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[Paparazzi-devel] 900 Mhz or 2,4 Ghz modem (Chris)

From: chris
Subject: [Paparazzi-devel] 900 Mhz or 2,4 Ghz modem (Chris)
Date: Fri, 17 Apr 2009 19:23:50 +0300
User-agent: Thunderbird (X11/20090318)

If you are in Europe you will need either the 868 Mhz or the 2.4 ghz ones.
The 900 Mhz is allocated to cellular phones in Europe so there might be problems.
The 900 Mhz do have frequency hopping (Aerocomm)
so they might get away with interference but i don't know that for sure as i have never used them in Europe.
The 868 does not use frequency hopping AFAIK.
If you are located elsewhere (US, Australia etc.) the 900 Mhz is a good choise as is the 2.4 ghz. All depend to what RC transmitter and / or video transmitter bands you will use.
Try and use different bands for each service (RC, Video, Telemetry)
I use the 2.4 ghz Xbee pro, a 2.4 ghz RC receiver that uses FHSS
(frequency hopping spread spectrum) and plan to use a 2W 850 to 950 Mhz video transmitter.
For example Futaba uses FHSS at 2.4 ghz (Futaba FAAST)

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