Wireless Set No. 19 Overview and Historical Context

The Wireless Set No. 19 was a crucial communication tool used by the British Army during World War II.

Developed by the British General Post Office, it was a wireless set designed for use by infantry units in the field.

The set was first introduced in 1940 and quickly became a standard issue item for British soldiers.

It weighed just over 18 pounds, making it portable and easy to carry.

The Wireless Set No. 19 was a significant improvement over earlier wireless sets, providing better range and reliability in the field.

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The Wireless Set No. 19 was a rugged radio communications transceiver designed for use in the field.

It had a frequency range of 2-8 MHz for the 'A' setting and 229-241 MHz for the 'B' setting, controlled by a Master Oscillator.

The set supported multiple modes, including AM voice, MCW, CW, and VHF inter-tank communications.

A key feature of the Wireless Set No. 19 was its crew intercom system, allowing for clear communication within the vehicle.

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The set's dimensions varied depending on the configuration, but the sender/receiver unit was typically 17.5 inches wide, 8.25 inches high, and 12.25 inches deep.

The weight of the Wireless Set No. 19 was also dependent on the configuration, ranging from 40.5 pounds for the sender/receiver unit to 88.25 pounds for the complete Mk III setup.

Here's a summary of the Wireless Set No. 19's specifications:

The Wireless Set No. 19 has several components that are essential for its operation.

The B set receiver is based around a super-regenerative detector. This type of detector is not widely used these days, but for the VHF channels used, this was an ideal way of producing a very high gain radio with a minimum of circuitry.

The B set receiver has four valves, namely an RF amplifier, a quench frequency oscillator, an audio amplifier, and an audio output valve.

Here is a breakdown of the valve line-up for the B set receiver:

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The WS 19 circuit is a single conversion superheterodyne format, which means it converts the signal down to a lower frequency before demodulating and applying it to the audio stage.

The receiver uses a 6K7G variable mu pentode for the RF signal amplifier, specifically valve V1A.

The local oscillator and frequency changer (mixer) is handled by valve V2A, which also includes a triode section for generating the local oscillator signal.

The tuned output from the RF stage is then passed to the mixer, which uses part of valve V2A.

The anode of the mixer stage has a coupling tuned IF transformer tuned to the 465kc/s frequency.

The local oscillator signal is generated by the triode section of V2A and the tuning capacitor is ganged with those of the RF stages for correct tracking.

The tuning is in two bands: 2 Mc/s to 4½ Mc/s and then 4 ½ Mc/s to 8 Mc/s, which requires switching all the tuning coils for both the RF stages and the local oscillator.

Here is a summary of the valve lineup for the receiver:

The WS 19 sender is a crucial component of the Wireless Set No. 19, and its design is quite interesting. It shares many circuits and valves with the receiver to reduce circuitry and ensure that the transmit and receive frequencies are the same.

The A set sender uses several elements common to the receiver, including the receiver oscillator and heterodyne oscillator. These elements are mixed within valve V2B for CW to reconstitute the exact frequency for transmission.

The transmitter in the A set uses a tuned buffer stage based around V5A, the ARP35 or EF50, to ensure the correct mix output for the signal is selected. This is applied to the grid of the power amplifier stage based around V4A, an 807.

Bias for the PA is obtained from V6A and keeps the PA stage operating within its required range. The output from the power amplifier has a low output impedance, allowing it to be coupled to the aerial variometer using a low impedance coaxial line.

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The WS 19 B set sender, on the other hand, is relatively straightforward and uses only three valves: V1E, V8E, and V7A. These valves are used for the audio amplifier, audio amplifier and modulator, and master oscillator and output, respectively.

Here's a breakdown of the valve lineup for the B set sender:

The B set sender's design is simple and effective, making it a great choice for short-range transmission.

The WS 19 B set receiver is an interesting piece of equipment. It's based around a super-regenerative detector, a type of detector that's not widely used these days.

This type of detector was ideal for the VHF channels used, as it allowed for a very high gain radio with a minimum of circuitry. The WS 19 B set receiver has four valves in total.

The valves are used for various purposes within the circuit. Here's a breakdown of the valves used in the WS 19 B set receiver:

The RF amplifier serves to isolate the super-regenerative detector oscillations from reaching the antenna and being radiated. It also provides RF gain.

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The microphone used with Wireless Set No. 19 was a headset and microphone, or a headset and tannoy microphone, both of which were used from 1942 to 1946.

These microphones were designed for use with Wireless Set No. 19, a British wireless communication system. The headset and microphone, as well as the headset and tannoy microphone, were made by unknown makers, but were all British in origin.

The headset and microphone, and the headset and tannoy microphone, were used for communication purposes, likely for military use given the time period. These microphones were an essential component of Wireless Set No. 19, allowing users to communicate with others over long distances.

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The installation process for Wireless Set No. 19 is relatively straightforward. It requires a power source, typically a battery or an external power unit, which is connected to the set's power input.

The set's power input is a 28-volt DC connector, as specified in the technical manual. The power source should be chosen based on the set's power requirements.

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The antenna for Wireless Set No. 19 is a whip antenna, which is designed to provide a high-gain signal. It is typically mounted on the set's housing or on a separate antenna mount.

The set's accessories include a headset, a microphone, and a power cord. The headset is designed for hands-free operation, while the microphone is used for voice communication.

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The Wireless Set No. 19 has a comprehensive set of visuals and documentation to help with understanding and maintenance. The set includes detailed block diagrams, schematics, and photos to illustrate its components and functionality.

You can find a block diagram of the sender/receiver, which shows the relationship between different parts of the system. This diagram is useful for understanding how the various components interact with each other.

The complete schematic of the sender/receiver is broken down into two parts, A and B sets, making it easier to follow and understand the complex wiring and electronics involved. This level of detail is essential for troubleshooting and repairing the set.

A variometer schematic is also included, which is a critical component of the system. The variometer is responsible for measuring changes in altitude and air pressure.

The supply unit schematic is another crucial document that provides insight into the power and electrical systems of the Wireless Set No. 19. This is essential for ensuring the set is properly powered and functioning correctly.

You can also view the front and inside of the sender/receiver, as well as the front view of the set and supply unit, which can be helpful for identifying any physical issues or damage. Additionally, there are photos of the set and supply unit with a guard and waterproof cover, which is an important feature for protecting the equipment in harsh environments.

The Wireless Set No. 19 was in use from 1942 to 1946. This period saw the Mk III variant being used, alongside the Supply Unit No. 1 and a base plate, all made by an unknown manufacturer in Britain.

During this time, the Wireless Set No. 19 Mk III was a crucial piece of equipment. Its use continued until 1946, marking the end of its operational period.

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