I am left wondering if some K3 users who are seeing "Overshoot" are
actually seeing what is referred to as "Power Hunting".
That would occur mostly in Voice or DATA modes when the audio level is
not set high enough.
With insufficient audio, the K3 can initially go up to the set power,
and then will quickly settle back to a low power, and then gradually
climb to the full power set by the power knob - that behavior is seldom
seen in CW mode, but can be seen in DATA modes and Voice modes if the
audio levels are not set correctly.
The cure for that behavior is to drive the audio as indicated in the
manual. For voice modes, adjust the MIC Gain to produce 5 to 7 bars on
the ALC meter.
For DATA modes, adjust the audio levels to produce 4 bars solid with the
5th bar flashing.
If your data mode application has a "POWER" slider, it is not properly
named (complain to Joe Taylor) - it is just another audio level control.
The Elecraft transceivers control power differently than all other
amateur transceivers, so ignore the common internet advice to control
the power with the audio level. Set the audio as indicated in my
website article (same information is in the K3/K3S/KX3/KX2 manual) and
adjust the desired power with the POWER knob.
Other transceivers may be able to use the audio level to control the
output power, but Elecraft transceivers are different, do not "do it
that a-way".
Look at the article on my website www.w3fpr.com. Scroll down the left
column and click to open the document.
BTW: The originator of this thread is now on the right track, I have
exchanged several email messages with him (and I built his transverters).
73,
Don W3FPR
On 3/10/2019 3:02 PM, Jim Brown wrote:
On 3/10/2019 11:34 AM, John Simmons wrote:
Once I got my LP100, I began to see the same behavior with my K3. This
type of output anomaly is a huge reason to use ALC.
I've had an LP100 in line for several years, always set to read peak
power, and the most overshoot I've seen from either of my two K3s is
less than 1 dB. The K3s are driving a pair of 87As, and I have NEVER
used ALC between rig and amp.
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