Tosh McCaber Posted December 19, 2020 Share Posted December 19, 2020 I have a Spektrum AR9020 RX. The Rx came as part of my DX9 package. All the servo slots have wedge shaped, presumably polarity, guards, which are a real pain. It means having to chisel wedges off the edges of my servos- quite difficult. Almost as bad, if not worse than Futaba! Do all the Spektrums have similar slots? Fortunately, my (very reliable and cheaper) Orange Rxs have plain rectangular slots. Quote Link to comment Share on other sites More sharing options...
BackinBlack Posted December 19, 2020 Share Posted December 19, 2020 Yes, the chamfers are standard. They're designed to aid correct orientation of plugs, not quite as bad as Futaba, I would say, which also have a sort of flange on one edge of their plugs. Quote Link to comment Share on other sites More sharing options...
Chris Walby Posted December 19, 2020 Share Posted December 19, 2020 Hi, I just carefully dress the end of the servo plug or extension lead plug with a needle file to help it into the TX, bit of a pain but I don't think they will ever fall out! Considering I don't swap RX's between models I don't think its an issue although interestingly the new RX's don't seem to have this feature.. Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted December 19, 2020 Share Posted December 19, 2020 Like the guys said Tosh, just a second or two scrape along the edge of the servo plug helps a lot with using other brands of servos and extension leads. A little less butchery than required for Futaba plugs. For me the bigger issue is always denoting which is the signal, negative and positive pins. Quote Link to comment Share on other sites More sharing options...
cymaz Posted December 19, 2020 Share Posted December 19, 2020 Posted by leccyflyer on 19/12/2020 20:19:46: Like the guys said Tosh, just a second or two scrape along the edge of the servo plug helps a lot with using other brands of servos and extension leads. A little less butchery than required for Futaba plugs. For me the bigger issue is always denoting which is the signal, negative and positive pins. THIS might help THIS as well Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted December 19, 2020 Share Posted December 19, 2020 I've no problem with which servo lead is positive, negative and signal - it's the markings, or lack of, on so many receiver cases. Quote Link to comment Share on other sites More sharing options...
Piers Bowlan Posted December 20, 2020 Share Posted December 20, 2020 Posted by leccyflyer on 19/12/2020 23:32:00: I've no problem with which servo lead is positive, negative and signal - it's the markings, or lack of, on so many receiver cases. +1 Quote Link to comment Share on other sites More sharing options...
cymaz Posted December 20, 2020 Share Posted December 20, 2020 Posted by leccyflyer on 19/12/2020 23:32:00: I've no problem with which servo lead is positive, negative and signal - it's the markings, or lack of, on so many receiver cases. Apologies, misunderstood the question. After looking through some Spektrum photos, they do put a very small legend on the box but you really need good eye sight to see it The pin legend is just below BND/DAT. Quote Link to comment Share on other sites More sharing options...
cymaz Posted December 20, 2020 Share Posted December 20, 2020 Very small Edited By cymaz on 20/12/2020 07:06:29 Edited By cymaz on 20/12/2020 07:11:13 Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted December 20, 2020 Share Posted December 20, 2020 Indeed - you need very good eyes or a magnifier to see those markings. Other, non-Spektrum manufactured receivers have no markings whatsoever. Quote Link to comment Share on other sites More sharing options...
Doctor Chinnery Posted December 20, 2020 Share Posted December 20, 2020 It appears there might be a market for small self adhesive labels to pop on your receivers with just s + - printed on them to help those of us who need our reading glasses to actually make out the tiny lettering on some receivers. It's not really a problem when you're doing something at home but down at the field is a different matter altogether. Quote Link to comment Share on other sites More sharing options...
David Davis 2 Posted December 20, 2020 Share Posted December 20, 2020 I've found that the negative wire always goes to the pin on the outside of the receiver case on both Spektrum and Futaba receivers. Quote Link to comment Share on other sites More sharing options...
cymaz Posted December 20, 2020 Share Posted December 20, 2020 I’ll find some more and post them up... Quote Link to comment Share on other sites More sharing options...
cymaz Posted December 20, 2020 Share Posted December 20, 2020 Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted December 20, 2020 Share Posted December 20, 2020 Posted by David Davis 2 on 20/12/2020 07:48:32: I've found that the negative wire always goes to the pin on the outside of the receiver case on both Spektrum and Futaba receivers. That would be good if it were correct, but Cymaz's pictures of the AR8000 and AR410 show that isn't the case - they are the opposite way around. Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted December 20, 2020 Share Posted December 20, 2020 Not sure about the AR9020 RX, but some of the Spektrum receivers I have (early ones) have a very tight pin spacing and some servo plugs are difficult to squeeze in. Jeti and Multiplex are a couple of examples of how it should be done. Most MPX receivers are set up to accept Futaba plugs as standard so no need to trim the plugs. Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted December 20, 2020 Share Posted December 20, 2020 That's done properly on those Jeti and Multiplex rx. Quote Link to comment Share on other sites More sharing options...
cymaz Posted December 20, 2020 Share Posted December 20, 2020 Posted by leccyflyer on 20/12/2020 08:26:05: Posted by David Davis 2 on 20/12/2020 07:48:32: I've found that the negative wire always goes to the pin on the outside of the receiver case on both Spektrum and Futaba receivers. That would be good if it were correct, but Cymaz's pictures of the AR8000 and AR410 show that isn't the case - they are the opposite way around. Just going by the pictures....I'm not a spektrum user. I plead ignorance!! Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted December 20, 2020 Share Posted December 20, 2020 Posted by David Davis 2 on 20/12/2020 07:48:32: I've found that the negative wire always goes to the pin on the outside of the receiver case on both Spektrum and Futaba receivers. They do, as the negative is a common line of track on the outer perimeter of the pcb board Quote Link to comment Share on other sites More sharing options...
Dickw Posted December 20, 2020 Share Posted December 20, 2020 Posted by Denis Watkins on 20/12/2020 10:13:37: Posted by David Davis 2 on 20/12/2020 07:48:32: I've found that the negative wire always goes to the pin on the outside of the receiver case on both Spektrum and Futaba receivers. They do, as the negative is a common line of track on the outer perimeter of the pcb board I think the point being mades was that with an "end pin" type Rx, both the negative and the signal pins are next to the outside of the case! Dick Quote Link to comment Share on other sites More sharing options...
Tosh McCaber Posted December 20, 2020 Author Share Posted December 20, 2020 Thx for the ongoing discussion. Like Frank, I think that the slots on the Spektrum AR9200 seem very tight, as well as having larger wedges than the new Spektrum Rxs, like the AR410 in the picture above. I've chiselled the flanges of Futaba plugs before, with no trouble, but these are a different matter- maybe have to buy some (overpriced) Spektrum servos!! Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted December 20, 2020 Share Posted December 20, 2020 Tosh - they are very tight, but I find that just taking a new scalpel blade and scraping that a couple of times down each edge replicates the chamfer that the Spektrum servos have. They will still be quite tight, but they will fit. Quote Link to comment Share on other sites More sharing options...
Tosh McCaber Posted December 20, 2020 Author Share Posted December 20, 2020 Thx Leccy, My pal Norrie suggested that I go out and buy a bunch of Spektrum bare plugs, pull out the pins from the existing plugs on the servos that I intend to use, and substitute the Spektrum plugs for them. However, knowing me, I'm feart and would probably make a hash of it! See you on the field after, or before New Year? Quote Link to comment Share on other sites More sharing options...
David Davis 2 Posted December 20, 2020 Share Posted December 20, 2020 Posted by leccyflyer on 20/12/2020 08:26:05: Posted by David Davis 2 on 20/12/2020 07:48:32: I've found that the negative wire always goes to the pin on the outside of the receiver case on both Spektrum and Futaba receivers. That would be good if it were correct, but Cymaz's pictures of the AR8000 and AR410 show that isn't the case - they are the opposite way around. I don't think they are. Quote Link to comment Share on other sites More sharing options...
leccyflyer Posted December 20, 2020 Share Posted December 20, 2020 Assuming that the label is on the top surface of the AR8000 and the bind button is on the top surface of the AR410, the black wire, as shown, is on the bottom pin of one and the top pin of the other. Quote Link to comment Share on other sites More sharing options...
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