Dodgy Posted January 3, 2009 Share Posted January 3, 2009 Hi All I am new to flying - in fact I subscribed to mag a year ago and been reading and collecting parts to build my first trainer for nearly a year...slow progress but learnt lots before getting in to the air. Finally got 90% of the stuff I need for my first plane .Although I have a coax heli which I have mastered.My question is that I have a Sanwa RD6000 Sport and are trying to use it with a 6 channel ESKY Rx, with ESKY Cystals. when I power up all the servos go completley mad and are moving all the time.I set the Tx to PPM and have been through the Tx manual to no avail. I have an ESKY 4 channel Rx which works with this Rx ok with no glitches..... Have I got the wrong Rx for this Tx ( I read eleswhere maybe the Crystals need to be Sanwa - but as an electronics enginner surely a Crystal is a Crystal?)As you can understand I don't want to take to the air with a dangerous system Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted January 3, 2009 Share Posted January 3, 2009 You've hit the nail on the head, you need a Sanwa Tx crystal in a Sanwa Tx, same goes for the Rx's always fit a Sanwa Rx crystal in a Sanwa Rx, Futaba Rx crystal in a Futaba Rx etc. unless the manufacturer advises otherwise.The crystal frequencies are set to work with the modulating circuitry in that manufacturers electronics, so the multiplication factor is different in different brands.No problem using a Sanwa Tx with another brand Rx on PPM though, just make sure you use the respective manufacturers Tx and Rx crystals. Quote Link to comment Share on other sites More sharing options...
Dodgy Posted January 3, 2009 Author Share Posted January 3, 2009 Thanks for your inputI've searching 'tinternet for a while and kinda came to the same conclusion - guess the actual frequency of the crystal is different to what is written on the tape.My Sanwa set came with one Tx crystal marked "85" and I was using a pair of ESKY "80" Tx Rx xtals which did not work. Peeling off the labels revealed no marks on the case to say the actual osc freq (most xtals I've come across have had the freq stamped on the case). If these were stamped then I might have twigged.Am I right in thinking the Tx / Rx Xtals actually osc at different mhz ? Like the Tx being multiples higher than the desired ? Looks like I am shopping for xtals now but found DX6i sets for under £100 now very tempting Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted January 3, 2009 Share Posted January 3, 2009 Re Tx/Rx Xtals, yes they are different and Futaba make single conversion and dual conversion Rx's and these need different crystals as well.I have a DX6i and no complaints, no crystals either, but a bit more than a Sanwa Tx crystal though. Note Dx6i comes with dry cells so you may need to budget for this as well, but it's a very good set and easy to program. Quote Link to comment Share on other sites More sharing options...
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