HENRY GELSTHORPE Posted August 6 Share Posted August 6 (edited) Hi, Considering getting a Frsky xjt module for my Radiomaster tx16s.Does the the module come as ver 2 of accst or previous version?, also can the version be firmware upgraded? Edited August 6 by HENRY GELSTHORPE WRONG SPELLING Quote Link to comment Share on other sites More sharing options...
Andy Gates Posted August 6 Share Posted August 6 Not quite sure of the reason behind the question. I assume your TX16s has the multi protocol module fitted internally, so why would you want a second one fitted? The module will take a firmware update so it can be changed to which ever version you require. Quote Link to comment Share on other sites More sharing options...
HENRY GELSTHORPE Posted August 6 Author Share Posted August 6 (edited) Thanks Andy for your reply, the rationale is that I am going to stick to frsky receivers, and I would not have to go through the fine tune process. Also this Edited August 6 by HENRY GELSTHORPE more info Quote Link to comment Share on other sites More sharing options...
Andy Gates Posted August 6 Share Posted August 6 The fine tune is not really an issue, certainly not worth putting another module in at the price they are. I keep a record of the various receivers I use and once fine tune has been done on a particular version of receiver I use the same fine tune setting on the others of the same version. Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted August 6 Share Posted August 6 Yes, that's right - just once per rx model and the mpm firmware is easily updated Quote Link to comment Share on other sites More sharing options...
HENRY GELSTHORPE Posted August 6 Author Share Posted August 6 I am puzzled how to fine tune non telemetry type Frsky receivers, as the tuning process involves telemetry. Does tuning a telemetry type Frsky receiver automatically establish the required settings for say a non telemetry receiver, or indeed all Frsky receivers providing they meet the accst protocol? Quote Link to comment Share on other sites More sharing options...
Outrunner Posted August 6 Share Posted August 6 13 minutes ago, HENRY GELSTHORPE said: I am puzzled how to fine tune non telemetry type Frsky receivers, as the tuning process involves telemetry. Does tuning a telemetry type Frsky receiver automatically establish the required settings for say a non telemetry receiver, or indeed all Frsky receivers providing they meet the accst protocol? No telemetry involved. You plug a servo into the receiver and adjust the transmitter output until the servo just stops responding in both + and - ranges. Not a good explanation but looks it up on YouTube. Quote Link to comment Share on other sites More sharing options...
John Wagg Posted August 6 Share Posted August 6 (edited) 18 minutes ago, HENRY GELSTHORPE said: I am puzzled how to fine tune non telemetry type Frsky receivers, as the tuning process involves telemetry. Does tuning a telemetry type Frsky receiver automatically establish the required settings for say a non telemetry receiver, or indeed all Frsky receivers providing they meet the accst protocol? You don't need telemetry to fine tune. The LED light on the receiver will go out (or change colour) when it looses the Tx' signal. So adjust "fine-tune" one way until the LED goes out. Do the opposite way and then set the midpoint. Edited August 6 by John Wagg Quote Link to comment Share on other sites More sharing options...
HENRY GELSTHORPE Posted August 6 Author Share Posted August 6 Well that seems logical, thank you for your replies, so within the Frsky series of receivers does one setting apply to all variants or not ? anybody tested two differnt variants and did you need different tune values. Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted August 6 Share Posted August 6 You need to fine tune for each model of receiver....... Quote Link to comment Share on other sites More sharing options...
Andy Gates Posted August 6 Share Posted August 6 As GG says. So as an example, a G-RX6 may have a different setting to a G-RX8, but all G-RX6 will require the same setting from my tests. Quote Link to comment Share on other sites More sharing options...
Wookman Posted August 6 Share Posted August 6 If you have Uni Firmware on the rx will that not self tune during the bind process to the Tx? Quote Link to comment Share on other sites More sharing options...
HENRY GELSTHORPE Posted August 6 Author Share Posted August 6 38 minutes ago, Andy Gates said: As GG says. So as an example, a G-RX6 may have a different setting to a G-RX8, but all G-RX6 will require the same setting from my tests. That then begs the question how would the frsky xjt module cope with different receivers, if different receivers require tuning? Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted August 6 Share Posted August 6 I thought the uni firmware was to cope with different firmware versions, and not to deal with any hardware variations..... so I'd be surprised if it changed anything on the tx. Nice if it did though.... Quote Link to comment Share on other sites More sharing options...
Mike Blandford Posted August 6 Share Posted August 6 The crystals used by FrSky for the RF devices on both Tx modules and receivers have a tight tolerance. As a result they always work well together. There is some slight variation, and UNI firmware on the Rx does tune the frequency used on the Rx to match the Tx to get the absolute best performance. The frequency tolerance of the crystals used by RadioMaster (and others) on the multi module is much less tight, requiring the use of the tuning function on the Tx to bring them into alignment (I need a setting of -40 on one module and +40 on another!). In my opinion, multi modules (used with FrSky) should be tuned to match the frequency used by FrSky modules. This may be done by tuning to any FrSky receiver running FrSky firmware. The tuning should then be OK for all FrSky receivers. While UNI firmware will tune to multi modules that are a long way off tune, the module is then using hopping frequencies that are off from where they should be. If only UNI firmware receivers are available, bind to a receiver, use the UNI statistics script to find what the receiver has detected for the tuning, then set the tuning on the Tx to the negative of this value, then bind again and check the UNI tuning value is close to 0. UNI firmware also monitors the packet transmission rate from the Tx and synchronises with it. If the signal is lost for about 0.9 seconds, then failsafe is entered. With FrSky firmware, the Rx then enters a searching mode trying to find the signal again. This can take half a second or more. UNI firmware, being still in sync with the Tx, follows the hopping frequency sequence for another 4 seconds, so regains the signal quickly. After this time, synchronisation cannot be guaranteed so UNI also enters searching mode. Mike 1 1 Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted August 6 Share Posted August 6 Smart stuff Mike. Quote Link to comment Share on other sites More sharing options...
HENRY GELSTHORPE Posted August 7 Author Share Posted August 7 Thank you Mike for the definitive answer. Quote Link to comment Share on other sites More sharing options...
GrumpyGnome Posted August 7 Share Posted August 7 The 'official' mpm view is here... https://www.multi-module.org/using-the-module/frequency-tuning Can't see any mention of uni firmware..... but I didn't read it all! Quote Link to comment Share on other sites More sharing options...
Mike Blandford Posted August 7 Share Posted August 7 That description almost certainly pre-dates the existence of UNI firmware. Only UNI firmware does tuning at the Rx end. If using UNI, use the method I described above. Mike 1 Quote Link to comment Share on other sites More sharing options...
HENRY GELSTHORPE Posted August 8 Author Share Posted August 8 Well, that seems to have made me aware of developments in the muddy waters of Frsky🤪. On a more pressing issue there seems to be a shortage of xjt modules, did Frsky cease or limit production. Does anybody know of a source to obtain one please? Quote Link to comment Share on other sites More sharing options...
Mike T Posted August 12 Share Posted August 12 I asked Richard at T9 what the situation was. No longer produced. His only suggestion was to find a JR module bay adaptor so an XT lite module could be fitted. I bought my first FrSky module when Rob Carpenter ('Giant Cod') first imported them back in the 2000's. They were great (as a company) for a few years, until they adopted the US business model of establishing a customer base then sticking it to them. Quote Link to comment Share on other sites More sharing options...
HENRY GELSTHORPE Posted August 13 Author Share Posted August 13 Mike T, thanks for your reply, I have in fact managed to source one EU LBT variant presumably accst ver 2 . I went on Frsky's website and clicked on the XJT module, it is not showing out of production.The site gives a list of venders ,the only one with stock was HorusRC.com a Chinese site, which I suspect is a subsidery of Frsky.Perhaps Frsky wanted to deal directly ? Quote Link to comment Share on other sites More sharing options...
Mike T Posted August 13 Share Posted August 13 Thanks for the info., Henry. I've ordered one as well! 🙂 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.