Spektrum SPM1200 User Manual

Spektrum’s Digital Spectrum Modulation (DSM) system offers the ultimate in radio
link security. No longer do you have to worry about transmitters on your frequency
unintentionally being turned on, waiting for the frequency clip to practice or interference
caused from noisy motors, speed controllers or other interfering sources. The DSM system
utilizes Digital Spread Spectrum technology providing an impenetrable radio link.

Operating within the ultra high frequency 2.4GHz worldwide ISM band, each individual
module is programmed at the factory with its own unique serial code called GUID
(Globally Unique Identification code). Once a receiver is programmed to a specific module
(called binding), the receiver will only recognize that module, ignoring signals from any
other sources. And with over 4 billion possible GUID codes, it’s virtually impossible for a
receiver to listen to anything other than its bound transmitter.

The DSM system is telemetry-ready for optional telemetry modules (purchased separately).
Engine temperature, speed, rpm, signal strength, battery voltage and even lap times are
displayed in real time via Spektrum’s handheld display or via a PC. Telemetry options will
be updated periodically to include a wide variety of popular functions.

Introduction

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• Eliminates the possibility of interference from an unintentional turn-on

• Impervious to model-generated RF interference (like noisy motors, speed controllers,
metal-to-metal noise, etc.)

• Robust interference from any outside sources like other transmitters, cell phones,
pagers, WiFi systems, etc.

• No more waiting for an open frequency

• Eliminates the need for a frequency board and frequency clips

• Fail-safe drives the servos to a preset position (usually full brakes) in the unlikely
event of signal loss

• No need to impound transmitters at events

• The DSM system is available for all popular module-based 3-channel transmitters

• 2.4GHz worldwide band allows international use

• Short 8.5" receiver antenna is easy to mount

• Telemetry-ready— optional modules allow real time monitoring of head temperature, rpm,
speed, battery voltage, lap times, etc.

• No maintenance or tuning required (always stays in tune)

• No need for crystals

• Up to 79 users can simultaneously operate DSM systems with no interference

• FCC, UKCC, ROAR, NORCCA and ETSI approved

Benefits

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The DSM system operates in the 2.4GHz band (that’s 2400MHz). This high frequency
offers a significant advantage as it’s well out of the range of model-generated radio
interference (like motor and ESC noise). All the complex issues that now exist using 27
and 75MHz radios with model-generated interfering noise are eliminated with this system.
The DSM system uses Direct Sequence Spread Spectrum modulation to generate a
wide signal on a single frequency. The FCC requires that these systems be “smart”–
incorporating collision avoidance such that when a system is turned on, it scans the

2.4GHz band and selects a channel that is not being used, then begins transmitting on

that unused channel. 79 channels are available and the odds of one DSS spread spectrum
system interfering with another are astronomically remote. The 2.4GHz spectrum has a
capacity of 79 channels. In the unlikely event that the spectrum is full, the 80th system will
not connect or cause any interference, going into hold scan until a channel is free.

DSM

Digital Spread

Spectrum

Modulation

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During first installation, the receiver(s) must be bound to the transmitter module. Binding
is necessary to program the receiver(s) to distinguish its corresponding transmitter from
others. Also fail-safe positions are transferred from the transmitter to the receiver during
binding. See binding below for more details.

1. Make sure that the transmitter is switched off.

2. Remove the
current RF
module from
the transmitter.

3. Carefully insert
the DSM module
noting the
orientation of the
connector pins.

Installation

Instructions

Installing the Transmitter

Module

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