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A - low power portable, man portable sets usually primary battery supply. B - low power vehicular - secondary battery supply C - medium power vehicular - secondary battery or AC mains supply D - high power vehicular or static - AC mains or generator supply E - very high power static installations (usually) may be transportable in sections. First digit 1-3 HF (2 - 30 MHz) 4-6 VHF (30 - 400 MHz) 7-9 UHF (over 400 MHz) Second digit is the "design sequence number" of the equipment, starting at zero (low numbers are unlikely to get past trials unless they were re-designated existing kit, such as the E10 (originally Wireless Set No.15, a long range (2kW low power, up to 30kW on HP)). So you get a slightly more logical arrangement of: SR A13 (Station Radio A13) - low power HF for where VHF is unsuitable. SR A40 - low power infantry VHF (also A41, A42 and A43, all different). SR B47 - low power vehicular VHF set SR B70 - UHF (really SHF) radio relay SR C13 - Vehicular HF SR C42 - Vehicular VHF SR C50 - Transportable VHF radio relay SR C70 - Transportable UHF radio relay SR D70 - a failed attempt as long range SHF radio relay - they forgot the Fresnel clearance. T D11 - (Transmitter only) Vehicle/static medium power (350W on CW, 100W DSB) R 230 - Receiver (these were numbered consecutively in order of development) T E10 - HF Transmitter (58 - 78 kVA input for 2 -> 30 kW output, mind your fingers!) Chris |
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