459MHz UHF legal Tx and Rx - Arduino based programability.

thundead · July 29, 2011, 10:13:00 AM

Quote from: Devonian on July 29, 2011, 10:01:03 AM
Pretty neat Mihai.
What's not so clear in the video is that you are actually getting the Rx RSSI from the Tx module via telemetry.
Goes to show that the Rx is a Tx at the same time - actually a transceiver (and so the Tx is also an Rx).

I cannot test anything for the next week (regarding the 3v3 Tx pin having 10v on it), but if you register on the Flytron forum and make a post in the OpenLRS section, I'm sure you will get some responses pretty quick.

Now all you need to do is put the LCD code in the Tx code to use the onboard Arduino, then there's no need for the external Mega.

Nigel.

Morning Nigel,

Yup, the RX rssi is via telemetry.
The LCD code was running off the tx module, I used the Mega just to power it up (since the +v pin on the tx would have fried my lcd).

I'll post the problem in the Flytron forum aswell and see what's going on.
Have a nice holiday and we'll see what I can cook up untill you get back :0

Mihai.

thundead · July 30, 2011, 12:05:19 AM

Right, so here's the range check as promised :

My tx setup : My Futaba FF9 + OpenLRS + Sony Vaio UX1XN for reading tx,rx RSSI

OPEN LRS: 459 Mhz <<< thanks again Nigel!

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I tried two antenna setups:

1. Stock Tx, Stock Rx
2. 1/2 Wave Tx, Stock Rx
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1. All Stock
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On stock antennas I managed to get about 200 using the low power mode ( turning tx on with button pressed)

On full power, I managed to get 617m but with a pretty glitchy RX signal.

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2. 1/2 Wave Antenna on TX / Stock on RX
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After changing the antenna on my tx went for another go hoping to see some improvements in range.

So started walking....

300m ok .... passed the 617m ... rock solid signal ....

Finally ran out of space (end of the Aberdeen beach haha) at 1200m.

Checked the servo movements aand :o :o :o :o no glitches!!! . The RX was still receiving enough packets for a quality connection. Apparently the TX was beeping from time showing that two packets were lost occasionally but still!!!! I think it can do much better.

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here's a comic of the range test haha

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Conclusion:
System works well @ 459Mhz
Stock antennas MUST BE CHANGED!!! specially the tx one.

Anyway, more than happy with the results.

Next step: failsafe + test fly :D

Any questions, suggestions, improvements, ideas lemme know :D
Regards,
Mihai.

sheep600fx · July 30, 2011, 12:13:00 AM

Wow sounds promising for the flight test, For me it needs to perform at least the same as 35mhz but ideally a bit better before I'd buy. Love the cartoons and thanks for the effort your putting in

thundead · July 30, 2011, 12:23:26 AM

Quote from: sheep600fx on July 30, 2011, 12:13:00 AM
Wow sounds promising for the flight test, For me it needs to perform at least the same as 35mhz but ideally a bit better before I'd buy. Love the cartoons and thanks for the effort your putting in

Well, considering I got 1,2km on ground, it should go much much further in the air. It's still a bit windy here in Abd but hopefully I'll get lucky on of these days. I'll keep u guys informed.

Cheers,
Mihai.

Coyote · July 30, 2011, 01:16:53 PM

Looks good so far, the test does look promising.

mark1975 · July 30, 2011, 01:46:09 PM

this is great news a step in the right direction as i see..looking forward to seeing the results from the air..now

thundead · July 30, 2011, 02:08:13 PM

Well guys hang on tight :D

Off to the gym now but BBC weather shows only a 7mph wind here in Aberdeen so i'll be taking the LRS for a spin after I get back.

I currently have a 5.8G Tx/rx for vid with cloverleaf and skew antennas <<Thanks Simon!! so hopefully I'll get good range from that setup.

Wish me luck haha

Cheers,
Mihai.

sheep600fx · July 30, 2011, 02:57:40 PM

Good luck, Getting excited for you :D

mark1975 · July 30, 2011, 03:10:26 PM

:popcorn:

pk-surfing · July 30, 2011, 07:31:37 PM

Mark, shift over a bit mate... I can't see the screen.

What time does the film start ?

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thundead · July 30, 2011, 07:54:03 PM

Mission successfull ;D

Going home :)

Gonna take a bit to upload the thing on utube but its worth it ;)

Anyway, long story short, 1,2 km, no glitches yaaay

Mihai

Devonian · July 30, 2011, 08:40:53 PM

Mihai,
Great news, seems pretty good so far.
You could always try a tuned antenna on the Rx or maybe the stock Tx one on the Rx for a bit more range.
Waiting for the video...

I'm on holiday for the week, in north Cornwall, near Newquay (but far enough away ;) ) and only brought my little R/C Multiplex Fox to play with, oh and a couple of power kites, so got something to do, depending on whether the wind blows or not :)

Keep up the good work.

Nigel.

thundead · July 30, 2011, 10:19:08 PM

Oki, so my orange broadband finally decided to finish uploading the vid on youtube haha

First, some pictures :P

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And here's the video :D :flagUJ: :flying: :popcorn:

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OpenLRS at 459Mhz Flight Test
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As for me, :party: , :pint: aand :vomit: later if things get out of hand haha :D

Cheers,
Mihai.

thundead · July 30, 2011, 10:20:00 PM

And this is my 20th post finally :D
Sounds good Nigel :D I'll prob be moving my gear into my modified stryker sometime next week \0/

Sorr bout the crappy quality btw.

Enjoy,
Mihai.

Devonian · August 09, 2011, 08:49:04 PM

OpenLRS has easily gone out to 3km...(not by me)

OpenLRS Rangetest

Nigel.