A bit OT: Those Odetics I have quite a few of the antennas were mount on radio towers, on mountain tops, we ended up putting heaters on a few of them when one was found 'inside' a few inches of ice one winter.
On Mon, Feb 28, 2011 at 10:01 AM, Bob Camp <[email protected]> wrote: > Hi > > One long term issue with the skylight: > > Stuff (snow, rain, birds, space aliens) can pile up on the skylight. That > messes with the GPS signal. You really want to get the antennas outdoors if > at all possible. > > When you do get them outdoors, don't forget that the electric code (and > common sense) requires that you put a proper ground and lightning arrestor > on them. > > Bob > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of David VanHorn > Sent: Monday, February 28, 2011 12:45 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Newby with questions > > > The 24 GPS satellites are in orbits that never pass over the poles. > I think they are about 60 degree inclinations. By your description > you must be in the northern hemisphere. If you can, set up your > antenna so it can see to the south and don't worry if the view of the > north is blocked because as you found there is nothing to see there. > > > I see! So I could move the antennas closer to the north side of the > skylight, letting the skylight wall on the north side get up around 60 > degrees, so that my view to the south is more optimized. > > I also see the notes on the temp sensor, just ordered some rev C parts that > I can change out here as needed. > > > I'm going up on the forklift today to connect the second feed (didn't have > enough adaptors Friday for N-F) and I'll nudge the positioning a bit, then I > can do the survey on the other antenna. > > > I understand that the Tbolt should be giving me WAY better than 1PPM, but > that's exactly what I wanted. Until I started pushing this issue, we didn't > calibrate anything, and our test gear was in constant disagreement. If you > can't measure it, you can't improve it, and I'm tired of measuring with > unmarked string.. <VBG> > > My next problem to solve, is distributing the signal through the production > floor. I won't need phase accuracy between the drops, but I don't want to > induce any significant error. My initial thought was simply to amplify and > split like CATV drops, but I'm seeing that this may not be the best > approach. I have a 75 ohm video distribution amp on order that will serve > my immediate needs, maybe something better later on. > > Question: Is there a way to have the Tbolt shut off the 10 MHz output if it > is not reliable? I'd rather have no signal than an unreliable signal. > > > > _______________________________________________ > 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. > _______________________________________________ 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.
