• Country
• United States of America (USA)

• Manufacturer / Brand
• Hallicrafters, The; Chicago, IL and Arlington/Grand Prairie, TX

• Year
• 1938

• Category
• Commercial Receiver (may include amateur bands)

• Radiomuseum.org ID
• 18698

Click on the schematic thumbnail to request the schematic as a free document.

• Number of Tubes
• 9

• Valves / Tubes
• 6K7 6J5 6J7 6L7 6K7 6K7 6Q7 6F6 80

• Main principle
• Superhet with RF-stage; ZF/IF 465 kHz

• Tuned circuits
• 11 AM circuit(s)

• Wave bands
• Broadcast, Short Wave(s) and Police.

• Power type and voltage
• Alternating Current supply (AC) / 110-120 Volt

• Loudspeaker
• - For headphones or amp.

• Power out
• 3.5 W (unknown quality)

• Material
• Metal case

• from Radiomuseum.org
• Model: Sky Challenger II SX-18 - Hallicrafters, The; Chicago,

• Shape
• Boatanchor (heavy military or commercial set >20 kg).

• Dimensions (WHD)
• 21 x 9.6 x 11 inch / 533 x 244 x 279 mm

• Notes
• Coverage: 0.545-1.23, 1.18-2.85, 2.75-6.82, 6.75-16.40, 15.40-38.10MHz, XTal-IF-Filter, Recessed Main Dial, Infinite image rejection Circuit on Bands 4&5, Socket on rear apron for optional "S" Meter

• Price in first year of sale
• 89.00 $

• External source of data
• E. Erb 3-907007-36-0

• Source of data
• Communications Receivers

• Circuit diagram reference
• Rider's Perpetual, Volume 13 = 1942 and before

• Mentioned in
• Radio Shack Catalog (1939, page 05)

• Other Models

• Here you find 926 models, 476 with images and 526 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Hallicrafters, The; Chicago, IL and Arlington/Grand Prairie, TX