Jenn-Air 1300, 1892 manual Introduction

1INTRODUCTION

This document describes the operation of the Wood and Douglas Hermes Radio Modem.

The Hermes modems provide a transparent data link for a wide range of applications. The internal modem can be used with a range of Wood & Douglas RF products to give great choice in the operating frequency and transmit power. Two enclosure types are available to suit different applications.

The Hermes uses 4-Level Frequency Shift Keying (FSK) technology to achieve a RF link data rate of 19,200 baud in a 25kHz channel spacing and 9,600 baud in a 12.5kHz channel spacing.

One of the radio transceivers (the G-Max family) used inside the Hermes is designed for harsh environments and operates over a wide temperature range and a high vibration environment.

The standard Hermes is fitted with the SXn50 range of transceivers. This family has products at VHF, UHF and 868MHz, with a maximum transmit power of 500mW.

Hermes Operator Note Page 4 of 32