RE: JR Announces 2.4Ghz 12 channel & 9 channel radio. X9303 and 12X

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... - 4/18/2007 7:21:51 PM

^Horatio>

Posts: 300
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From: Pembrokeshire, UNITED KINGDOM
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Interesting stuff. I thought that lower frequency sound/radio waves required more energy to propagate the same distance as a higher frequency waves? I know that range is difficult to calculate for lots of different reasons (all well above my head, I'm no Physicist). Also, when you consider what might hinder one wave length may not necessarily effect another, it makes you think about the vast differences between FM/PCM and the new 2.4 gear.

For RC aero use, hopefully line of sight would never be an issue. We're flying RC models rather than UAV's so presumably our models are always within visual range. Even so, with a large/fast model aircraft though, this can be hundreds of meters away.

In the past there have always been factory recommendations for safe operational range, both for surface and aero models and furthermore, the information was always readily available.

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Post #: 201

RE: JR Announces 2.4Ghz 12 channel & 9 channel radi... - 4/18/2007 9:30:23 PM

Strykaas

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Joined: 3/21/2003
From: Paris, FRANCE
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quote:

JR will regret the 2 spot scheme

What do you mean ? Could you please explain ? Thx.

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Post #: 202

RE: JR Announces 2.4Ghz 12 channel & 9 channel radi... - 4/18/2007 9:37:32 PM

dick Hanson

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Joined: 12/12/2001
From: slc, UT, USA
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time for Henny Penny "the sky is falling"!
there are a few doomsayers who keep popping up with this same chant.
Now look carefully and sort out the results from the "other" systems being promoted.
Oh Oh - no other results !
never mind.

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Post #: 203

RE: JR Announces 2.4Ghz 12 channel & 9 channel radi... - 4/18/2007 10:55:22 PM

PlaneKrazee

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From: Westerly, RI, USA
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Good to know. I think they rated the video range at 1 mile but it's been several years since I bought it. Get the engine, battery, or other obstruction in between the tx and rx and you have zero transmission. I have a ham license and one is required to run 1 watt power. You can't run more than 200mw without a ham ticket in that band, unless something has changed.

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Post #: 204

RE: JR Announces 2.4Ghz 12 channel & 9 channel radi... - 4/19/2007 12:56:25 AM

Panzlflyer

Posts: 1940
Joined: 2/28/2002
From: Goldsboro, NC, USA
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The wireless box is being advertised for use with FS One flight sim and Spectrum DX system....think its on Spectrums page.

If a motor etc can trully block signals how come when I put a Spectrum reciever in a metal box with servos outside, close the lid, it still operates the servos from about 4ft away if theres zero transmission??????? Something doesnt add up or is this the usual suposition?

Oh and my 2.4 router is on as well as cordless phone and cell phone.

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Post #: 205

RE: JR Announces 2.4Ghz 12 channel & 9 channel radi... - 4/19/2007 2:43:35 AM

Silent-AV8R

Posts: 1782
Joined: 3/16/2004
From: SOCAL, CA, USA
Status: online

quote:

ORIGINAL: Panzlflyer

If a motor etc can trully block signals how come when I put a Spectrum reciever in a metal box with servos outside, close the lid, it still operates the servos from about 4ft away if theres zero transmission??????? Something doesnt add up or is this the usual suposition?

Oh and my 2.4 router is on as well as cordless phone and cell phone.

Just curious how the thickness of that box compares to my DA150. Thcker, or thinner??

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Post #: 206

RE: JR Announces 2.4Ghz 12 channel & 9 channel radi... - 4/19/2007 1:57:20 PM

Panzlflyer

Posts: 1940
Joined: 2/28/2002
From: Goldsboro, NC, USA
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okay, if your going to quibble about thickness, stand directly in front of my DA100 with the antenna in front of the spinner and the receiver behind the motor, batteries, CF wing tube and 32oz fuel tank and it works perfectly.

The statements on these threads are ridiculous......go out and try it, instead of coming up with Hammy guesswork and so called expert opinion.

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Post #: 207

RE: JR Announces 2.4Ghz 12 channel & 9 channel radi... - 4/19/2007 2:13:41 PM

VLAMGAT

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Joined: 8/8/2005
From: , SOUTH AFRICA
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Strykaas,
Just my opineon, have to admit to not having the complete picture in my head on JR implimentation of SS. If and when more tech details are available I may change my gut feel about their system. I really hope to since I really want the 12X channel system NOW! Dont like Futaba but I am sure its a good radio otherwise they would not have been in bussiness for as long as they have.
Fact is 2.4GHz SS is a leap forward but expect to see growing pains and increased confusion about the best install procedures for the rx and diversity antenna's, especially on jets. Also expect to get poor range on the ground compared to VHF. Benifit of 2.4 in our open space environment is very small mutipath nulls (them dead spots in certain spots on the field) This often translates into better range at lower altitudes far away, where VHF systems may experiece large nulls.

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Post #: 208

RE: JR Announces 2.4Ghz 12 channel & 9 channel radio... - 4/22/2007 4:34:05 PM

nickbooth

Posts: 56
Joined: 2/19/2003
From: Hitchin, UNITED KINGDOM
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Here's a question then. Say at a large field you are the only one with a Spektrum or JR unit, 4 others are flying also at the same time with Futaba FASST hardware and round the corner in the heli area are a couple of pilots hovering with there Futaba FASST gear. Mean while, as the peg board has been removed all other pilots have no longer to wait to perform their pre filight checks, they turn their Futaba gear on also ( I know this scenario is unlikely but million to one chances are normally odds on favourites to happen!!) you are now flying on your two channels and 9 other guys are constantly hopping channels every 2 milli secs. I would consider that there may be a chance of more than one other pilot jumping on and off your channels at very regular intervals.
At what point would your connectivity become so fragmented that control would be interrupted enough to affect your planes controls. Bare in mind that this little glitch would probably happen when you are running a 5 foot high rolling circuit around the field?

I know the above is unlikely but in a larger club there would be nothing stopping lots of flyers having their systems on without a thought for what affect it may have.

Also, to any english flyers that are reading this, but have read a UK Mag this month with a statement saying that using a transmitter from one manufacturer and a frequency module from another manufacturer will not only invalidate your hardware warranty, but also invalidate your BMFA insurance....great!!

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Post #: 209

RE: JR Announces 2.4Ghz 12 channel & 9 channel radi... - 4/22/2007 6:19:00 PM

bruce88123

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From: Memphis, TN, USA
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The freq pin board should remain as long IMO as ANYONE is flying non-2.4 gear.

And I don't feel that the occasional lost 2 msec from a lost signal will be critical. If you ever get to that point you simply have too many aircraft or other users in the area.

Do you seriously think the manufacturers haven't though through all of these scenarios> They don't want to go through lawsuits and recalls. Also the AMA and FCC have blessed these systems apparently.

Or is this another vast conspiracy?

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Post #: 210

RE: JR Announces 2.4Ghz 12 channel & 9 channel radi... - 4/22/2007 8:29:30 PM

pappy35

Posts: 364
Joined: 10/30/2006
From: Liberty Township, OH, USA
Status: offline

I think Nickbooth's question is valid. Likely? Probably not but thought problems like this spawn ideas and education. No conspiracies, just a valid question. I am also interested in how this scenario is handled.

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Post #: 211

RE: JR Announces 2.4Ghz 12 channel & 9 channel radi... - 4/22/2007 10:24:12 PM

nickbooth

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Joined: 2/19/2003
From: Hitchin, UNITED KINGDOM
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Not a conspiracy theory, just asking what I presume is a valid question based on my own thoughts about the two different systems and the information I have managed to hopefully digest and understand before I spend my money. As I said it is probably unlikely, but as for the two companies or three as it is now having discussed their different methods, well at this early stage would have meant giving the opposition details as to how they intend to attack an open market. I am sure Ford motor company doesn't ring GMC every time they discover a new way of manufacturing to make sure they are going the same route, infact we only have to look at Betamax and VHS, and now HD DVD and Blue Ray.

I just want to be sure that when I hand over my big wad of cash that it is for the right piece of hardware.... maybe its better the devil you know that the one you don't until further notice

Nick

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Post #: 212

RE: JR Announces 2.4Ghz 12 channel & 9 channel radi... - 4/23/2007 2:01:19 AM

Hammbone

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Joined: 1/5/2002
From: Fort Collins, CO, USA
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O.K., so if it does happen, you might get interference for 2 milli seconds. How are you even going to notice 2 milli seconds of interference? Your servos can't even react that fast.

Jim

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Post #: 213

RE: JR Announces 2.4Ghz 12 channel & 9 channel radi... - 4/23/2007 2:26:49 AM

bruce88123

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