RFD900, RFD900+ - New long range radio modem

Hi All,

I would like to introduce you to a new radio modem that we developed for very long range datalinks!

http://rfdesign.com.au/RFD900.php

Some of the key features of the RFD900 are as follows:

  • Multi point and point to point link capability.
  • Long range >40km depending on antennas and GCS setup.
  • 2 x RP-SMA RF connectors, diversity switched.
  • 1 Watt (+30dBm) transmit power.
  • Transmit low pass filter.
  • > 20dB Low noise amplifier.
  • RX SAW filter.
  • Passive front end band pass filter.
  • Open source firmware / tools, field upgradeable, easy to configure.
  • Small (30 x 57 x 13 mm), light weight (14.5g).
  • Compatible with 3DR / Hope-RF radio modules.
  • License free use in Australia, Canada, USA, NZ.

 

These modems are designed to support long range applications, while being easy to use and affordable.  

These modems have been flying in various platforms and have demonstrated excellent performance in real applications. 

RFD900 modems are now available at: http://store.rfdesign.com.au

Support within APM planner and the radio configurator from Michael Oborne is already available.

It works seamlessly with APM planner, all radio Mavlink parameters are available.

Update, December 2014:  The RFD900+ with improved specifications is available now at:

http://store.rfdesign.com.au/rfd-900p-modem/

Seppo Saario

rfdesign.com.au

 

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900+ and 900X are not compatible. I do have multiple pairs of each.

The biggest advantage of the 900X is its fast processor which let ECC work without any lag.

Cheers

Henri



Edward Sellars said:

I have one 900+ unit and one 900x. I cant get the 900x to talk to my 900+. I've tried all sorts of firwares, etc? Can anyone help or are they simply not compatible? The newest 2 900x firmwares say they will not work with older versions of the SIK firmware because of a change in frequency so i tried all of them and put 1.13 on my 900+. Any help would be great!

Thanks

Some one using RDF868x???

We are trying to install one of them, and we are having serious problems with GPS. This does not even do 3D fix. 

It lost almost all satelites when we switch on the RFD868

We have tested RFD900 in the past and not problems but the I have a big problem RFD868.

someone with same problem has tested other frequencies or a filter?

I have issue in connecting the rdf900x radio as relay with asynchronous firmware 
as of now i have made the setup in the following way

Node 1: ATS10 = 1, ATS11 =3 // set node 1, destination 3
Node 3: ATS10 = 3, ATS11 =1 // set node 3, destination 1
Node 2: ATS10 = 2, ATS11 =don't care, AT+F0=1,3, AT+F1=3,1 // forward 1->3, and 3->1
after setting up  , my flight controller rfd900x (node 1) get binds with gcs rfd900x (node 3) in between i just powered on node2 rfd900x  .. Seems to be the data is not relayed via node 2 
please help me how to make the setup for data communication relay 

I want to use an USB extension before the FTDI cable to put the radio longer and over a pole, but it seems it gets low power and turn on and off continuosly, the extension is active (there is a circuit on the end) and it works with standard 3DR radio.
What is the right way to extend the cable, maybe after the USB-serial conversion or do you know an active cable that actually works?
Thank you

If you have the power on the radio set to a value that's high enough (+30dbm), you're probably exceeding the amount that USB is supposed to supply. USB 1 and USB 2 supply half an amp. USB 3 supplies .9. The RFD 900x can draw one amp peak. With a longer cable.....a marginal situation can cross over to not working.

Try turning down the radio's output power. At 20 dbm, you'd be within spec on all USB versions.  You should be able to do ~25-27 dbm on USB 3.0.

I wouldn't risk running at full power from USB for something important!

On a similar note, I know for a fact that powering a RFD 900x from a Pixhawk (especially when the Pixhawk is powered by USB) is a bad idea. My PixHawk had fits and occasionally locked up when I did this. Fortunately, this occurred on the ground and I realized the error of my ways before it became a costly mistake.

RR

Dear Ronald I have set at 20 dBm the 2 radios and now the extension cable works, I have a cheap USB meter and if it's precise it is measuring 5.14 V 0.12 A 0.643 W.

The drone radio is powered by a Turnigy 5V BEC and it was at 24 dBm because more power was causing jitter to the servos, now it's 20 dBm, I think it will be ok because I use a Yagi on the ground and a quarter dipole on the plane, it was working well upto 20km with a cheap Rock telemetry sold as 500 mW (not true).

The radios firmware is v 1.12 is it worth to update to 1.13?

thank you

Roger Ronald said:

If you have the power on the radio set to a value that's high enough (+30dbm), you're probably exceeding the amount that USB is supposed to supply. USB 1 and USB 2 supply half an amp. USB 3 supplies .9. The RFD 900x can draw one amp peak. With a longer cable.....a marginal situation can cross over to not working.

Try turning down the radio's output power. At 20 dbm, you'd be within spec on all USB versions.  You should be able to do ~25-27 dbm on USB 3.0.

I wouldn't risk running at full power from USB for something important!

On a similar note, I know for a fact that powering a RFD 900x from a Pixhawk (especially when the Pixhawk is powered by USB) is a bad idea. My PixHawk had fits and occasionally locked up when I did this. Fortunately, this occurred on the ground and I realized the error of my ways before it became a costly mistake.

RR

Ianzo,

I'm running 2.61. Since you're running a way different number, I suspect you have something other than the RFD900x.

Most of the RFD FW updates are to add features. Unless you need a new feature in the new version, I wouldn't bother.

RR

433 would be the best choice.

Roger.

Looks like Lanzo may be using the RFD900+ as that has the V1.xx firmware available. only a guess here mind you!

Paul.

Can you elaborate here RFD433? or am I missing something!

Roger Ronald said:

Ianzo,

I'm running 2.61. Since you're running a way different number, I suspect you have something other than the RFD900x.

Most of the RFD FW updates are to add features. Unless you need a new feature in the new version, I wouldn't bother.

RR

Correct I have RFD900+
Do you calibrate the rssi for mission planner? I see 100% or 99% all the time just before it loose connection



Paul Clark said:

433 would be the best choice.

on 433 MHz, all the cranes, heavy vehicles, earth movers two ways radio are "pumping" tens of watts so not automatically the best :-)

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