Review: The JR DSMJ FHSS 2.4GHz RC module and receiver.

Only available from outlets outside of the USA, the JR DSMJ frequency-hopping 2.4GHz module and receivers are an alternative to the more common DSM2 system.

In this review, I look at DSMJ and how it compares to DSM2.

I also see how it performs when subjected to significant levels of interference.

The bottom line: it appears to be significantly more resilient than DSMJ but it is more expensive and lacks some features such as ModelMatch.

This was JR's first FHSS product and it will almost certainly be replaced by their new DMSS system which also includes telemetry. Watch for a review on that soon.

For more information, visit the web-based review at: http://www.rcmodelreviews.com/dsmjreview.shtml

Category:

Science & Technology

Tags:

• RC
• model
• plane
• JR
• Spektrum
• DSM2
• DSMJ
• review
• DMSS
• 2.4GHz
• spread-spectrum
• FHSS

[Mark1Spitfire]

What if frequency hopping video tx arrives? Would fhss struggle?

[RCModelReviews]

@Mark1Spitfire I doubt we'll see any affordable FHSS video transmitters any time soon and even then, it would be much better to use a video transmitter on a different band such as 900MHz or 5.8GHz. The FPV feature I'm writing right now will show you how to set up a video system on an FPV model so as to avoid interference with the RC equipment.

[iwirebr]

How does it compare to the FrSky?

I hope the FrSky w/ telemetry is a better chance than the JR's, just got one out of TradeMe :)

[RCModelReviews]

@iwirebr The FrSky system is reviewed on the RCModelReviews website and was joint-winner of the RCModelReviews 2.4GHz shootout. I was pleasantly surprised at how well the DSMJ system compared, except on brownout performance where it was on a par with DSM2 (ie: quite a bit higher than most of the Chinese 2.4GHz or Futaba's FASST). However, if you have a good power system in your model, brownouts shouldn't happen anyway.

[theMw2Pr0]

nice vid you should sell me a helicopter

[RCModelReviews]

@theMw2Pr0 That's someone else's job. I don't sell RC products -- I only test and review them.

[Truebajan]

Great vid. Clear concise and informative. I am trying to encourage people to look more at the science and compare things on that level, than fanboy or forums. I am now going to subscribe to your channel and look for the dmss vid if there. Is it a video plug in wireless scanner? Though i like the jr module ad i have the propo 9xII I just don't like fact you don't get telemetry without the onboard box :(

[entomophile]

What are you using for your spectrum analyzer? It looks to be PC based.

[AussieJarred]

you definitely know your stuff, thanks for that!

[1521joe]

@RCModelReviews

brownout?

definition please.

many thanks

[1521joe]

hi

intresting review.thankyou

will technology like the dsmj be applied to surface transmitters for rc cars.

i noticed some of the high end tx like the ko propo ex10 euros are using the DDS and DSM2, the DsmJ or the latest dsmm is obviously a better signal for flying.

how relevant are those high end signal for surface tx/ cars and are the dsm2 or dds systems good for thier intended purpose / surface models.

Sincere thanks

[philstartdotcom]

The latest XG7 from Jr with DMSS is now the best buy.... just review that one soon. (i just bought mine here in Manila)

[marhar2]

These in-depth technical reviews are great. Could you consider doing a tutorial on how to use a spectroscope and spectrum analyzer?

[TheRealUberSteve]

How would you rate this compared to Hitec's AFHSS system? I take it DSMJ isn't adaptive? Also, were you still planning on doing an Aurora9 review?

[nick2008bhs]

I love the segments w/ the spectrum analyzer. They are very informative