[Elecraft] K2 phase noise

[Geoffrey Mackenzie-Kennedy]

Morning Fraser,

Your comments understood, and I agree with you about the design / production
engineering.

There is the possibility that a Rx /Tx switch in the signal path and using
diodes, is acting as a noise generator. The noise could be driving the QRO
stage as an independent source, or could be modulating the drive signal.
These otherwise excellent switches can generate noise, but usually very
little unless something goes 'ga ga'. Going from QRP to QRO could make such
noise 'a problem' especially if something is amiss ('ga ga'). Spectral
analysis should offer clues.

This thought is based on a design problem with a 50kW ISB rig in which diode
switching was used in QRP stages to interchange sidebands.

73,
Geoff.
GM4ESD


----- Original Message -----
From: "Fraser Robertson" <g4bjm at hotmail.com>
To: <elecraft at mailman.qth.net>
Sent: Friday, March 18, 2005 1:26 AM
Subject: [Elecraft] K2 phase noise

> I want to get to the bottom of this
> so that I can confidently use my K2 for QRO contesting.  The rig has many
> fine attributes and I take my hat off to Wayne and Eric for their
excellent
> design and production engineering.