Radio Blinker Receiving Set Three-In-One

The Perry Radio Blinker Receiving Set Three-In-One combines three functions into one model:

1. Wireless Receiving Set (crystal receiver)
   • 375-2000 kHz range (150-800 m)
   • dust-proof crystal detector, extremely sensitive
   • tuning coil with multiple taps
2. Miniature Sending Set (morse code transmitter)
   • transmission range within the limits of the buzzer gap RF-radiation
3. Practice Set for Code Work
   • key and buzzer

Connections for aerial, ground, and headphones.

The receiver is the same as the Perry Radio Blinker Receiving Set.

The Miniature Sending Set uses a key, buzzer, and internal Eveready 3V battery. The RF code transmission relies on the arcing of the buzzer contact gap to generate a very low-power, wideband RF static signal that may be picked up by the antenna wire and crystal receiver, or perhaps by another nearby crystal receiver. With two Three-In-One units it is possible to practice bidirectional code between them, subject to the limited buzzer RF transmission range.

When one Three-In-One unit is used, the operator listens to their own code signals.

There were three initial purchase options:

• Basic unit: $12
• Equipment No. 1 : $25
  • Basic unit and a pair of Western Electric Co. Headphones of best quality
• Equipment No. 2 : $25
  • Basic unit and 2 pairs of Murdock 3000 ohm Headphones

By 1925, Perry was advertising the basic unit for $6.

In questo link sono elencati 7 modelli, di cui 7 con immagini e 1 con schemi.
Elenco delle radio e altri apparecchi della Perry & Sons, Frank B.; Providence (RI)