RE: Spektrum DX-7

RE: Spektrum DX-7
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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> RE: Spektrum DX-7

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RE: Spektrum DX-7 - 10/24/2006 6:48:08 PM

Geistware

Posts: 12946
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From: Locust Grove, GA, USA
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k3 valley flyer and KB9STD,
I wasn't going to say this but since you two bring this up, I looked at the JR 7202 and the Spektrum DX-7 and was wondering when someone would look at the two and swap the RF section and test it. Seems like an easy reverse engineering project from someone with the right equipment. How difficult was it to do the conversion?

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Information on the building and flying of Radio Control Aircraft.
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(in reply to k3 valley flyer)

Post #: 51

RE: Spektrum DX-7 - 10/24/2006 6:58:39 PM

iflyj3

Posts: 985
Joined: 5/18/2002
From: Paris, KY, USA
Status: offline

quote:

ORIGINAL: Geistware

k3 valley flyer and KB9STD,
I wasn't going to say this but since you two bring this up, I looked at the JR 7202 and the Spektrum DX-7 and was wondering when someone would look at the two and swap the RF section and test it. Seems like an easy reverse engineering project from someone with the right equipment. How difficult was it to do the conversion?

Gentlemen,

There is a suttlety you may be missing. The DX6 is a PPM signal to the RF deck. However, if you read the DX7 announcement it says the receiver also listens to the xmitter for the correct model to have been selected on the transmitter. The only way this can happen is this data is also sent at binding time. This is not a standard componet of a PPM signal. Therefore, I sumerize that the DX7 transmitter has some different firmware and that would make it not practicable to put its RF deck in another transmitter.

Just my $.02

_____________________________

Dan Thompson (Long live the ACE MicroPro 8000)
Visit www.groups.yahoo.com/group/mp8k for support

(in reply to Geistware)

Post #: 52

RE: Spektrum DX-7 - 10/24/2006 7:59:51 PM

k3 valley flyer

Posts: 328
Joined: 1/9/2004
From: central , IL, USA
Status: offline

You have a good point. However, my guess is most 9303 users would be willing to lose "model match" if they had a 2.4 module to fit their 9303 tx so they could buy one module and a 2.4 receiver and still swap back the 72 module and continue to get value from their 72 band receivers. The lack of modules for the existing equipment says Horizon wants the market to not only purchase a whole new complete system but also replace all their old 72 receivers with new 2.4 ones! A big investment if you have very many old receivers! Besides I don't believe the "improvements" 2.4 offers are all that important. Mike McConnville only wants to talk about how "locked in" 2.4 is, my existing equipment is far beyond my skills already. As far as interference have not had an issue since pre 1991. Most radio glitches are really glitches of the pilots thumbs. And as far as frequency control have not had or seen a shoot down in many years. Would a 2.4 option be nice to have for a visit to a "foreign" field for a fun fly? Yes, but the benefits for general use do not justify replacing the receivers in the whole fleet. At least not yet in my current environment, I am sure others will feel and act differently and that is what Horizon is counting on.

(in reply to iflyj3)

Post #: 53

RE: Spektrum DX-7 - 10/24/2006 8:05:29 PM

Geistware

Posts: 12946
Joined: 4/9/2002
From: Locust Grove, GA, USA
Status: offline

If the radio ignores this data return, it should not prevent the RF section from being used. You just will not have that feature that the radio can utilize. RIGHT??????

quote:

ORIGINAL: iflyj3

quote:

ORIGINAL: Geistware

k3 valley flyer and KB9STD,
I wasn't going to say this but since you two bring this up, I looked at the JR 7202 and the Spektrum DX-7 and was wondering when someone would look at the two and swap the RF section and test it. Seems like an easy reverse engineering project from someone with the right equipment. How difficult was it to do the conversion?

Gentlemen,

There is a suttlety you may be missing. The DX6 is a PPM signal to the RF deck. However, if you read the DX7 announcement it says the receiver also listens to the xmitter for the correct model to have been selected on the transmitter. The only way this can happen is this data is also sent at binding time. This is not a standard componet of a PPM signal. Therefore, I sumerize that the DX7 transmitter has some different firmware and that would make it not practicable to put its RF deck in another transmitter.

Just my $.02

_____________________________

Aircraft Proving Grounds
http://www.rcaircraft.net/
Information on the building and flying of Radio Control Aircraft.
Site for hobbyist in the R.C. Aircraft modeling world.

(in reply to iflyj3)

Post #: 54

RE: Spektrum DX-7 - 10/24/2006 8:48:30 PM

MMcConville

Posts: 2003
Joined: 6/26/2003
From: Champaign, IL, USA
Status: offline

Wow guys. This is interesting. A few quick comments then I gotta run again and head to AZ for the USRA Championship race.

First, there arent any games being played. Its not nearly so simple as just just plug in a 2.4 gig module and go fly. There isa LOT of new technology involved in Spektrum. It cant be reverse engineered very easily since a lot of the technology is in the software that operates the DSM sytem, not the hardware alone.

As for the benefits, oh my gosh. Its so much more than just the response rate, whch is super fast. I just got back from an airshow in Guadalajara Mexico. Great show and a beautiful field. Unfortuantely the field is the most hostile environment I have ever flown at for radio interference. I saw issues with all brands of radios at this field. Including one I had in my 2002 TOC model (which is owned by a friend there) , where I was lucky to get it back on the ground. A BVM bandit crashed with a 14MZ in it ,etc etc.
It is accepted at this field that if you fly low off the ends of the runway, you will get lock-outs.
OK, I flew several flights on a FuntanaX with the DX7 installed. Did point rolls off of takeoff just a few feet off the gound till it was hard to see. Then installed it in a DA-100 powered Extra and did the same thing.
Seeing is believeing. It worked perfectly.
Another advantage is that it is immune to any aircraft generated noise, ie. ignition system, ecu, metal to metal contact etc.
Of course, no freq pins and you cant get "shot down". It is amazing!!!!

When I get to AZ tomorrow, I plan to pull out the 72mHz system and install DX7 in the F1 giant scale racer to fly it in the champ race. Its about 190mph on the course. I have no worries about using DX7 even in this model.

BTW, I dont get paid to say this stuff, and honestly I wouldnt if I didnt believe in the system. I'm just that excited about the Spektrum system.

_____________________________

Mike McConville
Horizon Hobby

(in reply to Geistware)

Post #: 55

RE: Spektrum DX-7 - 10/24/2006 9:38:59 PM

Bosshossv8

Posts: 1664
Joined: 8/12/2003
From: Schiller park, IL, USA
Status: offline

Mike,

Glad to hear that it will be tested in a screamer. I like the technology, it is great.

And, it is the END GAME as far as our radio link is concerned. It will be in RTF packages and defacto standard in a few years.

Some of us are having a hard time knowing that after purchasing a high end TX, we may need to 86 it, and get another to use the best technology.

IF and I say IF modules or retro-fits of the current high-enders can happen, it will. Time is on the consumers side. Spektrum has made everyone take notice. Good things happen next.

I will use my DX6 all dome season, watching, reading.........waiting.

_____________________________

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(in reply to MMcConville)

Post #: 56

RE: Spektrum DX-7 - 10/24/2006 10:21:33 PM

GJr.

Posts: 263
Joined: 5/17/2003
From: Nashville, TN, USA
Status: offline

I hope they can bring this technology to a 12 or more channel system to use with jets and scale planes. As long as the programing and channels are there to use, it looks good. I do not need pictures, music, touch screens, etc to fly my planes.

_____________________________

Glen

(in reply to Bosshossv8)

Post #: 57

RE: Spektrum DX-7 - 10/24/2006 10:26:21 PM

k3 valley flyer

Posts: 328
Joined: 1/9/2004
From: central , IL, USA
Status: offline

So once and for all, are you saying 2.4 modules for existing JR transmitters are never coming? Simple question begging for a straight forward answer.

(in reply to MMcConville)

Post #: 58

RE: Spektrum DX-7 - 10/24/2006 10:50:29 PM

4*60

Posts: 1267
Joined: 3/10/2002
From: Blind Bay, BC, CANADA
Status: offline

quote:

ORIGINAL: k3 valley flyer

Do they really think we are that stupid? Boycott comes to my mind until they get off their highhorse and play it honest!

YES! Definitely! Look around at what goes on!

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"Of course, that's just my opinion. I could be wrong." the other Dennis Miller

(in reply to k3 valley flyer)

Post #: 59

RE: Spektrum DX-7 - 10/25/2006 12:08:21 AM

Geistware

Posts: 12946
Joined: 4/9/2002
From: Locust Grove, GA, USA
Status: offline

I am more interested in how he is going to get teh DX-7 to work for IMAC without all the mixes.
I guess if matchboxes are used all around, then a simple 4 channel radio can be used with a couple of mixes built in.

Mike, thanks for the input. I know you can't share new or pre-release information, but it would be nice to know what is in the works!
Thanks and good luck at the races!

_____________________________

Aircraft Proving Grounds
http://www.rcaircraft.net/
Information on the building and flying of Radio Control Aircraft.
Site for hobbyist in the R.C. Aircraft modeling world.

(in reply to 4*60)

Post #: 60

RE: Spektrum DX-7 - 10/25/2006 12:27:27 AM

KB9STD

Posts: 215
Joined: 4/26/2002
From: Evansville, IN, USA
Status: offline

Your absolutely right ,Dan.I hadn't considered the incorrect model lockout feature.However,they state that the transmitter will work with the DX6's receivers.So,I assume the Model data sent isn't prohibitive.The feature would have to be incorporated into the transmitter receiving the DX7 rf section,or be disabled in the receiver(the latter might not be too difficult).
My point however,was that the Spread Spectrum technology shouldn't be incompatible with a "Module" based system for current transmitters.Until they threw the "Lockout" unless the correct model is selected feature in,the system would ork perfectly as such.

(in reply to iflyj3)

Post #: 61

RE: Spektrum DX-7 - 10/25/2006 12:40:54 AM

iflyj3

Posts: 985
Joined: 5/18/2002
From: Paris, KY, USA
Status: offline

I would ASS-U-ME that the DX7 can transmit either protocol. They didn't say that you had to tell the DX7 xmitter which receiver you are using. If the model I.D. command is a command that the AR6000 ignores then you wouldn't have to tell it.

We'll know more when we can get our hands on one.

_____________________________

Dan Thompson (Long live the ACE MicroPro 8000)
Visit www.groups.yahoo.com/group/mp8k for support

(in reply to KB9STD)

Post #: 62

RE: Spektrum DX-7 - 10/25/2006 2:27:31 AM

MMcConville

Posts: 2003
Joined: 6/26/2003
From: Champaign, IL, USA
Status: offline

The module issue isnt an evasive one. I dont know the answer.

For an IMAC airplane, I really dont use a lot of mixes. Usually one for ail, one for dual elev. Then a few free mixes for pitch and roll couple mixing if needed. The DX-7 has flapperon mix, and 6 p-mixes. Plenty for an IMAC model actually.

The GS racer actually presented more of an issue since it uses 8 channels, (2 x ail, 2 x elev, rudd, thrott, mixture and pressure dump) with a curve mix for active mixture control. I ended using a Matchbox for aileron and the rest was simple. Did have t use a 3 point mix instead of a curve for mixture but I lev will work fine.

_____________________________

Mike McConville
Horizon Hobby

(in reply to iflyj3)

Po