Box set of bulbs and fuses for Vintage Military Radio C11/R210

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Object description Larkspur spare fuses and bulbs in greenpainted case with webbing buckled strap. Stores reference Z2/5820-99 containing:- 30 x assorted fuses 16 x Bulbs Wording on top of box Z2/5820-99 Case maintenance Kit Electronic Equipment Steel 1 ¾ in x 4 ¼ in x 7 ¼ in O/A Shaped Rubber Insert Fitted Parts for Wireless Equipment, Larkspur Transmitter-Receiver Type C11/R210 and Ancillary, British Alternative Names Radio Ancillary Equipment, Bulb, Transmitter-Receiver Type C11/R210, Larkspur Wireless Set, British Catalog number COM 1786.43 From Wikipedia, the free encyclopedia Larkspur radio system Larkspur was the retrospectively adopted name of a tactical radio system used by the British Army . Its development started in the late 1940s with the first equipments being issued in the mid-1950s. It remained in service until replaced by Clansman in the late-1970s although some elements of Larkspur were still in service well into the 1980s. It was widely exported to British Commonwealth armies and other friendly nations. The origin of Larkspur was a post-war project to move tactical short-range radio communications in the forward battle area from HF using amplitude modulation to low-band VHF using frequency modulation . This followed the similar move by the US Army in the latter part of WWII which had demonstrated significant advantages. Where the use of VHF was not practical, HF sets using narrow band phase modulation (NBPhM) were developed as the only practical method at the time of obtaining some performance improvement over the use of AM especially at night. The range of sets originally comprised the vehicle VHF sets C42, C45, B45, B47, B48 and the C13 vehicle HF transceiver, all of which were designed to specifications produced by the government Signals Research and Development Establishment (SRDE) at Christchurch and initially designated as the "New Range" to differentiate them from wartime legacy radios. They were characterized by similar appearance, tuning drills, frequency indication using film strip displays, the use of relatively simple architecture that avoided complex switching as far as possible and using commonly available components and a degree of modularity in construction. Plessey Mk.IV connectors were used extensively in the sets and accessories. An important operational advance was that the sets incorporated internal calibration facilities which meant that they could be accurately pre-set on a frequency without radiating any signal. This enabled all stations in a net to be confidently pre-tuned on the same channel and eliminated the old compromising "Tuning and Netting Call" system that advertised the presence of activity to an enemy. All the sets were constructed in strong hermetically sealed alloy enclosures - a measure that had been found to be essential to ensure durability and reliability during the previous war, and were sized to fit a standardized range of vehicle mountings. A range of control and distribution accessories known as a harness to enable radio facilities to be accessed from various points in a vehicle was also produced. Initially, roll-out of the VHF New Range sets was restricted to the Royal Armoured Corps and the Royal Artillery , reflecting the fact that these formed the "teeth" elements likely to be involved in meeting any perceived threat of a Soviet advance across northern Europe. In 1962 a project to re-equip the remainder of the army was undertaken and given the name Larkspur , the name officially becoming retrospectively applied to the original New Range sets and eventually by common use becoming a technically incorrect generic label for virtually any radio equipment used by the British Army between the end of WWII and the arrival of the Clansman Combat Net Radio family. The HF set of the family, the C13 was included for use as a short-range combat net radio in circumstances where VHF was unsuitable and could also be used (us... read more

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