MIL-DTL-15370J
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use.
6.1.1 Directional couplers. Directional couplers may be used in conjunction with a radio-frequency source for
injecting a radio-frequency wave into a transmission line so that it flows in one direction only. Directional couplers
may also be used to sample a radio-frequency wave flowing in a particular direction in a transmission line while
accepting relatively insignificant portions of a radio-frequency wave flowing in the opposite direction.
6.2 Acquisition requirements. Acquisition documents must specify the following:
a.
Title, number, and date of this specification.
b.
c.
For naval applications, whether magnesium may be used in fabricating directional couplers (see 3.3.6).
d.
e.
Whether weatherproof caps are required (see 3.4.15).
Special marking required (see 3.21).
f.
Specify when alternate test for effective directivity is required (see 4.7.7.1).
g.
h.
Continuous wave power rating of primary line (see 4.7.10).
Packaging requirements (see 5.1).
i.
j.
If special or additional identification marking is required.
Whether the manufacturer performs the group B inspection or provides a certificate of compliance (see
k.
4.6.1.3).
l.
That directional couplers furnished under this specification are products which have been tested and have
6.3 First article. Information pertaining to first article inspection and approval of products covered by this
specification should be obtained from the acquiring activity or the qualifying activity: DLA Land and Maritime, Code -
VQE, P.O.Box 3990, Columbus, OH 43218-3990 (mail to: vqe.chief@dla.mil).
6.4 Definitions. For the purpose of this specification, the following definitions should apply.
6.4.1 Directional coupler. A directional coupler is a transmission-line component characterized physically by two
(or three, for certain bidirectional couplers) juxtaposed transmission lines and an associated coupling structure
through which a transfer of RF energy from one to the other is effected; its electrical behavior is characterized ideally
by such interaction between the two lines that excitation in a single direction in either line produces a response in the
companion line in one direction only.
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