Tried the dual antennas to subtract out the ambients, several times since the
explanation was good.
About 20 years ago. Unsat !!!
On Monday, May 2, 2022, 02:23:26 PM EDT, Ken Javor
<[email protected]> wrote:
Likely a totally different application than yours, but a long time ago on OATS
measurements, there was development of a two-antenna test where one was for the
actual measurement, but the other was pointed away to pick up the ambient, and
the idea was to subtract the ambient out, and leave only the EUT emissions.
It was controversial.
MIL-STD-826 (1964 – 1967) had radiated emission antenna set-up drawings showing
all antennas deployed simultaneously. In the days when each antenna had its own
receiver, if you had enough techs that could speed up the test significantly.
It should be noted that was unique to MIL-STD-826 and it did not survive into
MIL-STD-461.
I’m thinking in your specific application, the antennas should be separated by
some distance, so that they don’t affect each other. What that separation needs
to be will depend on the desired uncertainty in the measurement.
--
Ken Javor
(256) 650-5261
From: Patrick <[email protected]>
Reply-To: Patrick <[email protected]>
Date: Monday, May 2, 2022 at 2:00 PM
To: <[email protected]>
Subject: [PSES] Dual antenna during RE test ?
Hi All -
I'm wondering if there is any academic or practical literature on the use of
two antennas during an emissions test. For example, research or experiments on
the use of two DRH's above 1.0 GHz, side-by-side, one vertical, the other
horizontal.
Have any researchers looked at this?
Are there any experimental studies?
Thank you.
-Patrick
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