Frequency Standards
FS700 LORAN-C frequency standard
· 10
−
12
long-term stability
· 10
−
10
short-term stability (10
−
11
opt. )
· NIST traceable frequency standard
· Reception throughout most of the
northern hemisphere
· Four 10 MHz outputs
· Phase detector with analog output
· 0.01 Hz to 10 MHz TTL output
· FS700 ... $2950
(U.S. list)
Stanford Research Systems phone: (408)744-9040
www.thinkSRS.com
Many complex electronic systems require a stable, highly
accurate timebase. Communication, automatic test and
measurement, and precision time-measurement systems all
require accurate frequency standards. Traditionally, users have
looked to atomic clocks (cesium) for high stability and
accuracy. With the FS700 LORAN-C Frequency Standard,
cesium-clock stability is now available at a fraction of the cost
of atomic standards. The FS700 serves as a NIST traceable
frequency reference in the US, Europe and Asia.
Cesium Stability
More than 50 LORAN-C transmitters are maintained
throughout the Northern Hemisphere by the US Coast Guard.
The timing of their transmissions is controlled by cesium
clocks located at each transmitter site. The FS700 extracts the
timing information from the transmitted signal and uses it to
frequency-lock its own highly stable oscillator. The result is a
10 MHz output signal with the same stability as the cesium
clock used to generate the LORAN-C transmissions.
Frequency Outputs and Phase Detector
Four 10 MHz sine wave outputs are available at the rear panel
of the instrument, and an additional front-panel, adjustable
frequency TTL source is also provided. A built-in phase detector
measures the phase shift between an external timebase and the
internal frequency source, allowing you to easily calibrate
precision oscillators between 100 kHz and 10 MHz.
FS700 LORAN-C Frequency Standard
www.thinkSRS.com
West Coast USA Fallon, Nevada, USA
99400 µs George, Washington, USA
Middletown, California, USA
Searchlight, Nevada, USA
Canadian West Coast Williams Lake, BC, Canada
59900 µs Shoal Cove, Alaska, USA
George, Washington, USA
Port Hardy, BC, Canada
North Central USA Havre, Montana, USA
82900 µs Baudette, Minnesota, USA
Gillette, Wyoming, USA
Williams Lake, BC, Canada
South Central USA Boise City, Oklahoma, USA
96100 µs Gillette, Wyoming, USA
Searchlight, Nevada, USA
Las Cruces, New Mexico, USA
Raymondville, Texas, USA
Grangeville, Louisiana, US
Great Lakes Dana, Indiana, USA
89700 µs Malone, Florida, USA
Seneca, New York, USA
Baudette, Minnesota, USA
Boise City, Oklahoma, USA
Southeast USA Malone, Florida, USA
79800 µs Grangeville, Louisiana, USA
Raymondsville, Texas, USA
Jupiter, Florida, USA
Carolina Beach, NC, USA
Northeast USA Seneca, New York, USA
99600 µs Caribou, Maine, USA
Nantucket, Massachusetts, USA
Carolina Beach, NC, USA
Dana, Indiana, USA
Canadian East Coast Caribou, Maine, USA
59300 µs Nantucket, Mass., USA
Cape Race, Newfoundland,
Fox Harbor, Labrador, Canada
Newfoundland Coast Comfort Cove, Canada
72700 µs Cape Race, Canada
Fox Harbor, Canada
Bo Bo Norway
70010 µs Jan Mayen, Norway
Berlevag, Norway
Eidi Eidi, Faeroe Island, Denmark
90070 µs Jan Mayen, Norway
Bo, Norway
Vaerlandet, Norway
Loop Head, Ireland
Leassay Leassay, France
67310 µs Soustons, France
Loop Head, Ireland
Sylt, Germany
Sylt Sylt, Germany
74990 µs Lessay, France
Vaerlandet, Norway
Mediterranean Sea Sellia Marina, Italy
79900 µs Lampedusa, Italy
Estartit, Spain
Kargabaruu, Turkey
LORAN-C Station List
Stanford Research Systems phone: (408)744-9040
www.thinkSRS.com
Saudi Arabia North Afif, SA
88300 µs Salwa, SA
Al Hamasin, SA
Ash Shaykh Humayd, SA
Al Muwassam, SA
Saudi Arabia South Al Khamasin, SA
70300µs Salwa, SA
Afif, SA
Ash Shaykh Humayd, SA
Al Muwassam, SA
Western Russia Bryansk, Russia
80000 µs Petrozavodsk, Russia
Solnim, Russia
Simferopol, Ukraine
Syzran, Russia
Eastern Russia Aleksandrovsk, Russia
79500 µs Petrozavodsk, Russia
Ussuriysk, Russia
Tokachibuto, Japan
Ohotosk, Russia
East Asian Pohang, Korea
99300 µs Kwang-Ju, Korea
Gesashi, Okinawa
Niijima, Japan
Ussuriisk, Russia
China North Sea Rongcheng, PRC
74300 µs Xuancheng, PRC
Helong, PRC
China East Sea Xuancheng, PRC
83900 µs Raoping, PRC
Rongcheng, PRC
China South Sea Hexian, PRC
67800 µs Raoping, PRC
Chongzuo, PRC
Northwest Pacific Niijima, Japan
89300 µs Gesashi, Okinawa
Miamitorishima, Japan
Tokatibutto, Hokkaido, Japan
Pohang, Korea
Russia-American Petropavlo, Russia
59800 µs Attu, Alaska
Aleksandrovsk, Russia
North Pacific St. Paul, Pribilof Is, Alaska, USA
99900 µs Attu, Alaska, USA
Point Clarence, Alaska, USA
Narrow Cape, Kodiak Is, USA
Gulf of Alaska Tok, Alaska, USA
79600 µs Narrow Cape, Kodiak Is, USA
Shoal Cove, Alaska, USA
Port Clarence, Alaska, USA
Bombay Dhrangadhr, India
60420 µs Veraval, India
Billamora, India
Calcutta Balasore, India
55430 µs Diamond Harbour, India
Patpur, India
Receiver
Sensitivity Will lock with signal-to-atmospheric
noise ratio of −10 dB or better
LORAN output Filtered and gain controlled antenna
signal, typically 6 Vpp
Station search All available stations programmed,
Auto-Seek finds and tracks
strongest station
Notch filters Six adjustable −30 dB notch filters
(three at 40 to 90 kHz, three at 110
to 220 kHz)
Frequency
Frequency stability
Long-term 10
−12
(same as LORAN-C
transmitter cesium clock)
Short-term 10
−10
(standard oscillator)
10
−11
(low phase noise option)
Outputs Four 10 MHz outputs, 1 Vpp sine
into 50 Ω
LOCK output Rear-panel TTL indicates
receiver lock
Front-panel output TTL level output from 0.01 Hz to
10 MHz in a 1−2.5−5 sequence
Internal Oscillator
Standard Option 01
Frequency 10.000 MHz 10.000 MHz
Type (ovenized) AT-cut SC-cut
Aging 5 × 10
−10
/day 5 × 10
−10
/day
Allan variance (1s) 5 × 10
−11
5 × 10
−12
Stability (0 to 50 °C) 5 × 10
−9
<2 × 10
−9
Phase noise
10 Hz −125 dBc/Hz
100 Hz −130 dBc/Hz −155 dBc/Hz
1 kHz −165 dBc/Hz
Phase Meter
Frequency output 0.01 Hz to 10 MHz in 1−2.5−5
sequence, TTL level. Can be
50 Ω terminated.
Oscillator input 1 kΩ, 0.5 V min., 5.0 V max.
Phase output 0.01 V/degree, 0 to ±360°. Output
proportional to phase difference
between OSC IN and
FREQUENCY OUTPUT for
frequencies between 100 kHz
and 10 MHz.
Computer Interface
GPIB (standard) IEEE-488 compatible interface. All
instrument functions can be controlled.
RS-232 (optional) 300 baud to 19,200 baud DCE serial
interface. All instrument functions
may be controlled.
FS700 Specifications
Stanford Research Systems phone: (408)744-9040
www.thinkSRS.com
Antenna
Type 100 kHz active antenna with 40 kHz
bandwidth band-pass filter in base
Height 102"
Material Fiberglass whip
Base 2" dia. × 7.5", PVC
Mounting 3/4" FIPT
Output 50 Ω nominal, female BNC
Environmental −40 °C to 60 °C, 0 % to 100 % RH
Lightning protection module (opt.)
Surge 18,000 A IEEE 8/20 waveform
(based on ANSI C62.1)
Frequency range DC to 30 MHz
Throughput energy <16 µJ (based on 1 kV/nS
waveform)
Insertion loss <0.25 dB
General
Operating 0 °C to 50 °C
Power 100/120/220/240 VAC,
50/60 Hz, 50 W
Dimensions 17" × 3.5" × 17" (WHD)
Weight 14 lbs.
Warranty One year parts and labor on defects
in materials and workmanship
Ordering Information
FS700 LORAN-C receiver (w/ GPIB, $2950
rack mount kit and antenna)
Option 01 Low phase noise oscillator $450
Option 02 RS-232 interface $350
O700ANT Replacement antenna $250
O700LNG Lightning protection module $100
FS710 10 MHz distribution amplifier $1000
FS700 rear panel
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