Thread: New Product RFD900 - Long range radio modem
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Old May 29, 2012, 03:02 AM
Seppos is offline
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Australia, QLD, Brisbane
Joined Nov 2011
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A quick update on the RFD900 modems,

Production boards are due to arrive tomorrow (30th May), with a verification build happening towards the end of the week to make sure everything is still within spec.

One of the motivations on designing the RFD900 was the lack of features in existing modems tailored for UAV applications. I had not seen integrated support for antenna diversity which is very beneficial for mobile platforms like UAVs.
The diversity implementation on the RFD900 chooses the best antenna on a packet by packet basis. Having one antenna vertically polarised and the second antenna horizontally polarised (or both at +/- 45 deg) will cover most airframe attitudes reducing the chance of link loss.

Another thing is the attention to filtering - since most RC/UAV platforms operate with a number of radios, being "nice" in terms of reducing noise on other bands (especially GPS, 2.4GHz) is key. The RFD900 has integrated transmit low pass filtering and a chebyshev front end band pass filter on both the transmit and receive path.

Will post more updates on the production boards as they are built !
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