Posted by
Eric Swartz - WA6HHQ on
Sep 21, 2007; 12:17am
URL: http://elecraft.85.s1.nabble.com/K3-and-phase-noise-tp453380p453381.html
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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