Mike Feher wrote:
Well, that I do not know. The majority of Ku & Ka LNBs for home TV use are
using free running DRO's. I have a bunch of them, and never ran across any
locked ones, except for some of the ones used for internet service. My real
experience is what we use in military satcom terminals at Ku and Ka bands,
with apertures from 0.6 to 9.2 meters, and they are all locked to an
external 10 MHz reference. I doubt if you will see any major dumping of
those. Especially now, because of strict ITAR. Even if one can buy it
directly from the manufacturer, once the military has owned it, they will
probably dispose of it in such a way that we will not see them on ebay.
Regards - Mike
I doubt the LNB is export controlled.. It's unlikely to have an
exotically low noise temperature, they're not cryogenic, they don't use
components with dual-use, it's just part of a receiver. If you go to
the NORSAT website, for instance, they don't make much mention of export
controls (yeah, I'm sure the invoice/quote would have export
boilerplate on it "the contents of this have not been reviewed... use,
sale, distribution may require license...")
http://www.norsat.com/lnb/blog
And I note that the datasheet's pretty sketchy on the external reference
LNBs.. They give phase noise as follows (for Ku band, 10.75 GHz LO):
-75dBc/Hz @ 1kHz
-85 @ 10k
-95 @ 100k
But they don't say whether that's added to the reference noise, or
that's the "outside the loop" noise, or what..
What's interesting is that the Ka-band LNB (for 18-19 GHz, which is low
Ka, to my thinking.. I think 30 when I think Ka).. the noise is actually
lower
-65 @ 1k
-75 @ 10k
-95 @ 100k
-100 @ 1M
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