User's Manual

Introduction
Crescendo VHF Half-Duplex User Manual Page 6 of 74
1. Introduction
Crescendo is a series of data-driven and packet-driven radio modems for high-speed data applications.
This manual is specific to Crescendo VHF Half-Duplex. Some of the relevant features of this model include:
 Full VHF band switching (148-174 MHz)
 5W (+37 dBm) maximum transmit power
 Wideband or narrowband channels, with software
selectable frequency raster
 Raw air rate 19.2 Kbit/s (wideband) or 9.6 Kbit/s
(narrowband)
 Half-duplex data-driven or packet-driven operation with
Automatic Repeat Request (ARQ)
 Windows GUI for configuration and diagnostics
(Cruise Control)
 Internal configuration menu with diagnostic and statistical
information
 LED front panel user interface
 Two RS-232 serial ports (main and auxiliary)
 Operating voltage 9 to 16 VDC
Type Approvals:
 AS-4295
 FCC
 Industry Canada
Channels
Channel width (Channel spacing)
Occupied
bandwidth
AS-4295, FCC
Industry Canada
Narrowband
12.5 kHz
15 kHz
7.6 kHz
Wideband
25 kHz
30 kHz
9.7 kHz
Table 1: Channel width and type approvals