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JR 9303 Throttle Cut?

Bay Heli

Heliman

Bay Area, CA

I am a newbie to RC radio. I brought a JR9303 for my Rappy. My friend is using Futabu 9C. He has throttle hold and throttle cut switches. I went through my JR manuel, and I could not find the throttle cut (engine kill) function. Currently, I am using throttle hold to kill the engine, and I know this is not the right way. Please tell me how to program/ assign another switch to be the throttle cut switch instead of using the throttle hold.

Thanks

Raymond

12-10-2004 Over year old.
mrNoodles

rrProfessor

Borlänge, Sweden

Raymond
Im using a JR 9X, and I had to activate throttle cut in the 'THRO TRIM' menu. Its the last menu on my 9X. Might be worth checking out.

12-10-2004 Over year old.
HOMEPAGE  
Dyehard

Veteran

Cedar Bluff, Va.

Not having a built in throttle cut is part of the price you pay for having a mechanical throttle trim. You should be able to use one of your multipoint programable mixes to make a throttle to throttle mix that offsets engine idle enough to kill your engine. The mix should have a curve that only allows offset to come in at about twenty percent of throttle or less, that way you can't kill the engine unless you are close to idle. If possible, only have the mix active in normal mode, then you can't ever accidently kill the while in, say, an inverted climbout. That mix can then be assigned to whatever switch that is convenient for you.

12-10-2004 Over year old.
EVO Newbie

Heliman

Southampton, MA

Bay Heli:

I just bought the 9303 and had a number of issues with this radio having used Hi-Tec and Futaba gear in the past...

I called JR today... and got no help whatsoever from them...

There is no Throttle Lock function... The Throttle Hold function can be used as a Throttle Cut... or you could trim your throttle so that at bottom stick and full low trim your engine will quit... That's what I am going to test tomorrow.

The 9303 is Positive Frequency Shift so if you have any futaba or Hi-Tec RXs, they may not work, since both are Negative Frequency Shift RXs... Hi-Tec does make some Positive Shift JR/Airtronics compatible RXs though.

Also, if you didn't notice already, JR uses different channel assignments than Hi-Tec and Futaba... so you have to plug yoru servos into different channels on the Rx...

FYI... Great radio... sorely lacking in safety and convenience! PM me if you want to commizzerate...

Jon Frost

12-10-2004 Over year old.
mrNoodles

rrProfessor

Borlänge, Sweden

I havent heard of any radio that has anything called throttle lock, except the Eclipse?!

Throttle hold works the same way, throttle cut is used on radios with digital throttle trim and the 9303 comes with analog trim right?!

Just pull the trim to kill the engine, simple as that

12-10-2004 Over year old.
HOMEPAGE  
TMoore

rrMaster

Cookeville, TN

Since time immemorial this is how we have done it.

The throttle trim is set to kill then engine on standard trim radios, i.e., radio with trim levers that displace like the ones on the Stylus and the throttle of the JR radios. On push trim radios like the 9Z, 9C, RD6000 and 8000 there is a throttle cut switch typically. If you need to kill the engine make sure that your throttle cut or low trim setting will do the trick.

If you want to freeze your throttle so that something inadvertant can't happen, simply set the throttle hold switch for a reliable idle, start and carry the machine to the flightline. On the Airtronics radios the throttle hold function can be set to by your TH trim setting or you can manually set it in the radio.
The 9303 is Positive Frequency Shift so if you have any futaba or Hi-Tec RXs, they may not work, since both are Negative Frequency Shift RXs... Hi-Tec does make some Positive Shift JR/Airtronics compatible RXs though.

Also, if you didn't notice already, JR uses different channel assignments than Hi-Tec and Futaba... so you have to plug yoru servos into different channels on the Rx...

FYI... Great radio... sorely lacking in safety and convenience!
JR and Airtronics use the same frequency shift. Futaba is inverted. No manufacturers PCM encoding is compatible accross the brands. Channel assignments are arbitrary between the manufacturers, that means that the RX port assignments will vary.

IMHO, safety is in the hands of the user. This is an inherently risky hobby, with whirling blades, hot mufflers, fuel that burns and battery packs that can torch your house if you make an error in charging them, frankly the only thing that can make the difference is the care of the user. As you may have noticed, Hitec isn't exactly a major player in the Helicopter arena. They haven't really figured this part of the hobby out. Now that they own Multiplex this may change but Multiplex aren't big players either.

TM

12-10-2004 Over year old.
HOMEPAGE  
EVO Newbie

Heliman

Southampton, MA

(IMHO, safety is in the hands of the user. This is an inherently risky hobby, with whirling blades, hot mufflers, fuel that burns and battery packs that can torch your house if you make an error in charging them, frankly the only thing that can make the difference is the care of the user.)

Ditto... Ditto... Ditto....

JR makes no mention of the Frequency Shift of their products... you have to find that out from a third party source...

Seems like some standardization among manufacturers would be nice... so a novice or expert can go into the hobby shop and purchase a radio system and a plane or helicopter... Follow the instructions and with some 1 on 1 instruction... get into the air... without pulling out their hair...

I love my Hi-Tec Eclipse 7.... It works for both planks and helis.... It has a Throttle Lock button, Throttle Cut Button.... Works with Negative or Positive shift Rx...(PPM/FM Mode of course) If it had 9 channels, I wouldn't have bought the 9303...

As it is... the 9303 has cost me $725 for the Radio/Servo Set... $330 for two additional R649 Rx for my other two helis...., $21.00 for the DSC cord with shipping.... I don't complain about the $$$, I'm sure I will enjoy using such a fine piece of R/C equipment ... I just wish JR was more forthcoming with techical spec info on their website, in their advertisements, etc.... I could have made a more informed decision...

Further, the JR tech rep I spoke with this afternoon was abrupt and hung up on me...

Ihave set up my 9303 as you suggested this morning and will test the setup tomorrow when the weather clears...

Jon

12-10-2004 Over year old.
mrNoodles

rrProfessor

Borlänge, Sweden

I believe you can use other RX brands than JR when using PPM mode.
I can do it with my JR running on 35Mhz.

12-10-2004 Over year old.
HOMEPAGE  
EVO Newbie

Heliman

Southampton, MA

Futaba is negative shift in PPM/FM mode and doesn't work... I found that out today with my Avistar when I went to program it into the 9303... Nothing worked... however I did have a Hi-Tec 8 Ch. Slimline JR/AIR Dual Conversion Rx and that seems to work... so will try it at the field tomorrow...

Jon

12-10-2004 Over year old.
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JR 9303 Throttle Cut?

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