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Author Topic: Shape of contacts on a keyer  (Read 348 times)
K8TJM
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Posts: 11




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« on: February 05, 2008, 01:00:37 PM »

Hello all:

Ideally, should the shape of the contacts, on a keyer, be flat so the whole surface is in contact or a little convex?

tia.

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WB2WIK
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Posts: 20542




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« Reply #1 on: February 05, 2008, 01:28:38 PM »

Flat.

But keyer paddle contacts normally carry "no current" at all (microamps) so having a good, solid, low-resistance contact doesn't matter; all that matters is repeatability, and having mating flat contacts helps assure that.  If they're not quite flat but slightly bowed or curved it really doesn't matter with a keyer paddle.

Because paddles carry no current and do not "wipe" themselves clean at all, it pays to clean them every now and then -- very gently.  I just use a dollar bill swiped between the contacts about once every six months or so, keeps them very clean.

WB2WIK/6
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W8JI
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« Reply #2 on: February 09, 2008, 05:00:26 AM »

I'm confused. A keyer is the thing that makes the dots and dashes. Like my Yaesu has a built in keyer, and I have a few MFJ keyers.

Or did you mean the key or paddles?? The paddles or key has contacts.

If you are talking about the key the contacts shouldn't carry much current. They should have very slightly convex contact surfaces although that isn't totally necessary. The most important thing is the materials, not the shape as long as they aren't too wide or too narrow.

If you are actually asking about the keyer and not the key I'm not sure what you mean.

73 Tom



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