1531.
1523.
1526.
1527.
4529.
20
(c) Components, accessories and sub-assemblies, specially
designed for the above equipment,
Amplifiers, oscillators and related equipment, as follows---
(a) Amplifiers designed to operate at frequencies in excesk of
500 mega Hertz,
(b) Tuned amplifiers having a bandwidth which exceeds 10 magaHerts or 10% of the mean frequency, whichever is less, except those specially designed for use in community television distribution systems;
(e) Untuned amplifiers baving a bandwidth which exceeds 10 megaHertz, but excluding those having a bandwidth up to 30 megahertz provided the power output does not exceed $ warts:
(d) Direct current amplifiers, amplifying by whatever means, having either a noise level (referred to the input circuit) of 10-16 watts or less or zero drift in 1 hour corresponding to a change in input power of 10-15 watts or less or both;
(e) Parametric amplifiers with a noise figure of merit of 5 decibels or less measured at a temperature of [7°C; para- magnetic amplifiers; other amplifier or oscillator devices which amplify or oscillate by means of stimulated electro- magnetic radiación (including but not limited to MASERS, LASERS and IRASERS), specially designed parts therefor, and any equipment containing such amplifiers, oscillators or devicek
Single and multi-channel communications transmission equip- ment, including line or radio terminal, modem, multiplex, and intermediate amplifier or repeater equipment, as follows-
(a) Employing analogue techniques, including frequency division multiplex (FDM), designed to deliver, carry or receive frequencies higher than 150 kiloHertz into, or in, a com- munications system, cxcept carrier communications ter- minals specially designed for power lines and operating at frequencies below 1.500 kilo Hertz:
(b) Employing digital transmission with analogue input and output, including pulse code modulation (PCM), designed for use on communication circuits, and speciallized test equipment therefor:
(c) Components accessories
sub-assemblies, specially
designed for the above equipment.
Communications cable, not elsewhere specißed,
All cypher machines, cryptographic or coding devices and equipment or both, and associated equipment, usable on any transmission system (telegraphy, telephony, facsimile, video, data), that is designed to ensure the secrecy of communications and thus prevent clear reception by any one other than the intended receiver.
Radio Testing Equipment.
1533.
1537,
1341.
1542.
21
Radio spectrum analyzers (being apparatus capable of indicat- ing the single-frequency components of multi-frequency oscillu- tions) as follows-
(a) Designed to operate at frequencies over 1,000 megaHertz; (6) Designed to operate at frequencies over 300 megaffertz and using interchangeable heads (ie. R.F. tuning units) and incorporating integral sweep facilities:
(c) Having a display bandwidth in excess of 12 mega Hertz; (d) Specialized components, accessories and parts therefor.
Electromagnetic waveguides and components therefor. follows-
(a) Rigid and dexible waveguides and components designed
for use at frequencies in excess of 12.5 gigaffertz: (b) Waveguides having a bandwidth ratio greater than 15:1;
(c) Waveguide components, as follows—
(1) Directionat couplers baving a bandwidth ratio greater than 1.5:1 and directivity over the band of 14 decibels or more;
(0) Rotary joints capable of transmitting more than one isolated channet or having a bandwidth greater than 5% of the centre mean frequency;
() Magnetic, including gyro-magnetic, waveguide com- poncats;
(d) Pressurized waveguides and specialized components
therefor,
(e) TEM mode devices, using magnetic, including gyro-magnetic
properties,
(A) TR and anti-TR tubes and components therefor, except those designed for use in waveguides operating at a peak power not exceeding 160 kilowatts and at a frequency of 10.5 gigaHertz or less which are in normal civit use for ground or macine radar.
Cathode-ray tubes, as follows-
(0) With a resolving power of 500 or more lines per inch (20 lines per millimetre) using the shrinking raster method of measurement;
(6) With writing speeds of more than 1,000 kilometres per
second:
(c) Alpha-numeric and similar display tubes in which a symbol-mask within the tube can be scanned to display any of the symbols on any part of the phosphor.
Cold cathode lubes and switches, as follows—
(a) Triggered spark-paps, having an anode delay time of 15 microseconds or less and rated for a peak current of 3,000 amps or more: specially designed parts therefor; and equipment incorporating such devices;