redcon cm 703 sat receiver

  • vmaxer
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14 Mar 2019 17:06 #1 by vmaxer
redcon cm 703 sat receiver was created by vmaxer
this arrived tuesday and i could,nt wait to put it in my new dynam spitfire:woohoo: :woohoo: but after two days of trying to get it to work i find that it will not work with the futaba orange 2.4 modem :( this will teach me to do more googling before i buy [badass] :whistle: so now looking for good reliable long range receiver
to fit in her
answers on a post card pleaseB)

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14 Mar 2019 19:11 #2 by Quorneng
Replied by Quorneng on topic redcon cm 703 sat receiver
I would be almost tempted to simply get a new DSMX 6ch Tx. ;)

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14 Mar 2019 20:32 - 14 Mar 2019 20:36 #3 by Eric
Replied by Eric on topic redcon cm 703 sat receiver
Brand Name: REDCON
Item Name: CM703
Band: 2.4G
Channel: 7
Operating Voltage: 3.3V-9.6V
Modulation: DSM2/DSMX
Dimensions: 47 x 24x14 mm
Weight: 10g (4.8g Naked)
Brown-Out Voltage: 4.0v (Always supply power above this voltage)
Antenna Length Main RX: 13.5cm (2)
Expected Range: 800m (tested with JR DSX9)
PPM Output: Yes (support RC multicopters)
Compatible Transmitter: JR and Spektrum DSMX DSM2 transmitter

So - it is compatible with Spektrum tx's, not Futaba. Are you trying to use a Spekky module in the Futaba tx - or the Futaba tx without any other module?
Futaba is FASST, not DSMX, and the two will not match up!
-
AND it brownouts at 4v. What supply were you planning on using to drive it? A 4 cell nimh is only 4.8v! Four servos moving at once can momentarily drop the volts to less than 4, even down to 3.5, depending on the load. As the notes say, this rx is for quadcopters, - where there are NO servos!

if you are calm and collected when all about you are going berserk - you've missed something important!
Last edit: 14 Mar 2019 20:36 by Eric. Reason: typo

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14 Mar 2019 21:08 #4 by vmaxer
Replied by vmaxer on topic redcon cm 703 sat receiver
tx futaba 9c super with orange dsm2 dsmx module and 2200 3s battery eric

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14 Mar 2019 23:43 #5 by Quorneng
Replied by Quorneng on topic redcon cm 703 sat receiver
On the Banggood website the specification for the Redcon cm 703 includes these two lines.

Patent pending Model Match prevents flying a model using the wrong model memory (feature does not work with module systems)
Servo Sync (feature does not work with module systems)

Which I guess means it won't work (properly?) with your set up.

I have a Redcon cm703 (but with no satellite) and it works fine on my Spektrum DX6i. ;)
Thanks: vmaxer

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17 Mar 2019 15:09 - 17 Mar 2019 15:10 #6 by vmaxer
Replied by vmaxer on topic redcon cm 703 sat receiver
so come on peeps someone must be using the orange dsm2dsmx futaba module which receivers are you using please:unsure:
Last edit: 17 Mar 2019 15:10 by vmaxer. Reason: spelt wrong

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17 Mar 2019 15:39 #7 by Eric
Replied by Eric on topic redcon cm 703 sat receiver
Sorry, but I use Futaba with Futaba, and Taranis with Taranis!
I have successfully used a couple of Orange fasst rx's with the Futaba.
Doesn't really help much, does it! [badass]

if you are calm and collected when all about you are going berserk - you've missed something important!

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17 Mar 2019 17:45 #8 by Quorneng
Replied by Quorneng on topic redcon cm 703 sat receiver
Sorry me too
All DSM2 or DSMX (including RedCon) but all with Spektrum Txs.
Thanks: vmaxer

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23 Mar 2019 12:30 - 23 Mar 2019 12:42 #9 by Klipkopwildlife
Replied by Klipkopwildlife on topic redcon cm 703 sat receiver
Right, I bought this Orange TX module from Hobby King,

It's for the 8" Sopwith Pup I built. The only RX I could find was this one from Banggood.

Anyway about a week ago I decided to put it all together, of course it's too late to send anything back! I found the JST plugs wouldn't fit! so attacked the servo plug to no avail! After doing the checking that I should have done when ordering I discovered the sockets on the RX are JST 1.0mm and the servos have JST 1,25mm plugs. Grr, well it is only a 10thou difference! Correct servos now on order.
After having thought about it for a while I realised I could still test if I hooked up the motor to the RX board, naturally the battery connections don't match so I had to make a plan.

Do it now, you may never get another chance
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Last edit: 23 Mar 2019 12:42 by Klipkopwildlife.

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23 Mar 2019 13:29 #10 by Klipkopwildlife
Replied by Klipkopwildlife on topic redcon cm 703 sat receiver
So, I plugged the TX into my T9CP, powered up the RX and...... nothing! The TX gave me 3 beeps and the RX light started flashing. After about an hour of messing about I decided reading the instructions would be in order! The RX blurb mentions a 'Bind' plug but there's no mention of where to put it, and there wasn't one in the packaging.
Reading about the TX module reveals the existence of a row of dip switches inside the module. Opening the case reveals the first problem, while the web site clearly shows switches the module has none, just a row of solder pads. So, think I, being a Neanderthal, I could solder straps across the pads to change the functions. But being an idle bugger I decided to try without. So, first check the T9 is sending a PPM signal (some can be changed to PWM). To start the bind process, press in the bind button on the module and switch on, then power up the RX. Nothing except the RX light turned from solid to flashing (it may have done this before).
Now here's the thing all my life Ive been trained to switch the TX on, then the RX, it's ingrained! However this TX normally has a Assan 2.4gig module in it which only works if the RX is on first and then the TX with all rates are on full. (I did know why but my brain is like Swiss cheese these days)
Powered up RX, light went from solid to flashing, switched on the TX with the Bind button pressed, kept it pressed, the RX light went solid, and Bingo it's bound and the motor runs. I have no doubt that the servos will also be fine once I get them.
I hope this helps.

Do it now, you may never get another chance

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23 Mar 2019 16:07 #11 by Quorneng
Replied by Quorneng on topic redcon cm 703 sat receiver
The equivalent Orange version has the same four 1mm JSTs but along side there is a conventional 1.5 MM JST bind plug.

Does this mean that the Redcon version has an automatic bind?

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23 Mar 2019 18:17 #12 by Klipkopwildlife
Replied by Klipkopwildlife on topic redcon cm 703 sat receiver
Don't know about the Redcon Q, it would appear that binding can be achieved using the TX or the RX depending on which flavour you have. What the manual does say is that the transmitted power in bind is .006mW! While the range test output is 1mW. Obviously the bind power is kept really low to stop some else's RX from binding to your TX by accident.

Do it now, you may never get another chance

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23 Mar 2019 18:27 #13 by Eric
Replied by Eric on topic redcon cm 703 sat receiver
Looking at Tony's rx - one short antenna tells me it is only a short-range park-fly.
I know he's about a million miles from the next house - but - - - - [badass]

if you are calm and collected when all about you are going berserk - you've missed something important!

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24 Mar 2019 09:43 #14 by Klipkopwildlife
Replied by Klipkopwildlife on topic redcon cm 703 sat receiver

Eric wrote: Looking at Tony's rx - one short antenna tells me it is only a short-range park-fly.
I know he's about a million miles from the next house - but - - - - [badass]

I'm not sure how far an 8" Pup is going to be before it's out of sight, certainly not very, with my eyesight! Although the blurb does not mention whether it 's full range the Redcon blurb does.
However, back to business, the purpose of my excercise was to determine whether the Orange TX module as fitted in a Futaba T9CP would operate a receiver marketed as "DSM2/DSMx", which it does.
What has popped up out of this discussion is that Binding a DSM receiver can be initiated from either the TX or the RX. Suppose you are at the patch and you switch on ready to test, and someone else who has left their Bind plug in switches on their aircraft. You then switch off, the next time you switch on you have a potential shoot down, a long shot, and I'm sure someone else could explain it better.
It certainly explains why people who fly DSM alone, (I'm thinking Garry (RiP) and Simon) never have problems.
With the exception of Futaba 2.4gig all of my TX's initiate the Bind procedure from the TX at a greatly reduced TX power. I know which I prefer!
Rereading this reminds me of something my Managing Director once said "When you're up to your backside in Crocodiles, it's often difficult to remember the original intention was to drain the Swamp!"

Do it now, you may never get another chance
Thanks: Eric, THE BLACKBIRD

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24 Mar 2019 23:54 - 24 Mar 2019 23:54 #15 by Quorneng
Replied by Quorneng on topic redcon cm 703 sat receiver
Certainly with Spektrum the Tx the bind switch sets it to low power. The instructions say the Rx has to be close to the Tx to bind. From my own experience no more than 6 ft although as it is a 'handshake' procedure this may also be due to the very low transmitting power of the Rx.

My issue with the single short aerial is the risk of it being 'blanketed', particularly if it set straight down the fuselage so it is 'end on' to the Tx with the motor exactly in the way. For a tractor the risk is greatest when the plane is low down and coming towards you - like on finals?
Last edit: 24 Mar 2019 23:54 by Quorneng.

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