What is JR DMSS?

What is JR DMSS?

Dual Modulation Spectrum System is JR’s own 2.4GHz protocol. A later entrant into the 2.4GHz market, DMSS can be considered as the truly ‘state of the art’ method of providing radio control for model use. And since JR have not rushed their own 2.4GHz protocol into production they have been able to incorporate the very latest techniques for ‘Wideband Data Transmission’ into the next generation of JR radio control sets.

DMSS combines the best features of Frequency Hopping Spread Spectrum (FHSS) and Direct Sequence Spread Spectrum (DSSS) protocols. FHSS is great for avoiding interference and DSSS offers high response. JR DMSS combines both these attributes, having both frequency hopping and high response.

The JR DMSS system uses a greater than 3Mhz wide signal as compared to the majority of others which utilise a much narrower [1Mhz or less] signal.

If we know anything about spread spectrum signals, a wider base signal [3Mhz Vs 1Mhz] allows for a huge increase in noise and interference immunity performance and at the same time allowing for much faster data bandwidth/throughput.

The fact that DMSS is actually using quite a wide bandwidth signal is a huge advantage in 2.4GHz performance and it will provide superior performance over any other current 2.4GHz system that is currently available.

DMSS also offers ‘Two-Way Communication’ (telemetry) with receiver voltage monitoring as standard. Other types of sensor are due soon, with Temperature and RPM sensors being the next types to become available from JR in late June.

Probably the most important thing about JR DMSS is that it is 100% pure JR, with no involvement from any other outside company. This means that JR are back in full control of product development, so they can now concentrate on doing what they do best – making what are arguably the world’s best quality radio control systems.

How can I get JR DMSS?
DMSS is being built into the next generation of JR radio control sets. DMSS sets can be differentiated from earlier JR 2.4 sets by looking for the XG series nomenclature.

The first XG series radio to Australia will be the XG8 eight-channel system, which is supplied with an RG831 receiver, complete with an embedded Receiver Voltage sensor and the combined satellite receiver/telemetry module RA01T.

The XG8 has passed MAAA testing and is due for release in Australia on June 15th, 2011. Later in the year we expect the radio line-up to extend with a pleasing blend of conventional JR transmitter case design with modern design touches. When picked up and compared with current eight channel sets we think you really will ‘feel the difference’!

If I already own a JR modular transmitter, can I update it to DMSS?
At the time of writing we are still waiting for JR’s instructions on how to deal with requests for DMSS updates. We will post any new information on this topic in the Support pages of our website

Will I be able to use DSM2 receivers with my JR DMSS transmitter?

No. JR DMSS is a completely new 2.4GHz protocol with the combined better features from FHSS and DSSS. DMSS transmitters will not work with earlier 2.4GHz receivers from either JR or other manufacturers.

OK, so now I’m up to speed with JR DMSS. But I’ve heard there is a new version of the earlier DSM2 system that JR previously used. Can you tell me more?
JR’s first 2.4 systems used the DSM2 protocol on licence from Horizon Hobby. DSM2 has recently been updated to DSMX. You can read more about this topic here.

The brand new eight-channel XG8 DMSS radio will be released in Australia on June 15th.