> 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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