[time-nuts] Meaning of "SS" on status screen from 58503A
Bob Camp
kb8tq at n1k.org
Sun Dec 14 19:52:24 UTC 2014
Hi
SS is signal strength. There is a setting somewhere buried deep in the SCPI to switch the display units.
Bob
> On Dec 14, 2014, at 2:40 PM, Dr. David Kirkby (Kirkby Microwave Ltd) <drkirkby at kirkbymicrowave.co.uk> wrote:
>
> Hi,
>
> I'm trying to make sense of the output from the status screen of this GPSDO
>
> E-113> :SYSTEM:STATUS?
> ------------------------------- Receiver Status -------------------------------
>
> SYNCHRONIZATION ............................................. [ Outputs Valid ]
> SmartClock Mode ___________________________ Reference Outputs _______________
>>> Locked to GPS TFOM 3 FFOM 0
> Recovery 1PPS TI +48.6 ns relative to GPS
> Holdover HOLD THR 1.000 us
> Power-up Holdover Uncertainty ____________
> Predict 8.5 us/initial 24 hrs
>
> ACQUISITION ................................................ [ GPS 1PPS Valid ]
> Tracking: 6 ____ Not Tracking: 1 ________ Time ____________________________
> PRN El Az SS PRN El Az UTC 19:12:37 14 Dec 2014
> 5 43 191 71 21 13 307 GPS 1PPS Synchronized to UTC
> 13 67 96 59 ANT DLY 0 ns
> 15 36 290 52 Position ________________________
> 26 81 307 50 MODE Hold
> 28 50 108 53
> 30 39 62 45 LAT N 51:39:04.122
> LON E 0:46:36.379
> ELEV MASK 10 deg HGT +44.16 m (MSL)
> HEALTH MONITOR ......................................................... [ OK ]
> Self Test: OK Int Pwr: OK Oven Pwr: OK OCXO: OK EFC: OK GPS Rcv: OK
> E-113>
>
>
> What does the "SS" mean? According to the 58503A / 59551A *Symmetricom* manual
>
> http://www.leapsecond.com/museum/hp59551a/097-59551-02-iss-1.pdf
>
> there should be a "C/N" there, not a "SS". The manual says 50 is the
> maximum value for C/N, and 35 is the minimum for stable tracking. The
> fact I have four satellites showing an SS of over 50 indicates that I
> can't just assume SS=C/N.
>
> The manual for the 58503B,
>
> http://www.leapsecond.com/museum/hp58503a/097-58503-13-iss-1.pdf
>
> which I assume is a later model than the 58503A, says again C/N is
> used on the 58503B, but it does say "SS" is used on the 59551A, which
> is a quite a different beast - it does not have a 10 MHz output. For
> that it says SS ranges from 0 to 255, and that 20-30 is weak. *IF* I
> can assume the SS in the 58503A works the same was as SS in the
> 59551A, then it looks like I have 6 satellites which are not weak. But
> that is a big "IF"
>
> Does anyone have an HP manual for the 58503A?
>
> 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)
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