SAE AE4 and EUROCAE WG-14
SAE ARP5583/EUROCAE ED-107 Revision Task Group
Change Proposal Form
(One major comment per form. Shaded blocks for committee use only.)
AE4/WG-14 Paper Number:
Date:
ARP5583/ED-107 Section:
HUG-CP-B-042
July 31, 2008
6
Author’s Name, Affiliation, and E-mail:
Paragraph:
Page:
Dave Walen, FAA, dave.walen@faa.gov
6.5.2.c.
89
Reason for Change:
Test laboratories that perform integrated system tests at high peak field strengths may achieve these
levels by moving the transmit antenna closer to the system under test. DO-160 section 20.3 provides
specific guidance that limits how close the antenna can be to the system under test. However, the user
guide in paragraph 6.5.2.c does not provide consistent guidance. It states that ‘The placement [of the
antenna] is determined by setting the separation distance between the antenna and the EUT at distances
equal to or greater than the far field boundary of the antenna. The most common distance is 1 meter.’
However, for most antennas the far field boundary is greater than 1 meter. And test laboratories have
been moving the antenna closer than 1 meter, and simply noting an exception to DO-160 section 20.3.
Proposal Disposition:
Accepted As Written
Withdrawn
Accepted As Modified
Rejected
Other
Rejection Reason/Comments:
Proposal Deferred To:
AE4/WG-14 Task Group Concurrence
Proposal Disposition By:
Date:
Revise From:
c.
Radiating Antenna Position - When planning for a radiated susceptibility test, special
consideration should be given to the placement of the transmitting antenna relative to the EUT.
The placement will drive the size of the area needed to conduct the testing. The placement is
determined by setting the separation distance between the antenna and the EUT at distances
equal to or greater than the far field boundary of the antenna. The most common distance is 1
meter. The far field boundary is calculated by the formula (2*D)2/λ, where D is the largest
dimension of the antenna, and λ is the wave length of the lowest frequency of interest for that
antenna. If the test is to be conducted in shielded enclosures with anechoic material, then the
antenna should be at least 0.3 m away from the absorber surfaces.
SAE ARP5583/EUROCAE ED-107 Change Proposal Form
12/2007
Proposal Page Number: 1 of 2
Revise To:
c.
Radiating Antenna Position - The separation distance between the antenna and the EUT and
wiring should be one meter or greater. If the transmitting antenna being used is a pyramidal horn or
similar radiator, as the dimensions of the antenna become small and the frequency of interest becomes
higher, it is permissible to move the antenna closer to the EUT and wiring than one meter. This can only
be done when the far field distance of the transmitting antenna is less than one meter. The position of the
transmitting antenna relative to the EUT must remain equal to or greater than the far field distance of the
transmitting antenna. If the far field distance of the antenna is greater than one meter then the standard
one meter separation should be used. The far field distance is calculated by the formula (2*D)2/λ, where
D is the largest dimension of the antenna, and λ is the wave length of the lowest frequency of interest for
that antenna. If the test is to be conducted in shielded enclosures with anechoic material, then the
antenna should be at least 0.3 m away from the absorber surfaces.
As Modified Text:
SAE ARP5583/EUROCAE ED-107 Change Proposal Form
12/2007
Proposal Page Number: 2 of 2