1964_IMPORT_AND_EXPORT_(STRATEGIC_COMMODITIES)_REGULATIONS — Page 73

1988 Ed.]

Import and Export (Strategic Commodities) Regulations

[CAP. 60

G 73

[Subsidiary]

IL 1531

Technical Notes:

1.

"Comb frequency generators" (sub-item (b)(2)) are generally understood to be devices which generate a spectrum of harmonics.

2. "Swept-frequency network analyzers" as understood in sub-item (b)(3)(i) above involve the automatic measurement of equivalent circuit parameters over a range of frequencies. This involves swept-frequency measurement techniques but not CW point-to-point measurements.

3. "Amplitude and phase receivers” (sub-item (b)(3)(ii)) /åre instruments capable of measuring the amplitude of a microwave signal or the amplitude of two microwave signals and the relative phase between them. The principal application of these instruments is the measurement of near and far zone phase and amplitude antenna patterns. They can also be used for measurement of microwave device and components characteristics. In general, they are more sophisticated and sensitive (better than -- 100 dBm) than phase and impedance measuring instruments such as RF vector impedance meters and vector voltmeters. They also feature wide dynamic range (80 dB) and very good linearity (approximately ±0.25 dB), "Frequency (heterodyne) converters" (sub-item (b)(3)(iii)) down convert an unknown frequency by mixing with an accurately known frequency. The accurately known frequency is developed by multiplication of a crystal-derived reference which is passed through a harmonic generator. By mixing the appropriate harmonic and the unknown frequencies, an accurate third frequency results.

4.

5.

6.

"Transfer oscillators" (sub-item (b)(3)(iii)) are based also on the property of harmonic mixing. Differences exist in that a local oscillator is utilized whereas a crystal-derived reference frequency is utilized in the case described in Note 4 above. The unknown frequency is mixed with the local oscillator (LO) and the two are phase-locked by tuning the LØ. The LO can then be measured by a counter. "User-accessible programmability" as used in sub-items (b)(4) and (b)(5) above is meant defined as the facility allowing a user to insert, modify or replace “programmes" by means other than:

(a) A physical change Ẩn wiring or interconnections; or

ction

(b) The setting of function controls including entry of parameters.

7. "Burst frequency measurement" counters (sub-item (c)(3)) contain special gating circuits which start only when the input signal is present and stop counting at the completion of the burst.

Note:

For signal analyzers, see Item IL 1533;

For microwave equipment, see also Item IL 1537;

For analogue-to-digital converters, other than digital voltage measuring instruments, see Item IL 1568ƒ

For frequency synthesizers, see Item IL 1531.

See also Items JL 1355, 1485(j) and Item ML 18 on the Munitions List.

"Frequency synthesizers" (and equipment containing such "frequency synthesizers") as follows-

(a) "Frequency synthesizers" containing frequency standards embargoed by Item IL 1729(a)(1) or temperature-compensated crystal oscillators covered by Item IL 1587(c);

(b) Instrument "frequency synthesizers" and synthesized signal generators, and specially designed components and accessories therefor, designed for ground use, producing output frequencies whose accuracy and short- and long-term stability are controlled by, derived from, or disciplined by the input frequency or internal master standard frequency, and having any of the following characteristics:

(1) A maximum synthesized output frequency of more than 550 MHz;

(2) Any of the following noise characteristics:

(1) A single sideband (SSB) phase noise better than -120 dBc/Hz when

measured at a 20 kHz offset from the carrier frequency;

(ii) A single sideband (SSB) phase noise better than -106 dBc/Hz when

measured at a 100 Hz offset from the carrier frequency;