The military Ka band is 20.2 to 21.2 on receive and 30 to 31 on transmit. Norsat of course has been making these for about 15 years, one of the first. Back when I was working on Milstar 25 years ago, with the same receive frequency, even the NF was classified. No, it does not make sense, but, that was the way it was. I just had to deal with some ITAR related issues, where, COTS equipment is being used, yet, it is now built for, or owned by the military, and, while the hardware is not classified, it is restricted, even as to who may work on it. I am just saying, do not hold your breath to see them coming on the military surplus market. Regards- Mike
Mike B. Feher, EOZ Inc. 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 office 908-901-9193 cell -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of jimlux Sent: Monday, November 15, 2010 10:16 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] ext ref LNB Re: ADEV 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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
