G 84
CAP. 60]
Import and Export (Strategic Commodities) Regulations
[1988 Ed.
[Subsidiary]
(i) Fixed frequency and tunable pulsed magnetrons and cross-field amplifier tubes which are in normal civil use in equipment which may be exported under the terms of these Lists, as follows:
(1) Magnetrons designed to operate at frequencies below 3 GHz with a maximum rated peak output power of 5/MW or less, or between 3 to 12 GHz with the product of the maximum rated peak output power (expressed in kilowatts) and the frequency (expressed in Gigahertz) less than 4 200 and a “frequency tuning time” more than 100 milli-seconds;
Technical Note:
"Frequency tuning time" is the time required to change the operating frequency from a starting frequency, through the maximum frequency, through the minimum frequency, and return to the starting frequency i.e. one complete tuning cycle.
("Frequency tuning time": T
Fp: dither rate.)
1
2F
(2) Crossed-field amplifier tubes designed to operate at frequencies below 4 GHz with a maximum rated average output power of 1.2 kW or less, a bandwidth of 200 MHz or less and a gain of less than 15 dB;
(ii) Fixed frequency continuous wave magnetrons designed for medical use or for industrial heating or cooking purposes operating at a frequency of 2.375 GHz ± 0.05 GHz or 2.45 GHz +0.05 GHz with a maximum rated output power not exceeding 6 kW or at a frequency lower than 1 GHz, with a maximum rated output power not exceeding 35 kW;
(c) Tubes which utilise interaction between a beam of electrons and microwave elements or cavities and in which the electrons travel in a direction parallel to the applied magnetic field (e.g. klystrons or travelling wave tubes), except
(i) Continuous wave tubes having all of the following characteristics:
(1) Designed for use in civil ground communication;
(2) An instantaneous bandwidth of half an octave or less, i.e. the highest operating frequency is not higher than 1.5 times the lowest operating frequency:
(3) The product of the rated output power (expressed in W) and the maximum operating frequency (expressed in GHz) of no more than 300;
(4) An operating frequency no higher than 20 GHz;
(5) No multiple grid electron guns; and
(6) Collectors with no more than two depressed stages;
(ii) Pulsed tubes, having all of the following characteristics:
(1) For civil applications;
(2) An instantaneous bandwidth of half an octave or less, i.e. the highest operating frequency is not higher than 1.5 times the lowest operating frequency;
(3) Collectors with no more than two depressed stages; and
(4) Either of the following:
(a) A peak saturated output power not exceeding 1 kW, an average output power not exceeding 40 W and the operating frequency not exceeding 10 GHz, or
(b) A peak saturated output not exceeding 100 W, an average output power not exceeding 20 W and the operating frequency between 10 and 20 GHz,
(iii) Pulsed tubes, having all of the following characteristics:
(1) For civil applications;
(2) Designed for fixed frequency operation;
(3) Operating frequencies below 3.5 GHz;
(4) A peak output power of 1.6 MW or less; and
(5) An operating bandwidth of less than 1 per cent;