Converting a XJT into an XHT for vintage radios

[bracesport]

@gp49 - it says here that the Xht is for non-JR radios? Or is that for JR radios with a module bay - my radio is a JR X378

 

[Jay1977]

I have the JP4in1 - external and internal versions.

I had a look at the FRsky XJT lite, would that be a good module to get?

View attachment 4893

Either one will work. You just need the PPM, voltage and ground coming from the TX and from the 4 in 1 module. Connect the 3 together and thats it. I have used spektrum, frsky and did a dragon link for a buddy. All 3 worked the same. Your JR radio wires will be going to the 72 board. It will either be, red, black & yellow or red, and 2 white wires. Youll have to check to see which white wire is ground and which is ppm. You dont need a diy module to make it work any module will work. I posted a couple pics of my JR X7202 with the XJT in it a page back. If you need more pics just let me know. I do have another XJT module thats apart and the 3 wires attached if you think that will help ill take pics of it when i get off work.

 

[bracesport]

thankyou so much! I will get myself another module and go from there!

 

[gp49]

@bracesport Happy to spend your money!

Icing on the cake would be to find a discontinued Frsky Dashboard display to go with the new module... (I see them on rcgroups and ebay from time to time)

 

[Jay1977]

@bracesport Happy to spend your money!

Icing on the cake would be to find a discontinued Frsky Dashboard display to go with the new module... (I see them on rcgroups and ebay from time to time)View attachment 4902

Ugh i am in need of that so bad. Lol ?

 

[Jay1977]

@gp49 - thankyou so much! I will get myself another module and go from there!

You dont need to buy another module, unless you just want one. If you do buy another get either the XJT or the new DIY version of the XJT, the XHT. If you get one and still need help figuring it out id be glad to help. Im doing more tinkering with old JR radios than flying these days. ??

 

[Warthog]

I just ordered the XHT module for my Futaba FP-3FN. Can I just ignore the s-port wire on the XHT and just hook up the pos, neg, and PPM?

 

[Wayne]

You sure can.

The S-port will be used if you need to do any updates in the future, and it can also be used to grab the telemetry data should you want to do that in the future.

 

[Warthog]

You sure can.

The S-port will be used if you need to do any updates in the future, and it can also be used to grab the telemetry data should you want to do that in the future.

Great, thanks!

 

[John in Boston]

If you're a Facebook user, there's a helpful ongoing discussion group called 2.4 ghz conversions of older 72mhz radio control transmitters.
As a bare minimum, the photos are a total candy store of vintage "stuff"!

NB: Apparently the group is categorized as "Private", so permission from its administrator is required. Getting in is no big deal -- and worth it.

 

[Warthog]

So I've got the XHT module hooked up and working, but I have a question about range checking. According the manual, to range check, you do the following:

press the F/S button on the XHT module for 4 seconds to enter range check mode, the RED LED will be off, GREEN LED will flash rapidly.

In practice though, the red LED turns off, but the green LED stays constant (see picture). I think it's in range check mode, but not 100% sure. There's a heck of a lot of beeping going on when it's in this mode, but it almost seems random, even after looking at the codes in the manual.

Also, the module seems to make both high pitched beeps and low pitched beeps, but there's no explanation of the difference between the two in the manual. Any idea?

 

[p51d]

Hello all, I'm new to this forum. Have a problem, hope you can help. I have a 78 Kraft 5C I converted last year with a DHT and using a V8FR-II receiver. It works well. I decided to try the new XHT module, got one last week, wired it in. The receiver will not bind. The XHT module switches are set to switch 1-on and switch 2-off for DH8 Mode as per directions. The module flashes red light with green light on steady when put into bind mode so it seems to be working, but red led on the receiver does not flash when it is put into bind mode, it stays solid red. When I bind the receiver to one of my other DHT converted transmitters it works fine. I did not hook the green wire from the XHT module to anything as I am not using telemetry. What am I doing wrong? Any help would be appreciated. (I have tried putting the switches in other modes, just to see what happens, but still not getting it to bind to the receiver.)

 

[Retired]

Interesting? I did the original conversion of a XJT module into a XHT for Wayne at Aloft originally as a proof of concept project to hopefully get Frsky interested. It seems our work on it did that since there’s now a official XHT solder in. I had no issues binding to a D8 or D16 receiver with my modified version XHT. I haven’t got the new XHT to try out so I’ll guess. Is it possible Frsky decided to not support the D8 series receivers with this XHT? Can you try a D16 receiver to see if it binds?


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[Wayne]

To bind the V8FR-II you will need to use a jumper to put it into D8 emulation mode. The XHT will need to be in D8 mode also. Once bound you can remove the jumper from the receiver. That should do the trick for you.

 

[Retired]

To bind the V8FR-II you will need to use a jumper to put it into D8 emulation mode. The XHT will need to be in D8 mode also. Once bound you can remove the jumper from the receiver. That should do the trick for you.

Hi wayne, thanks for sorting that out. It would seem Frsky did respond to the need for a xht. Any idea if we helped with that with ours?



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[Wayne]

It would seem Frsky did respond to the need for a xht. Any idea if we helped with that with ours?

Hard to say, they had been talking about it for years. But I did share the posting with them, and I think they saw people were interested in it, so yeah, I'm sure it helped!

 

[Warthog]

I did not hook the green wire from the XHT module to anything as I am not using telemetry. What am I doing wrong?

The green wire is the PPM wire. The yellow wire is for telemetry. So that might be a problem. Follow the color codings printed on the case, and not the order that the wires emerge from it.

 

[p51d]

Thank you all. I do not have a D16 receiver. I put my V8 into D8 mode. The receiver now comes up with a green light, but the XHT has both a solid green and red and I'm not getting any control surface action. I'll switch the green and yellow wires tonight and let you know. Thanks again

 

[p51d]

Good news, we are up and running. Hooked the green wire from the XHT to the ppm wire in the transmitter (yellow wire in the Kraft) and put the receiver in D8 emulation mode (jumper across the signal posts of the first 2-channels during binding), and we have working servos. I noted that both the red and green light stay continously lit (neither flashing) on the module when working. Thanks again for the help, on to the next one.

 

[Tomthumb]

Hi guys and thanks for having me on the forum.

Let me start by saying that I am definitely not a tech guy so please be gentle with me.
A bit late finding this post but I am considering replacing my DHT module wired into my Multiplex 3030 with the new XHT.I have noticed that the XHT has smartport but does anyone know if under the shrink wrap there is anything that resembles the serial port pins (4) that protruded from the side of the old DHT module? Or even on the XJT?

I have used this port to connect a FLD-02 display and was eventually planning to use to connect a Bluetooth module.I have read several posts saying that XHT is just a decased XJT but it looks like they have removed the serial port in the process. Anyone opened one up yet?
I have been told that the serial port wouldn't be of any use if I wanted to use newer receivers (D16).I have only used D series receivers up till now with my existing setup.