Brandywine FDU-240 User manual

MANUAL P/N 900000035 REV C
User Guide
Frequency Distribution Amplifier
Model FDU-240
P/N 022000001
Revision C
March 2006
Brandywine Communications
1153 Warner Avenue
Tustin, CA 92780
[phone]
[phone]
http://www.brandywinecomm.com/

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Revision History
REVISION DATE COMMENTS
NC 07-14-2004 Original release of FDU-240 user guide.
A 09-08-2004 Revision of entire FDU-240 user guide.
B 02-21-2006 Customer’s comments incorporated into FDU-240 user guide.
C 03-21-2006 Added customer feedback page.

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Safety Warnings
WARNING: This unit contains lethal AC voltages.
Disconnect the unit from the AC supply before removing
the cover.
WARNING:
The lightning flash with an arrowhead inside of an equilateral triangle is
intended to alert the user to the presence of un-insulated “dangerous
voltage” within the product’s enclosure. The “dangerous voltage” may be
of sufficient magnitude to constitute as a risk of electrical shock to people.
CAUTION:
The exclamation point inside of an equilateral triangle is intended to alert
the user to the presence of important operation and maintenance
instructions in the user guide.

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Table of Contents
1Specifications.......................................................................................................................... 5
1.1 Inputs ........................................................................................................................... 5
1.1.1 Reference Frequency Input ................................................................................... 5
1.1.2 Fault Discrete (Optional)........................................................................................ 5
1.1.3 Fault/Status ........................................................................................................... 5
1.2 Outputs.........................................................................................................................6
1.2.1 Reference Frequency Output ................................................................................ 6
1.3 Switches and Indicators ............................................................................................... 7
1.3.1 Status LED Indicators............................................................................................ 7
1.3.2 Environmental........................................................................................................ 7
1.3.3 Power..................................................................................................................... 7
1.3.4 Physical ................................................................................................................. 7
2Option Configuration Sheet..................................................................................................... 8
3Unpacking and Installation......................................................................................................9
3.1 Unpacking .................................................................................................................... 9
3.2 Installation ....................................................................................................................9
3.3 Connections ............................................................................................................... 10
3.3.1 Alarm Input Connection ....................................................................................... 10
4Operation .............................................................................................................................. 11
4.1 Powering the FDU-240 .............................................................................................. 11
4.2 Selecting the Input Reference.................................................................................... 11
4.3 Fault Indicator ............................................................................................................ 11
5Maintenance and Troubleshooting ....................................................................................... 12
6Calibration ............................................................................................................................. 13
7Drawings ............................................................................................................................... 14

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1 Specifications
1.1 Inputs
1.1.1 Reference Frequency Input
•Frequency: 10 MHz ±0.5 ppm
•Amplitude : 0.5 V – 1 Vrms and nominal 1 Vrms factory set
•Input Impedance: 50 ohm
•Number of Inputs: 2 with auto selection and manual override from the
front panel toggle switch
•Connector Type: BNC
1.1.2 Fault Discrete (Optional)
•Number of Inputs: 2
•Level: TTL
•Link selectable for active high or active low
•Forces a changeover when active for online reference
1.1.3 Fault/Status
•Connector Type: DB-9 Female
•Mating Connector: AMP P/N 747904-2

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1.2 Outputs
1.2.1 Reference Frequency Output
•Number of Outputs: 24
•Connector Type: BNC
•Output Protection: short circuit proof
•Frequencies Available (same as input):
o10 MHz
o5 MHz
•Output Level: +13 ±2 dBm standard and specified at time of order
•Stability:
oWith External Reference Only:
+ Same as reference
oWith Free Running Internal Oscillator:
+ Stability vs. Temperature: ±3 x 10
-9
from 0 - 60°C
+ Aging: 5 x 10
-7
per year
•Harmonic Distortion: -45 dBc
•Cross Talk: -80 dBc
•Spurious: -80 dBc
•Phase Noise at 10 MHz:
OFFSET (Hz) SSB PHASE NOISE dBc/Hz
1 -90
10 -110
100 -140
1000 -150
10000 -160

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1.3 Switches and Indicators
1.3.1 Status LED Indicators
•Power (Green)
•Reference Input A Available (Green)
•Reference Input A Online (Green)
•Reference Input B Available (Green)
•Reference Input B Online (Green)
•Automatic Reference Selection Selected (Green)
•Fault (Red)
1.3.2 Environmental
•Temperature:
oOperating: -30 to +60°C
oStorage: -40 to +85°C
•Humidity: 10 - 95% non-condensing
1.3.3 Power
•115/230 VAC 50/60 Hz
•< 25 W
1.3.4 Physical
•1.72” H x 14.5” D x 17.00” W and 1U 19” rack mount
•Weight: 7.5 lbs nominal

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2 Option Configuration Sheet
FDU-240 CONFIGURATION SHEET
PART NUMBER 022000001
CONNECTOR FUNCTION LEVEL INSTALLED
J1 ALARM INPUT
PIN 1 STATUS A
PIN 2 STATUS B
PIN 3 NO CONN
PIN 4 NO CONN
PIN 5 NO CONN
PIN 6 GROUND
PIN 7 GROUND
PIN 8 GROUND
PIN 9 NO CONN
ACTIVE H__L b
ACTIVE H__L
b
b
REFERENCE A INPUT 1.0 V rms
b
J3
FREQUENCY 10 MHz
REFERENCE
A
SOURCE
EXTERNAL
_____b_____
FREE RUNNING
OCXO
____________
OCXO PHASE
LOCKED TO
REFERENCE
__________
REFERENCE B INPUT 1.0 V rms
b
J2
FREQUENCY 10 MHz
REFERENCE
B
SOURCE
EXTERNAL
____b______
FREE RUNNING
OCXO
____________
OCXO PHASE
LOCKED TO
REFERENCE
__________
FREQUENCY OUTPUT 1.0 V rms
b
J4 - J27
LEVEL 10 ±1 dBm
AC POWER 115 VAC
b

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3 Unpacking and Installation
3.1 Unpacking
Carefully remove the FDU-240 from its shipping carton. The following items
should be included in the shipment:
•1 FDU-240
•1 power cord
•1 user guide
Note the power entry module on the rear of the FDU-240 chassis. Please take
note of the voltage displayed on the rear of the power entry module and verify
that the voltage matches the local line’s voltage.
CAUTION:
THE FDU-240 WILL BE DAMAGED IF THE INCORRECT AC
LINE SETTING IS USED.
WARNING:
REMOVE THE POWER CORD FROM THE FDU-240 BEFORE
ADJUSTING THE LINE VOLTAGE.
If the AC line setting is incorrect, detach the power cord from the power entry
module. Use a small screwdriver to lift up the fuse cover on the power entry
module to remove the fuse holder. Reverse the fuse holder and re-insert the
fuse holder, making sure that the correct AC line voltage is now displayed on the
rear panel.
3.2 Installation
The FDU-240 should be bolted directly into a 19” rack mount enclosure or
mounted on a shelf. The FDU-240 when fully populated has up to 27 cables
attached to the rear panel, therefore it is recommended that some appropriate
cable strain-relief system be used to support these cables, particularly when the
unit is not supported by a shelf.

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3.3 Connections
Insert the power cord provided in the shipment into the rear power entry module.
Connect the input reference signals to the appropriate connectors on the rear
panel.
CAUTION:
FOR CORRECT OPERATION, REFERENCE FREQUENCY A
AND REFERENCE FREQUENCY B MUST BE THE SAME
FREQUENCY, WHICH IS TYPICALLY 10 MHz.
Connect the output cables to the desired output connectors. Any unused
connectors may be left un-terminated.
3.3.1 Alarm Input Connection
The FDU-240 may be used with an external reference such as the Brandywine
Communications GPS8 or PTS system that incorporates a discrete alarm signal.
This alarm signal is used to indicate a fault (e.g. rubidium out of lock) on the
reference signal, although the 10 MHz input signals may be present.
The factory standard FDU-240 configuration is a logic HI signal on the ALARM IN
pin indicating that the input is GOOD. A built in pull-up resistor ensures that if no
ALARM IN connection is made the reference is considered good. To change the
polarity of the ALARM IN, remove the top cover of the FDU-240 and set the links
to the link settings seen in the table below.
LINK SETTING REFERENCE A STATUS
LK1 2-3 HI – reference A is GOOD
LK1 1-2 LO – reference A is GOOD
LINK SETTING REFERENCE B STATUS
LK2 2-3 HI – reference B is GOOD
LK2 1-2 LO – reference B is GOOD