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| This QG transmitter, which appears in the book "Handbook of Technical Instruction For Telegraphists" has a few more parts than the colour photo below. |
Description: The QG is a quenched gap spark transmitter which contains eight, plated spark gaps and four flat copper strap inductance coils with variable taps. The ammeter at the lower right is of the half moon variety and whose scale reads 0 - 15 AMPS.Power level: 1,500 watts
Frequency range: 220 to 800 metres. Designed to quickly select 450, or 600 or 800 metre wavelengths. This is accomplished with the three-way, quick changeover switch.Input power to motor alternator: 110 VDC from ships mains.
Alternator output power to transmitter input : 200 volts at 500 Hz
Made by : Marconi UK
Comment: The Quenched gap transmitter was first developed by the Telefunken Compamy in Germany.
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| This QG transmitter, which appears in the book "Handbook of Technical Instruction For Telegraphists" has a few more parts than the colour photo below. |
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| QG transmitter. The transmitter's nameplate has the following markings: MARCONI WIRELESS TELEGRAPH CO LTD. LONDON Marconi Transmitter Type No. QG PC No. 1434 E-INST 356546 (Photo courtesy History of Science Museum) |
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| This is the basic QG circuit showing the gap, the quick band change switch and the antenna ammeter. The capacitor 'C' is .01 uf and rated at 8,000 volts. (Courtesy Handbook of Technical Instruction For Telegraphists) . |
Contributors and Credits:1) Lewis Bodkin <05bodkin555(at)gmail.com>
2) Handbook of Technical Instruction for Telegraphists
Jul 8/19