[Elecraft] How to measure keyed waveform

[Don Wilhelm]

Larry,
I would use a (properly compensated) 10x 'scope probe connected across my
dummy load rather than connecting coax to the scope.  The dummy load
presents a proper load to the transmitter and the low capacity probe does
not upset that relationship.

You could trigger the 'scope from the negative-going edge of the keying line
(just connect from the dot side of the paddle if you are using the dot
paddle to produce a reoccuring sequence) so you can stretch out the time
base to view the beginning of the RF output easily, or you could simply
trigger the 'scope from the input RF waveform.  If you chose the latter, you
may have to set the time base to view 2 RF 'bursts' in order to examine the
first part of the waveforms rising edge.  Some 'scopes trigger from the
vertical inputs better than others, and you did not say what kind of 'scope
you are using.

73,
Don W3FPR

----- Original Message -----

>
> What is the proper way to look at one's keyed waveform on a scope?
>  I was thinking of using a BNC T connector, with one end on the Ant.
> terminal of the K2, dummy load to the other end and the tap would go the
the
> scope. Should I connect it directly to the scope with a short length of
coax
> or use the scope probe. (which is compensated for a nice square wave.)?
> What is the correct way to trigger the scope. Should it be tied to the
> Keying line or let the scope autotrigger on the rigs output? If you should
> use the key line, what is the easiest way to do it if the rig has a built
in
> keyer?
>
>