Thank you for the responses and I'm pleased to get some discussion going on
this subject on the reflector. Phase noise has been brought up before, but
not discussed in detail. As I said I've had personal emails about this so I
know I'm not on my own here.
I should point out that my comments were not intended to 'slag off' the K2,
and I am not 'obsessed by numbers'. I don't expect the K2 to have lab grade
performance, nor to outperform high price rigs. My sole reason for looking
into this (believe me I've got better things to do) is due to complaints
about my signal on air. These have been from respected and technically
competent amateurs. I can go into detail if required.
Several months ago I had some exchanges with Gary and Eric, and sent them
some analyser plots. More recently I've done comparisons at 300Hz from
carrier using a HP8640B as a reference, and I soon should be in a position
to produce more detailed plots of the close in phase noise.
Although the comparisons I've made clearly show the K2 is inferior to the
MP, 870 and a home brew rig in this respect as stated, the phase noise
performance to me seems adequate, however, that doesn't explain the comments
I've received on air. I get very similar results with two K2's, one built
by me and another by GU3MBS, who is a very experienced K2 builder. Both
have all the latest mods. At other times I've received good reports,
possibly from less critical operators? 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.
By the way I've moved the K2 as far as practical from hum sources (>2') and
even tried enclosing it in a mu-metal shield, so I'm pretty confident that
magnetic modulation isn't the culprit.
73 Fraser G4BJM
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