COMMUNICATION PLUGS AND ADAPTERS
SIX POLE PLUG -
(C-3605) COMM ADAPTER
Early Swiss AF leather, cloth and hardshell helmets were made compatible with British communication systems.
XXXX TYPE plug was the standard configuration.
As used with early H-5 helmets while flying EKW
UK vs. US NATO PLUG
Following technical evolution, later version of SAF comm system were fitted with the so-called "UK (or European), NATO" plug - Type 671.
Other ( and current) comm systems are fitted with another type of plug, the NEXUS U-174, sometime referred as the "US NATO" Plug.
The UK plug will not fisically mate with the US one, the mating shaft being 0.4 mm wider.
Due to this, helmet comm harnesses were/ are configured accordingly.
In case of system's mismatches, adapters were provided.
Both comm harnesses versions were installed on the ejection seats of DH-100 / DH-115 Vampire and DH-112 Venom.
See the example below.
UK TO BELL PLUG EJECTION SEAT ADAPTER
installed on early version of DH-100/ DH-115 and DH-112 ejection seats.
H-3 (USN) to UK PLUG
(SE-015 COMM SYSTEM)
Fitted to H-3s during 1950 tests, in order to convert US (PL-54/ JK-26 and XXX/ JJ-048) comm system to UK Type 671 plug.
SE-015 was the Swiss designation of the British Standard Telephones & Cables Ltd. STR.9-X VHF communication system.
LOW TO HIGH IMPEDENCE ADAPTER
Also striking was the new nose cone, constructed in the 1970s, in which a new UHF radio was used Swiss Venoms were also subject to multiple improvement and upgrade programmes, including life extension modifications, the addition UHF ( Ultra High Frequency) radio sets
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