[Elecraft] Oddity in K3 with new synthesizer

[Guy Olinger K2AV]

The assumption would be that because it did not behave like your TS 480, it
was defective, the TS 480 being a superior benchmark? :>)

This was reported very early on with the new synthesizers and seems to have
no effect other than an emotional response in the observer. It is involved
with collection of design issues and solutions stirred up by the decision
to support very high speed QRQ QSK and the needed exceptionally short
RX/TX/TX transition times.

It also is a better method of regulation as the settling point is not off
to one side due to being "pulled" by some moving condition in the circuit
specifics until the detection threshold is reached. It is always being
tested for higher than and lower than. There is no detection threshold
bias.

Those who are into precise measurements can measure either side of this
very faint sawtooth and average them, knowing that both the high side and
low side limits have been tested by the +/- 0.07 Hz swing and the sweet
number is in the middle, without any state detection bias.

73, Guy K2AV

On Saturday, March 5, 2016, brian <alsopb at comcast.net> wrote:

> Guys,
>
> I wonder if anybody else noticed this.  I'm wondering if there is an
> explanation.
>
> Picked up a high S/N K3 which has new syntheizers installed.  It also has
> the TCXO installed.  No ref lock board.
>
> Looked at the pitch vs time from a Rb locked signal generator at 10 MHz.
>
> I see sawtooth variations in pitch of about 0.15 Hz peak-to-peak with
> periods of about 30-45 seconds.
>
> Anybody else notice this?
>
> These variations do not show up when the identical experiment is performed
> using a TS-480 with high stability oscillator.  Rather all variations are
> smooth.  They did not show up on an older K3 with the old synthesizer
> boards.
>
> Yes the variations are small but the discontinuous nature is of some
> concern.
>
> 73 de Brian/K3KO
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