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Losi Tuning Guide

 

Sent: Wednesday, 23 March 2005
To: Brenton Wildman
Subject:
Re: spare engine parts for LST

dear mr brenton wildman

i have ordered two head inserts for the lst.many thanks.i look forward to dealing with you again.you have provided an excellant service.so much better than here in the uk.no one over can get parts for the lst as quick as you can and your the other side of the world.i ordered some shock shafts off you back in november last year and they arrived 10 days later.i ordered the same part with a company over here at the same time and they still have not arrived.what a wonderful service.many thanks again

steven maddock.

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Spektrum DSM what is it?

AM, FM, PCM and now DSM. Spektrum’s newly released DSM (Digital Spectrum Modulation) system advances RC radio technology to the next generation. Based on an optimized version of Direct Sequencing Spread Spectrum, DSM offers pure digital control providing an impenetrable radio link that’s immune to all types of interference. And with 4096 bit resolution and 5.6ms response time, the DSM system offers seemingly infinite accuracy and instantaneous response for a totally connected driving experience.

WORLD’S MOST SECURE RADIO LINKS

For the highest security levels of radio communications, NASA, the U.S. military and government agencies like the CIA and FBI rely on Spread Spectrum technology. Whether guiding unmanned reconnaissance aircraft over enemy territory, controlling satellites in space or communicating critical mission orders to the battlefield, the impenetrable secure link that Spread Spectrum coding provides makes it ideal for these decisive security applications.

And now Spektrum offers this technology for your RC car’s radio system.

SPEKTRUM'S DSM TECHNOLOGY

In development for over four years, Paul Beard, a leading engineer in the Spread Spectrum industry, designed Spektrum’s DSM system. The DSM system utilizes Direct Sequencing Spread Spectrum technology that has been optimized for RC car use. Unlike current narrow band 27 and 75MHz systems, Direct Sequencing Spread Spectrum or DSSS generates a wide signal on a single frequency, and information is encoded with its own Globally Unique Identification number (called GUID) such that the receiver only recognizes the information from its specific transmitter. And with over 4.2 billion available GUID codes, it is virtually impossible for a receiver to be controlled by anything other than its mating transmitter. Spektrum calls this optimized form of modulation DSM–Digital Spectrum Modulation.

FHSS VS. DSSS

There are two primary types of Spread Spectrum technology— Frequency Hopping (FHSS) and Direct Sequencing (DSSS). FHSS systems transmit a narrow band signal and rapidly jump from one frequency to the next spending a few milliseconds on each frequency. DSSS systems transmit on a single selected frequency but on a very wide band. Only a small portion of that band is used for specially encoded information. Originally, Spektrum engineers started their development with FHSS-based systems because they were relatively easy and inexpensive to develop. However, it was soon discovered that FHSS had several limitations that would prevent it from being the optimal solution for RC.

While more difficult and costly to develop, our engineers began experimenting with Direct Sequencing Spread Spectrum and optimized the modulation scheme to overcome critical response and re-link issues. In addition, DSSS offered 18dB increase of processing gain for significant improvements in range. With years of development and testing the DSSS modulation scheme was optimized for RC car use and Spektrum’s DSM system was born.

Each DSM System includes a transmitter module and 3-channel receiver. Four versions of the system are available for use with JR, KO, Futaba/Hitec or Airtronics 3-channel systems that use transmitter modules. Compatible systems include:

  • JR R-1, R-1 Pro, and 756

  • Airtronics M-8

  • KO Propo EX-10 Helios and Mars

  • Futaba 3PK and 3PJ

  • Hitec Aggressor CRX, Lynx, and SRX

No crystals or special tuning is required. Just buy the DSM System for your make of radio, replace the stock transmitter module with the DSM module and install the DSM receiver. All that's left to do is spend a few seconds "binding" the receiver to the module and you're ready to go.

It's that easy.

DSM System Specifications

Frequency Band

2.400-2.4835 GHz

Channels

79

Channel Spacing

1 MHz

Range

3000 ft

Latency

5.6 ms

Resolution/Channel

4096 steps

DSM Transceiver Specifications

Weight

.40 oz./ 11.3 grams

Dimensions (LxWxH)

1.62x 1.06x.57"/ 41.2x 27.0x 15.3mm

Input Voltage

3.2- 9.6V

RC Channels

3

Current

40 mA @ 4.8V

Antenna length

8.5 in

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