Upgrade and mod a hubsan x4 h107d
- Thread starter Xeon
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Jackson
USA member at large
If you are talking about the main TX, the toy transmitters I have just have a stub of wire attached, core only no ground (same with the RX in the quad body). 2.4Gh works in multiples of 31mm (31.25 to be exact). These stubs are usually jammed inside and are seldom the correct length. Easiest way is to just extend the existing wire. Strip off a bit of insulation and solder.
I just use some solid 18AWG I have. Then bring it out of the controller and cock it one way or the other. Do reinforce the wire inside at the PCB with some hot glue for stress relief. I also cover the whole assembly with shrink tubing.
This went from less that the proper 1/4 wave (~28mm) to a nice measured 3/4 wave (93.75mm.)
Also hot glue where it comes out.
I just use some solid 18AWG I have. Then bring it out of the controller and cock it one way or the other. Do reinforce the wire inside at the PCB with some hot glue for stress relief. I also cover the whole assembly with shrink tubing.
This went from less that the proper 1/4 wave (~28mm) to a nice measured 3/4 wave (93.75mm.)
Also hot glue where it comes out.
As i tried to make clear in my previous post, this is exactly what i've tried so far. At least we agree haha. I don't know wich point to try next. It seems clear the transmitter is working perfectly because i'm able to fly. Unfortunately the signal isnt transmitted by the antenna, causing a loss of signal at a few feet distance
@Jackson the h107d transmitter does have a connection to ground with stock antenna. Nice info about the antenna length, will definitely look into that when i got this up and running. Thanks!
Jackson
USA member at large
Well I just looked. I found this pic.
That little squiggle is the antenna and is not grounded as far as I can tell. It's just a different (but more consistent) approach to the usual wire stub most use. The 5.8Gh on the right is an official coax cable with grounding. Assuming the squiggle is a proper 1/4 wave length (probably is) simply tacking on more wire (red line) in 31.25mm increments will do the trick. Adding 93.75 mm should give you a full wave which is all that is needed. I can't figure the scale in the pic, but if the length is not enough to get outside this should also work.
Maybe there are different revisions of the PCB, but for this one my simple method will work.
In my original post the simple wire add-on made a significant difference in range.
Good luck on your modding.
Wow, i don't have a clue where you've found that pic. This means the OP of this topic might not be entirely correct?Well I just looked. I found this pic.
That little squiggle is the antenna and is not grounded as far as I can tell. It's just a different (but more consistent) approach to the usual wire stub most use. The 5.8Gh on the right is an official coax cable with grounding. Assuming the squiggle is a proper 1/4 wave length (probably is) simply tacking on more wire (red line) in 31.25mm increments will do the trick. Adding 93.75 mm should give you a full wave which is all that is needed. I can't figure the scale in the pic, but if the length is not enough to get outside this should also work.
Maybe there are different revisions of the PCB, but for this one my simple method will work.
In my original post the simple wire add-on made a significant difference in range.
Good luck on your modding.
I'm planning on hooking up an wireless Internet antenna, do you have any information on how long the signal wire in the inside of the plastic antenna is? (maybe this isn't possible because the wire might be too long? Or is it possible to double the length?)
Based on your information, I just have to connect the signal wire and leave the ground of the antenna unconnected?
Many thanks for helping me out, both of you. I really appreciate it!
The pineapple anteana made for rouge routers would be great.
Burntcarcus
Member
Has anyone seen a mod for making the camera point more level rather than at the ground? I have a new camera board on the way as well as a whole new h107d but without handset. Would really love to have a go, see if I can figure something out. Im watching this thread intently as extra length is always good lol
Jackson
USA member at large
The OP showed a pic of an attempted mod using a standard antenna with coax. I really don't know how attaching just the core of the coax will work and how that will affect the wave length without grounded shielding.
Hi to everyone, I'm new to this forum. I came across this thread so I thought that I would post the following. I have two h107d's, each of them came with a tx remote control. One of the h107d's works as it should, but the other does not. I new that the other did not work properly when I bought it so It's not an issue. I got it for spares. The interesting thing is that the circuit boards in the tx remotes have different version numbers. One has a version number v2.2 and the other has a version number v2.3. I've only had a quick look at both the boards and the only major difference that I can see is that the v2.3 has a 2.4 ghz antenna which is similar to the antenna that is fitted to the quad. the antenna is fitted inside of the housing of the transmitter case and is mounted horizontally. The etched antenna is still there, but it is no used. In fact it appears that it is not connected at all. If anyone else has a v2.3 then can they confirm that it has an antenna as I have described.
I would imagine that it would work either way, just an improvement to the range.
I may have found the answer to my question on a youtube video that I came across tonight. I'm not sure if I'm allowed to post youtube links so I do so at my own risk. It may prove of use to others with older versions of the TX radio. In the video the 2.4 ghz antenna is located in the square foam block which is located in the top left of the case. If you look carefully you can follow the coax down from the antenna to the location on the pcb where it is soldered. On my radio the etched antenna is not connected to the antenna circuit as a component has been left out. The 2.4 ghz antenna is mounted horizontally. The TX radio in the video shows it as a V3.1. It also indicates that they TX will run on a voltage of between 4-13 volts as mine does.
Are you sure about thinner track being the antenna? Here is the datasheet for A7105 transceiver http://d1.amobbs.com/bbs_upload782111/files_37/ourdev_624976V4QBXF.pdf
and on page 65 there is a application diagram. 4th pin is supposed to be leading to the antenna, so these guys seem to be correct.
Ok, i got it - pin 3 is RFI - radio frequency IN, not out. If you're going to extend its range as TX, you're supposed to use pin 4.