Chad,
For RE103, note that it tests emissions from the EUT RF port via a cable
and antenna :
/This requirement may be used as an alternative for CE106 when testing
transmitters //_*with their intended antennas*_//_*.*_/ (emphasis added)
Since all the emissions are radiated from the antenna (absent GROSS
cable or connector problems), how the equipemnt is set up otherwise
should make little or no difference. Check out Fig. RE103-1 etc.
CE106: This test is for spurious emissions present in the coax not ON
it, and given a decent coax, and proper attention to bend radius and
kinks, how it is laid out should make no difference. See Fig. CE106-1 etc.
Also note that these tests are *relative* measurements so absolute
amplitude doesn't matter..
Cortland Richmond
On 11/30/2012 1959, Airy, Chad wrote:
The RE103 discussion under Test Procedures in Appendix *A.5.18 (5.18),
*MIL-STD 461F, is somewhat puzzling to me. It states:
"*Test procedures: *Since the test procedure measures emissions
radiating from an antenna connected to a controlled impedance,
shielded, transmission line, the measurement results should be largely
independent of the test setup configuration. Therefore, it is not
necessary to maintain the basic test setup described in the main body
of this standard."
Except for the receive antenna, the statement is quite similar to the
corresponding statement in *A.5.6 (5.6) CE106: *
**
*"Test procedures: *Since the test procedures measure emissions
present on a controlled impedance, shielded, transmission line, the
measurement results should be largely independent of the test setup
configuration. Therefore, it is not necessary to maintain the basic
test setup described in the main body of this standard."**
**
It is logical to reason that there is no need to "maintain the basic
test setup" when conducting CE106. There are no antenna's in the
setup. Therefore chamber reflections are not an issue, so we expect
the results to be independent from that standpoint.
So I am apparently missing something. How could RE103 emissions
measured in either a anechoic chamber or OATS be independent of the
test setup configuration? What is really meant by "the basic test
setup described in the main body of this standard."?
And yes, I've checked 461E, which reads essentially the same.
*Charles D. (Chad) Airy***
*/General Atomics Reconnaissance Systems Group/*
16868 Via Del Campo Court | San Diego, CA 92127
wk: 858.762.6853 | fax: 858.762.5081
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