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Australia, and are now available through Radio Manufacturing Engi-neers.

Designed by łan Hill and Associates, all transmitters arc supplied as 19** rack mounted units and 19” cabinets can be supplied as an option.

Some of the othcr features include overtemperature, VSWR and ovcrvolt-age protection, AM stereo input, all routine adjustments via the front panel, main pług in PC boards and remote or local operation with status memory. They also havc a fault memory after mains faii.

Further information is available from Radio Manufacturing Engineers, Unit A, 30-32 Skanatt Street, Auburn 2144.

Variable ratio F0 coupler

A single-mode, variable-ratio coupler for fibrę optics has bcen developed by the fibrę optics division of Sifam.

The evanesccnt wave coupler can be supplied for operating wavelengths of 633, 820, 1300 and 1550nm and allows the coupled power to bc adjusted to any valuc in the rangę of 0 to 80%. Tuning is carried out through a micrometer ad-juster.

Designed primarily for research proj-ects, it is said to bc particularly suitable for use where fme tuning of the split ratio is required — for examplc in fibrę ring resonators. Exęess loss is claimed to be less than 0.5idB, with directivity better than -50dB, over the operating rangę.

Built into a sturdy aluminium-alloy case with a mounting flange, the device has an operating temperaturę rangę of 15°C to 30°C, though it may be stored in temperatures from -5°C to +50°C.

In August 1986 Sifam announced its entry into the fibrę optics field and the manufacturc of a rangę of standard single-mode cbmponcnts such as fused couplers, splitters and laddcr couplers.

The variable-ratio coupler is the latest development from the “teaching company” partnership established by Sifam with Strathclyde University in the UK.

For further information contact C & K Electronics (Aust), 55 High Street, Harris Street, Harris Park 2150.

AM transmitters

A rangę of all solid State AM transmitters covering the rangę 70W to IkW, wholly designed and manufactured in

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Panel mounting fuseholders

• Sifam has introduccd a new rangę of pancl-mounting fuseholders. The ad-vanced design is a new addition to the existing rangę of panel components, and is aimed at complementing the styling and finish of meters, knobs and push-buttons manufactured by Sifam. The design conforms in every respcct to estab-lish fuseholder practice for fitting and performance.

There are two basie types, with Iow or high front-of-panel profile to suit re-quirements for minimum projection at the front or at the rear. Both types are available for *‘d” hole or keyed hole-mounting and can accommodate a panel thickness from 0.5 to 5.0mm (4.5mm with sealing).

Moulded in high grade glass-fillcd polyester for the base and nylon for the carrier, with a finely-textured matt black finish, the fuseholders are rated up to 10A/250V. They are SEMKO ap-proved and comply with IEC 257 for a 5 x 20mm fuses, and are touch and finger