G 62
CAP. 60]
Import and Export (Strategic Commodities) Regulations
[1988 Ed.
[Subsidiary]
6.
Passive hydrophone sensitivities cited in this item are based on sensitivity being defined as 20 times the logarithm to the base 10 of the ratio of rms output voltage to a 1 volt reference, when the hydrophone sensor is placed in a plane wave acoustic field having an rms pressure of 1 micropascal. For example, a hydrophone of -160 dB (reference 1 volt per micropascal) would yield an output voltage of 10-7 volts in such a field, while one of -180 dB sensitivity would yield only 10-9 volts output.
Not used.
7.
8.
Not used.
9.
Not used.
IL 1514
IL 1516
IL 1517
Pulse modulators capable of providing electric impulses of peak power exceeding 20 MW or of a duration of less than 0.1 microsecond, or with a duty cycle in excess of 0.005; and pulse-transformer, pulse-forming equipment or delay lines being specially designed components of such modulators.
Receivers, as follows, and specially designed components, accessories and "specially designed software" therefor
(For instruments using time compression of the input signal or FFT techniques associated with receivers, see Item IL 1533(1))
(a) Panoramic radio receivers (which search or scan automatically a part of the electromagnetic spectrum and indicate or identify the received signals); except ancillary equipment for commercial receivers with which the frequency searched does not exceed a bandwidth of 20 MHz or does not incorporate a raster or storage display capability;
(b) Digitally-controlled radio receivers, whether or not computer controlled, which search or scan automatically a part of the electromagnetic spectrum, in which the switching operation takes less than 10 milliseconds, and which indicate or identify the received signals, except non-ruggedized, digitally-controlled, pre-set type radio receivers designed for use in civil communications which have 200 selective channels or fewer (for digitally-controlled radio receivers using frequency synthesizers, see also Item II/1531);
(c) Receivers for "spread spectrum" and "frequency agile" systems having a total
transmitted bandwidth which is:
(1) 100 or more times greater than the bandwidth of any one information channel;
and
(2) In excess of 50 kHz,
(d) Receivers which incorporate digital signal processing, except receivers specially designed for internationally allocated civil frequency bands only and which do not permit user-accessible reprogrammability of the digital signal-processing circuits. Technical Notes:
1. "Spread spectrum" is defined as the technique whereby energy in a relatively narrow-band communication channel is spread over a much wider energy spectrum under the control of a random or pseudo-random bit stream. On receipt, the signal is correlated with the same bit stream to achieve the reverse process of reducing the bandwidth to its original form. By allocating different bit streams to different subscribers transmitting simultaneously, significantly greater use can be made of available bandwidth.
2. "Frequency agility" (or frequency hopping) is another form of "spread spectrum" in which the transmission frequency of a single communication channel is made to change by discrete steps under the control of a similar bit stream.
(See also Item IL 1517 (c).)
Note:
This Item is not intended to cover signal analysers (see Item IL 1533) or field strength meters (see Item IL 1529).
Radio transmitters, except radio relay communications equipment (for which see Item IL 1520), as follows, and specially designed components therefor:
(a) Transmitters or transmitter-amplifiers designed to operate at output frequencies greater than 960 MHz;