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Revolution Models . CarbonXtreme . Midland Helicopters

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Radio - JR & Spektrum DSM > Spektrum module in a futaba 10c
 
 
village_idiot
Senior Heliman
Location: Land of confusion

http://www.rcgroups.com/forums/showthread.php?t=932306

We'll see how it turns out.
10-01-2008 04:07 PM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

My 10c is on the truck for delivery some time this morning, and I'll be picking up the module at the LHS as soon as the UPS truck leaves. You'll have a definitive answer soon enough. If it does work, I have the antenna for a CX2 on the way (due tomorrow), and I'll be voiding my warranty by running the antenna internally to the port on the top.

Pics and such will follow.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
10-01-2008 04:28 PM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

The radio just got here, now I'm off to the LHS to pick up the module. I'll have a report soon. I love that radio, the screen is great, programming is great, and it has a nice feel holding it.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
10-01-2008 04:49 PM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

Just got home, dropped the module in and set the 10c to PPM, and it works perfectly. Bound right up to an existing installation in my Craptor. I'll be doing a mod tomorrow to run the antenna completely internally, I'll post pics.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
10-01-2008 05:43 PM
 
 
village_idiot
Senior Heliman
Location: Land of confusion

You aren't really going to void the warranty on your brand new radio are you? I can see the risk with the DM8 module since it is only $40, but the radio is a bit more than that.


Also a better instalation would be to use a screw on antenna, and buy a micro fl to RP-SMA female connector and mount the connector in the top of the radio. That way if you break the antenna, or whatever, you can replace it. Also stows in a much smaller package. You can get these cables on ebay, or Mouser, or Digikey to name a few. Same thing for the antenna, just get a 2 or 2.2 db RP-SMA antenna, cost is just a couple dollars each.


I would probably just build a box on the module to relocate the connector, and screw an antenna directly to it like I do on my 9C.
10-01-2008 05:56 PM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

Yes, I am going to drill a hole in the case and run the wiring internally. If you don't want to, don't. I do, and I don't want the wirign running externally, which is the whole reason I bought into a dedicated Spektrum JR transmitter to begin with. If the wiring isn't inside, then I have no use for the radio, just like I wouldn't want the 10c with Fasst because of the antenna arrangement.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
10-01-2008 06:12 PM
 
 
village_idiot
Senior Heliman
Location: Land of confusion

Ok. Hopefully it will work out nicely for you. Might buy a second back cover when the parts are available in case you ever decide to sell it.
10-01-2008 10:50 PM
 
 
enahs
Veteran
Location: Valparaiso, IN

Look forward to your pictures and feelings on the setup Eury.

---------
Shane Eagan
10-01-2008 10:54 PM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

Just got a few flights in to test it, 2 on my Evo, and 3 on an electric plane. I flew the plane up until it went into the cloud deck (which was at 2200 ft), and had solid control the whole time. The module works perfectly in the 10c. It was solid the whole time, and I really like the programming, especially the timers.

To be honest, I really don't care about the warranty. I'll be making a very small hole that I'm betting wouldn't even be noticed if I did send it in for service. Everything else is reversible. Also, it's been my experience that just about anything sold and serviced by Great Planes is sold "as is", and they don't honor the warranties. So, I'm going to make exactly the radio setup that I want to fly. I'm going to open the Fasst module today and see if there is an antenna port in it. If there is, I should be able to make the radio so it's switchable between Fasst and Spektrum just by swapping the module and connecting the antenna. Not that I ever intend to buy a Fasst receiver, but I may as well see if I can work something out.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
10-01-2008 11:46 PM
 
 
Heli 770
Elite Veteran
Location: Lemon Grove, Ca. USA.

Eury
Thanks, for your time, money and info.
10-01-2008 11:57 PM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

I've had a couple of PMs asking essentially the same thing, so here is the answer publicly. People are asking me why I want to do this. There's a couple of reasons.

1. I flew Futaba for over a decade. I got used to the nice things like complete switch assign-ability, and timers that can be activated with the throttle stick. Since dropping Futaba for Spektrum, then JR, I've never been able to get past those limitations, and where I never killed a Lipo prior to switching from over discharge, I've done it countless times since because I forget the timer.

2. I've got a bunch of Spektrum receivers, and I like the options that Spektrum gives me better than Futaba in the receiver market. First, all of the Futaba receivers have the plugs vertically (which I HATE), and they are more expensive, don't have the neat tech like the AR7100R, and I have 1000s of flights with Spektrum so I know it, and trust it 100% because I know how to set it up.

With the release of the 10c, Futaba finally has a radio that has all the capabilities I want in an affordable package. Unfortunately, it doesn't have the 2.4 tech I want, and I'm not going to switch to Fasst. The only way for me to get the features I want and keep Spektrum is to move to a 12x at a $1200 investment (after selling old stuff), or I can make my own radio and get exactly what I want for a $100-$200 investment (again, after selling parts I don't want). I dont' need more than the 8ch that the module based solution will provide, and once I run the antenna internally, I will have the elegant looks as well. I can detect no difference in response and performance from the X9303 to this setup, so it really is ideal for me

Really, it's a no brainer, and after setting it up and flying with it today, I made the right choice for me. It might not be the right choice for everyone, but it allows me to have exactly the radio that I want without any compromises. I'll do a full photo set on the modification as I make it tomorrow along with pics of the guts of the radio along with both modules. Maybe it'll help someone else who also misses the programming of their old Futaba, but wants the Spektrum technology for the RF link.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
10-02-2008 01:42 AM
 
 
village_idiot
Senior Heliman
Location: Land of confusion

Simple answer to why... Because you like the Futaba programming. Done, simple. That is what a module based system gives you is choice.

Extra answer might be that you have a few other modules on other bands that you still want to use like 900Mhz for Plantraco (like me).
10-02-2008 02:18 AM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

Just took it apart, here's some pics.

These pics are the inside of the 10c. It's easy to get apart, just 4 screws, and there's nothing attached to the back of it, so it's easy to work on (compared to the X9303). You can see that there is plenty of room to route the antenna cable internally. I'm planning on drilling a small hole for it on the side of the indent that the module goes into, as shown in the second pic.



Now here's the inside of the 2 modules. First the Spektrum, then the Fasst. Both have the same antenna connector on them, which raises an interesting possibility. With a little ingenuity on how the case on the module is cut, it would be possible to quickly swap between Fasst and Spektrum both going through the internal antenna by simply unplugging the cable from one module and going into the other. Or, if you are a Fasst guy, you can cut the big antenna and hump off the back of the Fasst module and run the signal up inside like Futaba should have done, getting rid of the stupid Futaba antenna setup.



Either way, after taking it apart, I can see this is a simple mod. My antenna will be in tomorrow, and I'll get it done. I'm not sure how to fasten the antenna in the transmitter, I believe it just has a big nut on the bottom so it'll drop in and tighten up, and I'll lose 72mhz ability, but gain the slick form factor of an integrated 2.4 solution.

Here's a link to the antenna, I believe it'll work fine with Fasst as well as the connector is the same, and I'm guessing that Fasst and Spektrum both use 2db gain antennas (which the CX2 antenna is, as are all the Spektrum antennas). http://www.readyheli.com/EFLB1058_T..._p/eflh1058.htm


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
10-02-2008 02:24 AM
 
 
village_idiot
Senior Heliman
Location: Land of confusion

Those micro FL connectors are only rated for a few cycles (on-off), most are rated at under 10 cycles, so frequent swapping would not be recommended.
10-02-2008 03:42 AM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

I was just told that elsewhere. I guess I take back my statement about easy swapping, it could be done if you wanted to make a whole change over, but not something to repeat.


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
10-02-2008 04:02 AM
 
 
village_idiot
Senior Heliman
Location: Land of confusion

You could mount something like the RP-SMA connector so that it sticks out the back of the spektrum module. Then screw the antenna COAX to that connector. If you look you can find push on SMA connectors connectors, but I think you would need to change to the regular polarity SMA to do this. They do not give you the same quality of connection, and at 2.4Ghz may wear out in less than 100 swaps. You would need to find an antenna that also has this connector, or learn to solder the connector on the cable properly. You would also need a micro FL to SMA chassis mount connector cable to complete the package.
10-02-2008 02:29 PM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

I made a new post with the complete conversion details.

http://runryder.com/helicopter/t463885p1/


Nick Crego
Still wanted by the government, I survive as a soldier of fortune.
10-02-2008 10:18 PM
 
 
village_idiot
Senior Heliman
Location: Land of confusion

Well, that should definitively put to rest concerns about the DM8 and 10C working together. if it didn't work it sure would have been a stupid thing to mod the radio like that, so it must work OK.
10-03-2008 02:28 AM
 
 
Kjarman
Senior Heliman
Location: noblesville, IN

This makes me soooo happy..... I have finally sold my old a$$ 9CHPS and have a 10C coming after Jan 1st.

I had been running the DM8 in my 9C so now I'll just switch it too my 10c, download campac and start flying....

I have 4 AR7000 receivers, I would not liked having to sell them all and bought new....

I sold another one to Terrafirma...... wife wants to know where the money's at!!!!
12-15-2008 03:36 PM
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Radio - JR & Spektrum DSM > Spektrum module in a futaba 10c
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