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Description
RFD 868x EU V2 Long Range Telemetry ModemRFD868x EU New Features: New Processor, ARM 32 bit core. Air data rate: 200kbit s. AES Hardware accelerated encryption. *Fully working* RC PPM Passthrough with telemetry at the same time. Fully ESD protected + filtered Every IO port is protected and filtered. Original SiK point to point firmware implemented. Note: Currently due to the bandwidth limitations of the 868 modems Asynchronous Mesh and Multipoint Firmware are not officially supported for the
RFD868x-EU New Features:
- New Processor, ARM 32 bit core.
- Air data rate: 200kbit/s.
- AES Hardware accelerated encryption. *Fully working*
- RC PPM Passthrough with telemetry at the same time.
- Fully ESD protected + filtered - Every IO port is protected and filtered.
- Original SiK point to point firmware implemented.
- Note: Currently due to the bandwidth limitations of the 868 modems Asynchronous Mesh and Multipoint Firmware are not officially supported for the 868X modems and correct operation of this code cannot be guaranteed
Features:
- Long range >20km depending on antennas and GCS.
- 2 x RP-SMA RF connectors, diversity switched.
- 500mW (+27dBM) See specifications.
- Transmit low pass filter.
- > 20dB Low noise amplifier, high IP3.
- RX SAW filter.
- All I/O ESD protected and filtered.
- Re implemented SiK and firmware, field upgrade-able, easy to configure.
- Small, light weight.
- Note: Not compatible with older modems
- The standard RFD868x will not communicate with the RFD868x-EU modem unless the standard RFD868x is configured to the same frequency as the EU modem.
Interfaces:
- RF : 2 x RP-SMA connectors
- Serial: Logic level TTL (+3.3v)
- Power: +5v, ~800mA max peak (at maximum transmit power)
- GPIO: 6 General purpose IO (Digital capable).
Specifications:
- Frequency Range: 868-869 MHz
- Output Power: 500mW (+27dBm), controllable in 1dB steps ( +/- 1dB @=20dBm typical)
- Air Data transfer rates: 12, 56, 100, 200 kbit/sec (User settable, 200 kbit default)*
-
UART data transfer rates: 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400, 460800, 1M baud (User settable, 57600 default)*
*note these values are correct as of version 3.07 SiK firmware - Output Power: 500mW (+27dBm)
- Receive Sensitivity: >111 dBm at 12 kbps, 105 at 64 kbps and 98 at 200 kbps
- Size: 30 mm (wide) x 57 mm (long) x 12.8 mm (thick) - Including RF Shield, Heatsink and connector extremeties
- Weight: 14.5g
- Mounting: 3 x M2.5 screws, 3 x header pin solder points
- Power Supply: +5 V nominal, (+3.5 V min, +5.5 V max), ~800 mA peak at maximum power
- Temp. Range: -40 to +85 deg C, tested operational from -73 to +123 deg C.
Software / GCS Support:
The software solution is an open source development called "SiK". It has been re implemented to suit the new processor architecture available on the 32bit ARM processor core. A boot loader and interface is available for further development and field upgrade of the modem firmware via the serial port.
Most parameters are configurable via AT commands, Eg. baud rate (air/uart), frequency band, power levels.
Integrated support for configuring the RFD radios is supported by APM Planner.
The default settings are at 57600 baud, N, 8, 1, and 200k air data rate.
The RFD868/900x manual is here: RFD900x Manual
The RFD868/900x SiK software manual is here : RFD900x Peer-to-peer Manual
Software features include:
- Frequency hopping spread spectrum (FHSS)
- Transparent serial link
- Point to Point
- Configuration by simple AT commands for local radio, RT commands for remote radio
- User configurable serial data rates and air datarates
- Error correction routines, Mavlink protocol framing (user selectable)
- Mavlink radio status reporting (Local RSSI, Remote RSSI, Local Noise, Remote Noise)
- Automatic antenna diversity switching on a packet basis in realtime
- Automatic duty cycle throttling based on radio temperature to avoid overheating
Compliance:
RFdesign declare that the equipment is in conformity with the relevant Union harmonisation legislation:
Directive 2014/53/EU on radio equipment
The RFD868x-EU is compliant with the following standards:
- EN 301 489-3 V2.1.1
- EN 300 220-2 V3.1.1
- EN 62311:2008
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4.5 ★★★★★
Based on 24 reviews
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Product Reviews
★★★★★ 5
Good read!
Format: Kindle
I wanted a break from some tense mysteries. This provided me with an enjoyable break by reading a good story with an unexpected ending.
I recommend it to anyone looking for a very good cozy read!
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Reviewed in the United States on June 7, 2026
★★★★★ 5
Very good, entertaining mystery.
Format: Mass Market Paperback
I don't know if this author has written other books before beginning this series but it is a very good FIRST in what is so far just a 3 book series. I ordered all 3 but am reading them in order as I always do. The author tends to go into too much detail about mundane things about things like fixing a meal, etc., but it isn't too distracting from the story. I like a little hominess but this is overdone just a tad. The story moved right along establishing characters without throwing in so many that you simply can't keep them all straight as some authors do. A thoroughly despicable victim so nobody cares if he dies violently. And, to me, a reeeely surprise ending. For someone who has read as many mysteries as I have, this was a pleasant surprise and the author doesn't give you hints till you are almost at the reveal so that you feel clever at figuring it out but you don't figure it out too early and you are still a bit surprised that you were "right" about who did it. Also, the "hero" is a thoroughly likeable guy. Don't you hate it when the "hero" or "heroine" just comes across as someone you don't really like much. You know, the one that if he or she gets beat up, you sort of feel like they deserved it and you've not really sorry. Well, if something bad had happened to "Charlie" I'd have been very upset. Now, if #2 will just show up I'll get on with the series. This is a series I'll be keeping in my library to reread in a couple of years.
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Reviewed in the United States on September 15, 2012
★★★★★ 3
OK book
Format: Kindle
I read this for our book club, got the book on Kindle, so the "back of the book" description was not there...It took me a while to get into the book. I'm used to female lead characters, and I had to adjust for the lead character to be Mr. Charlie. The manners shown by the characters are a bit dated, by about 40 years, but it's nice to be re-exposed to good manners. Loved Deisel the cat, but whenever he's mentioned (which is a lot) it tells he's a cat. That got to be old, fast. Otherwise, it was a good book, quick read. I was rather shocked to learn that Miranda James is just a pen name for a male writer.
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Reviewed in the United States on March 15, 2014
★★★★★ 4
A cat, a murdered author, and a librarian cum sleuth - what more do you need?
Format: Kindle
Murder Past Due has it all. A small town where everyone knows everyone, return of the prodigal son, murder, and a just-nosy-enough archivist with connections to them all. My favorite character is Diesel, the cat, though his primary role is as a comforting presence. I would have been happy with more of a supporting role for him—there were a few moments where I thought he would get one, but it didn’t quite take off.
The mystery engaged me and kept me reading. I had it nearly figure out in the last fifty pages, but there were satisfying twists leaving me pleasantly surprised right up to the end.
I was distracted by excess verbiage (Southern style?), and something ever so flat about the main character. He said he was surprised or upset or missed certain people, but I just didn’t feel it.
Still, I think I will read book two, and that merits a solid four stars.
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Reviewed in the United States on October 14, 2019
★★★★★ 5
The cat didn't do it!
Format: Mass Market Paperback
I bought the book, because it looked so cute. Plus, I love cats! It was a cozy mystery with the cat as a constant companion of the protagonist. It made for a delightful story. I don't usually read low key mysteries, but I thoroughly enjoyed the humor, the cat, and the murder mystery. I plan on buying the next one. Ms. James has a writing style that you will enjoy her stories. You will not get bored.
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Reviewed in the United States on April 11, 2026