The AR approach of multiple frequencies at the same time from a single antenna
seems simpler.
--
Ken Javor
(256) 650-5261
From: Patrick
Reply-To: Patrick
Date: Friday, May 6, 2022 at 11:01 AM
To:
Subject: Re: [PSES] Dual antenna during RE test ?
Hi Bill and everyone-
I am
Ken - once again, I agree with you.
I don't see any path where dual antenna or dual tone can be used for
thresholding and debug
Finding any susceptibility moves a test to "normal" mode.
My motivation comes from the last RS test I was in... (really, every RS
test I've ever been in!)
It was 8 to
If the signal generators are inexpensive enough, more signals is more
efficient. Rather than two antennas, I again suggest a log-spiral, where you
get both polarizations at once.
With any of these “hurry up” schemes, if you see a susceptibility, you will
need to step back and use the
Hi Bill and everyone-
I am grateful for the insights.
I have two goals- first is two antennas for radiated emissions.
Second goal is dual antenna for radiated susceptibility(i.e. immunity ).
The insights on emissions are a great start.
Has anyone attempted dual antennas for
For RE, the single biggest improvement for schedule is to use a time domain or
FFT EMI receiver. Basically that is 1 second for each multi-MHz sweep. If
your platform has a limited number of microwave uplinks, the entire RE test
will take a few seconds. A log-spiral eliminates the need for
Generally apply reciprocity, if it does not emit, it is not susceptible !
So far the immunity tests have been boring, no issues !
Ps. for emissions, I do not play margin games. I kill (reduce) the sources to
the noise floor !
It follows that immunity should follow, and to date it has.
Lucky
Just to add a minor note to the thread:
The easiest way I use to determine if a signal is a "pure" clock
harmonic, is to simply punch down the RBW on the receiver/analyzer a
bunch of times. If it is a clock, you can reduce the RBW by a factor of
as much as you have, and the peak amplitude
Brings back memories! MANY moons ago, I ran an OATS in the foothills of
Colorado with lots of radio and TV ambients. Thought I'd give the two
antenna cancellation thing a quick experiment. I had one antenna on out
10 meter test mast and put a second one on the edge of our 3 meter
diameter
Multi-path emissions from the same source !
Weird stuff !
On Friday, May 6, 2022, 09:49:31 PM EDT, Brent DeWitt
wrote:
Brings back memories! MANY moons ago, I ran an OATS in the foothills of
Colorado with lots of radio and TV ambients. Thought I'd give the two antenna
cancellation
Yup, that works well.
ps. The opposite applies as well.
The 5G vs plane altimeters concern, increase the BW and watch adjacent channels
raise the noise floor.
Are plane altimeters "grandfathered" because they didn't know about future
adjacent emitters ?
And so they did not design their
In general ... proper design upfront and before testing anomalies, should
prevent all these considerations, and that is why we are here, to prevent the
extra work.
But when all our efforts don't get all the problems, roll up our sleeves and
get to work.
On Friday, May 6, 2022, 12:50:40
yes, agree.
two tones and single antenna is promoted by AR. So what is next level
improvement?
Can we speed tests even more with two antennas, simultaneous V ?
Wondering if 2x antenna plus 2x tone will cut test time by 4x.
On Fri, May 6, 2022, 09:08 Ken Javor wrote:
> The AR approach of
12 matches
Mail list logo
