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
Replies
I have both RDF Flex1 and RFD Flex2 antenna's. From reading through this thread I see the long thin one [ Flex 1 ] goes horizontal [ I think it would be wise to state that with the product ] . My question is I know the long part should go horizontal however I'n not clear on if the thin way can go horizontal as well. For instance I would like to install it on the bottom of the fuselage i.e. horizontal both ways. Or... would it be best to have it mounted on the side of the fuselage i.e. long ways horizontal short ways vertical.
Thx
Rick
Hi Rick,
The FLEX1 antenna can be used in both of the cases you describe. If you have the choice of mounting it on the bottom of the fuselage, or side, - I would go for the side, providing there is good clearance from metal.
Cheers,
Seppo
Dear Seppo or anyone inclined to help,
I've been struggling with this problem for a few weeks now; I have run out of ideas and turn to you for help.
Setup:
APM 2.6 + external compass/gps running plane 2.78b
-RFD 900 Telemetry Radios on both sides, running SiK 1.9. 3 DB antennas on the receiving side (tablet/PC size) and stock antennas on the plane.
-1.3ghz for video (800mw)
-ezuhf for control
I've checked the noise levels with all my gear turned on, and I get 20-30 noise readings on local & remote (with about 90-110 value for RSSI)
I cannot fly further than 150 meters without losing telemetry. I've tried changing my AIR_SPEED to 24 from 64, but does not help. I've also tried powering the local radio by USB and external BEC, same results. I have no issues with video or EZUHF; I can go as far as 35 minutes affords me without losing either.
I am using two antennas on both RFD900 radios. I see some people are only using one? I haven't tried single antenna.
Attached are pictures of the RSSI values, my configuration parameters & the plane layout. Any help, input or suggestions would be greatly appreciated.
Thank you!
Raph
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Eladio,
Thank you for your input! I will check the antennas. Another user said that I have my antenna orientation completely wrong on the plane, which could be the cause of my issues. I have replaced them with 90 degree antennas so they are pointed up (in a slight V shape actually). Hopefully the winds will calm and I can test and come back with results.
WOW, this project have incredible potencial, I'd also love to see a 433/868 european version.
What about RClink? Is it working?
Subscribed !
Hi Seppo,
Are there any plans on making these neat radios availiable for european folks using 868 or 433 Mhz?
Just a quick update on other things that are in the works.
We're planning on getting the RFD900u FCC/IC certified in January, this will make it easier to use the RFD900u in all kinds of applications.
One thing that we're still checking out is the firmware requirements on having a fixed set of parameters for the frequency bands and number of hops. Since changing these settings could invalidate the compliance tests done.
The RFD900's are also planned to follow with approval later in the year.
Cheers,
Seppo
Hi All!,
We have a storewide 10% sale prior to Christmas until the 20th December!
Use the coupon code SMILE and you will get 10% off your order. :)
Best wishes from us all.
Seppo
We have been asked about high altitude chamber testing of modems and was wondering if anyone had any practical experience with what a good test setup / profile would be?
Initial thoughts are a temperature chamber, with a vacuum chamber regulated to maintain 120k feet equivalent pressure or so?...
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