No clue as to what your thinking is about using multiple antennas in testing.
We used 4 masts, high band and low band at 3 m and 10 m..
NSA came out fine. Been doing it for about 3 or more decades.
If ya gots the money, spend it on more hardware.
One radiated run in about 30 minutes cover high and low band at 3m and 10m.
All interesting freq noted for followup.
ps. Even tho' all document the azimuth and altitude, no one uses it later.
Useless info to fill out. Every test setup is different, even using the same
equipment.
On Monday, May 2, 2022, 06:10:34 PM EDT, David Schaefer
<[email protected]> wrote:
Prescans you could do vertical and horizontal at the same time, but the problem
with final data is you need to maximize. The worst turntable angle for V and H
is probably different, so you can’t maximize the antenna height at the same
time.
There is also the issue of NSA – was NSA data taken with the 2nd antenna and
mast in the chamber? And with them both moving how will that affect results?
I heard the Keysight team in California was planning on taking some data to
investigate, but that was pre-covid so it probably got put on the back burner.
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From: Paasche, Dieter [mailto:[email protected]]
Sent: Monday, May 2, 2022 3:59 PM
To: [email protected]
Subject: Re: [PSES] Dual antenna during RE test ?
CAUTION:This email originated from outside of Element Materials Technology. DO
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about this email.
Hi,
I have seen that too at HP in Sacramento, CA. One antenna was in Vertical
polarization and the other in Vertical. In my personal opinion, it is Ok for
pre-scan, but I think it is complicated for the final scan. I think you still
have to test each frequency and polarization one by one.
Sincerely,
Dieter Paasche
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From: Manny Barron <[email protected]>
Sent: Monday, May 02, 2022 4:46 PM
To: [email protected]
Subject: Re: [PSES] Dual antenna during RE test ?
| |
CAUTION:This email originated from outside of the organization. Do not click
links or open attachments unless you recognize the sender and know the content
is safe.
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Back around 1998 when I worked for Tandem Computers (purchased by Compaq in
1998, then purchased by HP in 2001), I visited the HP EMC Lab in Washington
state (I went to see their 10m chamber since we were thinking of getting a 2nd
10m chamber, which we did).
Well they used two antennas connected to two separate receivers for their RE
tests. Can't remember if it was horizontal and vertical OR if it was two
frequency ranges (30-300MHz and 300-1000MHz), but it was definitely two
antennas and two receivers. At that time they were also experimenting with 4
antennas but I think still 2 receivers, but don't know if that was actually
implemented. They wrote their own custom test software to handle the multiple
antenna / receiver combinations. The guy who ran that HP EMC test lab was Bob
Dockey who later went to Philips Medical, if you can find him maybe he can
elaborate on their RE test system of the time.
A year later we (now Compaq) purchased a new 10m chamber (now we had two), so I
was thinking about the two antenna RE test method as well. But then in 2002
(now HP), HP shut down two full EMC labs with three 10m chambers (all within 1
mi area in Cupertino, CA), and laid off almost all EMC personnel, something
about too many labs and equipment after the corporate merger. They ended up
taking equipment to be tested to their Roseville, CA EMC test lab, about 100
miles north.
So I never got a chance to research and implement the 2 antenna RE test system.
Had all the equipment, but it was too late.
Manny Barron
On Mon, May 2, 2022 at 11:00 AM Patrick <[email protected]> wrote:
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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