Gareth Magennis wrote:

-----------------------


Well a piece of wire worked a treat.

With a bit of heatshrink for strain relief at the transmitter end and
another on the end of the tail, it even looks like a proper one.



** So now you know how to make a "rat tail" antenna.


Thanks to all for the calculations and info.


** 300 / MHz = wavelength in metres, is worth remembering.


FYI:

That AG-1 unit is about as basic as UHF FM links get, so has limited useful range and is prone to signal drops out due to multipath interference. The Tx signal can almost cancel itself after reflecting off objects and surfaces and then arriving at the Rx.

Better models have twin channel receivers, with two separated antennas, operating as a diversity pair that helps greatly to eliminate such drop outs.



..... Phil