[TenTec] Omni-VI+ Phase Noise and INRAD roofing filter mod?

[Bill Tippett <btippett@alum.mit.edu>]

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