• Country
• United States of America (USA)

• Manufacturer / Brand
• Heathkit (Brand), Heath Co.; Benton Harbor (MI)

• Year
• 1953–1956

• Category
• Amateur Transmitter (only)

• Radiomuseum.org ID
• 80757

• • alternative name: Heath Company

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

• Number of Tubes
• 3

• Valves / Tubes
• 6AG7 6L6 5U4G

• Wave bands
• Wave Bands given in the notes.

• Power type and voltage
• Alternating Current supply (AC) / 110-125 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Amateur-Transmitter AT-1 - Heathkit Brand, Heath Co.;

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 13 x 8.5 x 7 inch / 330 x 216 x 178 mm

• Notes

• Heathkit Amateur-Transmitter AT-1.
  Xtal-controlled CW TX for the 80-, 40-, 20- and 10-m-HAM-bands.

  Crystal-controlled amateur band transmitter kit.  The bands covered are switched as 80, 40, 20 and 10/11.  The 15 meter band is also covered by way of the 10/11 switch position as described in the manual which has a chart of the recommended crystals for each band.  Power (input) was variously advertised as 35 watts or 30 watts, or as 25-30 watts as described in the manual.  All of the bands rely on doubling with the exception of the 80 meter band which is straight-through.  The 80 meter band does not tune the oscillator plate, limiting output power on 80 meters.  Oscillator tuning is switched in for the other bands.  Sockets are available for connecting a modulator (never sold by Heathkit) or a VFO (for the Heathkit VF-1)

  The first AT-1 ad in Radio and Television News appears in the May 1953 issue.  Lewis McCoy wrote a review article in the October 1955 QST magazine with steps to improve the AT-1 output power by avoiding the need for doubling in the final and also tuning the oscillator plate for the 80 meter band. 

   

• Net weight (2.2 lb = 1 kg)
• 6.6 kg / 14 lb 8.6 oz (14.537 lb)

• Price in first year of sale
• 30.00 USD

• Source of data
• Heathkit: A Guide to Amateur Radio Products

• Mentioned in
• -- Schematic

• Literature/Schematics (1)
• -- Original-techn. papers. ("The Novice MOPA - Heathkit AT-1" by R Post in the Aug 2023 issue of The Spectrum Monitor p. 69-74)

• Author
• Model page created by Bernd Pötzsch. See "Data change" for further contributors.

• Other Models

• Here you find 713 models, 697 with images and 503 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Heathkit (Brand), Heath Co.; Benton Harbor (MI)