[Elecraft] K2 phase noise

[S55M]

Hello boys!

I am playing around same problem for last two weeks.
I had written to reflector but no one was interested to comment.
I am using K2 for HF contesting with LL PA and for VHF contesting with
transverter+ LL PA and i also want to have signal clean as much as possible.
I was testing K2 on 14MHz with transverter and without it. For detailed
information (in numbers) i still need some peace of equipment (step att).I
was going from transverter output (abt 1mW sig) directly to a HF RX.Of
course, i was increasing noise all over the band but that was not the
problem.When i TX in SSB without modulation there are thousends of little
birdies (none on CW) all over the entire band, way down from the level of
carrier, but there. I am shure abt cause of that birdies is the 4MHz OSC on
KSB2 board.
What should be done in plus to take the TX noise further down?
Suggestions are wellcome.
Like Stewart, I would like to see the Top tehnicians to share the knowledge
with us on this reflector.


Have Fun!
S55M-Adi

----- Original Message ----- 
From: "Stewart Baker" <stewart at baker.nildram.co.uk>
To: "Fraser Robertson" <g4bjm at hotmail.com>; <elecraft at mailman.qth.net>
Sent: Friday, March 18, 2005 8:15 AM
Subject: Re: [Elecraft] K2 phase noise


It is my belief that a lot a technical aspects of Elecraft products are
being
discussed 'Off Reflector' between specific interested individuals.
I think that, because these discussions are not seen by the group, a lot of
useful information is being missed.

I would like to see these in-depth technical discussion treated in the same
manner as the "what soldering iron should I use ?" type threads.
Maybe the reflector could be sub-divided ?

END OF RANT ...

73
G3RXQ


 On Fri, 18 Mar 2005 01:26:19 +0000, Fraser Robertson wrote:
> 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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