Yes, but in the case of the lawnmower fence, and the
invisible dog fence, the transmitter drives the fence
as an antenna.
In the US, the antenna size for "free bands" is seriously
limited. As an example, the so called "Lowfer" band at
136KHz is limited to antennas no larger than 15m in length.
And, that is one of the larger limitations.
15m would encircle only a very small lawn.
OBTW, I realized on reading my post below, that I was very
unclear on what could "be foiled." I meant that the
operating permission for the lawnmower system could probably
be foiled by looking into the maximum antenna lengths for
unlicensed services of this sort, in this frequency range.
I would quite imagine that any certification they may have
is for the transmitter and receiver, without an antenna.
-Chuck Harris
Alex Pummer wrote:
yes for transmitter antennas, but not for receiver antennas in Austria Germany
Switzerland France Hungary one could have receiver antenna as long as he want,
but
the height is limited similarly as in the US
73
KJ6UHN
Alex
On 5/10/2015 7:15 AM, Chuck Harris wrote:
My recollection is that in the US, certain requirements
exist for antenna length on the so called "free bands".
I have no idea what the European requirements might be,
but, perhaps they can be foiled by their allowing their
minuscule amounts of power to flow into an over length
antenna?
-Chuck Harris
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