Jeff,
Some amps that have a mechanical relay for t/r switching can chop off
the first dit in semi- or full QSK, but usually not more than that. This
can cause hot-switching of the relay, which can damage the relay or
other parts. In this case it's possible to use some kind of sequencing
circuit, which prevents damage but still chops the first dit. Some amps,
like Ten-Tecs, have the sequencing built in.
Some Elecraft K3s seem to come up slowly because of the closed-loop
power control system. I think the power calibration routine fixes this.
But this phenomenon is slower, more like you describe, with the power
coming up over the first few letters. Elecraft K2s all do this, but
there aren't so many of them around, especially combined with high power
amps.
Maybe there are other transceivers with similar systems, but I am not
aware of any.
73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
On 26/06/2019 19:41, Jeff in Mali: via Amps wrote:
I have been noticing in my pileups that I have a hard time copying
the first couple of letters of people call signs in pileups on CW..
After listening more carefully, what I seen to find is that the
strength of the signal as the amps fire up on CW is up to 2 S-units
lower than when it gets to full power. Is this the case that amps
take a few milliseconds to come up to full power? And therefore it
may be putting out less than full power on the first few letters of a
call sign than on latter letters? 73, Jeff TZ4AM
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