31 Aug 2013

50 nanowatts ERP tests on 70cms FM

This afternoon I did a quick test using my signal generator on 432.975kHz FM using my V2000 vertical. I put up a 50nW ERP FM signal with a 1kHz tone and looked for the RX signal on my little VX3 hand portable with its tiny helical antenna at my old QTH some 300m away from the new location. Although unable to copy the signal downstairs, the signal was S3 in the old shack upstairs. Based on this test with a pretty inefficient RX antenna, I think the 10nW signal would be copyable around 1-2km away with a mag-mount on the car. It goes to show how far QRM can travel.

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