[time-nuts] EMI and CE certification

[Adrian Godwin]

Is it driven as  an inductive loop? That might put it under different
regulations.
On 11 May 2015 17:47, "Chuck Harris" <cfharris at erols.com> wrote:

> 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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