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Old Sep 20, 2012, 07:14 AM
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UK, Cardiff
Joined Dec 2008
3,654 Posts
I have just done some hilltop testing of the locator, mainly to evaluate the receiver performance of the RFM22B radio.

Tested with simple 1/4 wire antennas only.

The Hilltops were 40kM apart and reception of data packets was reliable at full power from the locator,100mW. At 50mW 50% of packets were received.

If the locator was operated at the 10mW limit for license exempt devices, the equivalent LOS range would be 12.5kM

And whilst the use of Morse to transmit the calculated distance and direction might seem odd, the Morse audio was decodable by ear at 40kM with only 1.2mW power from the locator. That equates to a full power,100mW, line of sight range of 365kM.
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