Microwave Broadband Radio Relay Equipment SPO 5558 A & B

S.H.F. (Super high frequency or Microwave) (6 GHz band) Broadband Radio Relay Equipment was used for long and short haul broadband telephony and video links through out the world. The equipment was transistorised except for a Travelling Wave Tube (TWT), type TWC-10, used for the transmitter, RF output and tube rectifiers in the TWT high voltage power supply.

Radio Characteristics

Operating Frequencies: 5925 MHz - 6425 MHz, (C.C.l.R. recommended).
Transmitter Output: 10 watts nominal.
Transmitter Input: 0:3 volt r.m.s. (70 MHz).
Receiver Bandwidth: ± 20 MHz at 3db points.
Receiver Output: 0.5 volt r.m.s. (70 MHz).
l.F. Input and Output Impedances: 75 Ω.

Baseband Characteristics Telephony

Telephony Capacity: (A) Up to 1 800 channels., (B) Up to 960 channels.
Baseband Frequency: (A) 300 kHz to 8248 kHz., (8) 60 kHz to 4028 kHz.
Continuity Pilot: (A) 9023 kHz (B) 8500 kHz.
Gain Stability: ± 0.2 db over one day.± 0.5 db over one month.
Pre-emphasis: To C.C.l.R. Recommendations.
Mean Deviation: (A) 140 kHz r.m.s. at channel, test level, (B) 200 kHz r.m.s. at channel test level.

Baseband Characteristics Television

Capacity: (A) One high def. TV colour + 1 sound channel or TV monochrome + 4 sound channels.
Capacity: (B) One high def. TV colour + 1 sound channel or TV monochrome + 1 sound channel.
Video Input and Output Impedances: 75 Ω.
Video Input level: Nominal 1 volt peak-to-peak, (Adjustable ± 3 dB relative to nominal).
Video Output level: Nominal 1 volt peak-to-peak (Adjustable ± 3 dB relative to nominal).
Pre-emphasis: To C.C.l.R. Recommendations.
Sound Channel, Sub-carrier Frequencies: (A)7.00 MHz, 7.36 MHz, 7.74 MHz and 8.14 MHz. (B) 7.5 MHz.

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