RE: JR Announces 2.4Ghz 12 channel & 9 channel radio. X9303 and 12X  
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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> RE: JR Announces 2.4Ghz 12 channel & 9 channel radio. X9303 and 12X
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RE: JR Announces 2.4Ghz 12 channel & 9 channel radio. ... - 4/14/2007 5:51:31 PM   
bruce88123


 

Posts: 10537
Joined: 11/26/2004
From: Memphis, TN, USA
Status: offline
quote:

ORIGINAL: ELECTRONS

ONE OF OUR CLUB MEMBERS BOUGHT THE CHEAPER FUTABA AND AFTER ONLY TWO WEEKS CRASHED HIS PLANE BECAUSE HE SELECTED THE WRONG MODEL MEMORY.

Why are you blaming the radio for pilot error? That's stupid. Model match is a great feature but the guy knew he didn't have it.


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       Post #: 151

RE: JR Announces 2.4Ghz 12 channel & 9 channel rad... - 4/14/2007 5:55:28 PM   
bruce88123


 

Posts: 10537
Joined: 11/26/2004
From: Memphis, TN, USA
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quote:

ORIGINAL: ELECTRONS

FUTABA DOES NOT HAVE MODEL MATCH. IT IS POSSIBLE TO SELECT THE WRONG MODEL AND POSSIBLY CRASH AS DID HAPPEN TO A MEMBER OF MY CLUB. NO PRODUCT IS PERFECT. DO YOUR OWN RESEARCH AND FIND WHAT YOU WANT AND LIKE.

You can select the wrong model with the JR/Spectrum too. You just have a computer to help think for you because you turned your brain off. Should have stayed home if you're that asleep IMO.


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       Post #: 152

RE: JR Announces 2.4Ghz 12 channel & 9 channel radio. ... - 4/14/2007 6:13:31 PM   
bruce88123


 

Posts: 10537
Joined: 11/26/2004
From: Memphis, TN, USA
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quote:

ORIGINAL: Harleyflyer

I currently have a 9303 and plan on staying with JR for now. Just curious though, does anyone have any information or thoughts on the Spektrum/JR 2.4 technology versus the Futaba 2.4 technology? I didn't realize until just yesterday that Futaba uses only one receiver, does some sort of channel surfing, etc. I am just curious about the pros and cons of each technology. Maybe we will have to wait and see as it is so new....at least from the Futaba side.

Futaba uses what is called "Frequency Hopping" technology. They "hop" to a new freq every 2 mili-seconds (That's 500 times in the span of one second). This is similar to a technique the military uses for secure communications.
JR/Spektrum seeks out and locks onto 2 available frequencies and uses them.
Both have there good and bad points.
If the Spectrum gets a glitch on one of it's channels, it gets good data on the other.
If the Futaba gets bad data on it's sole channel, it's not on the bad frequency long enough for it to be of concern.

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       Post #: 153

RE: JR Announces 2.4Ghz 12 channel & 9 channel rad... - 4/14/2007 11:12:42 PM   
dalbert02



Posts: 11
Joined: 5/7/2004
From: Miami, FL, USA
Status: offline
quote:

ORIGINAL: ELECTRONS

TYPICAL 72 MHZ OUTPUT POWER IS 200 TO 250 MW. OVERALL TX POWER COMSUMPTION IS .5 W


Where did you get this from? I have measured power from various Tx modules and output power is generaly 500mW to 750mW. What Tx did you measure and what did you measure it with?

http://www.rcgroups.com/forums/showthread.php?t=587794

-dave
KI4HVT


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       Post #: 154

RE: JR Announces 2.4Ghz 12 channel & 9 channel radio. ... - 4/15/2007 2:00:31 AM   
gjhinshaw


 

Posts: 66
Joined: 12/31/2001
From: Lathrop, MO, USA
Status: online 		There is a slight lag between the add on mod to the true 2.4. Not much but you can tell its there.

(in reply to christopherc)
       Post #: 155

RE: JR Announces 2.4Ghz 12 channel & 9 channel radio.... - 4/15/2007 4:13:31 AM   
makatron


 

Posts: 272
Joined: 9/28/2006
From: Santo Domingo, DOMINICAN REPUBLIC
Status: offline 		i was wondering if i could electronically modify a 2.4ghz wifi signal booster to amplify the output of these new radios

an extra 400mw would be nice if helps you to avoid poor reception at the other end

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       Post #: 156

RE: JR Announces 2.4Ghz 12 channel & 9 channel rad... - 4/15/2007 4:51:22 AM   
starzak



Posts: 1739
Joined: 12/5/2001
From: Chacotoma, NM, USA
Status: online
quote:

ORIGINAL: bruce88123


quote:

ORIGINAL: ELECTRONS

FUTABA DOES NOT HAVE MODEL MATCH. IT IS POSSIBLE TO SELECT THE WRONG MODEL AND POSSIBLY CRASH AS DID HAPPEN TO A MEMBER OF MY CLUB. NO PRODUCT IS PERFECT. DO YOUR OWN RESEARCH AND FIND WHAT YOU WANT AND LIKE.

You can select the wrong model with the JR/Spectrum too. You just have a computer to help think for you because you turned your brain off. Should have stayed home if you're that asleep IMO.



I have absolutely no sympathy for a person who does not pre-flight check his controls before taxiing out. He deserves what he gets ! As Forrest Gump said - " Stupid is as stupid does. "

> Jim

(in reply to bruce88123)
       Post #: 157

RE: JR Announces 2.4Ghz 12 channel & 9 channel rad... - 4/15/2007 6:24:20 AM   
Rod Bender



Posts: 466
Joined: 1/22/2006
From: Swansboro, CA, USA
Status: offline 		[/quote]

I have absolutely no sympathy for a person who does not pre-flight check his controls before taxiing out. He deserves what he gets ! As Forrest Gump said - " Stupid is as stupid does. "

> Jim

[/quote]
I am going to 2nd that. In this sport\hobby you have to be or have a pretty clear head (If you fly worth a darn, and want to take your plane home at the end of the day) With todays automation and programming, a certain factor of old school pre flight safety is often overlooked, or taken lightly. I can't count how many planes I've seen become lawn darts over the past year because of the wrong model being used, OR the old one, the ailerons were reversed. Basic pre flight checks would\could\should prevent this. All the new age programming is not to be used as a replacement to the old rule of basic safety, common sense, and attention to detail. I am looking forward to the new JR x9303 this summer though.................Greg


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       Post #: 158

RE: JR Announces 2.4Ghz 12 channel & 9 channel rad... - 4/15/2007 6:42:48 AM   
sfsjkid



Posts: 576
Joined: 12/12/2003
From: fremont, CA, USA
Status: offline
quote:

ORIGINAL: GeeBeeJim


quote:

ORIGINAL: bruce88123


quote:

ORIGINAL: ELECTRONS

FUTABA DOES NOT HAVE MODEL MATCH. IT IS POSSIBLE TO SELECT THE WRONG MODEL AND POSSIBLY CRASH AS DID HAPPEN TO A MEMBER OF MY CLUB. NO PRODUCT IS PERFECT. DO YOUR OWN RESEARCH AND FIND WHAT YOU WANT AND LIKE.

You can select the wrong model with the JR/Spectrum too. You just have a computer to help think for you because you turned your brain off. Should have stayed home if you're that asleep IMO.



I have absolutely no sympathy for a person who does not pre-flight check his controls before taxiing out. He deserves what he gets ! As Forrest Gump said - " Stupid is as stupid does. "

> Jim



Jim, it was stupid but as I think Forest also said "ShXt Happens" and Murphy's Law also applies sometimes I'm getting close to 10,000 flights, out of the three times I've forgotten to check my surfaces on the taxiway, two have resulted in crashes. One of them being the one Electrons mentioned. I agree that no sympathy should be given nor am I asking for any. Fortunately the plane the quickly rolled into the ground.


< Message edited by sfsjkid -- 4/15/2007 6:43:21 AM >

(in reply to starzak)
       Post #: 159

RE: JR Announces 2.4Ghz 12 channel & 9 channel radio.... - 4/15/2007 2:30:41 PM   
ChuckA


 

Posts: 112
Joined: 8/31/2003
From: Tullahoma, TN, USA
Status: offline 		I never have to worry about flying with the wrong model selected because all controls move the same way no matter which model is selected. If I accidentally fly with the model selected, at worst the model will be out of trim and I will have a chance of landing the model without damage. Been doing this since I bought my first transmitter with servo reversing switches. Guess what made me start using a standard setup for all controls. About 1980 I think since I never had this problem with my Proline radios.

(in reply to sfsjkid)
       Post #: 160

RE: JR Announces 2.4Ghz 12 channel & 9 channel radio.... - 4/15/2007 6:12:34 PM   
sfsjkid



Posts: 576
Joined: 12/12/2003
From: fremont, CA, USA
Status: offline 		Hey ChuckA, that is a good idea. Sounds like sage advice resulting from your many years in RC and not having model memory in the Proline era. I might try implementing in some of my models. I say some because approximately half of my stable is set up with dual aileron, elevator servos for 3D, a couple are wing setups, one heli, and even a car (for use with the proper ground module of course). In this particular crash, while having the ailerons going the right way would have given me half a chance, the throws were such that I didn't have enough stick to counter the trims for the other model (3D w/dual aileron). The other crash I mentioned I was using a Zagi mix on a conventional model. Again, fortunately there were no moments endangering anyone, nor is any sympathy trying to be generated. I've been in the hobby long enough to modify Tom's Cruise's line from Days of Thunder, ie "Crashins' Flying".

Someone mentioned feeling bad about not recommending Spektrum to the newbies. Yes, Model Match would have saved me too, but a secondary feature IMHO given my numbers. Also, in all of those flights I mentioned, I've "only" been hit once, and 72mHz has been rock solid for me. There seems to be a QC issue at the very least, and at our field has a car track and sandwiched between office buildings, so it will be interesting how things will turn out in the long run. Also having a JR box means some problems finding a suitable buddy box at our field. This is the long winded version of saying, the resposible thing to do is not to recommend a specific system, but info the newbie about the various merits of different systems. I've always done this even before SS.

Now, this has gone way off topic, apologies. As you may have gathered, I'm a cautious adopter of new tech, I didn't use lipos until they "caught up" with safety technologies in other industries, for example. I'm excited about not having to worry about frequency control, but need to prove to myself it is reliable. However, I am enjoying all of these new products that are being introduced.

So any word on Hitec? (ohhps, off topic again )

(in reply to ChuckA)
       Post #: 161

RE: JR Announces 2.4Ghz 12 channel & 9 channel radio.... - 4/15/2007 6:57:58 PM   
^Horatio>



Posts: 300
Joined: 6/25/2005
From: Pembrokeshire, UNITED KINGDOM
Status: offline
quote:

ORIGINAL: makatron

i was wondering if i could electronically modify a 2.4ghz wifi signal booster to amplify the output of these new radios

an extra 400mw would be nice if helps you to avoid poor reception at the other end


Hahaha, now that would make a cool 'grey' import!

If the range is as good as certain people here claim, then I suppose there's nothing to worry about. The thing is, there still seems to be some confusion over the transmitting power of our conventional systems, let alone these new fangled things!!

I know that it requires much more energy to transmit low frequency sound (example - bass bins require larger amplifiers than tweeters) but how this translates to radio transmissions, I'm not too sure. So as people have suggested, perhaps the transmitted power for FM/PCM radios needs to be significantly higher to produce comparable range, seeing as they're shifting lower frequencies. So if there is an accepted theory and formulae for the question posed, perhaps some of the radio experts here would like to enlighten us - provided the rest of us agree not to start shouting 'geek' or whatever!

Then we could see the amount of power that the new 2.4 systems would need to be transmitting at to at least break even with our conventional radios. Perhaps by then, the actual output power of these new systems will be revealed. Until then, people should demand some answers before forking out their hard-earned money!

As for accidents - preflight checks are essential. I've seen people start their engines but forget to switch the radio on. Honest - it happens! I agree that no matter how clever systems get, humans should still make use of their senses to help prevent accidents. Safety first and all that. If clever gizmo's can help make things even safer, than all the merrier.

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RE: JR Announces 2.4Ghz 12 channel & 9 channel radio.... - 4/16/2007 2:23:16 AM   
2slow2matter


 

Posts: 2367
Joined: 8/25/2004
From: Springtown, TX, USA
Status: offline 		To answer a question from earlier--the spektrum and JR work as slave/master in any configuration. Hook them up as if they were both the same brand--either way. I've used them both interchangeably--DX7 and 7202.

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RE: JR Announces 2.4Ghz 12 channel & 9 channel radio.... - 4/16/2007 6:09:59 AM   
ss61


 

Posts: 6
Joined: 3/24/2002
From: Knox co. ILL
Status: offline 		I see a lot of comments as to the RANGE of the 2.4ghz radio systems. I would think that it would be suicide for the MFG's to even suggest what that might be. If they did, look out cause here comes the judge. That would open up all kind of lawsuits.

What they do say is that you must range check and do it just the way they say. In the case of the DX-7 they say to power up the transmitter and receiver. Then walk 30 steps, approx 90 feet, hold the bind button in on the back of the transmitter and then work the sticks to make certain that everything works according to the input you put in with the sticks. If everything works then go fly. If things don't work correctly, as you move the sticks, DON'T FLY! ! "I find that I get about twice what they say, as far as the range check goes." Well over 200 feet. Again you must get 90 feet, with bind button held in. All MFG. of RC radio systems explain the proper way of range testing their product. Follow their guidance and the range will be there, as far as distance goes.

(in reply to 2slow2matter)