©1999 Hamtronics, Inc.; Hilton NY; USA. All rights reserved. Hamtronics is a registered trademark. Revised: 1/28/00
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GENERAL INFORMATION.
Functional Description.
The DVR-3 is a versatile pc board
module, which is designed primarily
as a voice id'er and message re-
corder for the REP-200T Repeater.
It is a special version of the general
purpose DVR-1 module. The differ-
ence is that the DVR-3 substitutes
direct control interfaces with the
COR-5 Control Board for the general
purpose timer and logic circuits on
the DVR-1, and the DVR-3 uses
audio off the air for recording in-
stead of a microphone.
The DVR-3 module is based on
the ISD-1020A chip, using direct
analog eeprom technology. The re-
cording is good speech quality,
equivalent to what you would expect
using a cassette tape recorder. The
solid-state recording lasts ten years
or more and requires no battery
backup.
Use of the DVR-3 requires firm-
ware version 2.06 or later in the
REP-200 Repeater. This includes all
repeaters manufactured after De-
cember 1993. Older repeaters can
be retrofitted by replacing the
eprom; no hardware changes to the
control board are required.
The COR-5 Controller provides
the means to enable either the
voice id or conventional cw id, and it
provides the triggering signal for the
DVR-3 module and the necessary
timing to ensure that the id occurs
at the proper time and that the
transmitter is keyed each time that
the id message is played back. It
also allows the message to be re-
corded and played back through
dtmf commands.
Enhancements.
The 20 seconds of recording time
normally is accessed all as one unit.
However, with the addition of some
external addressing switches, the
20 second capacity can be broken
up, any way you like, into multiple
messages. Although, switching cir-
cuitry to do this is not provided, the
address line connections are pr o-
vided, and information on how to
add switches to do your own en-
hancements is given later in the
manual.
Other enhancements may be
added to suit your application. With
a few changes, you can make the
message repeat periodically or loop
continuously.
Recording Quality.
The ISD-1020A is an amazing
new ic which implements an entire
digital voice recording and playback
system in one chip. This brings real
voice to the radio community at a
previously unheard-of low price.
HAMTRONICS
HAMTRONICS®® DVR-3 DIGITAL VOICE RECORDER
DVR-3 DIGITAL VOICE RECORDER
ASSEMBLY, INSTALLATION, AND OPERATION
ASSEMBLY, INSTALLATION, AND OPERATION
TABLE OF CONTENTS
GENERAL INFORMATION.............................................................. 1
Functional Description. ............................................................. 1
Enhancements. ........................................................................ 1
Recording Quality. .................................................................... 1
ASSEMBLY. ................................................................................. 2
Construction Methods. .............................................................. 2
Precautions.............................................................................. 2
Assembly Procedure................................................................. 2
INSTALLATION. ............................................................................ 2
Mounting.................................................................................. 2
Wiring. .................................................................................... 3
OPERATION. ................................................................................ 3
General.................................................................................... 3
Recording a Message. .............................................................. 3
Voice ID Operation. .................................................................. 4
Message Playback for Testing. .................................................. 4
Playback by DTMF Request. ..................................................... 4
ENHANCEMENTS. ........................................................................ 4
General.................................................................................... 4
Changing Tone......................................................................... 4
Addressing More Than One Message. ........................................ 4
Multiple Messages..................................................................... 5
Remote Control of Multiple Messages. ........................................ 5
THEORY OF OPERATION. ............................................................. 5
General.................................................................................... 5
Recording Technology. ............................................................. 6
Audio Recording Circuits. ......................................................... 6
Audio Playback Circuits. ........................................................... 6
U1 Control Circuits. .................................................................. 6
S2 Record Switch Circuit. ......................................................... 6
Q1 Playback Latch Circuit. ........................................................ 6
Remote Control Circuits. ........................................................... 7
Q2/Q3 ID Key Circuit. ............................................................... 7
Addressing............................................................................... 7
Power Distribution. ................................................................... 7
TROUBLESHOOTING. ................................................................... 7
General.................................................................................... 7
Digital Recorder U1. ................................................................. 7
Switching Transistors. ............................................................... 7
Power Supply Circuit. ............................................................... 8
PARTS LIST ................................................................................. 9
COMPONENT LOCATION DIAGRAM.............................................. 9
SCHEMATIC DIAGRAM............................................................... 10
