to implement a set of break circuit contacts. this is so that an established current flow can be interrupted to signal the respective dits or dashes.? this experiment seeks to find if such a method is more reliable then the established practice of using normally open contacts on our CW keys/bugs, and paddles.

Justin N2TOH


Virus-free.

 

Wes, I'm looking at it from the overall duty cycle point of view, the paddle spends most of it's time with the keys not pressed. that state of non use permits a really LONG time to debounce the off state, while opening the NC contact to key it gives you a very obvious change of state.?

-Justin N2TOH
 

Hi John
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Now Hans may have the debouncing in operation in the QCX already
but I have not read the bible on it in that detail. Others' comments?

FYI: in the QCX kit, all the switch and button inputs are debounced in the firmware.?

73 Hans G0UPL
 

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Seems like a good idea. I failed to consider the ‘new’ hardware that acts so quickly, such as uP inputs. My old tube transmitters only see me as a problem!! I am going to think about your idea some more. Neat stuff, all this.

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VY 73,

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Wes

Hereford, AZ

AE6ZM & VE7ELE

GROL / Radar

ARRL Technical Specialist

?


--
Wes

AE6ZM

Hereford, AZ

?
 

I'm looking at it from the overall duty cycle point of view, the paddle spends most of it's time with the keys not pressed. that state of non use permits a really LONG time to debounce the off state, while opening the NC contact to key it gives you a very obvious change of state.

Just use an optical detector. The key lever moves a small light shutter blade between a LED and a photodiode. A Schmitt trigger will give you a clean keying signal. That way there are no contacts to adjust or corrode. Keying rise and fall times can be controlled in the logic circuitry supporting the Schmitt trigger circuit.

Best DX & 73,

Ralph W5JGV - WD2XSH/7
 

Ralph,

I have considered optical switches, a large part of it is the curiosity of wanting too see what it will do with the NC contacts.

-Justin
 

More food for thought...

Key...clicks, shaping, RF Envelope;

page 130, RF Envelope Key Shaping
page 119, TX/RX Switch control, and Key Out signals
page 114, #5.12 Key-shaping circuit

From Hans'? ...OUTSTANDING...

?QCX: 5W CW Transceiver kit assembly instructions...
??? https://www.qrp-labs.com/images/qcx/assembly_LT.pdf
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John
N3AAZ?
 

yes in reference to the envelope shaping I'm interested what might be applicable to tube amps if your willing to mix semiconductors with valves.

-Justin N2TOH
 

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You’re on an interesting quest Justin.

I can’t help with any paddle hardware but on reading your message I immediately thought of the “Solid State CW Paddle” from Neno, 9A5N.
Maybe this could help in your project.

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Peter – LB0K

Sotra

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