Brandywine IBU-240 User manual

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User Guide
IRIG Distribution Amplifier
Model IBU-240
P/N 019000001
Revision A
February 2006
Brandywine Communications
1153 Warner Avenue
Tustin, CA 92780
[phone]
[phone]
http://www.brandywinecomm.com

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Revision History
REVISION DATE COMMENT
NC 08-31-04 Original release of IBU-240 user guide.
A 02-20-06 Section 1.1.3 Fault/Status added.

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

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1 Specifications
1.1 Inputs
1.1.1 Time Code Input
•Frequency: 300 Hz – 50 KHz
•Amplitude : 4 V pp
•Input Impedance: 600 ohm
•Number of Inputs: 2 with auto selection and manual override from the
front panel toggle switch
•Connector Type: BNC
•Isolation: transformer coupled
1.1.2 Fault Discrete (Optional)
•Number of Inputs: 2
•Level: TTL
•Link selectable for active high or low
•Forces a changeover when active for on-line reference
1.1.3 Fault/Status
•Connector Type: DB-9 Female
•Mating Connector: AMP P/N 747904-2
1.2 Outputs
1.2.1 Time Code Output
•Number of Outputs: 24
•Connector Type: BNC
•Output Protection: short circuit proof
•Output Level: same as input
•Isolation: transformer coupled
•Output Impedance: 600 ohm

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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:
o10 – 95% non-condensing
1.3.3 Power
•115/230 VAC 50/60 Hz
•< 25 W
1.3.4 Physical
•Dimensions: 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
IBU-240 CONFIGURATION SHEET
PART NUMBER 019000001
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
J3 TIME CODE A INPUT 1.5 V pp b
J2 TIME CODE B INPUT 1.5 V pp b
J4 – J27 TIME CODE OUTPUT 1.5 V pp b
AC POWER 115 VAC
b

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3 Unpacking and Installation
3.1 Unpacking
Carefully remove the IBU-240 from the shipping carton. The following items
should be included in the shipment:
•1 IBU-240
•1 power cord
•1 user guide
Note the power entry module on the rear of the IBU-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 IBU-240 WILL BE DAMAGED IF THE INCORRECT AC LINE
SETTING IS USED.
WARNING:
REMOVE THE POWER CORD FROM THE IBU-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.

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3.2 Installation
The IBU-240 should be bolted directly into a 19” rack mount enclosure or
mounted on a shelf. The IBU-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
IBU-240 is not mounted on a shelf.
3.3 Connections
Insert the power cord provided in the shipment into the rear of the 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 1 KHz.
Connect the output cables to the desired output connectors. Any unused
connectors may be left un-terminated.

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3.3.1 Alarm Input Connection
The IBU-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 that there is a fault (e.g. GPS not tracking)
on the reference signal even though the time code input signal may be present.
The factory standard IBU-240 configuration is a logic HI signal on the ALARM IN
pin indicates that the input is GOOD. A built in pull-up resistor ensures that if no
ALARM IN connection is made, the reference is still considered good. To
change the polarity of the ALARM IN, remove the top cover of the IBU-240 and
set the links to the link settings seen in the tables shown 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

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4 Operation
For a better understanding of the IBU-240 front panel controls and indicators,
refer to the diagrams located at the end of the user guide.
4.1 Powering the IBU-240
Once all connections to the IBU-240 have been made, apply power to the unit by
moving the On/Off switch to the on position. The On/Off switch is located on the
rear panel of the power entry module.
Verify that the two green LEDs for Reference A Available (1) and Reference B
Available (2) are illuminated. This indicates that the IBU-240 has detected the
presence of the time code input references.
Place the Reference Select switch (3) in the center (AUTO) position. The green
Reference A Online LED (4) and the AUTO LED (6) should illuminate. This
indicates that the IBU-240 outputs will be driven from Reference A and if
Reference A fails, it will automatically switch to Reference B.
The IBU-240 is now ready for operation.
4.2 Selecting the Input Reference
The external reference time code used is selected by the Reference Select
switch (3). Moving the switch to the left position will select input A as the
reference. Moving the switch to the right position will select input B as the
reference. The center (AUTO) position of the switch will use Reference A as the
input only if it is present and the status indicator indicates that it is good.

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4.3 Fault Indicator
The red LED on the front panel indicates that one or more of the outputs have a
low signal. The four potential causes for a low signal are listed below:
1. The input signal level is too low therefore the output signal monitors have
registered the low level as a fault.
2. Input B has been manually selected and there is no input signal
connected to Reference Input B.
3. One or more output buffers have failed.
4. There is a short on an output cable.

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5 Maintenance and Troubleshooting
There is no preventive maintenance required for the IBU-240. Moreover, no
periodic calibration is required.
SYMPTOM POTENTIAL CAUSE CORRECTIVE ACTION
No signal
outputs
1. There is no input
reference.
2. The Reference Select
switch is selecting
Reference B and no
source is connected to
the Reference B input.
1. Connect the reference
input.
2. Select an internal source.
Fault light is
illuminated 1. The input signal level is too low.
2. There is a failed output
driver.
3. There is an excessive
load on one or more
outputs.
4. The output level is
adjusted too low.
1. Increase the input signal
level.
2. Return unit to factory for
repair.
3. Disconnect the output
loads one by one until the
overloaded output is
isolated. Outputs should
not have loads < 50 ohm.
4. Isolate the low output level
and adjust for a level > 10
dBm.

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6 Diagrams
FIGURE DESCRIPTION
1 IBU-240 Front Panel
2 IBU-240 Rear Panel
3 IBU-240 Mechanical Outline