Digital alert systems R177M Baseband Switch User Manual
- June 3, 2024
- Digital Alert Systems
Table of Contents
alert systems R177M Baseband Switch
User Manual
P/N 1340192
07092019
Digital Alert Systems
100 Housel Ave
Lyndonville NY 14098-0535
585-765-2254 fax
585-765-9330
www.digitalalertsystems.com
WARRANTY
Digital Alert Systems, Inc. (DAS) 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 two years 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 Digital Alert Systems, 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 Digital Alert Systems, 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 Digital
Alert Systems 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 Digital Alert Systems unless in writing signed
by a duly authorized representative of Digital Alert Systems.
In the event of a breach of the foregoing warranty, the liability of Digital
Alert Systems shall be limited to repairing or replacing the non-conforming
goods and/or defective work, and in accordance with the foregoing; Digital
Alert Systems shall not be liable for any other damages, either direct or
consequential.
RETURN TO FACTORY POLICY:
Materials returned to DAS must have a Return Material Authorization number. To
obtain an RMA number, contact our A/V Switching & Control Customer Service bye
mailing:
support@digitalalertsystems.com; or
calling 585-765-2254 or faxing
585-765-9330. Customers have 30 days to
determine that the product ordered fills their need and performs as described
in DAS’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. DAS reserves the
right to repair or replace units under warranty.
General Description
Developed especially for the small cable operator, the model R177M offers
inexpensive baseband switching for full screen and audio replacement in full
compliance with FCC EAS requirements.
The R177M provides 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.
The R177M 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. The R177M can also be used as a “stereo
slave” unit.
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.
Specifications
| Video Input Level: | 1 V p~p, (75Ω) |
|---|---|
| Video Frequency Response: | 0 to 40 MHz, -3 db |
| Video Output Level for Loop through: | 1 V p~p, 0 dB buffered |
| Video Connectors: | 75Ω ‘F’ connectors |
| Audio Input Level: | 0 dB, ~.7 volts p~p nominal |
| Audio Frequency Response: | 0 to 30 KHz, -3 dB, 600 Ω Term In/Out |
| Master Audio Output Level | Adjustable, ± 3 dB nominally.7 volts p~p into 600 |
Ωs buffered
for loop through:| Detachable screw terminals
Audio Connectors:| Contact closure to Ground. Independent Video and Audio
contact closure to GND or recessed push buttons on panel
Slave Switching
(or Master used as Slave)| DC voltage on Audio Lines, or push 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.
Installation
The R177M is designed to mount on the rear of a standard 19-inch equipment
rack.
Mount the Master unit onto the equipment rack near the audio signal sources
requiring stereo switching.
Mount the Slave units 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 audio source 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 unit as detailed in Figure 1.
Connect all remaining Slave units to each other in the same manner, as indicated in Figure 1 on the following page.
Connect the 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 9.
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 Figure 1 on the following page.
Tie the VIDEO and AUDIO terminals at the end of the R177M terminal strip together and connect to the Character Generator at RELAY 1 – NO. Connect GND on the terminal strip to RELAY 1 – COM.
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.
Master/Slave EAS Audio Connections
Program Source to Controlling R177
Master is shown. For connections to a Master used 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. 
References
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