SCR-189
The SCR-189 was a mobile Signal Corps Radio tested by the United States Army before World War II. It was designed for armored forces, and mounted in the Six Ton Tank M1917. The original production run of these tanks included 50 "radio tanks" but the original radio components are unknown, so what or how many tanks were fitted with the SCR-189 also appears to be unknown.[1][2]
| SCR-189 | |
|---|---|
 SCR-189 in T1 Scout Car | |
| Type | Vehicle radio |
| Place of origin | United States |
| Service history | |
| In service | standardized 1933 |
| Used by | US Army |
| Production history | |
| Designed | 1932 |
| Variants | 1 |
| Specifications | |
| Armor | none |
Main armament | none |
Use
Scr-189 in T1 Pontiac Scout Car
An early tactical vehicle radio, it was the first Army set to utilize the Superheterodyne receiver. As the M1917 tank was phased out, the new M1 Combat Car and M2 Light Tank were equipped with SCR-189's. The SCR-189 was replaced by the SCR-245 in 1937.[3][4]
Components
- BC-175 Receiver
- BC-176 Transmitter CW/voice, 2.200 kHz, to 2.600 kHz at 7.5 Watt, range 8 Miles
- BC-177 Control box
- BC-206 Control box
- PE-48 Power supply
- Battery box BX-3 (Battery BA-27)
Variants
- SCR-190 Receiver only set
gollark: Something is very O(n) here and I have about 300 search results for bee.
gollark: Site-3371.
gollark: I mean, postgres has very good caching, so it gets fairly fast if I search for bees multiple times, but whyyyy?
gollark: Yes.
gollark: ```sqlnonlocality=# EXPLAIN ANALYZE SELECT url, ts_rank(fts, query) AS rank, ts_headline(fts::text, query, 'MaxWords=60') FROM pages, websearch_to_tsquery('bee') query WHERE fts @@ query ORDER BY rank LIMIT 1; QUERY PLAN -------------------------------------------------------------------------------------------------------------------------------------------------- Limit (cost=860.79..861.06 rows=1 width=96) (actual time=35935.590..35935.594 rows=1 loops=1) -> Result (cost=860.79..874.83 rows=52 width=96) (actual time=35935.587..35935.589 rows=1 loops=1) -> Sort (cost=860.79..860.92 rows=52 width=178) (actual time=35934.109..35934.111 rows=1 loops=1) Sort Key: (ts_rank(pages.fts, query.query)) Sort Method: top-N heapsort Memory: 25kB -> Nested Loop (cost=0.25..860.53 rows=52 width=178) (actual time=444.148..35932.932 rows=349 loops=1) Join Filter: (pages.fts @@ query.query) Rows Removed by Join Filter: 10272 -> Function Scan on websearch_to_tsquery query (cost=0.25..0.26 rows=1 width=32) (actual time=0.038..0.041 rows=1 loops=1) -> Seq Scan on pages (cost=0.00..728.95 rows=10495 width=142) (actual time=10.189..289.581 rows=10621 loops=1) Planning Time: 0.184 ms Execution Time: 35935.637 ms(12 rows)```
References
- United States. National Bureau of Standards (1927). Standards yearbook. U.S. Govt. Print. Off. pp. 87–.
- United States. War Dept. Technical Regulations: TR.
- R. P. Hunnicutt (1 June 1992). A History of the American Light Tank: Stuart. Presidio. ISBN 978-0-89141-462-9.
- Clark, Chad G. (1998). "RADIO TO FREE EUROPE: ARMORED FORCE RADIO DEVELOPMENT, GREAT BRITAIN AND THE UNITED STATES 1919-1941". Defense Technical Information Center (DTIC). US Government/University of Nebraska. Archived from the original on March 3, 2016. Retrieved 27 December 2018.
The SCR-189 and Mechanized Cavalry, 1935-1938
External links
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