choke ring

choke ring

[′chōk ‚riŋ]
(ordnance)
Metal ring used in the reaction chambers of certain recoilless weapons to control gas escape; the same function is carried out by throat rings, throat blocks, and restricting plugs in other types of recoilless weapons.
References in periodicals archive ?
GNSS reference station receivers with antenna Choke Ring
Shooting my own Dead Ringer, which was thought to be a wad stop design with a full 360-degree interior choke ring, the payload becomes trapped while still encased in the plastic wad because the edges of the wad pedals hit the ring and turn inward, developing a crimp of sorts that hold the shot inside of the wad.
Trimble will supply 295 NetR8 GNSS CORS receivers and GNSS Choke Ring antennas for the project.
GPS 600 Series Antenna is a dual frequency antenna that achieves less than 1 millimeters offset between L1 and L2 phase centers without a choke ring by replacing conventional patch antenna designs with NovAtel's patent pending Pinwheel Technology -- an aperture coupled slot array configuration.
The ANT-3001BR is a high-performance geodetic choke ring antenna for use in reference station applications.
The Trimble 4700 Micro-centered antenna has sub-millimeter phase center repeatability, reduced multipath and superior low elevation satellite tracking when compared with Choke Ring antennas.
Topcon will supply 14 sets of Net-G3 CORS receivers and CR-G3 GNSS choke ring antennas.
Topcon will supply 132 campaign-mode (portable) GNSS CORS receivers and GNSS choke ring antennas for CMONOC.