Jim and all,
I agree, the *best* way to look at keying is in the frequency domain,
but for those who do not have that capability, the time domain keying
waveshape can be beneficial.
The P3 TX MON option does not show the frequency domain, but it can
display the rise time and fall time of the CW keying envelope. Those
rise times and fall times (as well as the shape of the rise and fall
slope) are a good key to the cleanliness of the keying - the P3 TX MON
does provide that capability. Whether the viewer can interpret that
information clearly and correctly to determine good/bad keying is
another question. There is information available on the web showing
good and bad keying waveshapes. The figures in the Elecraft K2 Keying
Waveshape Mod instructions is one such document.
An additional monitor receiver with an IF tap and equipped with a P3
would be necessary to view the frequency domain of the CW signal.
Quite possible for those who have 2 K3s (or K3S) and at least one
equipped with a P3, but that is not the "average ham".
While the P3 does show the received signal in the frequency domain, that
is developed from the IF frequency of the receiver. The TX monitor sits
on the transmission line and must respond to the entire range of ham
band frequencies. To expect the TX Mon option to convert any transmit
frequency to a frequency domain display is just not reasonable given
today's technology.
73,
Don W3FPR
On 8/12/2015 6:20 PM, Jim Brown wrote:
Besides, the time domain (rise/fall times) is the wrong way to look at
keying. The only effective way is in the frequency domain, where the
P3 with SVGA can resolve to a few Hz when set for narrow scan widths.
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