[Elecraft] sigmoidal keying mod

[Mike Harris]

G'day,

: it has turned out to be caused by the VCO voltage.  The manual says,
"The
: higher all the VCO voltages the better, as long as they don't exceed 7.5
: volts."
:
: That is not true.  Gary says if the VCO voltage at 7.300 is above 5.5
volts,
: it can not fall fast enough for this new keying and a short chirp on 40
: meters is the result.  Mine was 6.25 volts.  He recommended I adjust
4.000
: mhz VCO voltage to 6.0 volts which I did.  That led to a 7.300 voltage
of
: 4.96 volts.
:
: with this adjustment the very short whoop is gone.  Also, much of the
: clackity sounds with the sidetone have disappeared.

Very interesting.  I smell a builder alert.

Regards,

Mike VP8NO
#1400