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" <[EMAIL PROTECTED]> To: <elecraft@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. _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com