Equipment information

Racal Dana 9478 Frequency Standard
Manufacturer
Racal Dana
Model 9478
Date 1982
Category Measurement instruments
Group Frequency Standard
Description Frequency Standard Distribution System
Information
                                    The Racal-Dana Frequency Standard Distribution System 9478
provides a reliable and convenient means of generating and
distributing up to nine standard frequency signals, all
phase locked to a single Frequency Standard. Where more than
nine independent outputs are required, two or more systems
may be cascaded.

FREQUENCY STANDARD

The Frequency Standard used may be internally mounted. A
choice of two crystal oscillators from the Racal-Dana range
is offered. The specifications of these oscillators are
given in Section 1.

Alternatively an external master Oscillator or atomic
Frequency Standard may be used. External frequency standards
having outputs at 1 MHz, 2 MHz,

2.5 MHz, 5 MHz or 10 MHz are all suitable for use with the 9478.

Systems fitted with an internal Frequency Standard will
automatically lock to the input from an external standard
when such an input is present.

SYSTEM OUTPUTS

The nine BNC output sockets are mounted on the rear panel.
Each is fed from' an individual driver Amplifier and
provides a level of 1 V r.m.s. into 50 ft. Internal coaxial
links, which may easily be reset by the user, allow the
frequency at any output to be set to 1 MHz, 5 MHz, or 10 MHz.

STATUS INDICATORS

Each output channel is provided with an individual LED
indicator. These are mounted on the front panel, and light
when an output is present. In addition a TTL compatible,
logic '1' alarm signal is given at a rear panel mounted
connector if any output fails.

Two further front panel LED indicators are provided. One
lights when the system is in lock, and the Other when an
input from an external Frequency Standard is present. Both
indicators are repeated, in the form of TTL compatible logic
'1' levels, at a rear panel mounted connector.

These manuals are available for the above equipment:

Manual Type Service and User Manual Racal-Dana-10181-Manual-Page-1-Picture
Pages 83
Size 3.72 Mbytes (3897857 Bytes)
Language english
Revision 2.4.83
Manual-ID/Number TH 4015
Date 01 November 1982
Quality Scanned document, all readable.
Upload date
MD5 d2da6281ca9df50d90120f03bd8a3151
Downloads 61 since 03 February 2018
Information
1.	TECHNICAL SPECIFICATION	1-1

1.1	Specification	1-1

2.	GENERAL DESCRIPTION	2-1

2.1	Introduction	2-1

2.2	Frequency Standard	2-1

2.3	System Outputs	2-1

2.4	Status Indicators	2-1

2.5	Maintenance	2-1

3.	PREPARATION FOR USE	3-1

3.1	Power Supply	3-1

3.1.1	AC Voltage Range Setting	3-1

3.1.2	Line Fuse	3-1

3.1.3	Power Lead	3-2

3.2	Fitting the Fixed Rack Mounting Kit 11-1496	3-2

3.3	Setting the Output Channel Frequencies	3-3

3.4	External Status Indicator Connection	3-4

3.5	Connection of External Frequency Standard	3-5

3.6	Cascade Connection	3-5

3.7	Removal and Replacement of Covers	3-5

4.	OPERATING INSTRUCTIONS	4-1

4.1	Introduction	4-1

4.2	Description of Controls, Indicators and Connections	4-1

4.2.2	Front Panel Items	4-1

4.2.3	Rear Panel Items	4-1

4.3	Switching On	4-2

4.4	Switching Off	4-2

5.	PRINCIPLES OF OPERATION	5-1

5.1	Introduction	5-1

5.2	Principle of Operation	5-1

5.3	Technical Description	5-1

5.3.1	External Standard Input Circuit	5-1

5.3.2	External Standard Detector	5-3

5.3.3	Internal Standard Input Circuit	5-3

5.3.4	Internal Standard Detector	5-3

5.3.5	Phase Detector Drive Circuit	5-3

5.3.6	Loop Oscillator	5-4

5.3.7	Phase Detector Operation	5-4

5.3.8	The Loop Filter	5-5

5.3.9	Lock Indicator Circuit	5-5

5.3.10	Loop Outputs	5-5

5.3.11	Output Driver Amplifiers	5-6

5.3.12	Power Supplies	5-6
6.	MAINTENANCE	6-1
6.1	Introduction	6-1
6.2	Calibration Procedure	6-1
6.2.1	Test Equipment Required	6-1
6.2.2	Power Supply Tests	6-1
6.2.3	Loop Lock Setting	6-3
6.2.4	Output Level and Frequency Test	6-4
6.2.5	Spectral Purity Tests	6-4
6.2.6	Hum Sideband Test	6-6
6.2.7	Indicator and Monitor Output Test	6-7
6.2.8	Internal Frequency Standard Adjustment	6-8
7.	PARTS LIST AND CIRCUIT DIAGRAMS	

Parts List: Front and Rear Panel Assemblies	Parts List 1

Parts List: Frequency Distribution Board 19-1105	Parts List 3

Component Layout: Frequency Distribution Board 19-1105	Fig. 1

Circuit Diagram: Frequency Distribution Board 19-1105	Part 1
Fig. 2

Circuit Diagram: Frequency Distribution Board 19-1105	Part 2
Fig. 3
Racal-Dana-10181-Manual-Page-1-Picture


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