The three band S-710/B receiver (All World Six), general coverage.
VLF RECEIVER REVIEW PLUS
The BFO had a range of plus or minus 3 kc/s. The intermediate frequency was permeability tuned to 450kc/s, the coupling between the coils being varied mechanically by a panelĬontrol to give a wide range of selectivity. Has been sold as Marconi "Elettra" (MIMCO 3873A).įrequency Coverage :- 480 kc/s to 30 Mc/s in 5 ranges. A variant with high power 10W audio output Successor model 670C/1, sold under Marconi "Elettra" label (MIMCO 2232B). Receiver used as "cabin set" on board of ships for first class passengers and ship's officers Ĭoverage 150 kHz - 30 MHz in six bands (150-350kHz 500-1110kHz 1,11-2,5MHz 2,5-5,5MHz 5,5-13MHz 13-30 MHz), AM only. The later vesion, the six band S-670C receiver, general coverage. The designation "Marine Receiver 659/670" in the same place of the magic eye. Receiver used as "cabin set" on board of shipsįor first class passengers and ship's officers Coverage 522 kHz - 30 MHz in four bands (522-1220 kHz 1,2-2,75 MHz ģ,7-10,6 MHz 10,5-30 MHz, not the gap in the range of maritime communications bands), AM only.In many sets, spareĭials made for the 659 receiver have been used (mediumwaves marked in meters), the dial back-plate carried The four band S-670 receiver, general coverage. Dial later used for much more common 670. Usually supplied with huge console speaker. In four bands (522-1220 kHz, 1,2-2,75 MHz, 5,8-13 MHz, 12,8-30 MHz), AM, magic eye tuning indicator, noise limiter (switch on rear of set). Communications receiver covering 520 kHz - 30 MHz The Tea Planters special, the 659, with matching speaker Separate speaker, 669 S-meter and 687 6V accumulator. Shortwave receiver covering 1,7-32 MHz in three bands (1,7-4,5 MHz, 4,5-12,6 MHz, 12,6-32 MHz), AM, CW (BFO) optional The three band S-640 receiver, general coverage. Similar to 504 but with two integrated speakers and magic eye tuning indicator. S-Meter tuning indicator, Noise limiter, Crystal filter. Army tube designations: ARP34 ARTH2 ARP34 ARP34ĪR21 ARP34 VT52 ZA3489. Matching external Power supply S390 supplying 6V LT and 175/180V HT. No crystal filter, note the lacking switch left of "tone" and "BFO" controls (see 358X with crystal filter). Wave band is changed by plugging in different coil units. The "All Wave Four", hinged lid, smaller (1 1/2") plug-in coils covering 140 kHz - 30 MHz.Ĭoverage 40 kHz - 31MHz in 10 bands. Tropicalised diecast cabinet similar to that of Tropicalised diecast sectionalised aluminium case with hinged cover.Įddystones' earliest "professional grade" model successfully used by British Arctic Air Route Expedition 1930.ġ934, TRF, AM, 140 kHz - 30 MHz with plugin coils. Igranic Indigraph dials, aerial tuning coupling condensor TRF with reaction (regenerative).Ĭoverage 150 kHz - 24 MHz (2,5" vertical plug in coils: blue coil 13-26m, yellow 22-45m, red 40-85 m,green 250-500m), (V.I.s were civilian hams and S.W.L.s who monitored enemy Morse signals from their home QTH for Bletchley Park cipher school to decode.)Īn early set here, 1932 ish. Used by Voluntary Interceptors (V.I.s) during the early war period, before H.R.O.s were bought from U.S.A. A mains hybrid was described (heater transformer, HT battery) but never mentioned again. (The starting pay for an office boy at this time was around 5s weekly).Īll World Two 1936-39. To tempt new impecunious S.W.L.s it was offered on Hire Purchase terms complete with phonesĪnd batteries for £1 down and six monthly payments of 16s 4d.
It continued in the shops until the outbreak of World War 2, by which time its price (ready-built) £3 7s 6d plus valves and case) or ready-built and tested for £5 5s complete. Probably the ‘Cinderella’ of Stratton in the late ‘30s, the A.W.2 is described in E.S.W.M. 15-52 metres with the two coils supplied (others extra).
VLF RECEIVER REVIEW SERIAL NUMBER
(The 730 itself is unique in that its a 730, serial number 00001)ĪLL WORLD TWO: 1936. The S.700 or IMR54 receiver, as used on the Queen Mary liner, with a 'normal sized' 730 sitting on top. The Eddystone wall, the display in the museumĪnd now, in greater detail with brief descriptions Ben Nock, Military Wireless Museum Military Wireless Museum