>-----Original Message-----
>From: Iain Summers [mailto:[email protected]]
>Sent: Wednesday, March 24, 2004 4:27 PM
>To: EMC-PSTC
>Subject: Re: Shielded Loop Antenna for HF
>
>
>
>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)
If cost is a somewhat secondary condition, then you might want to look at
Antenna Research Associates' Model BBH-500 magnetic field probe. This gadget
uses a thick, nearly 24" long ferrite rod, with a current probe around the
mid-point of the rod. The output of the CP is then passed through filters
and an amplifier. IIRC, bandwidth was 30 Hz to 30 MHz. This is the hottest
H-field probe I have ever seen.
Moving down the scale, you can find shielded magnetic loop antennas on eBay
for maybe $50 or so (YMMV). (Search for Stoddart or Empire or Fairchild or
Honeywell antennas.)
OTOH, you might want to look at Honeywell magnetoresistive detectors. I
bought a two-axis HMC-1002 chip to play with a few months ago. It has a max
field of +/- 2 Gauss, resolves down to tens of microgauss, and has a
bandwidth of DC to 5 MHz. Just feed the chip 5 VDC, and you get back a DC
voltage proportional to the H field. I'm not an expert on this technology,
but I think the magnetoresistive technology is very non-responsive to the
E-field, making this a very pure H-field sensor. And it only costs about
$20. See
http://www.ssec.honeywell.com/magnetic/products.html
Regards,
Ed
Ed Price
[email protected] WB6WSN
NARTE Certified EMC Engineer & Technician
Electromagnetic Compatibility Lab
Cubic Defense Applications
San Diego, CA USA
858-505-2780 (Voice)
858-505-1583 (Fax)
Military & Avionics EMC Is Our Specialty
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