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1  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: February 10, 2013, 06:28:59 pm
Thanks, when I saw the video i was like.. ouch! :S That was nasty. Glad you managed to retrive the gear.
I do like the OSD layout, the AHI seems to work quite well too.

I looked into the RFM22B docs, and they mentioned a RF switch.
Eventually I found that switch that works on 459Mhz and the design was rather simple. (making it work may prove different)
2  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: February 08, 2013, 12:30:11 pm
The option to save the models memories is with the PC tool EEPE (http://code.google.com/p/eepe/).

True, I was forgetting that. When I'm testing the gear at home I often have the radio next to the WiFi router but FrSky does hopping so it doesn't get too much into
the router. Now a vTX static in one frequency emitting with 500mW...
For video I've been using 900Mhz up to now, but I'm goign to try 5.8Ghz because the antennas are smaller and easier to fit in the multicopters.

I got a HK Mini OSD, it's using some custom FW. The problem is that they have a AtMega88, so there is very few space. I've loaded in mine the alternative FW cl-osd and it runs fine but even tried to port the arduino OSD code from Dennis @ RCG but was no good due to the size.
But the version with GPS is pure trash... including me I saw several people where the wires in the GPS were loose of badly soldered. I had to open mine to fix it.

I did saw. I actually got one... and I don't want to talk about it!  smiley-cool
Such a headache, my goal was more the TX as it fits nicely in the radio but it was a headache, tons of problems... eventually found out that during assembly someone
dropped a ball of solder on top of the RFM22B of the RX. smiley-sad
And I'm not the only one having problems, all sorts happening mainly due to bad soldering work.

Btw, have you ever tried the antenna diversity in the RFM22B? I was thinking in making a PCB with 2 antennas. It will require a RF switch.
3  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: February 07, 2013, 10:02:21 am
Do you already have a different firmware or you're using the stock one?

Between different versions of er9x or open9x is possible to save them and after re-upload. I do that every time I update it just in case.
But try with the eepe tool it might even be able to save the ones from the stock fw.

Ehehe that is funny. smiley
What's the power on that 2.4 vTX??? I also have helis (several... ) but never even tried to put FPV in them. For me FPV just in multicopters
with the tricopter been the best due to the fast tail response.
At the moment all the fun is going to my micro quad I converted to FPV:
I'm using a really old 1.3Ghz vTX so the range is super short and really bad video.

About the OSD I'll check it out, I have two E-OSD from HK and I'm using that but was considering getting one of the Arduino based ones with the
MAX7456. Last month almost lost my quad when I flew way out and got lost. smiley-sad
Btw, what tool did you used to overlay the OSD in the video? Or was just normal video overlay?
4  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: February 05, 2013, 04:24:37 pm
Been using it for some time but just realised I had forgot to share here. smiley

Added support for output FrSky telemetry code from the TX module, so that I can use it with my modded 9X radio and see the RSSI levels from both RX and TX.

The yellow wire (seen in the picture above) goes from the pcb TX pin into the 2nd pin that after the radio mod works as RX for the FrSky module.
At the moment is only sending that data, but could potentially send anything that FrSky telemetry provides.
5  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: January 18, 2013, 10:17:34 am
Are you planning FPV?

My next step was to add RSSI out, probably use Timer2 to generate a 50hz pulse.
So it can either be used directly with some OSD's or with the buffers commonly used with FrSky and others RX's.
6  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: January 16, 2013, 06:33:55 pm
One update on the testings.
Last weekend tried it with the power set to 20dbm and indeed the range is nothing compared to before.
The day was not the best, cold, wet grass and foggy so definitely not the best conditions for RF, still it
went up to 350m with signal and I just didn't went more coz I was freezing. smiley
7  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: December 11, 2012, 12:51:11 pm
You can change normally using the registers. It can work all over the full range allowed by the SIL chip.
What happens is that hoperf adds some filters that will make it work better on model range. So don't expect to have the same
performance on 866Mhz if you're using a model for 433Mhz.
Example, for the purpose of acting as a frequency scanner is it ok for a LRS I'd stick to the model frequency to get the maximum performance.

8  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: December 01, 2012, 10:37:31 am
I've disabled the jumper check code, so it's always using the same power.
What I had forgotten to do was check the initialization settings on the TX.

As for the power regulator I recalled I had here a tiny pcb with a voltage reg from a old Wireless camera kit.

Couldn't be better, it converts from 12v to 5v and has place to solder two more wires that I'm using for the PPM and Serial TX.
It's a 78L05 so It's pushing it a bit, but I let it on for quite some time and it didn't burnt.
9  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: November 29, 2012, 05:38:54 pm
arghh... thanks for that!

I remembered seeing that code but when checked I saw that it was using the full power, 20dBm!
Problem was I checked on the RX and forgot to check on the TX side, so yes I was only using 1dBm
on the TX side. ;-)
If the weather keeps good, I'll test it again with more power.

PS: What have you used to power the TX module? Both Futaba and 9X output 12v so it needs to be converted. For testing I ended up using a ESC+LiPo. So I was wondering if you have a new board layout that includes a voltage level converter.
10  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: November 29, 2012, 11:16:28 am
Just a video showing the maiden flight. smiley
Next step is to make some proper antennas, you can hear the drop packets beeps (as well as me speaking loud).

11  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: November 24, 2012, 02:26:53 pm
I'm using the er9x, but I think open9x will work as well they use the same mods for telemetry.

In multicopters and for FPV I just love the tricopter, the super responsive tail makes it really fun to fly.
If you need any details just let me know.

I'm trying to determine with platform will be the one making the first test running the LRS. smiley
12  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: November 22, 2012, 05:56:37 pm
...and it's fixed! smiley
Took some ideas from openLRS code and ended up only using Timer1 as overflow interrupt.
I'll be submitting the updated code soon and start adding a failsafe feature.


Update1: Code submitted and video made of the test  


Update2: FrSky telemetry support added. RSSI+Voltage levels working on a modded 9x radio.
13  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: November 21, 2012, 05:59:36 pm
There you go: http://code.google.com/p/zlrs/source/browse/#git%2Frf22_RCrxHWS_tele

I prefer GitHub but I decided to give a try to Google Code GIT hosting.


Got some time today to look into this, seems the way I've set it is consuming too much time not allowing the RF22 to process data.
I've changed the timer to only trigger and even on the pulse shift and the RF22 started to work. Now I need to correct the PPM output as it's not been generated correctly.
14  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: November 19, 2012, 06:44:05 pm
Here it is: http://code.google.com/p/zlrs/

That version the PPM sum runs fine on pin D8, perfect 18ms like FrSky but no RF22...

This is the output from a FrSky D4FR


And this is from the code of the LRS


The channels interval is showing the ~1500ms the default value I've set because it can't get data from the RF22.
15  Community / Exhibition / Gallery / Re: Cheap UHF spectrum analyzer (and RC tx rx) using RFM22 module on: November 19, 2012, 01:33:00 pm
Thanks, I noticed that you're not using the latest version of RF22 so I wanted to check the changes to port it to the latest version.

My PPM code it running fine on it's own, I set some static values and the signal generated is clean. I matched the time intervals to what FrSky receivers do. (I'll post some screenshots later)
Is still not optimal as I lock it during the signal generation, but I saw a good example on how to release the control between the intervals of the pulse shifts. As soon as I made the current model work I'll try the better one.

I'll create a Google code page later and share it there.
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