My 58503A was showing an alarm when I came into the shack this morning. (I forgot to jot down the text on the display.) I cleared the alarm (Shift-Alt) and it otherwise seems 100% happy.
-ch 73 de AI6KG On Sun, Jan 1, 2017 at 7:02 AM, Dr. David Kirkby - Kirkby Microwave Ltd < [email protected]> wrote: > I put my HP 58503A into an infinite loop where > > 1) Forced GPS receiver to do a survey (GPS:POS:SURVEY ONCE) > 2) Waited until survey was complete (GPS:POS:HOLD? returns 1) This takes > about 2 hour. > 3) Recorded date (SYST:DATE?), time (SYST:TIME?) and location (GPS:POS?) > > For about 4 hours before the leap second, I stopped this, so the clock was > right at the time of the leap second. Then I restarted some time after > midnight. > > The actual data file is here > > http://www.kirkbymicrowave.co.uk/HP-58503A/gps.log > > which is being updated whenever a survey is complete, and new data > collected - about once every 2 hours. > > A plot of the height from the first 19 data points is here. > > http://www.kirkbymicrowave.co.uk/HP-58503A/gps-height.pdf > > Unlike hte log, this is not being updated dynamically - I should have used > another machine which has gnuplot on it for that. > > Anyway, based on the first 19 data points, the antenna height appears to > be anywhere from 40 to 48.5 m. I'm pretty sure it is not bouncing up and > down 8.5 metres! The latitude and longitude move too. I've not converted > them into metres, so I don't know how much they represent. > > The antenna is about 3.5 m above ground level, mounted to the side of a > garage, which is higher. I could push it another 2 m or so by mounting it > on the garage, but not without drilling holes in the garage which will not > exactly make the XYL happy, although I guess if I do it when she is not > looking, its a bit late to moan then! > > I was thinking of telling the receiver the location is an "average" of the > data points. Some thought would need to be given to averaging, although I > would have thought in my latitude (51 deg, 39' N), and distance from the > meridian (0 deg, 41' E), a simple mean would not be a bad figure. But I > stand to be corrected. > > -- > Dr. David Kirkby Ph.D CEng MIET > Kirkby Microwave Ltd > Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 > 6DT, UK. > Registered in England and Wales, company number 08914892. > http://www.kirkbymicrowave.co.uk/ > Tel: 07910 441670 / +44 7910 441670 (0900 to 2100 GMT only please) > > _______________________________________________ > 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.
