Taref3 Precision Timing Generator

Technology has moved well beyond split-second coordination of critical functions. Today’s digital world activity is calibrated to the millionth or billionth of a second, which can make timing and synchronization a real adventure for DTV engineers.

German manufacturer R.A.M. Gmbh draws on 15 years of expertise to produce a precision timing generator for DTV transmission feeds measured in nanoseconds.  It provides economical atomic timing standard accuracy for television, cable TV and satellite operators. The Taref series of precision timing generators are engineered to seamlessly coordinate digital TV bit streams and transmissions, single frequency transmitter systems, multiplexer systems, telecommunication networks and measurement equipment.

 

RAM Taref3 Precision Timing Generator

 

The slender, 19-inch-long rack-mounted instrument features three LED monitoring lights on the front so technicians can tell at a glance when the clock is locked on a GPS satellite. From incoming data, operators can quickly determine how many satellites are visible to the clock, the number being tracked and the longitude, latitude and height of each, as well as the coordinated universal time.  With a GPS system, the accuracy of the precision timing generator is better than 1 * 10 ^-10.

The instrument’s output is made cesium-standard stable by disciplining an oven-controlled crystal oscillator (OXCO) with precise GPS satellite signals.

The Taref3™ precision timing generator offers multiple output frequency options, including 10 MHz, 1.544 MHz, 2.048 MHz and custom selections. Precise one second pulses locked to UTC are standard. Phase noise levels during operation are extraordinarily low.

The device may be controlled by a PC through a USB port. It can be provisioned as a redundant system and offers multiple output capabilities. Universal power inputs include 12 VDC, 48 VDC, 115 and 220 VAC at 50/60 Hz.

 

Taref3 precision timing generator rear panel

 

The Taref3™ is a full-service time standard instrument, but engineers faced with even more stringent timing requirements should consider the Taref30™ timing generator. It has the stability of a rubidium reference clock and is capable of GPS-independent operation after initial calibration to GPS. Updated at least annually with the Taref300™ as a GPS transfer standard, the Taref30™ eliminates the need for exterior GPS antenna access. It is ideal for interior building installations, shielded secure spaces and other difficult environments.

 

Status LED´s	3, LEDs on the front panel 1, clock output ok (green) 1, oven (ok green, yellow at warm up) 1, GPS/Service ( blinking green acquiring satellites, green continuous GPS locked, red system alarm)
GPS-receiver Receiving frequency Code Receiving channels Sensitivity Synchronization time required Synchronization at install. place	1575.42 MHz C/A (coarse acquisition, civil access ) 6, continuously ≤ - 134 dBm ≤  20 min. first operation on site automatic positioning
Reference oscillator Type Frequency Output level Phase noise ( 10 KHz carrier offset ) ( 1 KHz carrier offset ) Short term stability (Allan variance) Aging OCXO unlocked to GPS Frequency stability temperature	OCXO 10 MHz + 6dBm/50Ω, sine wave ≤ - 155 dBc/Hz (typ.) ≤ - 150 dBc/Hz (typ.) ≤ ± 5 • 10-12 controlled by GPS ≤ 3 • 10-10 /day < 5 • 10-10 (5°C...45 °C)
2.048 MHz frequency reference output Frequency Level Connector Short term stability Uncontrolled	1 x 2.048 MHz 1 Vrms/ 120 Ω differential, sine wave ( G 703 ) customized see reference oscillator see reference oscillator
I/O	USB, driver for PC available for remote control Ethernet ( option with NTP/IRIG B ) Relay output for alarm
Output data	Status of GPS receiver Number of satellites visible Number of satellites tracked Time, date (UTC) Position (longitude, latitude, height) Frequency offset OCXO – GPS Alarm status
Options: Frequency output	• 10 MHz +6dBm / 50 Ω, sine wave • 1 PPS (≤  ± 100 nS respect to UTC, level TTL, 500 µ S width) • customized frequencies, 500 KHz ... 2.400 MHz in 1 Hz steps programmable • NTP function by ethernet • IRIG B
Multiport coupling	same signal output in blocks of 4 expandable ( 4 x 2.048 MHz, 4 x 10 MHz )
Multichannel	4 channels signal outputs ( DDS ), each programmable on steps of 1 Hz
Redundant systems	with automatic switch over
Power supply	65 V AC ....  250 VAC, 50 / 60 Hz 18 V... 72 VDC ( 12 VDC ... 60 VDC alt. ) automatic switch over at power fail consumption 28 W max. (basic unit 230 VAC) 14 W at 48 VDC supply
Dimensions	19“ Rack mount, height 44 mm, depth 400 mm Weight 3.8 kg

 

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