MANU: TRUETIME Symmetricom
MODEL: XL-DC
Symmetricom GPS Time Frequency Receiver
Nameplate info: "SYMMETRICOM TIME TESTING AND MEASURE
DIVISION MODEL NO.: 151308129 SN: SR035043635"
TrueTime/Symmetricom XL-DC TCXO GPS time receiver/precision
oscillator. It has a backlight which is an option on the XL-DC. A professional grade outdoor antenna with a full view
of the sky will be needed for the item to perform to full
specification.
I'm backing it up. 30 days full refund in the connected USA states.
IT BOOTS UP CLEANLY TO OPERATING MODE
COSMETIC CONDITION: ON A SCALE OF POOR/FAIR/GOOD/EXCELLENT IT'S IN THE GOOD CATEGORY.
SEE THE PHOTOS. THERE IS SOME STICKER ADHESIVE ON THE TOP AND SOME SCRATCHES ON THE TOP
BACKGROUND INFO FROM THE MANUFACTURER
Model XL-DC
High-Precision GPS Synchronized
Time and Frequency Receiver
Less than 40 nanoseconds rms accuracy to UTC
during Selective Availability (SA)*
•
Better than 1x10
-12
frequency accuracy
•
Versatile and modular architecture
•
Supports many different output options
•
1 PPS output
•
IRIG-B time code output
•
Internet/local network remote control option
The ultra precise XL-DC provides the highest degree of
time and frequency accuracy available in a GPS timing
receiver. Standard outputs include a 1 PPS, analog IRIG-B
time code and serial I/O time strings. A major advantage
of the XL-DC is its versatile and modular architecture. A
wide range of time and frequency plug-in options allow
the XL-DC to be customized for specific applications and
easily upgraded at a later time.
TrueTime’s proprietary multi-satellite ensembling tech-
niques provides very stable and precise timing outputs.
Timing accuracy is less than 40 nanoseconds rms to UTC
even during Selective Availability (SA). This superior oscil-
lator disciplining to GPS enables internal oscillator accu-
racy to better than 1x10
-12
. For applications requiring
increased oscillator stability during GPS outages, the
XL-DC can be upgraded to include ovenized quartz or
rubidium oscillators.
The very modular backplane architecture supports multi-
ple time and frequency output options to address specific
needs. The standard model supports up to four single-
height plug-in modules. Using the optional 3.5" high
chassis, the XL-DC can accommodate up to ten single-
height modules. These modules can be incorporated at
any time and significantly increase the adaptability of the
XL-DC to changing requirements.
The option modules are a cost-effective way to create a
very versatile clock to support different applications
beyond those supported by the standard outputs. For
example, adding the Network Time Server and Tele-
communications modules allow the XL-DC to synchronize
computer clocks across an Ethernet network as well as
routers, multiplexers, switches and other telecommunica-
tions equipment that use T1 signals. Option modules can
also increase signal distribution. Additional sinewave or
time code modules can eliminate the need for other signal
distribution chassis. The wide range of options lends itself
well to configuring the XL-DC as the central time and fre-
quency source for many applications commonly found in
the laboratory, range, and enterprise environments. See
the Options section for a complete list of options.
Specifications: XL-DC
Receiver/General
Timing Accuracy UTC/USNO:
<40 ns rms (150 ns peak) with
Selective Availability (SA) and tracking 8 satellites.*
Receiver Input:
1575 MHz L1 C/A code.
Tracking:
Eight parallel channels. Multi-satellite ensembling
with system integrity monitoring.
Position Accuracy:
Latitude, longitude, and altitude within
10 meters, referenced to WGS84, after completing of
24-hour initialization position averaging.
Acquisition Time:
Warm start (has ephemeris data and posi-
tion) typically <2 minutes. Cold start typically less than
20 minutes.
Internal Oscillator:
Accuracy:
<1x10
-12
when tracking satellites.
Stability:
1x10
-9
at 1 second.
3x10
-10
at 100 seconds.
1x10
-12
at one day.
Stability when Not Tracking Satellites:
2x10
-6
over 0°C to
+50°C
Antenna:
L1, GPS, 40 dB. RG-59/U cable, 50' (15 m) sup-
plied; maximum cable length 150' (46 m). For longer cable
runs, see Options.
Timing Outputs
1 PPS Output:
TTL into 50 ohms, rising edge on time.
20-microsecond pulse width. Rear panel BNC.
IRIG-B Output:
1 kHz amplitude modulated carrier. 3 Vpp
high, into 600 ohms. Rear panel BNC. DC level shift format
optionally available.
Serial I/O:
Bidirectional port at RS-232 levels.
Mechanical/Environmental
Receiver:
Power:
95-260 Vac, 47 to 440 Hz, <15 watts.
Size:
1.75" x 17" x 10.38" (4.4 cm x 43.2 cm x 36.4 cm).
Operating Temperature:
0°C to +50°C.
Storage Temperature:
-40°C to +85°C.
Humidity:
To 95% noncondensing.
Antenna:
Size:
3" Dia. x 3" H (7.62 cm x 7.62 cm).
Operating Temperature:
-55°C to +85°C.
Storage Temperature:
-55°C to +85°C.
Humidity:
To 95% noncondensing.
Certification:
UL, FCC, CE, C-UL.
Contact TrueTime for the certification of specific options.
Alphanumeric Front Panel Display:
Initialization parameters,
time of year, as well as alarm/status messages may be
viewed on the 2-line, 32-character LCD.
Keypad:
0–9; up, down, left, and right arrows; CLR,
FUNC/ENTR, TIME, STATUS, POSITION.
Serial I/O:
Full user-selectable RS-232 communication protocol
up to 19200 baud.
Front Panel Time Display:
LCD type, 10 digits, 1 line.
Default is time-of-year.
Size:
6.9" x 0.85" (17.53 x 2.16 cm)
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