Hi > On Jul 2, 2015, at 12:19 AM, Mary Crowson <crowson....@sbcglobal.net> wrote: > > Hi. I'm pretty new to time nuts. I'm pretty much a novice, but a novice in > training. I subscribed to this group because I had reviewed pertinent > information that was being shared, and I appreciate the acceptance. I'm not > sure I can be of much immediate help to any others, but perhaps eventually. > Having said that, I come here, today, seeing some knowledge and advice.
Welcome !!! > I have a Lucent RFTGm-II-Rb/Lucent RFTGm-II-XO unit. I intend to convert the > 15MHz output to 10MHz for use as a GPSDO for an external standard for my test > equipment that I'm slowly acquiring and learning about, and learning about > and acquiring. I've seen the project where the 15 MHz was converted to 10 > MHz. Helpful. I have some questions about this specific unit, or set. They > are combined on a common rack that is much larger than my test equipment, > when coupled. There are some distribution hubs that are located on top of > each, respectively. Combiner/splitter. One is the 15 pin D-sub connector > type. The other is BNC. Does anybody have access to the operating manuals for > these, as well as the software, if one wishes to marry it to a PC and another > program? The Lucent boxes mostly speak SCPI. It’s more for monitoring them than operating them. If you dig into the archives, there are a couple of programs that are worth looking at as well as information on the (likely) command set / baud rates for use with a terminal program. > The next question is also GPSDO related. I have four of the 469357A GPS > antennas that were utilized with this equipment. According to some sources, > they have a gain of 20 dB. According to other sources, they have a gain of 30 > dB. According to some sources, the gain is somewhere in between. Does anybody > know for sure what the Nokia/Symmetricom ratings are, apart from their being > 5V? The antennas came from a half dozen sources. They have gains from about 22 db to 28 db depending on the source. Given that the tolerance on the gain is often +/- 3db, there may not be a lot of difference between the antennas. > Finally, for now, does anybody have any recommendations as to how I could, in > an affordable manner, without spending $350+ on a new GPS antenna combiner, > combine the signals for these four GPS antennas, to be utilized by the single > Lucent RFTGm-II-Rb/Lucent RFTGm-II-XO combined unit? You very much do not want to do that. GPS is a one antenna sort of thing. It depends on all the signals arriving at a single point in space. With multiple antennas, there would be no real way for the receiver to do it’s thing. You *can* run one antenna into multiple receivers. > As a measure to foil GOS spoofing, as well as giving a better chance of > locking into satellites quicker, as well as maintaining connection, with > multiple receivers located on each of four corners of a dwelling, since I > don't have the best unobstructed location for optimal satellite signal, due > to a canopy of trees, and other residential buildings with similar > landscaping? If you are in the US, what you want is the single location that gives you the best view due south. That’s the one most likely to give you a good population of sat’s in view. Bob > One more finally. This address says Mary. Long story. I'm Brian. I started > using this address long ago, and have remained in the habit of it. I've still > managed to remain in the habit of heterosexuality, despite. Just wanted to > let others know this is a guy and not some potentially unbelievably good > looking chick who is into ultimate geekery. > Any help would be appreciated. > > Brian > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
