DMSS Frequently Asked Questions (Last Updated - 06/10/2011)
What is DMSS?
Dual Modulation Spectrum System is JR’s own 2.4GHz protocol. Although a late entry to the 2.4 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 2.4 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.
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.
However, 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 probably the world’s best quality radio control systems.
How can I get 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.
There are currrently two Txs in the XG series, the XG7 7-channel system & XG8 8-channel system supplied with an RG831 receiver complete with an embedded Receiver Voltage sensor.
If I already own a MacGregor/JR 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 ‘Modeller Support’ pages of our website. However we do believe it will be possible to update the DSX11 and 11X to DMSS but at this time we do not have any time scales or costs.
Will I be able to use DSM2 receivers with my MacGregor/JR DMSS transmitter?
No. JR DMSS is a completely new 2.4 protocol and so DMSS transmitters will not work with earlier 2.4 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:
Upgrade of JR DSM2 transmitters to DSMX >>
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