Clearly you are not among those who reminisce
about the rotary spark gap, Alan :-)
73, Phil W7OX
On 7/27/15 1:53 PM, Alan wrote:
The need for linear amplifiers with CW has been
known for many years. Quoting from the 1964 ARRL
Handbook:
When key clicks introduced by the addition of
an amplifier stage
are found only near the transmitter
frequency, amplifier "clipping"
is indicated. It is quite common when fixed
bias is used on the
amplifier and the bias is well past the
"cut-off" value.
[In other words, a class C amplifier. Similar
to a bipolar transistor amplifier with no base
bias.]
A linear amplifier (Class AB1, AB2 or B) will
amplify the
excitation without adding any clicks, and if
clicks show up, a
low-frequency parasitic oscillation is
probably the reason.
Alan N1AL
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