Model R177M and R177S
Baseband Switch
Installation Guide
P/N 1340192
082304
Monroe Electronics
100 Housel Ave
Lyndonville NY 14098-0535
800-821-6001 585-765-2254 fax 585-765-9330
www.monroe-electronics.com
2
Table of Contents
Warranty 3
General Description 4
Specifications 5
Installation 6
Operation & Adjustments 7
Master/Slave Audio Connections 8
Program Source Connections 9
Baseband System Connections 10
Specifications subject to change without notice.
P/N 1340192
Rev A 5/15/02
3
WARRANTY
Monroe Electronics, Inc. warrants to the owners, each instrument and sub-assembly
manufactured by them to be free from defects in material and workmanship for a period of one
year after shipment from factory. This warranty is applicable to the original purchaser only.
Liability under this warranty is limited to service, adjustment or replacement of defective parts
(other than fuses or batteries) on any instrument or sub-assembly returned to the factory for this
purpose, transportation charges prepaid.
This warranty does not apply to instruments or sub-assemblies subjected to abuse, abnormal
operating conditions, or unauthorized repair or modification.
Since Monroe Electronics, Inc. has no control over conditions of use; no warranty is made, or
implied as to the suitability of our product for the customer's intended use.
THE WARRANTY SET FORTH IN THIS ARTICLE IS EXCLUSIVE AND IN LIEU OF ALL
OTHER WARRANTIES AND REPRESENTATIONS, EXPRESSED, IMPLIED OR STATUTORY
INCLUDING, BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS. Except for obligations expressly undertaken by Monroe Electronics, in this
warranty, Owner hereby waives and releases all rights, claims and remedies with respect to any
and all warranties, express, implied or statutory (including without limitation, the implied
warranties of merchantability and fitness), and including but without being limited to any
obligation of Monroe Electronics with respect to incidental or consequential damages, or
damages for loss of use. No agreement or understanding varying or extending the warranty will
be binding upon Monroe Electronics unless in writing signed by a duly authorized representative
of Monroe Electronics.
In the event of a breach of the foregoing warranty, the liability of Monroe Electronics shall be
limited to repairing or replacing the non-conforming goods and/or defective work, and in
accordance with the foregoing; Monroe Electronics shall not be liable for any other damages,
either direct or consequential.
RETURN TO FACTORY POLICY:
Materials returned to Monroe must have a Return Material Authorization number. To obtain a
RMA number, contact our A/V Switching & Control Customer Service at 585-765-2254 or fax
585-765-9330. Customers have 30 days to determine that the product ordered fills their need
and performs as described in Monroe’s literature. Units returned for approved repair or credit,
must be in the original packaging including all parts and paperwork plus be in very good
physical condition. If not, the customer is billed the cost to refurbish the unit and for missing
accessories and merchandise. No products may be returned for exchange or credit after 12
months of the shipment date. Monroe reserves the right to repair or replace units under
warranty.
4
General Description
Developed especially for the small cable operator, the model R177 offers inexpensive baseband
switching for full screen and audio replacement in full compliance with FCC EAS requirements.
Available in two configurations; “Master” (R177M) and “Slave Monaural” (R177S), both units
provide amplification and switching of baseband audio follow video signals and allow the
insertion of audio and video from an EAS control system into all the channels at a cable
headend.
When the proper alert codes are received by the EAS system, baseband video signals from
each channel are switched from the programs they normally show to the alarm video provided
by a character generator. Audio is similarly switched. When the EAS alert (or test) has
concluded the unit(s) switch back to the program audio and video. Switching of the audio
signals and video signals can be done independently if desired.
Each unit has eight audio and video switches. EAS Audio and Video signals are buffered with
adjustable ±3 dB amplifiers for isolation and signal quality. Individual test switches allow
separate testing of the audio and video relays in the unit, allowing less intrusive testing when
desired.
The modularity of the design, with 8 complete switch pairs per unit, allows the operator to mount
the unit where he can minimize cable runs and complexity. Mounting it on the rear of the
equipment rack saves valuable space for other uses.
R177M
The Model R177M Master Baseband Switch is the “master” unit and provides balanced stereo
audio follow baseband video switching on a contact closure. The baseband video, audio
signals, and control signals are looped through to supply succeeding units.
High quality and long life RF and Audio switching relays ensure low loss and high isolation for
reliable system performance.
Control of this unit to switch audio, video, or both, passes through to any succeeding units for
EAS alarm switching.
The R177M can also be used as a “stereo slave” unit.
R177S
The Model R177S Stereo Baseband Switch operates as a “slave” unit with the Model R177M
unit. It provides balanced monaural audio and wide bandwidth baseband video switching.
The “loop through” video and audio signals are internally buffered with an audio gain
adjustment.
Switching relays provide isolation and signal handling capabilities to satisfy any user
requirements.
5
Specifications
Video Input Level: 1 V p~p, (75)
Video Frequency Response: 0 to 40 MHz, -3 db
Video Output Level for Loop through: 1 V p~p, 0 dB buffered
Video Connectors: 75 ‘F’ connectors
Audio Input Level: 0 dB, ~.7 volts p~p nominal
Audio Frequency Response: 0 to 30 KHz, -3 dB, 600 Term In/Out
Master Audio Output Level Adjustable, ± 3 dB nominally
for loop through: .7 volts p~p into 600 s buffered
Audio Connectors: Detachable screw terminals
Master Switch Control Inputs: Contact closure to Ground. Independent
Video and Audio contact closure to GND
or recessed push buttons on panel
Slave Switching DC voltage on Audio Lines, or push
(or Master used as Slave) buttons for testing Audio/Video for that
unit only.
Power Requirements:* 16 VAC 50/60 Hz, ± 10%,
½ A AC
Physical Size: 19.0” W x 3.5” H x 5.0” D
Weight: 2 lbs.
*12 VAC power supplies will work provided the supply is stable at 12V under low
line conditions. However, 16 VAC supplies are provided and are recommended
for optimal reliability.
6
Installation
The R177 units are designed to mount on the rear of a standard 19-inch equipment
rack.
Mount the Master Stereo unit, R177M, onto the equipment rack near the audio signal
sources requiring stereo switching.
Mount the Slave Monaural units, R177S, onto to the equipment rack near the signal
sources they will be switching.
Connect the wires from the power supplies to each unit, 12 or 16 VAC (Refer to * note
on page 4.) on the screw terminal header. No specific polarity needs to be observed
when connecting the first power supply, however, all subsequent supplies must
be connected with the same wire orientation as the first supply.
Connect the Audio Outputs from the MIP 921e to the Audio Inputs + and – on the screw
terminal header of the Master unit. A Chassis Ground connection is supplied for a
shield wire.
Connect the EAS Audio Out +, –, and GND connections on the screw terminal header
of the Master unit to the EAS Audio In of the first Slave Monaural unit as detailed in
Figure 1. If using a Master unit as a Slave Stereo unit refer to Figure 2 on the following
page. Connect all remaining Slave units to each other in the same manner, as
indicated in Figure 1 or 2 on the following page.
Connect the CEMS 0500 Character Generator Video Out to the EAS Video Loop input
on the Master unit. Connect the Video Loop Output to the first Slave unit Video Loop
Input. For all subsequent Slave units in the chain, connect the Output from the
preceding unit to the Input of the unit being added.
Connect the program audio source inputs to the left and right Audio inputs for each
switch set as labeled on the panel. Connect the Video Inputs and Outputs in the same
manner. Refer to Figure 3 on page 7.
To complete the connection 600 Ω terminators or resistors must be installed across the
EAS Audio In + and – terminals on the Master unit and also across the EAS Audio +
and – terminals on the last Slave unit in the chain. Refer to Figures 1 and 2 on the
following page.
Tie the VIDEO and AUDIO terminals at the end of the R-177M terminal strip together
and connect to the CEMS 0500 Character Generator at RELAY 1 – NO. Connect GND
on the terminal strip to RELAY 1 – COM on the CEMS 0500.
Operation and Adjustments
Plug in all power supplies upon completion of all wiring.
Verify operation by pressing the Audio and Video Test pushbuttons recessed in the
panel. All relays should switch for either Video or Audio subject to which pushbutton
has been pressed.
Upon verifying operation, set the Audio Input from the EAS alarm source to 1 V p ~ p,
maximum. Set the Video Input from the EAS alarm source to 1 V p ~ p, maximum.
Check the outputs to the Audio and Video switches. Adjust the Audio Gain
potentiometer to obtain an output of the same level as the input.
Adjust the two Video Gain potentiometers in the same manner.
7
Audio Input 600Ω
Master
Slave #1
-
EAS Audio In +
Master
Slave #1
Master as Slave
Master/Slave EAS Audio Connections
EAS Audio IN –
EAS Audio In +
GND
EAS Audio In -
GND
EAS Audio In +
EAS Audio Out –
EAS Audio Out +
GND
Master/Slave EAS Audio Connections with a Master used as a Slave
EAS Audio In -
EAS Audio In +
EAS Audio Out –
EAS Audio Out +
GND
GND
Audio Input 600Ω
8
EAS Audio In
GND
Figure 2
Figure 1
EAS Audio In -
GND
EAS Audio In +
EAS Audio Out –
GND
EAS Audio Out +
Last Slave
EAS Audio In -
GND
EAS Audio In +
Last Slave
EAS Audio In -
EAS Audio In +
GND
600Ω Termination
600Ω Termination
Program Source to Controlling R177
Master is shown. For Slave Monaural connections, a single connector is provided. For connections to a Master used
R
as a Slave, connect to left side connectors only. One set of Audio/Video switching connections are shown. All
subsequent connections should be made in the same manner.
Video Out
Video In
L
Audio Out -
Audio Out +
GND
Audio In -
Audio In +
Figure 3
Audio In +
Audio In GND
Audio Out +
Audio Out -
Loading...