I made sure my receiver could recognize DSMX sats but was wondering if its better to set them to 11ms or use 22ms. I currently have mine set to 11ms. Admiral Well-Known Member. The simplest but most explanatory definition I have seen Plagiarized from another site. DSMX is basically two layers of multi-access techiques. The coding schemes are designed in such a way that even if two stations are transmitting on the same frequency, the respective signals can still be isolated by the receivers, thanks to the coding schemes.
CDMA is great, because it's resilient to static, interference and other transmitters transmitting on the same frequency. However, there's a limit to how many stations can transmit on the same frequency before the signal gets too diluted to be successfully isolated by the receiver. So DSM2 employs a simple scheme to try to avoid this.
When starting up, the transmitter tries to find two free frequencies and starts transmitting. The receiver is scanning the frequencies for the unique signature of its paired transmitter.
Once found, the receiver locks in and you have a working link. DSM2 uses two separate channels, so if one gets knocked out by interference, the other channel may still be usable. The problem is that the channel allocation happens on transmitter startup, so if both channels become unusable at some later point in the flight, you may still lose the link. And that's why DSMX was designed. DSMX essentially uses the same encoding scheme as DSM2, but the frequency changes thousands of times per second according to a pseudo-random sequence negotiated between the transmitter and receiver.
Even if some channels used become completely saturated and unusable, it would normally only result in cut-outs a couple of milliseconds, which would be too short to even notice in theory. Each time the transmitter transmits a packet or the receiver receives a packet they will hop to the next channel. From this information you can conclude that when you use DSM2, and both the channels that were chosen are getting used by a lot of other users your reception will drop enormously.
The transmitter doesn't have a syncing procedure, because it determines the timing for the receiver. The transmitter will then choose a random odd channel and starts sending the binding packet at a very high rate.
The receiver will start at the first odd channel and waits a bit longer then the rate the transmitters sends at. When it does receive a packet, it will check if it is a valid bind packet and goes to syncing mode. When it doesn't receive a valid packet it will go to the next channel and will repeat this. And that's why DSMX was designed. DSMX essentially uses the same encoding scheme as DSM2, but the frequency changes thousands of times per second according to a pseudo-random sequence negotiated between the transmitter and receiver.
Even if some channels used become completely saturated and unusable, it would normally only result in cut-outs a couple of milliseconds, which would be too short to even notice in theory. Foam Addict Squirrel member Mar 5, Yes and no. I've been blanketed several times with DSM2, and did lose one plane because I couldn't recover it after being blanketed.
That being said, unless you are flying a souped up stryker or Pylon racer, you probably won't notice it. Yes, DSM2 is fine for most areas and aircraft, especially indoors. If you are flying alone, and you are not flying near any sources of radio interference, there will likely be no difference between DSM2 and DSMX.
If you are just flying a cheap foamy, I really wouldn't worry about using DSM2. Easy terms: DSM2 uses 2 channel hopping on the 2. If you are away from wireless security cameras, microwaves and saturated wifi spots, both work equally well. Cyberdactyl Misfit Multirotor Monkey Mar 7, DSM2 is fine with other 2. You must log in or register to reply here.
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