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Pendulum, Frequency Distribution Amplifiers.

Frequency Distribution system to a world leading telecom manufacturer.

Summary of Requirements:

  • The system needs to deliver two different frequencies: 2.048 MHz and 10MHz.
  • Distribution from the 10th Floor to several labs on each other floor.
  • Built in system redundancy.
  • Expandable, the system will need to be extended into Labs currently in design.
  • Fibre optic distribution preferred over Coax. (due to long distribution distances, limited space in cable runs, minimal noise pickup and lower cost).
  • One supplier.
  • Economical solution.

The Solution:

A solution was presented which was both flexible and economical for the customer.
  • Two GPS-12R; GPS-controlled Rubidium standards, each equipped with both 2.048 MHz (standard) and 10 MHz (optional) outputs. One units acts as the master reference, the other as the slave. Four DA-36; Distribution Amplifiers forming two independent redundancy switch over units for 2.048 MHz and 10 MHz respectfully.
  • Two DA-35 racks; one equipped with 2.048 MHz output boards and one with the 10 MHz output boards. These racks received the two master fibres from the redundancy switch system, and supplied all receiving rooms with a frequency reference over fibre. Pendulum System Distribution
  • Twenty One DA-36; With ether 2.048 MHz or 10 MHz output, at the receiving end of the fibres in all individual lab rooms.
    These units supply the end users with 4 Coaxial reference outputs each.
The picture to the right shows the two GPS-12R's placed on the top of the research facility, these in turn were connected to two GPS antennas on the roof, both units are equipped with outputs for the 2.048 MHz and 10 MHz.

Each four of the four main outputs were connected to an DA-36. Each pair were configured as a redundancy switch, with the outputs going to the two DA-35 units in the basement.

The DA-35 distribution racks is equipped with 1 DA35/23 (opto input card) and 4 DA-35/24/2 or DA-35/24/10 (for the 2.048 MHz and 10 MHz outputs).
This resulted in there being 16 output fibres per rack, of which 13 were actually used.

The Fibres were then distributed to all the labs in the building. Most labs having two DA-36 units installed for both 2.048 MHz and 10 MHz, some having just the one and one lab had 5 DA-36 units cascaded to give the required number of outputs.

The customer chose Pendulum Instruments as their supplier because of the ease of use and the quality that Pendulum instruments offers.


The customer received a full system solution, based on the need for redundancy, expansion possibilities of the system and the need of distributing a stable signal source via fibre over a longer distance.

Pendulum Instruments product flexibility and ability to provide a complete system solution that was economical for the customer.

One supplier provided the expertise and product range to satisfy the required parameters, investing in two GPS-12R, two DA-35 and several DA-63 units.

Featured Products

  • GPS-Disciplined Rubidium clock for close-to-Cesium clock Stability.
  • 2.048 MHz or 1.544 MHz plus 1pps standard outputs.
  • 5 & 10 MHz optional low-noise outputs for general lab use.
  • Internal battery option for transportation and mains free field use.
  • Optional -48 VDC option for stationary use in Telephone Exchange Stations.
  • Designs for point to multipoint frequency distribution.
  • Typically close to the frequency source but can be used at the receiving end where a large number of local outputs are needed (upto 40).
  • Up to 36 fibres and up to 1440 receiving outputs.




If you cannot find a product that meets your needs, please telephone us on 0208 868 1311 or email sales@aspen-electronics.com

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