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Old Jul 27, 2012, 04:58 PM
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Question

DSMX/DSM2- TX always sends both signals?


So if DSMX transmitters are backwards-compatible with DSM2, then a DSMX TX always has to send both DSMX and DSM2 signals, correct?
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Old Jul 27, 2012, 05:22 PM
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No. The transmitter determines when binding what kind of receiver it's dealing with and remembers. Same as DSM vs DSM2 with older transmitters.
Old Jul 27, 2012, 05:33 PM
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How does the transmitter know?

I'd guess you could tell the TX through the model memory but there's a DSMX DX5, which has no memory.

Or does a DSMX receiver have a low-power transmitter to talk to the TX?
Old Jul 27, 2012, 05:58 PM
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That's right. The receiver tells it. Same with DSM2.
You can think of the DX5e as having one memory.
Old Jul 28, 2012, 10:16 AM
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Unfortunately, with the DX5 DSMX version, you will have to rebind every time you switch between a model with a DSM2 (BNF) receiver and a model with a DSMX receiver afaik. I would have thought they'd just leave it as a DSM2 radio, thatway it wouldn't make a difference if the receiver was DSM2, or DSMX.
Pete
Old Jul 28, 2012, 07:04 PM
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Quote:
...
Or does a DSMX receiver have a low-power transmitter to talk to the TX?
receivers talk back to the radio.
Old Jul 28, 2012, 07:17 PM
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Quote:
Originally Posted by pilotpete2 View Post
Unfortunately, with the DX5 DSMX version, you will have to rebind every time you switch between a model with a DSM2 (BNF) receiver and a model with a DSMX receiver afaik. I would have thought they'd just leave it as a DSM2 radio, thatway it wouldn't make a difference if the receiver was DSM2, or DSMX.
Pete
This came up earlier today with regards to the DX4e.
You can force the DX5e to be in DSM2 only mode if you want during binding.
Details are in the manual on page 6.

As far as the " low power transmitter" in the receiver thing, the chip sets they are are transceivers and can operate in either mode.
In fact there is a guy on here who is selling low power DSM2 RF modules made from receivers!

http://www.deltang.co.uk/tx1.htm

Pat MacKenzie
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Old Jul 28, 2012, 08:51 PM
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Quote:
Originally Posted by pilotpete2 View Post
Unfortunately, with the DX5 DSMX version, you will have to rebind every time you switch between a model with a DSM2 (BNF) receiver and a model with a DSMX receiver afaik. I would have thought they'd just leave it as a DSM2 radio, thatway it wouldn't make a difference if the receiver was DSM2, or DSMX.
Pete
But that way you wouldn't have DSMX functioning when you have a DSMX receiver.
Old Jul 29, 2012, 10:06 AM
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Originally Posted by pilotpete2 View Post
Unfortunately, with the DX5 DSMX version, you will have to rebind every time you switch between a model with a DSM2 (BNF) receiver and a model with a DSMX receiver afaik. I would have thought they'd just leave it as a DSM2 radio, thatway it wouldn't make a difference if the receiver was DSM2, or DSMX.
Pete
The DX5 (I do have one) must be rebound each time you change a rx.
It is , in this respect much like other brands.
The thing that is relevant is that it is compatible with all th e other DSM2/DSMX rx offered by Spektrum.
Compatibility is very important to me -I do have one non Spektrum system It works very well but being incompatible it is simply wed to one model-just like I had 40 years ago.
Old Jul 29, 2012, 08:13 PM
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Pat,
Thanks for the clarification. That makes a lot of sense to do that
Pete


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