EMI/RFI antennas in general, not just loops, are designed for maximum
bandwidth and not efficiency. A capacitor tuned loop is the opposite end of
the spectrum from an amplified LF/MF/HF loop. An EMI test requires sweeping
broad frequency spans, and the less bandswitching, or tuning of the antenna
necessary the better, because that makes the test more efficient. The
efficiency and selectivity that are prized by someone trying to pull in a
weak signal in the presence of a strong one is just the opposite of the
efficiency desired by the EMI test engineer.
From: keith beesley <keith1226@...>
Reply-To: loopantennas@...
Date: Sun, 24 Jun 2007 01:56:34 -0700 (PDT)
To: loopantennas@...
Subject: Re: [loopantennas] Anyone know abt these LF-MW-HF loops?
Mark,
I've seen those military surplus loops on Ebay from
time to time. I'm no expert, but I don't see why they
wouldn't work on at least MW and SW if tuned to the
proper frequency. $600. is a little steep for me.
There's also a guy in Australia (PK's Loop Antennas)
who sells MW loop antennas for around USD$50. I have
one and it works very well; can pull in DX stations on
any average radio. Would probably work great with a
higher-end radio. He also makes LW loops and will
custom-build them for other frequency ranges if asked.
Keith
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What's with these things? Can they/why can't they be
used for LW/MW/SW
listening?
-Mark/airchecklover
