I would like to introduce you to a new radio modem that we developed for very long range datalinks!
Some of the key features of the RFD900 are as follows:
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:
Jeremy, my experience has been that the RFD900 works ok with ECC on, but the RFD900+ doesn't. Seppo told me that the 900+ just couldn't handle the overhead of ECC because of other added features. ECC has to be set the same on both ends for the transceivers to link. Since I disabled ECC on all my ground stations and aircraft, my telemetry problems have disappeared. I've since upgraded the aircraft radios from 3DR to RFD900u devices and couldn't be happier.
Don, are you using SiK firmware and if so what version/settings?
Jeremy, yes I'm using SiK firmware versions from 1.5 to 1.12 all communicating nicely. By that, I mean I might have an aircraft with 1.12 communicating with a ground station running 1.5 or some other version in between, or vice versa. I'm attaching a screen shot of the settings, they are pretty much the defaults, except for Tx Power and ECC. As you can see, in this instance, I have a 900+ w/SIK 1.9 on the ground and a 900U w/SIK 1.12 on the aircraft.
I've read only your last few posts, so I'm not sure what you are up against.
Have 3 set bundle rfd900x but still cant connect by using mission planner or 3dr radio config.
Try reflash but not affected at all.
What I have to do for it?
kent Martin said:
Did flash RFDSiK V2.53 rfd900x.bin using the RFD900x Flash Programmer: OK
Using Hyperterminal, I can use the AT commands and the modems are ok.
Unfortunately, mission planner isn't able to talk to these modems???
Don't know what to do next..
Any help welcome.
Thank you in advance.
The RFD900x document is still in progress but most AT commands are common with rfd900+ (with exception to encryption and PPM configs)
The AT command set for rfd900+ can be found here:
benny arisusanto said:
Here is reply from rfd:
I have confirmed the issue and it is due to a slight change in the communications of the settings of the new modems. We have communicated the issue to the mission planner developer and expect that it will not be too difficult for him to fix. In the mean time the only supported method for updating or checking modem settings is to use the AT command set.
Type +++ at command and get reply OK
And then no answer from moreton what have to do.
Any user feedback on PPM through RFD900x ? A post is talking about expected latency, what kind are we expectinh here ?
Also do you plan a 868 Mhz modem for Europe ?
Don't need encryption at this stage,
I have air-frames grounded because of these incompatibilities between mission planner and 900x modems.
not good, :-(
@davidbuzz: Did you manage to get mission planner (with 900x on usb) talking to another 900x on an airframe?
AFAIK: the 900x radios are superior to the 900+ in just about every way, ( which itself is great) but the loss that had to occur in doing the moride advanced features of the 900x was that they are not (currently) air-compatible with the 900+ radios in software/firmware. Of course, that said, it's not a hardware limitation, not that I know of anyway, so totally possible, in theory, for someone who was keen to make their 900x and 900+ air-compatible. I just don't think it's top priority for the manufacturer right at this moment.
Solve, mission planner can read 900x parameter.
Mission planner have to be update to Beta Update
@benny arisusanto: Yes indeed! :-) RFD 900X solved
That is very encouraging . I'll measure the lag time on CPPM signal with a scope and will report the values.