Gareth Magennis wrote:

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From the manual:

It operates in the uncrowded 801 €“ 805, 863 €“ 865 MHz UHF frequency range


** Normally a straight, 1/4 wave length whip antenna does the job well. Helically wound antennas (rubber duckies) are not better, only shorter and less efficient. I note the owners manual says the antennas are 1/4 wave.

RF travels at 300,000 km/S so 830 MHz has a wavelength of 360mm, 25% of which gives you 90mm from the attachment point inside the Tx. A 5% "end correction" can be applied so make it 85mm.

Use wire that has a stiff cover like Teflon, to hold it out straight.



.... Phil