Type: radio-relay link equipment, capable of carrying up to 4 duplex telephone lines.

Usage: as a single link line-of-sight paths up to 50 miles long, or with multi-carrier equipment, up to 20 miles over line-of-sight paths. It could also be operated in a "multi-hop" role, with up to 3 hops possible carrying 4 telephone circuits, plus an "engineering" link as well.

Frequency range: 4.58 – 4.86 GHz, continuously tuned.

Modulation: FM with a deviation of 500KHz. The modulation bandwidth is 300Hz to 60KHz.

Rx circuitry: single conversion superhet, with an IF of 40MHz. The input stage is a crystal mixer, fed by a CV485 klystron local oscillator, whose frequency is controlled by an AFC loop. There is an alarm system built in to alert the operator to loss of an incoming carrier.

Tx circuitry: RF is produced by a CV485 klystron in a tuned cavity. This is frequency modulated by a two-valve push-pull amplifier.

Power requirements: a PSU included with the equipment supplies a stabilised 370 volt HT line at 80mA, and runs off AC mains, at 100 – 125, 200 – 250 volts, 45 – 65 Hz.

Aerials: two identical antennas are used for Tx and Rx. Each consists of a half-wave dipole, mounted at the focus of a 16" parabolic dish.

Notes: I have never seen this gear in "real life". I wonder if anyone owns a system, or if this is another of those equipments of little interest to amateurs, and which we are destined to only read about in the books?