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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Shyam,

This is implemented in RFD900X. I haven't seen anyone keen to add this to the 900+ as it may be a stretch for the micro to handle. Since it is available in the 900x along with other features I don't think it is likely IMO.



Shyam Balasubramanian said:

@Seppo, the main question I have before purchasing this device is whether it is "spoof proof", i.e. can I prevent hijack of a drone with your device and does it provide a safety AES-128 encryption possibility? I am more interested in secure data links.

Any feedback on this is appreciated.

PS: https://www.rcgroups.com/forums/showpost.php?p=30213935&postcou... was a post from 2014 which stated: 

  • AES Hardware accelerated encryption support *software still in development for this * - The Branch is accessible in Github for those who are keen to assist us in getting this feature fully implemented.

Don't know what the status on it is today, i.e. 3 years down the line?

Hi all, can any of you legends point me in the direction of multipoint firmware for the 900x? Been operating two as a pair without any problems, mighty fine, but no joy with the  RFD900x-AsyncRelease_V2.43.bin firmware. The RFD Tools 2.0 can read the settings on the remote unit but no joy with mission planner.

Cheers fellas.

Rico.

Will 900x multipoint communicate with my existing 900+ multipoint network?

Hi Seppo,

Can I use 2 RFD modems on the same drone (of course, on different channels). May they interfere each other?

Hi Rico,

Sorry to hear problems with async, Can you tell us what exactly happened with mission planner?

Sometimes MP or copter needs to be updated. This has happened on a number of releases with MP.

Can you get MP to work with Sik Code using the same MP and copter as async test?

If there are problems we would like to get them fixed.

As far as multipoint goes, tridge did do a version on it, but it's usefulness is limited so it was not brought forward with a view of Async replacing it. I'm not sure if tridge made that branch public.

Time is better spent on Async (for us anyway) due to limitations and problems with mutlipoint.

Rico said:

Hi all, can any of you legends point me in the direction of multipoint firmware for the 900x? Been operating two as a pair without any problems, mighty fine, but no joy with the  RFD900x-AsyncRelease_V2.43.bin firmware. The RFD Tools 2.0 can read the settings on the remote unit but no joy with mission planner.

Cheers fellas.

Rico.

Hi Minh,

Yes , and Yes. That is to say you can set the network id differently on each set.

This will give them a different hopping sequence, they will not pick up the other radios data, but occasional collisions will occur and cause some loss.In theory it should work reasonably ok. But be careful if you are using PPM control on one radio set, loss here will effect controls so tread carefully if doing this and test it isn't too bad for flight. I'm talking about SiK code, assuming that is what you are using?

Another option is to separate the band in half and run each on completely different spectral range.

This would mean 1/2 the number of channels as well, so this would not be compliant for regulatory spectral requirements.


Minh Tran Quang said:

Hi Seppo,

Can I use 2 RFD modems on the same drone (of course, on different channels). May they interfere each other?

G'day Kent, appreciate your time.

I gratefully received V2.45 of the Async firmware and we now have comms with Mission Planner (small workshop dance). Just a couple of things before I can use it - I need to learn how to get rid of the latency and I can't switch between modems on mission planner with the Control-X shortcut. I have one modem in the laptop, one in the antenna tracker and one in the aircraft.

Cheers!

Rico,

Great it's working. To know what latency to expect I need to know your configuration.

There are a number of parameters that affect it.

The serial protocol format you are using, I expect it is mavlink.

I can't recall how it decides when to send packet with mavlink, I'll have to check.

Also the addressing. Global will typically take longer.

There is a roughly 10mS delay due to preamble for each packet. This varies with air rate.

Also depends if you are sending data back the opposite direction as it will randomly retry if data is coming back the other way. 

What times are you requiring? 

For lowest latency use one direction only, and use addressed data.

Are you running PPM as well?

Thanks

Kent,

Not sure how much you realize how happy I am to hear from you...

This is a fairly new setup so open to any configuration changes (and education) you suggest. The intention was to use the antenna tracker as the relaying hub as it has yagi antennas on it, so would that be two way for the AAT modem and one way for the aircraft and mission planner station? NodeID's 1,2 & 3. As far as latency times are concerned, it was possible to manually fly the aircraft on the mission planner HUD before, now it seems to take an eternity to update. I do have slip rings to install into the AAT but am trying to minimize the amount going through there to power and the least amount I can get away with. No PPM yet, still using the trusty EZuhf with a rapid find manual mode switch. You're probably going to laugh at the settings.

Attachments:

Thank you Kent,

It's good to hear that 2 RFD modem can work in the same drone. No, for sure I'm not using for PPM control, only for telemetry and other data transmission.

Rico,

Try setting serial break detect  (ats6) to 2.

You power is set to 10, assuming your outside this should be higher.

Also you are using global addressing. You really should be routing through node 2.

How are you relaying the data though node 2?

You need a micro there or some other method to relay the data through.

For one way comms you can loop tx and rx on relay node, but addressing will only go one direction

You will need both directions for mavlink data.

i.e. node 1 dest node 1> node2=2

node 2 dest = 3  (result is 1->2->3 but not 3->2->1)

It can also use the new SAS packet encapsulation to direct packets through a relay node to the desired destination, but this requires a micro at each end to direct through a dumb relay node.

We have been working or packet forwarding but as yet that feature has not been fully tested and there are some problems with it.

Other than that you can have a micro at the relay node to direct traffic to the right location. 

i.e. set relay node encap rx and tx to SAS. The micro will see packets and the source address, and then be able to send SAS packets back to serial port with the correct destination. The end nodes can then be dumb and both have node 2 as destination.


Rico said:

Kent,

Not sure how much you realize how happy I am to hear from you...

This is a fairly new setup so open to any configuration changes (and education) you suggest. The intention was to use the antenna tracker as the relaying hub as it has yagi antennas on it, so would that be two way for the AAT modem and one way for the aircraft and mission planner station? NodeID's 1,2 & 3. As far as latency times are concerned, it was possible to manually fly the aircraft on the mission planner HUD before, now it seems to take an eternity to update. I do have slip rings to install into the AAT but am trying to minimize the amount going through there to power and the least amount I can get away with. No PPM yet, still using the trusty EZuhf with a rapid find manual mode switch. You're probably going to laugh at the settings.

Hi Kent,

Power setting was default with the new firmware, yet to relaunch model outdoors with the tracker. Let me chew through that wonderful new info and will report back in with results. Thank you so much for your time.

Cheers!

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