From: drcuthbert
Sent: Thursday, March 25, 2004 1:38 PM
To: 'Ken Javor'; Barry Rowland; EMC-PSTC
Subject: RE: Shielded Loop Antenna for HF
You will need something larger than these sensors. At 3MHz a loop with
an area of 0.1 sq. meter will output 0.25uV (-12 dBuV) when placed in a
30 uV/m field. With a 3dB noise figure preamp the spectrum analyzer
noise floor is -24 dBuV with the RBW set to 10 kHz. So, a 0.1 sq. meter
loop will allow you to measure down to a field of 18dBuV/m. This size
loop will also work to 30 MHz. You could build your own if money is
tight.
Dave Cuthbert
Micron Technology
From: [email protected]
[mailto:[email protected]] On Behalf Of Ken Javor
Sent: Thursday, March 25, 2004 7:46 AM
To: Barry Rowland; EMC-PSTC
Subject: Re: Shielded Loop Antenna for HF
My estimation is that the FCC loops were built to sense stronger fields
than
what the original poster had in mind, and may not have sufficient
sensitivity at HF.
on 3/25/04 1:46 AM, Barry Rowland at [email protected] wrote:
>
> Fischer Custom Communications also have such products, which Agilent
> was including in their EMC pre-compliance test sets.
>
> Here's the page:
>
> http://www.fischercc.com/instrumentation/product_sensors.shtml
>
> Barry Rowland
> Vancouver BC
>
>
> On Wednesday, March 24, 2004, at 04:27 PM, Iain Summers wrote:
>
>>
>> Jacob, I am also measuring BPL in the UK. We have an automatic
>> Schaffner
>> loop but it is too noisy to get any good measurments. We have some
>> manual
>> tuned loops designed by the University of Herts in the UK by a
lecturer
>> there called Dave Lauder http://dragon.herts.ac.uk/~eleqdml/ If you
>> contact
>> him he may give you the spec.
>>
>> I would be interested to know what technique you will use. ie how do
>> you
>> propose to measure low signal levels in the near field. I am trying
to
>> obtain a sensitive E-field antenna to measure both E and H. I am
>> doing a
>> PHD and not complience measurement so I may have a different
>> requirement to
>> you.
>>
>> I would like to chat to you off-line in more detail if you are
>> interested.
>>
>> Iain
>> The Open University (UK)
>>
>> ----- Original Message -----
>> From: "Jacob Schanker" <[email protected]>
>> To: "EMC-PSTC" <[email protected]>
>> Sent: Wednesday, March 24, 2004 10:39 PM
>> Subject: Shielded Loop Antenna for HF
>>
>>
>>>
>>> Fellow Groupees: :)
>>>
>>> I am looking for suggestions on sources of shielded loop antennas
>>> good to
>> 30
>>> MHz.
>>>
>>> The usage will be for a study of radiation from a BPL (PLC) system.
>>>
>>> Any sources and recommendations, and anecdotal experiences, will be
>>> appreciated.
>>>
>>> Thanks,
>>>
>>> Jack
>>>
>>>
>>> Jacob Z. Schanker, P.E.
>>> Consulting Engineer
>>> 65 Crandon Way
>>> Rochester, NY 14618
>>>
>>> Tel: 585 442 3909
>>> Fax: 585 442 2182
>>> [email protected]
>>>
>>>
>>>
>>>
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>>
>>
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>
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