[Elecraft] K3 and phase noise

[Ham]

Hi Eric

Do you have any transmitter IMD numbers yet?

Craig
VK3HE
--- "Eric Swartz - WA6HHQ, Elecraft"
<eric at elecraft.com> wrote:

> Hi Bill,
> 
> The reference on-channel signal for past ARRL BDR
> testing has typically 
> been set between -110 and -80 dBm, well above the
> MDS. te interfering 
> signal generator is increased until this signal
> drops by a dB due to 
> compression. This on frequency signal dominates the
> in-band RMS audio 
> voltage. The noise floor needs to raise a lot before
> it dominates that 
> signal.
> 
> Also, even on the Orion, their BDR is well above
> their phase noise at 
> any spacing.
> 
> For the Orion II, the ARRL numbers are:
> 
>                2kHz   20kHz
> Phase Noise    -129  -125
> BDR             136   136
> Neither of their BDRs were noise limited.
> 
> For the particular K3 I tested the phase noise on
> below, I measured a 
> typical BDR of 140-141dB at spacings 5 kHz and wider
> and about 138dB at 
> 2 kHz.
> 
> On another note, as I mentioned in my email, the
> ARRL has refined a 
> number of their test methods. They are now making
> the dynamic range 
> measurements by measuring the on frequency IMD spur
> or blocked signal 
> using a narrow band spectrum analyzer. This
> separates the blocking or 
> IMD measurement from  reciprocal mixing, which they
> will do as an 
> additional test. See page 71 of the May 2006 QST for
> details.
> 
> 73, Eric   WA6HHQ
> -----
> 
> Bill Tippett wrote:
> > WA6HHQ:
> >
> > Rig     1kHz    2   10   20   50   100   1M
> > K3      -110  -119 -136 -140 -143 -144  -150
> >
> >         I'm now wondering how you measured 143 dB
> BDR at 2 kHz in the 
> > presence of 119 dB Phase
> > Noise?  Shouldn't the measurement have been
> > "phase noise limited"?
> >
> >                                 73,  Bill  W4ZV
> >
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