N9DG:
>RE LO noise measurements - Note that the Sherwood
measurements are not very consistent for the spacing used to
measure the LO phase noise:
Orion (II) 10kHz
Corsair 4kHz
Omni VI+ 20kHz
Sharp eyes Duane! I agree but Corsair was
actually measured at 5 kHz, not 4. Corsair's
measurements were done long ago before Rob had
standardized on his current 10 kHz for phase
noise and 2 kHz for IMD. Also, Orion's phase
noise does not degrade appreciably at closer
spacings compared to Omni. (see figure 2-b on
page 5 below. I suspect Corsair also degrades
more at very close spacings than Omni but do
not have any measurements.
http://radio.tentec.com/cms-files/565_syn_article.pdf
The new phase noise plots by ARRL are much
better at showing phase noise over a wide range.
73, Bill W4ZV
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