________________________________
From: Donald McElheran [ mailto:dmcelhe...@rossvideo.com]
Sent: Wednesday, February 23, 2005 7:24 AM
To: emc-p...@ieee.org
Subject: Radiated Emissions > 1GHz
All:
I am considering the purchase of a HP 8569B Spectrum analyzer for
pre-compliance radiated emission measurements beyond 1GHz. The unit is a very
reasonably price and would appear to be satisfactory for pre-compliance
requirements. Intend to configure the SA with a Low noise 1 GHz - 18 GHz
pre-amp and 1-18 GHz horn antenna.
Wondering if any one on the forum had any experience with this
particular SA and whether or not there are any issue which we should consider
or be cautious of.
Donald MCElheran
Product Compliance
Don:
That analyzer should work out OK for pre-compliance testing. However, if you
do plan to test all the way to 18 GHz, you might find that the typical
double-ridge horn antenna has a rather high antenna factor above about 15 GHz.
I stop using my EMCO 3115 at 12 GHz, where I switch over to a home-made
pyramidal horn to continue up to 18 GHz. As an example, my EMCO 3115 has an
antenna factor of 47.5 dB at 18 GHz, but my pyramidal horn has a factor of
35.7 dB. That 12 dB advantage helps a lot! BTW, remember to put your pre-amp
at the antenna output terminal for best performance.
Ed
Ed Price
ed.pr...@cubic.com 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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