1507.
1510.
1514.
1516
1517
18
"Jamming" apparatus specially designed to jam or otherwise interfere with radio reception; and specialized parts therefor.
Location apparatus underwater; apparatus for detecting or Jocating objects under water by magnetic or acoustic or ultrasonic methods, and specialized components of such apparatus, except-
(a) Marine depth sounders of a kind used solely for measuring the depth of water or the distance of submerged objects. fish or whales vertically below the apparatus;
(b) Specific types of horizontally operated fish or whale finding
equipment.
Pulse modulators capable of providing electric impulses of peak power exceeding 200 kilowatts or of a duration of less than 1/10th micro-second, or with a duty cycle in excess of 0.002; and pulse-transformer, pulse-forming equipment or delay lines being specialized parts of such modulator.
Panoramic radio receivers as followe
(a) Panoramic radio receivers (being receivers which search automatically a part of the radio-frequency spectrum and indicate the signals received); except aucillary equipment for commercial receivers, with which the frequency spectrum searched does not exceed either 20% of the intermediate frequency of the receiver or +2 megaHertz,
(b) Specialized parts for the panoramic radio receivers embar-
goed by this item.
Radio transmitters and computients, except radio relay com- munications equipment, as follows-
(a) Transmitters or transmitter amplifiers designed to operate at output frequencies greater than 235 megahertz, other than......
(i) Television broadcasting transmitters and amplifiers therefor operating between 470 and 960 megahertz;
(i) Frequency-modulated and amplitude-modulated ground communications equipment required for use in the land mobile service and operating in the 420 to 470 megaHertz band, with a power output of not more than 25 watts for mobile units and 100 watts for fixed units;
(ii) Amplitude-modulated radiotelephone equipment used for search and rescue work operating on a frequency of 243 megaHertz with a carrier power not exceeding 100 milliwatts,
(b) Transmitters or transmitter amplifiers designed to provide
any of the following features--
(i) Any system of pulse modulation (This does not include amplitude frequency or phase modulated television or telegraphic transmitters);
(i) Rated for operation over a range of ambient tem- peratures extending from below -40°C, to above +55°C..
1318.
1519.
1520.
19
(ii) Designed to provide a multiplicity of alternative output frequencies controlled by a lesser number of piezo- electric crystals, except equipments in which the output frequency is selected only by manual operation either on the equipment or on a remote control unit and-
(1) those forming multiples of a common contral
frequency, or (2) those in which the output frequency is a multiple of a common frequency which is not less than 1/1,000th part of the oscillator frequency and is in steps of kilo-Hertz or greater;
(c) Components and sub-assemblies, including but not limited to intermediate-frequency and power amplifiers and their parts, modulators and modulation amplifiers, aerials, their filters and their connecting devices, control equipment placed in racks, and maintenance equipment, specially designed for transmitters covered by sub-items (6) and (5) except quartz crystals which are covered by item 1587, Group G.
Telemetering and telecontrol equipment suitable for use with aircraft (piloted or pilotless), space vehicles or weapons (guided or unguided) and test equipment specially designed for such equipment.
Data communication equipment employing digital transmission with digital input and outppi, including telegraphic and data transmission, having any of the following characteristics-
(0) Designed for operation at a date signalling rate in ble per second, excluding servicing and administrative channels. numerically exceeding either-
0) 1,200; or
(ii) 65% of the channel for sub-channel) bandwidth in Hertz:
(b) Employing automatic error detection and correction systems
having both of the following characteristics-
(0) Re-transmission is not required for correction; (i) Transmission speed exceeding 300 bits per second;
(c) Components, accessories And sub-assemblies, specially
designed for the above equipment.
Radio relay communications equiprecnt, as follows--- (a) Equipment employing tropospheric, ionospheric or meteoric scatter phenomena, and specialized test equipment therefor: (6) Other radio relay equipment designed for use al fre- quencies exceeding 300 mega Hertz, except equipment having none of the following characteristics-
d) Designed for
megaHenz,
at frequencies exceeding 470
(ii) Power output exceeding 10 watts;
(i) Signal bandwidth at the input to the modulator exceeding the limit specified in sub-item 1523(a);
(iv) For other than fixed service:
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