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HomeRC & PowerAircraftHelicopterRadio - JR DMSS › JR R921 RX reboot
02-07-2008 01:25 PM  10 years agoPost 1
George Matthews

rrElite Veteran

N.W. Ohio

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Has anybody here heard that JR has reprogamed the R921 2.4 RX to reboot faster than the spektrum RX's in the event of the low voltage problem?

02-07-2008 02:11 PM  10 years agoPost 2

rrKey Veteran


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According to the DX6i manual all Rxes made since July 2007 have quick reconnect. Horizon/Spektrum is saying that it is more like the past month or so.

And it doesn't make the reboot faster, it stores the last used channels for 15 second so that the Rx can find the Tx faster.

Supposedly any Rxes that warn of low voltage by flashing the LEDS has the quick connect, but my testing of my Rxes shows that all of them (all bought since late Oct 07) reconent almost instantly in most cases.

To test, just power up the Tx and Rx. Remove power for the Rx for a second and reconnect. If ht eLEDS starts flashing and stay flashing, it is the newest firmware. Like I said, even without that, it may still reconnect quickly.

Blade CP Trex 450 SE
QJ EP8v2 EX Gaui Hurricane 550
Vibe 50 Bergen Intrepid Gasser

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02-12-2008 11:13 PM  10 years agoPost 3


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How long is the time to reboot when the signal from transmitter is lost?
I have made a range test (ar6100e) with pushed bind button and lost signal at around 20 meters.
I then released the bind button and it takes 2 - 11 seconds to get the control back!!

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02-13-2008 11:10 AM  10 years agoPost 4


Boden, Sweden

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Karlheinz--> This issue inst at all the same as reboot of Rx.

Ive only discussed the fast reconnect on a forum, one guy did send his AR7000 for mod and he say they reconnect immedietly.He couldnt se any delay at al if he power off and then on.
So, if he´s right the new 'fast connect' is really good.

If you use the bind button the Tx lowers the output, and when you release the button power increases again. I dont know how fast the Tx is at going back to normal power.
For me the Rx starts responding as soon as I turn the Tx in a better angle(making the signal better). I dont remember any delay when releasing the bind button.

Anyway, the fast reconnect is only when the rx is powered off and on within 15s(or a power supply glitch).

The time for the Rx to start to respond to the Tx after a signal loss (hold) is very low, accordning to Spektrum...dont remember but its sad to be only some hundreds of a second.

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02-14-2008 06:55 PM  10 years agoPost 5


Rochester MI

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In my testing of a v1.2 AR6100, it takes between 500mS and about four seconds to reconnect depending on the amount of time the RF was lost with transmitter and receiver both continuously powered.

I also looked at the RF output of the DX7 (and a Spektrum equipped Futaba 9C) and the RF comes back up essentially instantaneously after the bind button is released.


Paul Goelz
Rochester MI USA

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