[Elecraft] Sigmoidal keying mod, whoop solved

[Indy]

The solution to the "whoop" for my radio, serial # 700, was simple, and =
thanks to Gary (as usual).

The construction manual at that time says, "Set the VCO voltage as high =
as possible as long as no reading is over 7.5 volts."  I managed to =
obtain 7.4 volts at 4.0 mhz, the rest follows.  I had 6.25 volts on 7.3 =
mhz.

Gary advised setting the VCO voltage on 4.000 mhz to 6.0 volts which i =
did.  That led to the voltage on 7.300 being 4.9 volts.  He said that =
above 5.5 volts it seemed that the voltage did not have time to drop to =
zero before keying began, hence the brief frequency change.  The whoop =
had nothing to do with the keying mod itself.  I bet the field testers =
all had lower VCO adjustments to begin with.

Since this adjustment, all reports have been something like this one; =
"your keying is perfect."  That IS what I was looking for.  I may be a =
lid, but I can at least sound good ;-)

Lowering this voltage setting significantly reduced clackity sounds =
associated with the sidetone in QSK.  In my radio, those sounds are =
pin-prick short.  Wish I could get rid of even that.

As always, thank you for the support of the list!!!

73,

Fred
KT5X
W5YA/qrp

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