Specifications

Company Confidential 61 Raveon Technologies Corp.
17. Use with External Radio
17.1. Overview
The model RV-M5-X is an OEM version of the FireLine modem which does not
contain an internal radio.
17.2. Radio Requirements
The radio used with the RV-M5-X modem must be capable of:
A) Flat transmit modulation.
The frequency response of the the transmit audio
must be DC to at least 2.5kHz (for 4800baud) or DC to 4.8kHz (for 9600
baud).
B) Flat receive audio.
The audio output must have a flat frequency response.
Often this is called “Discriminator Output”. Speaker output or any receive
audio source that is de-emphasized will not work. The receive audio must be
flat from DC to at least 2.5kHz (for 4800baud) or DC to 4.8kHz (for 9600
baud).
C) Fast PLL.
The TX attack time of the transmitter must be 10mS or less. If the
transmitter transmit attack time is slower than 10mS, then additional preamble
bytes should be sent to accommodate for the slow rise time. The ATR5
command sets the number of transmit pre-amble bytes.
On the rear panel of the RV-M5-X is a 15 pin D-sub female connector, intended
for connection to an external radio. The following table describes the functions of
the various pins.
17.3. Radio Interface Connector Pin-Out
Front view of 15 D female Radio Interface Connector
Pin
Number Function Notes
1
Ground
Ground connection
2
8V DC Out
8V DC output. 2A max at 10% duty, 1A max at 25% duty,
250mA max continuous.
3
TX ON
Active high. 0V when off or in RX mode. 5V in TX mode.
4
RX ON
Active high. 0V when off or in TX mode. 5V in RX mode.
5
Radio ON.
Active high. 0V when external radio should be off. 5V when
external radio should be on.
6
TX Mod
Wide-band modulation to the transmitter. Must be DC coupled,
flat 0-4800Hz frequency response. 1V p-p nominal for full
deviation.
7
No Connect