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:
- 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:
How come you have ECC turn on ?
I would turn it off
Jeremy Stromsoe said:
Seppo, could I use this antenna on the RFD 900 and still get 20+ miles or would this antenna harm the unit running it a full power? Im looking for the sleek form factor.
Did you ever find a solution to your range issues? I'm having similar problems as seen in my post here.
Ivan R said:
Wondering if this was ever narrowed down to a bad antenna or other source? I'm having a very similar issue, see further down in this thread:
One thing I just noticed... both of my NODEIDs are set to 2. Shouldn't one be NODEID=0 for the base node and one be NODEID=1 for the air side? Could that be my problem?
Jamie, did you figure this out? I'm also running MinimOSD and it works fine with the RFD900+. You have to make a "Y" in the cable and send tx/rx wires to both the OSD and the RFD900.
Jamie Glover said:
Additionally, here's what Mission Planner spit out for my settings for the ground side. Sort of a duplicate of what I previously posted, but there are a few more details here:
L/R RSSI: 204/205 L/R noise: 54/46 pkts: 838 txe=0 rxe=3 stx=0 srx=31989 ecc=0/0 temp=-270 dco=0 pwr=20
See the image link above for more a screenshot.
Thank you very much for your reply. I finally found some time to run this test, which I did in my enclosed garage here in San Diego, with no more than about 1m distance between the vehicle and antenna tracker. Here's a quick pic of the plots, but to summarize, both noise and remnoise are running right around 50 counts and rssi and remrssi are steady (and nearly right on top of each other) at 190 counts. Both my radios are running RFD SiK 1.12. My apologies for not having a spectrum analyzer laying around, but I could probably borrow one if that was necessary for this troubleshooting.
I'd love to try a flex 1 antenna on the plastic strip... I'll tell you what, if we sort this range issue out I'll buy 2!
The only thing that comes to mind to do next is crank up the power to 1W and see what kind of range I get from that, but really thought I'm about certain that isn't going to solve anything given I can only get 1000ft without quality issues. Any other ideas to try Seppo? I think given the range that others are reporting this is a bizarre problem. Its not as if I have an issue connecting in the first place... Everything works EXCEPT the range. Anyhow thanks all for the responses, pretty anxious to fly more than 1000ft!
I should mention as well that a spectrum analyzer I have is indicating a noise floor of -105dB in the 915-928mhz range, which is pretty close to what the 3DR is reporting.
Allan Matthew said:
I'm also running into range issues with two RFD900x's purchased from Aero Systems West, but I think my issue is related to noise. I'm running at txpower=20 on both sides of the link, and I get the following from an ATI7:
I see similar results (noise >90 anyway) both indoor and outdoor, and in the same location a 3DR radio will report noise of 30-60. The radios are running:
Thanks in advance,