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Old Nov 16, 2013, 04:49 AM
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OrangeRX / OpenLRS 433Mhz hack#2 : 1W TX in the plane : APM long range telemetry

Hi,

I modified an OrangeRX 1 watt TX to be able to use it on the plane, and have a fully bidirectionnal 1W link for 2 x $28.45

And it works quite well with 232 packets lost on 100.090 (=0.2%)



Detailed description and step-by-step instructions here.
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Last edited by flipflap; Mar 21, 2014 at 02:19 PM.
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Old Nov 20, 2013, 08:37 AM
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Finland, Vihti
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Quote:
Originally Posted by flipflap View Post
Hi,

I modified an OrangeRX 1 watt TX to be able to use it on the plane, and have a fully bidirectionnal 1W link for 2 x $28.45

And it works quite well with 232 packets lost on 100.090 (=0.2%)



Detailed description and step-by-step instructions to come...
While waiting for those instructions (), quick questions - using TX as RX, did you break out the channel pins by soldering to the ATMEGA328?
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Old Nov 20, 2013, 10:40 AM
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I'm using just 3 connections : +, - and serial PPM out. For simplicity (and pin accessibility), the PPM out is on the same pin that is used for PPM in on the TX.

Serial PPM is then sent to APM, on which the servos are connected.

So it's very simple : two cables between APM and OLRS
-a cable for serial PPM
-a cable for telemetry data
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Old Nov 20, 2013, 10:50 AM
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Quote:
Originally Posted by flipflap View Post
I'm using just 3 connections : +, - and serial PPM out. For simplicity (and pin accessibility), the PPM out is on the same pin that is used for PPM in on the TX.

Serial PPM is then sent to APM, on which the servos are connected.

So it's very simple : two cables between APM and OLRS
-a cable for serial PPM
-a cable for telemetry data
Oh yeah - of course the PPMin is a free pin.
So no RX side RSSI to APM?
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Old Nov 20, 2013, 11:55 AM
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I could output it on another accessible pin, for example on the "button" pin.
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Old Nov 21, 2013, 01:47 AM
Moscow
Joined Feb 2012
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Is it really 1W?

Did you check what is RFM23 power supply?
If it's 3.3V it's too far from 1W.
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Old Nov 21, 2013, 03:02 AM
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Powered at 3.3v it gives 364 mW, powering the module at 5v gives about 600mW.
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Old Nov 21, 2013, 05:47 AM
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I mean did you check how is it powered in futaba module?
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Old Nov 21, 2013, 12:14 PM
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It's 3.3V
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Old Nov 21, 2013, 12:53 PM
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Finland, Vihti
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Quote:
Originally Posted by flipflap View Post
It's 3.3V
Why do the HK Futaba and JR Orange LRS 1W TXes specify that only 3.3v FTDI can be used?
I understand this for the 100mw models, with the RFM22s.
But what part of the 1W models is going to break if you apply 5v? Not the RFM23BP?
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Last edited by nicnet; Nov 21, 2013 at 12:53 PM. Reason: clarification
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Old Nov 21, 2013, 01:54 PM
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The RFM23BP needs 3.3V max on its communication pins.
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Old Nov 21, 2013, 02:08 PM
Moscow
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It actually works fine with 5V on communication ports in HawkEye.

But HK modules are not 1W as they declare. Much much less!
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Old Nov 21, 2013, 03:08 PM
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Originally Posted by flipflap View Post
The RFM23BP needs 3.3V max on its communication pins.
So on the 1W HK modules, is the VCC to RFM23BP also 3.3?
If so, it should be easy enough to cut that track and apply 5v right? (like on your 100mw to 1W conversion?

Acknowledged that 1W in this case is at best 0.5W, likely less ...
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Old Nov 21, 2013, 03:19 PM
Moscow
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But you will need another voltage regulator for 5V.
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Old Nov 21, 2013, 03:25 PM
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Originally Posted by shuricus View Post
But you will need another voltage regulator for 5V.
True, and also easy.
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