Waveguide_dummy_load.jpg
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Summary
| Description |
English:
A high power
microwave
dummy load
used for testing
waveguide
systems. A dummy load is a waveguide termination that absorbs all the microwave power applied to it without reflecting any, converting the microwaves to heat. It has heatsink fins to dissipate the heat. The flange visible on the righthand side is attached to a waveguide.
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| Date | |
| Source | Retrieved March 30, 2015 from Tele-Tech magazine, Caldwell-Clements Inc., Bristol, Connecticut, Vol. 11, No. 11, November 1952, p. 78 on American Radio History website |
| Author | Unknown author |
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Permission
( Reusing this file ) |
This 1952 issue of Tele-Tech magazine would have the copyright renewed in 1980. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here . Search of the Renewals for Periodicals for 1979, 1980, and 1981 show no renewal entries for Tele-Tech . Therefore the copyright was not renewed and it is in the public domain. |
Licensing
|
This work is in the
public domain
because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the
copyright was not renewed
. For further explanation, see
Commons:Hirtle chart
and
the copyright renewal logs
. Note that it may still be copyrighted in jurisdictions that do not apply the
rule of the shorter term
for US works (depending on the date of the author's death), such as Canada (70 years
p.m.a.
), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
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