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Info needed on Spectracom 8171A clock... Help

D

Dennis

Jan 1, 1970
0
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I have a Spectracom 8171A WWVB Synchronized clock.
Need a manual on this clock, or some good operating
information. Much appreciated.

TIA,

Dennis
 
T

Tim Shoppa

Jan 1, 1970
0
Dennis said:
--

I have a Spectracom 8171A WWVB Synchronized clock.
Need a manual on this clock, or some good operating
information. Much appreciated.

I believe that it uses the same protocols as the Spectracom
8170, which is well documented in many places including the NTP
source code. From refclock_wwvb.c:

* This driver supports the Spectracom Model 8170 and Netclock/2 WWVB
* Synchronized Clocks and the Netclock/GPS Master Clock. Both the WWVB
* and GPS clocks have proven reliable sources of time; however, the
* WWVB clocks have proven vulnerable to high ambient conductive RF
* interference. The claimed accuracy of the WWVB clocks is 100 us
* relative to the broadcast signal, while the claimed accuracy of the
* GPS clock is 50 ns; however, in most cases the actual accuracy is
* limited by the resolution of the timecode and the latencies of the
* serial interface and operating system.
*
* The WWVB and GPS clocks should be configured for 24-hour display,
* AUTO DST off, time zone 0 (UTC), data format 0 or 2 (see below) and
* baud rate 9600. If the clock is to used as the source for the IRIG
* Audio Decoder (refclock_irig.c in this distribution), it should be
* configured for AM IRIG output and IRIG format 1 (IRIG B with
* signature control). The GPS clock can be configured either to respond
* to a 'T' poll character or left running continuously.
*
* There are two timecode formats used by these clocks. Format 0, which
* is available with both the Netclock/2 and 8170, and format 2, which
* is available only with the Netclock/2, specially modified 8170 and
* GPS.
*
* Format 0 (22 ASCII printing characters):
*
* <cr><lf>i ddd hh:mm:ss TZ=zz<cr><lf>
*
* on-time = first <cr>
* hh:mm:ss = hours, minutes, seconds
* i = synchronization flag (' ' = in synch, '?' = out of synch)
*
* The alarm condition is indicated by other than ' ' at a, which occurs
* during initial synchronization and when received signal is lost for
* about ten hours.
*
* Format 2 (24 ASCII printing characters):
*
* <cr><lf>iqyy ddd hh:mm:ss.fff ld
*
* on-time = <cr>
* i = synchronization flag (' ' = in synch, '?' = out of synch)
* q = quality indicator (' ' = locked, 'A'...'D' = unlocked)
* yy = year (as broadcast)
* ddd = day of year
* hh:mm:ss.fff = hours, minutes, seconds, milliseconds
*
* The alarm condition is indicated by other than ' ' at a, which occurs
* during initial synchronization and when received signal is lost for
* about ten hours. The unlock condition is indicated by other than ' '
* at q.
*
* The q is normally ' ' when the time error is less than 1 ms and a
* character in the set 'A'...'D' when the time error is less than 10,
* 100, 500 and greater than 500 ms respectively. The l is normally ' ',
* but is set to 'L' early in the month of an upcoming UTC leap second
* and reset to ' ' on the first day of the following month. The d is
* set to 'S' for standard time 'I' on the day preceding a switch to
* daylight time, 'D' for daylight time and 'O' on the day preceding a
* switch to standard time. The start bit of the first <cr> is
* synchronized to the indicated time as returned.

Tim.
 
D

Dennis

Jan 1, 1970
0
Dennis <Dennis_The_Menace@no_spam.net> wrote in message

I believe that it uses the same protocols as the Spectracom
8170, which is well documented in many places including the NTP
source code. From refclock_wwvb.c:

* This driver supports the Spectracom Model 8170 and Netclock/2 WWVB
* Synchronized Clocks and the Netclock/GPS Master Clock. Both the WWVB
* and GPS clocks have proven reliable sources of time; however, the
* WWVB clocks have proven vulnerable to high ambient conductive RF
* interference. The claimed accuracy of the WWVB clocks is 100 us
* relative to the broadcast signal, while the claimed accuracy of the
* GPS clock is 50 ns; however, in most cases the actual accuracy is
* limited by the resolution of the timecode and the latencies of the
* serial interface and operating system.
*
* The WWVB and GPS clocks should be configured for 24-hour display,
* AUTO DST off, time zone 0 (UTC), data format 0 or 2 (see below) and
* baud rate 9600. If the clock is to used as the source for the IRIG
* Audio Decoder (refclock_irig.c in this distribution), it should be
* configured for AM IRIG output and IRIG format 1 (IRIG B with
* signature control). The GPS clock can be configured either to respond
* to a 'T' poll character or left running continuously.
*
* There are two timecode formats used by these clocks. Format 0, which
* is available with both the Netclock/2 and 8170, and format 2, which
* is available only with the Netclock/2, specially modified 8170 and
* GPS.
*
* Format 0 (22 ASCII printing characters):
*
* <cr><lf>i ddd hh:mm:ss TZ=zz<cr><lf>
*
* on-time = first <cr>
* hh:mm:ss = hours, minutes, seconds
* i = synchronization flag (' ' = in synch, '?' = out of synch)
*
* The alarm condition is indicated by other than ' ' at a, which occurs
* during initial synchronization and when received signal is lost for
* about ten hours.
*
* Format 2 (24 ASCII printing characters):
*
* <cr><lf>iqyy ddd hh:mm:ss.fff ld
*
* on-time = <cr>
* i = synchronization flag (' ' = in synch, '?' = out of synch)
* q = quality indicator (' ' = locked, 'A'...'D' = unlocked)
* yy = year (as broadcast)
* ddd = day of year
* hh:mm:ss.fff = hours, minutes, seconds, milliseconds
*
* The alarm condition is indicated by other than ' ' at a, which occurs
* during initial synchronization and when received signal is lost for
* about ten hours. The unlock condition is indicated by other than ' '
* at q.
*
* The q is normally ' ' when the time error is less than 1 ms and a
* character in the set 'A'...'D' when the time error is less than 10,
* 100, 500 and greater than 500 ms respectively. The l is normally ' ',
* but is set to 'L' early in the month of an upcoming UTC leap second
* and reset to ' ' on the first day of the following month. The d is
* set to 'S' for standard time 'I' on the day preceding a switch to
* daylight time, 'D' for daylight time and 'O' on the day preceding a
* switch to standard time. The start bit of the first <cr> is
* synchronized to the indicated time as returned.

Tim.

Tim,

thank you for your response. This clock does not receieve the WWVB signal
directly, instead it is inputed via a WWVB receiver. The receiver that
can be used are the 8160,8161, 8164, and 8165. At this point I guess I need
one of those receivers.

Dennis

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