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Max Demian

On 06/10/2017 11:13, wrote:
On Wednesday, 4 October 2017 14:40:53 UTC+1, Bob Minchin wrote:

Most antennas are on the circuit board in these sort of devices and work
at all sorts of funny impedances.
The extra circuitry to have a 50 or 75 ohm connector to a length of
cable and hence onto a remote antenna is a significant expense and
design complication.

The ones I know about are a good match to 50 ohms. However, the comment
made elsewhere about mains isolation being expensive is probably valid.
Also, an external antenna would be very easy to disable, should the
customer wish to do without useful features such as remote disconnection
of the supply.

If they implement that feature, it'll probably require a periodic
connection to *stop* it from disconnecting.

--
Max Demian