[Milsurplus] [ARC5] 1625 and Key Clicks.

[Hubert Miller]

From: milsurplus-bounces at mailman.qth.net [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Bob kb8tq
Sent: Tuesday, July 11, 2017 1:22 PM
To: arc5 at ix.netcom.com
Cc: arc5 at mailman.qth.n <arc5 at mailman.qth.net>; milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] [ARC5] 1625 and Key Clicks.

Hi

Time constant - how fast do you normally send?

10 WPM is 50 characters per minute or about one a second. With normal
spacing, you are at a character in a second.

If you send a series of numbers, you have about 20 elements per second. Normal
letters will be a bit less.

For reasonable “fidelity” you want a time constant / filter that will pass the 5th harmonic
of your keying “square wave”. That gets you to about 100 Hz or so.

This all scales with keying speed. If you normally send at 100 WPM, 100Hz becomes 1KHz.
None of it is exact. You could go to “3rd harmonic” and cut them 2:1. …You could go to the
9th harmonic and double the targets. It still works either way.

Bob

On Jul 11, 2017, at 12:26 PM, arc5 at ix.netcom.com<mailto:arc5 at ix.netcom.com> wrote:

Has anyone here figured the correct
R and C for a Key Click Filter at the
 keyed cathode of 1625s?
 If not, does anyone have a handle
on the correct Time Constant
to do a little wave shaping?

I could "by guess and by golly" with a 'scope, but surely someone has already
 done this.  ("And don't call me "Sherrly!")
Thanks,
Dave S.

Sent from my Ain't Smart Phone.

______________________________________________________________
ARC5 mailing list
Home: http://mailman.qth.net/mailman/listinfo/arc5
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:ARC5 at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20170711/0e76e8ba/attachment-0001.html>