fly boy3 Posted November 22, 2014 Share Posted November 22, 2014 Hi all, can anyone tell me what the abbreviations, DSMX and DSM2 stand for. Thanks Edited By fly boy3 on 22/11/2014 11:29:05 Quote Link to comment Share on other sites More sharing options...
Pete B Posted November 22, 2014 Share Posted November 22, 2014 Protocols for Spektrum radio gear. DSMX is a frequency-hopping system, DSM2 selects two frequencies. They are backwardly compatible, so a DSMX Tx operates a DSM2 Rx and vice versa. Life's too short to find out what the letters mean, though... Pete Quote Link to comment Share on other sites More sharing options...
Phil Green Posted November 22, 2014 Share Posted November 22, 2014 Early Spektrums used simple DSM, one channel. DSM is digital spectrum modulation, Spektrums proprietary name for their implementation of direct sequence spread-spectrum modulation (DSSS). The name "Spektrum" causes some confusion when talking acronyms and protocols in a spread spectrum environment. To add some resislience they came up with DSM2 which is DSM over two channels, ie the same data is sent on one channel then repeated on another. The channels are chosen at switch-on time according to band occupancy. These are not channels in the 35mhz sense of channels - DSM is wideband, a channel is the centre of an area of the spectrum, and the data is spread right across the breadth of the channel. This selection of two channels is not very clever as band occupancy can change at any time during a flight and once chosen, the two channels were fixed. It could be said that DSM and DSM2 do not actually comply with regulation requirements but Spektrum managed to convince the authorities that DSM2 was a multi-frequency system. (Incidentally, FASST no longer complies either) As a result of this and customer demand, Spektrum added hopping to their DSM2, calling their new protocol DSMX. [/Nutshell] Cheers Phil Edited By Phil Green on 22/11/2014 14:19:48 Quote Link to comment Share on other sites More sharing options...
fly boy3 Posted November 22, 2014 Author Share Posted November 22, 2014 Thanks both for exellent explanations. Thinking of buying a Specktrum transmitter, must I be carefull in selecting a receiver, and are Orange receivers compatible ? Thanks both Quote Link to comment Share on other sites More sharing options...
Phil Green Posted November 22, 2014 Share Posted November 22, 2014 Anything new will be DSMX and therefore DSM2 compatible. I cant help with choice cos I'm not a Spektrum fan! OrangeRx DSM2 receivers have always been good, their first DSMX implementation had one or two bad reports but some time ago they announced their 'new' dsmx implementation which is supposedly spot on. What a lot of people do is to 'prove' a new receiver in a foamy before committing anything nice. Others just insist on OEM receivers, depends on your budget. A Spekky user will be of more help, sorry. Cheers Phil Quote Link to comment Share on other sites More sharing options...
fly boy3 Posted November 22, 2014 Author Share Posted November 22, 2014 Thanks Phil for the info. Got a lot to learn. OEM ? Quote Link to comment Share on other sites More sharing options...
Simon Chaddock Posted November 22, 2014 Share Posted November 22, 2014 Original Equipment Manufacturer. Just to add to the story I have no Spektrum OEM receivers (too expensive!) but use both Orange (very cheap) and Lemon (even cheaper!) with my DX6i. A mix of both DSM and DSMX. No problem with any and they seem to have a range that goes well beyond what I can comfortably see! Quote Link to comment Share on other sites More sharing options...
Pete B Posted November 22, 2014 Share Posted November 22, 2014 OEM - Original Equipment Manufacturer, ie, Spektrum brand products. Orange produce Rx's using both DSMX and DSM2 protocol which can be used with Spektrum or Orange DSMX or DSM2 Tx's. LemonRC also produce DSMX and DSM2 Rx's and have just released a compatible telemetry module. I believe Orange are going the same way. Spekky Rx's work fine, as do both of the others, in my experience. In the end, for the average flyer, it really comes down to choice and budget... Pete Quote Link to comment Share on other sites More sharing options...
fly boy3 Posted November 22, 2014 Author Share Posted November 22, 2014 Hi Simon, thanks for the gen. After Xmas hope to buy DX6i with orange receiver. As Pete says, choice and budget. Thanks Pete. Orange receivers are getting better publicity now than when they first came out. Phil's idea of testing them out in a foamy is a good one, don,t own a foamy, but I have a few hacks I could use. Thanks all. One more question, if I may, The DSi6 comes in mode 1and 2, I think. what sort of a job is it to change gimbals if required. Cheers Quote Link to comment Share on other sites More sharing options...
Phil Green Posted November 22, 2014 Share Posted November 22, 2014 Posted by Phil Green on 22/11/2014 15:24:15: ... I cant help with choice cos I'm not a Spektrum fan! Having said that, the single-channel Gem transmitter in the avatar is Spektrum, it uses the RF board from a DM9 module! That particular Sharkface has been a reliable S/C hack for well over 4 years now. Has an OrangeRx R610 receiver. Quote Link to comment Share on other sites More sharing options...
Pete B Posted November 22, 2014 Share Posted November 22, 2014 Instructions on changing the mode of the DX6i are here Pete Quote Link to comment Share on other sites More sharing options...
PatMc Posted November 22, 2014 Share Posted November 22, 2014 Redundant post deleted. (Slow typing) Edited By PatMc on 22/11/2014 18:52:58 Quote Link to comment Share on other sites More sharing options...
Pete B Posted November 22, 2014 Share Posted November 22, 2014 Sorry, Pat - I really must get a life...... Pete Quote Link to comment Share on other sites More sharing options...
GONZO Posted November 22, 2014 Share Posted November 22, 2014 Posted by Phil Green on 22/11/2014 11:56:55: ...................... (Incidentally, FASST no longer complies either).......................... Cheers Phil Edited By Phil Green on 22/11/2014 14:19:48 Is this the requirement in the new European 2.4gHz regs for 2015 that requires all NEW devices to listen before transmitting of which you speak? It will still be legal to use existing equipement you just will not be able to buy any new. Or, is there something else? Quote Link to comment Share on other sites More sharing options...
fly boy3 Posted November 22, 2014 Author Share Posted November 22, 2014 Thanks Pete, hope I can get a mode 1 somewhere (mostly mode 2 seen so far) Don't fancy my big digits fiddling in the Tx LoL. Would a changeover invalidate the guarantee ? Quote Link to comment Share on other sites More sharing options...
Pete B Posted November 22, 2014 Share Posted November 22, 2014 I'd check with the retailer first, fb3. I'd prefer to get the correct mode to start with, personally - saves any arguments later. If you're browsing for a deal, I've just Googled 'dx6i mode 1 UK' and near the top of the list was SMC, who look as if they have both modes at what seems a pretty good price to me. As you are probably aware, the DX6i has been rather overtaken by the new DX6 G2, so if you were looking for something a little more current and a lot more features, it may be worth a look... Pete Found a thread on here about mode changing.... Edited By Pete B - Moderator on 22/11/2014 21:04:25 Quote Link to comment Share on other sites More sharing options...
PatMc Posted November 22, 2014 Share Posted November 22, 2014 Since the instructions to do it are in the manual, you could probably get the vendor to change the modes for you especialy since the DX6i is being sold at a discounted price by several retailers. Again ref the instruction manual I don't see that there should be any impact on the warranty. Quote Link to comment Share on other sites More sharing options...
fly boy3 Posted November 22, 2014 Author Share Posted November 22, 2014 Thanks PatMc, for that, perhaps that might be an option. Cheers Quote Link to comment Share on other sites More sharing options...
fly boy3 Posted November 22, 2014 Author Share Posted November 22, 2014 Hi Pete exellent find. My Googling skill need to be sharpened. I was Googling retailers then checking what they had in stock, not entering mode 1 in the search, hope you don't think I was lazy. Thanks again all who have helped. Cheers Quote Link to comment Share on other sites More sharing options...
Phil Green Posted November 22, 2014 Share Posted November 22, 2014 Posted by GONZO on 22/11/2014 19:14:00: Posted by Phil Green on 22/11/2014 11:56:55: ...................... (Incidentally, FASST no longer complies either).......................... Cheers Phil Edited By Phil Green on 22/11/2014 14:19:48 Is this the requirement in the new European 2.4gHz regs for 2015 that requires all NEW devices to listen before transmitting of which you speak? It will still be legal to use existing equipement you just will not be able to buy any new. Or, is there something else? Most spread-spectrum transmitters have a very low duty cycle but the problem is that FASST has a huge medium utilization (Mu) of 25%, exceeding by quite a margin the 2015 EN300328 1.8.1 regs when they are applied. Heres the final draft document: **LINK** Quote Link to comment Share on other sites More sharing options...
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