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» 2019 Llanfair TH Village Fete
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Saturday 7/7/18

2018-07-07, 21:07 by Gary M Jones

I was at the field today between 14:00 & 15:00 all on my own , good flying too. There is a dead sheep along the fence line towards the gate from the pits, I saw the farmer so reported this to her. I hope no one had plans for a BBQ Smile .

Farmer …

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2.4 ghz

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Post by Guest on 2009-12-29, 14:20

So Have I got this right, my dx7 will ONLY work with DSM2 receivers, Who else makes DSM2 receivers?
Will my dx7 work with say a JR receiver?


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Post by Guest on 2009-12-29, 15:42

Yes you have to use DSM2 recievers. JR 2.4 Ghz recievers are DSM2 but I think they only make 9 channel and above. They are also expensive. Spectrum of course make the full range from 5 channel up. To my knowlege JR and Spectrum are the only people who use the DSM2 protocol. In the beggining a brit named John Beard working in the states invented and patented the DSM2 protocol and then used a JR TX case and mechanics to produce his first outfit the DS7 thus alowing him to get into the market without the outlay of tooling up to produce a completely new TX.. Part of the deal was that he licenced JR to use the DSM2 protocol but only for 9 channel and above thus keeping the sports market up to 7 channel for himself. A clever and probably now a rich man.


The above comments are on the aircraft and helicopter sets and there may be Spectrun and JR sets out there for car use on 2 or 3 channels


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Post by Tim on 2009-12-29, 19:04

Timbo puts his pedantic hat on and says....
Actually the DX7 will work with both types of DSM protocol - the earlier and original DSM, as well as the later and now standard DSM2.
The early DX6 transmitters from Spektrum were DSM only and will NOT work with the DSM2 receivers, but all subsequent transmitters such as the DX6i and 7 etc are DSM2 and "backward compatible"
DSM versus DSM2 ?? -Same concept, with different bitrate and encoding.
DSM2 has a higher bitrate, supports up to 2048 channel resolution and uses lower average power (since each frame take less time to send) so gives almost double the Tx run time on the same battery. The Dx6i and DX7 automatically select the correct version when binding to the Rx. As only the DSM2 receivers transmit back to the Tx ( during bind only ) the Tx then knows if its being bound to a DSM receiver by the lack of DSM2 signal, so will automatically select DSM transmission system. Clever stuff.
Its still perfectly possible to get DSM receivers - in fact I have 2 of the AR6000 units in slopers, and although they state park fly range only, they are superb and I fly them a LOOOONG way out, using either my Dx6i or DX7 transmitter. Your DX7 will work only with Spektrum receivers ( any type ) or 2.4Ghz JR receivers.
JR do make a 7 channel 2.4G receiver but at £85 why would you Wink

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Post by Guest on 2009-12-29, 19:48

I liked your 2.4G Spectrum report Tim in this thread. Very comprehensive. I had all sorts of questions about Spectrum but now you have provided a lot of the answers.
Just what was needed.

And Dave S too
I never did understand the arrangement that exists between JR and Spectrum.


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