communication:licence_exempt
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| communication:licence_exempt [2006/07/08 12:28] – rocketboy | communication:licence_exempt [2013/04/12 20:48] (current) – External links edited geoff-g8dhe | ||
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| + | ====== Licence Exempt ====== | ||
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| + | There are a large number of licence exempt radio communication modules available (e.g. see link) - however there are only 3 types that may be used for air to ground communication (see link) - these are: | ||
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| + | * Radio Location: 173.7 – 174 MHz and 458.9625 – 459.1000 MHz 10 mW ERP (Effective Radiated Power) 12.5 kHz or 25kHz bandwidth | ||
| + | * Data Transmission: | ||
| + | * Video: 2.400 – 2.4835 GHz 10 mW EIRP (Effective Isotropic Radiated Power) 20 MHz Bandwidth | ||
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| + | Modules must conform to EN 300 220 | ||
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| + | And as of September 08 - 500mw on 869.40- 869.65 MHz < 10% duty cycle | ||
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| + | Given the very low powers (10mW is about the power used by a dim LED)- its going to take some doing to use these in balloon to ground communication - but it can be done - over 400Km has been achieved. | ||
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| + | Below is an example of a 10mW NBFM (Narrowband FM) transmitter module for use at 434.650MHz. | ||
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| + | {{communication: | ||
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| + | The [[http:// | ||
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| + | ===== External links ===== | ||
| + | * http:// | ||
| + | * http:// | ||
| + | * http:// | ||