CES VAD-1 User manual

Copyright CES 1998 Page 111/17/98
VAD-1
Universal Delay Module
Ref: MAN84
A CES PUBLICATION © 1998
Printed in USA
CES WIRELESS TECHNOLOGIES CORP.
925-122 South Semoran Blvd.,
Winter Park, FL 32792
Tel: [phone]
Fax: [phone]
e-mail: [email protected]
[email protected]

Copyright CES 1998 Page 211/17/98
VAD-1 Universal Delay Module
Installation Instructions
GENERAL DESCRIPTION
The VAD-1 provides a programmable audio delay from 2ms to 1 second. Selection of the delay time is achieved through solder
bridges or may occur serially. (The VAD-8 also available from CES provides a delay of up to 8 seconds).
INSTALLATION
Installation and programming of this CES product must be completed by a qualified two-way radio technician or engineer. CES
is not responsible for any operational problems caused by system design, outside interference, or improper installation. Observe
static prevention techniques.
Before Installing
The VAD-1 may be installed in almost any transmitter/receiver. The module should be programmed prior to performing the
actual installation.
Input Level Adjustment
The Input audio level can be adjusted by turning R18 to increase or decrease the input audio level. See Figure 2 for component
layout diagram.
Output Level Adjustment
The output audio level can be adjusted by turning R2 to increase or decrease the output audio level. See Figure 2 for component
layout diagram.
Time Delay Selection
Following Table 1 place solder bridges on the specified coding pads. X means solder bridge required, blank means leave
bridge open. See Figure 2 for the location of the solder bridges on the PCB. To control the delay time serially, short J16. For
programmable values not listed in Table 1, please contact CES or your local CES authorized distributor.
Mute Input
A mute input is provided to turn off the audio output. The polarity is programmable using jumper J15. Short J15 for active
High. Default is open, active Low. See Figure 2 for component layout diagram.
Wiring Interface
See Table 2 for wiring details.
Mounting Details
Mount the module to a suitable location in the transceiver, preferably away from high RF and sensitive receiving stages, with
the provided double-sided tape.

Copyright CES 1998 Page 311/17/98
Table 1. Program Jumpers
The VAD-1 is programmable in 2mS steps. For programmable sheets with all programmable values please contact
CES. X means bridge jumper
mSec J12 J11 J10 J9 J8 J7 J6 J5 J4 J3 J2 J1
2XXXXXXXXXXXX
20 XXXXXXXX XX
30 XXXXXXXX X
40 XXXXXXX XX
50 XXXXXXX XXX
60 XXXXXXX X
70 XXXXXX XXX X
80 XXXXXX XX
90 XXXXXX X XX
100 XXXXXX XXX
110 XXXXXX X X
120 XXXXXX X
130 XXXXX XXXXXX
140 XXXXX XXX X
150 XXXXX XX X X
160 XXXXX XX
170 XXXXX X X XX
180 XXXXX X XX
190 XXXXX X X
200 XXXXX XXX
226 XXXXX XXXX
250 XXXXX XX
276 XXXX XXX XX
300 X X X X X X X X
326 XXXX X XXX X
350 X X X X X X X
400 XXXX XXX
450 XXXX XXXXX
500 XXXX XX
550 XXX XXX XX X
600 X X X X X X X
650 XXX X XXX XX
700 X X X X X X
750 X X X X X X
800 XXX XXX
850 X X X X X X X X
900 XXX XXXXX
950 X X X X X X
1000 XXX XX
1024 XXX

Copyright CES 1998 Page 411/17/98
Specifications
Dimensions: 1.12 x 2.10 x 0.38 inches
Supply Input Voltage: 5.5 to 24 Volts DC
Module Delay Period: Programmable in 2 millisecond Steps from
2 ms to 1.024
Power Supply Input Current: 7.6 mA Typical @ 12v, no Audio Load
Converter Resolution: 14 Bits with MuLaw Compression
Converter Frequency Response: 200 to 3400 Hz
Converter Gain Variation Over
Frequency Response: 0.55dB
Noise Input into “codec” at 0.5VP-P 1.75%
Noise Input into “codec” at 2.5VP-P 4.25%
Module Audio Input: Pseudo-Differential or Single Ended with Level
Control
Module Audio Output: Single Ended with Level Control
Module Audio Output Drive
Impedance: 360 Ohm Typical
Module Audio Output Drive Voltage
with 600 Ohm Load: 4.75v P-P

Copyright CES 1998 Page 511/17/98
Figure 1. Circuit Diagram VAD-1

Copyright CES 1998 Page 611/17/98
Table 2. Wiring Diagram
J13 Color Description
Pin 1 Red 12 V: Connect to the radio’s + ve supply.
Pin 2 Black Ground: Connect to 0V (Ground).
Pin 3 Orange Ground: Connect to 0V (Ground).
Pin 4 Yellow Audio In: Connect to the input Audio source, (audio positive).
Pin 5 Light Green Audio In: Connect to the input Audio ground, (audio negative).
Pin 6 Blue Ground: Connect to 0V (Ground).
Pin 7 Violet Audio Output: Connect to the (transmit) audio stage, after the
microphone clipper/limited stages, and before the modulator circuit.
Pin 8 Gray Ground: Connect to 0V (Ground).
Pin 9 White Not Connected.
Pin 10 Brown Mute Input: This input can be used to turn off the audio output.
Pin 11 Dark Green Not Connected.
Pin 12 White/Red Not Connected.
Pin 13 White/ Blue Serial Send Enable: Serial Control of delay time.
Pin 14 Tan Serial Clock: Serial Control of delay time.
Pin 15 White/Green Serial Send Data: Serial Control of delay time.
For technical support call CES at the numbers below:
CES Wireless Technologies
925-122 S. Semoran Blvd.
Winter Park, FL 32792 USA
Phone: lnt. + 407-679-9440
Fax: Int. + 407-679-8110
E-Mail: [email protected]
Web Site: http://www.ceswireless.com
Copyright CES 1996. All rights reserved. Not to be reproduced in whole or in part without the written consent of
CES. All information contained in this document is carefully prepared and offered in good faith as a guide in the
installation, use, and servicing of our products. Installers must ensure that the final installation operates
satisfactorily, within the relevant regulatory requirements. We accept no responsibility for incorrect installation.
We reserve the right to change products, specifications, and installation data at any time, without notice. Printed
in the USA.
Limited Warranty

Copyright CES 1998 Page 711/17/98
CES Wireless Technologies (CES) warrants it's products to be free of defects in material and
workmanship and extends this warranty under intended use and normal service conditions to the
original owner for a period of two (2) years from the date of purchase.
This warranty does not apply to any product that has been subjected to repairs or alteration not
authorized by CES, or for any product that has been damaged due to accident, abuse, neglect,
vandalism, loss, unreasonable use, improper installations, lightning, fire, or water damage, or any
acts of God.
The obligations of CES are limited to repairing or replacing, at the option of CES, any product or
component that is returned to the factory all transportation charges prepaid, accompanied by
proof of purchase and which examination reveals to have been defective within the warranty
period stated above. CES does not assume, nor is any person authorized to assume for it, any
obligation other than that stated herein.
CES shall not be liable under this warranty, or any implied warranty, for the loss of use of the
product or for any other consequential loss or damage incurred by the purchaser, or fitness for a
particular purpose.