User guide

SATELLINE-3AS NMS / NMS Epic / NMS 869 / VHF

User Guide, Version 1.0

RF INTERFACE

SATELLINE-3AS(d) NMS / NMS Epic / NMS 869 / VHF have a single TNC type connector with

impedance of 50 .

SATELLINE-3AS(d) NMS Epic has two antenna connectors, the one

on the left for both transmitting and receiving and the other on the

right for receiving only (the diversity reception); see the picture on

the right.

The diversity reception i.e. the secondary receiver of the Epic can

be switched off (in single antenna applications) by changing the

setting

Diversity Mode

OFF in the configuration. It is

recommended to protect the unused antenna port by placing a

suitable cap on the TNC connector.

Picture 6.1.

3AS(d) NMS Epic

When ordering the radio modem, the frequency band (or the center frequency) to which the

radio modem will be tuned to must be defined. The user can change the radio modem

operating frequency afterwards by ±1 MHz from the preset centre frequency (basic tuning

range), or inside 2 X 2 MHz frequency bands, when using the special Dual Band variant

assembly. SATELLINE-3AS VHF allows the user to change the operating frequency within whole

radio board limits (138 … 160 MHz or 155 … 174 MHz).

All local regulations set forth by the authorities must be taken into account. The 3AS NMS 869

uses ten 25 kHz channels in European licence free 869 MHz frequency band.

The radio channel spacing is set at the factory and cannot be changed afterwards by modifying

system settings. The data speed of the radio interface depends on the radio channel spacing as

follows:

• 25 kHz channel -> 19200 bps

• 12.5/20 kHz channel -> 9600 bps

The data speed of the radio interface depends only on the channel spacing - it is irrespective of

the data speed of the serial interface. If the data speeds of the radio interface and the serial

interface differ from each other, the radio modem will buffer the data, when necessary, so no

data loss will occur.

NOTE!

Adjusting the active radio channel to another frequency than allocated and/or allowed by

local authorities, is strictly forbidden.

Use or intended use of forbidden frequencies may lead to prosecution and penalties.

SATEL Oy is not responsible for any illegal use practiced with any devices manufactured

and/or sold by SATEL Oy and is not liable to pay any damages or compensation caused by

such illegal use.

TX&RX

RX only

Epic