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Aidan:

--- Quote from: "Ron" ---One more thing..... (Sorry about all these questions :oops: )

When you've got a 9v Rx and are using a 14v LiPo, where do you get the Rx power from?
Usually it gets it from the ESC, so how do you connect it all up? :?

Ron
--- End quote ---

A lot (maybe all?) of the recent 2.4GHz systems cater for higher voltage than the typical 4 or 5 cell nickel packs. I think both Jeti and Spektrum can handle anything from about 3.5V up to 9V. This caters for those wanting to use 2s lipo or LiFe cells instead of NiCd or NiMH and you may even be okay with a single lipo cell for lightweight stuff. But...as Keith says, the servos need to be compatible with those voltages too. At the moment some are but most aren't. Typically servos are rated for 6V max.

Your 2.4GHz receiver will run on the same power supply your existing receivers did.
You can use the BEC built into the ESC if it's rated for 4s use (many ESCs are only rated for BEC up to 3s or might only manage 1 or 2 servos on 4s.). Alternatively you can use a separate BEC or put in a separate receiver pack. I think a separate receiver pack is a good idea for larger models from a safety point of view but I'd probably use the ESC or a separate BEC in the Squall. If your ESC has a BEC, like most do, and you're not going to use it, don't forget to disconnect the positive pin from the connector to the receiver!

Aidan

Ron:
Right :D
Thanks all/both.

It will be a new installation in the Squall, so no existing setup.
The LiPo will be a 4s (14 volts) and I guess the ESC supplied will be OK for that.

I hadn't appreciated that ESCs have battery eliminators in them to supply the Rx etc.
The Rx I will be using is a Multiplex one, and that says:

Specification:
Servo channel count 5
Reception system 2.4 GHz FHSS (Frequency
Hopping Spread Spectrum)
Operating voltage 3.5 … 9.0 V
Power supply 4 - 5 NiXX cells, 2S LiPo / LiIo
Operating temperature range -20°C … +55°C
Dimensions (L x W x H) approx. 34 x 19.5 x 11 mm
Weight approx. 7 g

So it will only take 9v max. Hence my question.

So if I've got this right, ESCs have BECs (had to look up that term :oops: ) built in, to supply the Rx and servos.
And i have to be sure the BEC will handle the total current needed by the Rx and all the servos working at once 8)

Or if I fit a separate Rx battery (not in the Squall) I've obviously got to disconnect the + BEC supply coming from the ESC.

Ron

Happy Days:
Yea’ pretty much Ron. :clap:  

It’s not true to say that all ESC’s have BEC’s, but the one that comes with your Squall will, which will be more than capable of running your rx and the three servos the model will need. Even with the VT unit fitted.

That’s one of the nice things about the purchase, most the electrical equipment that’s needed is supplied with the model. (You haven’t got to figure out what will match up with what!)

You will need three servo extension leads though. (and the servos) No doubt you have some in your workshop somewhere. :wink:

Keith

Ron:
Thanks Keith.

Yes sure there must be some servo extensions somewhere about in the mess that passes for a workshop. :oops:

Ron

Alan_Perse:
Hi Ron.
How do you find the multiplex module. I've had a few flights with mine and it seems to work great.

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