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Radio - JR & Spektrum DSM > Spektrum or 9x?

talk the torque
Senior Heliman
Location: SA

Hi guys

In the market for a new radio and want to purchase soon.

I need information on the new 7channel JR Spektrum radio. Is this radio safer than conventional radios for lock out. Please tell me any pros and cons of this new technology.

The other radio that I'm looking at is the JR 9x II Synthesized module. They also come with dual conversion receiver. How much of benefit is the dual conversion receivers over the single conversion receivers.

Which would be the best for AP work and least likely to get interference

Jason

01-11-2007 Over year old.

sharam
Elite Veteran
Location: Northern California

IMO, DX7. The greatest benefit is being as sure as one can be, that no one will by mistake turn on their transmitter on your channel, and shoot you down.

01-11-2007 Over year old.

Eury
rrProfessor
Location: Ankeny, IA, USA.

I wouldn't be thinking about any radio other than a Spektrum. No shootdowns, no glitches, no frequency pins, no worries. The response is faster than anything but a 14mz/12mz as well. Plus, the price is good.

Nick Crego
Still wanted by the government, I survive as a soldier of fortune.

01-11-2007 Over year old.

hrosee
Senior Heliman
Location: Richardson, Texas

DX7 all the way!

I have 3 Heli's and 7 planes flying on mine.

01-12-2007 Over year old.

HOMEPAGE

talk the torque
Senior Heliman
Location: SA

Hey guys

Now I'm getting told that it will interfere with my 2.4Ghz downlink? Please give me some advice

Jason

01-12-2007 Over year old.

Rob_T
Elite Veteran
Location: Tualatin, OR - USA

Quote
Now I'm getting told that it will interfere with my 2.4Ghz downlink?

I seem to remember some discussion of that over on RC Groups, and I think the conclusion was that it does interfere. I certainly would not use Spektrum to control a model with a 2.4GHz down link. I have used a 900MHz downlink with my Spektrum without problem, so that's another option.

Rob
Eco8, Piccolo Fun, Shogun, HB Elite CP, Trex 450XL CDE, Swift

01-12-2007 Over year old.

tauscnc
Veteran
Location: IL : www.cuttingedgecnc.c om

I will also chime in,, have the 9303.... GET THE DX7; its features out weight some of the benefits of the 9x

taus

01-12-2007 Over year old.

HOMEPAGE

firefox
Senior Heliman
Location: Thailand

Or... wait for a better Spectrum radio with more channels. I'm guessing that since the DX7 is based on the JR 7-channel radio (practically the same radio on the outside) a 9-channel version should likely look like the 9x. Why compromise?

I think the DX7 is a step in the right direction. It's just not there yet. The feature set just isn't enough for many of us, just like the feature set of the JR 7-channel radio doesn't cut it while the 9x does. I use the Futaba 9 Super, and I'd sorely miss a lot of the extra features it has (programs for gyro, governer, triple switch, better screen, etc) if I switched to the DX7 (which I can't actually buy... it's not sold in Thailand and practically unheard of).

01-12-2007 Over year old.

talk the torque
Senior Heliman
Location: SA

Thanx guys for your input

Sounds like the spektrum technology is here to stay. Just to many stories from the AP forum that it interferes with the video down link which is also 2.4Ghz so I decided to go with the 9x for now and I will look at the DX7 or maybe the "DX9" later

Jason

01-12-2007 Over year old.

tauscnc
Veteran
Location: IL : www.cuttingedgecnc.c om

Quote
The feature set just isn't enough for many of us

Acutally, its just enough for mostly all of us. For most helis you don't need more than 7 channels and it has 3 flight modes, DR, ATV, gyro feature, Hold, etc. One of the beat features is the model match. We are all just spoiled with the fancy switches and shiny parts

My 9303 looks so good but the DX7 can't be beat. I agree, when the DX9 comes out, its all over with the radio war

taus

01-12-2007 Over year old.

HOMEPAGE

tauscnc
Veteran
Location: IL : www.cuttingedgecnc.c om

Quote
Just to many stories from the AP forum that it interferes with the video down link which is also 2.4Ghz

How does this not effect the radio also? There is 2.4ghz wireless everywhere.

taus

01-12-2007 Over year old.

HOMEPAGE

Rob_T
Elite Veteran
Location: Tualatin, OR - USA

Spektrum seems to work fine with other 2.4GHz signals in the general environment- I know I have wireless networking and cordless phones on 2.4GHz but my Spektrum works perfrectly in the house.

But carrying a 2.4GHz downlink is a whole set of extra problems. You're guaranteeing that the strongest signal in the RF pass band of the receiver is going to be the downlink, and it will be much stronger than the signal from the control transmitter once you start flying a few tens of yards away. The result will be reduced range.

I also find that my wireless networking causes interferance on my 2.4GHz video downlink when I play with it in the house. I wouldn't be surprised to see interferance on the video caused by the Spektrum too, but I've not actually tested this.

Rob
Eco8, Piccolo Fun, Shogun, HB Elite CP, Trex 450XL CDE, Swift

01-12-2007 Over year old.

tim deakin
Veteran
Location: gloucestershire uk

buy the pcm 9x, it has ten times the features!
plus! 'correct me if i'm wrong' so far spectrum frequencies are only10mW as opposed to 100mW with the normal 35MHz in the uk,is this different in the USA?

until it improves I for one am going to leave it alone.

01-12-2007 Over year old.

Rob_T
Elite Veteran
Location: Tualatin, OR - USA

I think the transmitter power both in the UK (35MHz) and US (72MHz) is quite a lot higher than 100mw. It's more in the 500 to 1000 mW region.

Rob
Eco8, Piccolo Fun, Shogun, HB Elite CP, Trex 450XL CDE, Swift

01-13-2007 Over year old.

9387ASH
Elite Veteran
Location: UK

RF output power in the UK is limited to a maximum of 100mW for both 35 MHz, 40 MHz and 2.4 GHz. Though the typical RF O/P power is around 50 - 60 mW on 35/40 MHz.

01-13-2007 Over year old.

Rob_T
Elite Veteran
Location: Tualatin, OR - USA

Wow, I'm surprised! I had the figure of 1.5W at the back of my mind for the maximum power in the UK, and I know that the old RCME design ran at close to 1W, but that was back in the 80's and I haven't had any need to follow the regulations for the last 10 years (being on the other side of the pond these days...). 100mW ERP is not much at all!

The US version of the 9303 is spec'd at 750mW output power, but I suspect that's RF into the antenna rather than ERP.

Rob
Eco8, Piccolo Fun, Shogun, HB Elite CP, Trex 450XL CDE, Swift

01-13-2007 Over year old.

PaulJC
Elite Veteran
Location: Hertfordshire UK

I like my 9x2 and wont be changing it for a while, even then it'd probably be for a 12x over the dx7

Welcome to RR village a tight knit community of geeks & gossips.

01-13-2007 Over year old.

tauscnc
Veteran
Location: IL : www.cuttingedgecnc.c om

Just curious but why does the amount of mW matter as long as it works in the application intended?

01-14-2007 Over year old.

HOMEPAGE

tim deakin
Veteran
Location: gloucestershire uk

Hz is the freqency, Mw is the range. so if the 9x2 is 100Mw and the spectrum is 10Mw, does this mean the 9x2 has 10x the range? is this why the spectrum is sold only for small park fliers?

01-14-2007 Over year old.

tauscnc
Veteran
Location: IL : www.cuttingedgecnc.c om

The DX7 is full range...the DX6 is for park flying only.

taus

01-15-2007 Over year old.

HOMEPAGE

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Radio - JR & Spektrum DSM > Spektrum or 9x?

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