[1000mp] Yaesu FT1000 Key Clicks

[Earl W Cunningham]

George, W5YR wrote:

"I plan to repeat the keying spectrum tests using a variety of rise/fall
times and receiving bandwidths and filter types in order to get some idea
of the role the receiver plays in the "other" op's perception of the
click situation. These findings will probably appear on Adam's website."
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Please let me know when thry appear there.

Bear in mind that (per W8WWV's o'scope plots) that when the 756Pro2's
menu rise time setting is:

2 msec, the actual rise time is 2 msec.
4 msec, the actual rise time is 3 msec.
6 msec, the actual rise time is 4 msec.
8 msec, the actual rise time is 5 msec.

Those values are from zero to peak amplitude, not from 10% to 90% as rise
time is usually defined, so reduce those values by 20% if you prefer that
convention.

When you do the tests, it would be a good idea to monitor the keyed
waveform to ensure that the actual rise times of the two radios are equal
in their comparisons, i.e., don't rely on the rise time menu settings of
each radio as being "honest" and equal to the other..
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"While the rise and fall times have an effect upon the keyed spectral
width and shape, I have found from examining the keying of various rigs
that the shape of the keyed envelope plays an important role as well."
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Particularly at the corners at the peak amplitude of the pulse, where the
power is greatest.

73, de Earl, K6SE