Navy Receiver SE-1420 Type B (IP-501)

Amrad Corporation; Medford Hillside (MA)

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  • Year
  • 1919
  • Category
  • Military Receiver
  • Radiomuseum.org ID
  • 187557
    • alternative name: American Radio & Research

 Technical Specifications

  • Number of Tubes
  • 1
  • Main principle
  • TRF with regeneration
  • Tuned circuits
  • 3 AM circuit(s)
  • Wave bands
  • Broadcast (MW) and Long Wave.
  • Power type and voltage
  • Storage and/or dry batteries
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Wooden case
  • from Radiomuseum.org
  • Model: Navy Receiver SE-1420 Type B - Amrad Corporation; Medford
  • Shape
  • Tablemodel, Box - most often with Lid (NOT slant panel).
  • Dimensions (WHD)
  • 20 x 11 x 9 inch / 508 x 279 x 229 mm
  • Notes
  • Uses a crystal detector or 1 tube. See also Wireless Specialty, IP-501. The SE-1420 was designed for the Navy at the close of WWI by Louis Hazeltine, who was a Stevens Institute graduate and later taught there. Hazeltine, in addition to teaching at Stevens Institute, was also a consultant to the Washington Navy Shipyard. A former student of Hazeltine's, L.C.F. Horle, was the technical leader at the Washington Navy Shipyard and the laboratory there was responsible for radio receiver design. Horle engaged Hazeltine to design a new wireless receiver for military use. What the Navy wanted was a receiver that could operate in the presence of nearby spark transmitters without interference and would allow stable operation while the detector was oscillating for reception of arc transmitters. Hazeltine first utilized a three-circuit tuner, that is, adjustable tuning of the antenna circuit, the detector grid circuit and the detector plate circuit, to provide excellent sensitivity. He then used a completely shielded cabinet and isolated the Antenna Tuner circuit from the Secondary Tuner circuit with another shielded panel. This complete shielding would eliminate any stray pick up, hand-capacity effects or any coupling between the two circuits. Using a sharply tuned Antenna Tuner helped to improve selectivity and reduce adjacent frequency interference. By using a small Coupling Coil mounted inside the Antenna Coil and only allowing the energy from the Coupling Coil into the Secondary Tuner, further reduction of unwanted signals was realized. The two main inductors used bank-wound Litzendraht wire coils to reduce capacitive losses. "Dead turns" on all switched inductances were grounded by the action of the switches to further reduce losses. All of these efforts increased the selective nature of the SE-1420's tuning ahead of the detector input. The regeneration, called "TICKLER," was provided by a variometer that was built into the secondary inductor form. The TICKLER controlled the sensitivity and somewhat the selectivity of the receiver. The TICKLER also would allow the detector to be operated as an Autodyne or oscillating regenerative detector. Since the detector was oscillating at the tuned frequency this provided a heterodyne action with the incoming signal that the allowed demodulation of an arc transmitter's continuous wave (CW) signal. When operated as an autodyne, the receiver requires complete shielding to eliminate hand-capacity effects and stout construction for stability.
  • Price in first year of sale
  • 550.00 $

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