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Argonaut Model 509

Description

  • Five bands, 3.5 - 30 MHz
  • SSB & CW modes
  • Fully solid state
  • Permeability tuning
  • Instant break-in
  • Instant band change
  • Built-in SWR bridge
  • S-Meter
  • WWV
  • Internal speaker
  • Direct frequency readout
  • Receiver offset tuning
  • Five watts input
  • Automatic sideband selection
  • Plug-in circuit boards
  • 1/2 uV receiver sensitivity
  • 12 - 14 VDC or AC pack power
  • Size: HWD 4.5" x 13" x 7"
  • Weight: 6 lbs

Video of 509 with Internal Digital Readout

Mods & Tips

Accessories

  • Antenna Tuner Model 205
  • 100 kHz Crystal Calibrator Model 206
  • CW Filter Model 208
  • One Ampere Power Supply Model 210
  • Ceramic Microphone Model 215P
  • Keyer Model KR5A

Lineage & Background of the Five Argonauts

Specifications

Receiver

  • Sensitivity: Less than 0.5 uV for 10 db signal-plus-noise-to noise ratio.
  • Selectivity: 2.4 kHz at 6 db down. 1.7:1 shape factor 6/50 db.
  • Input: Low impedance unbalanced coaxial input.
  • Output Impedance: 8 ohm speaker or headphones. (High or low impedance headphones can be used.)
  • Spurious Response: More than 50 db down.
  • Automatic Gain Control: (Max) For 100 db change in input signal level, output changes less than 6 db.
  • Offset Tuning: With pull-out defeat switch.

Transmitter

  • DC Power Input: 5 watts PEP; 5 watts CW.
  • RF Power Output: 2 watts (50 ohm non-reactive load), miniumu.
  • Output Impedance: 50 to 75 ohms.
  • Transmit-Receive Operation: SSB: PTT. CW: Complete break-in.
  • CW Sidetone: Internally switched. Operates in CW mode.
  • Microphone Input: High impedance. Crystal, ceramic, or dynamic.
  • Carrier Suppression: 40 db from single tone output.
  • Sideband Suppression: 30 db down from a single tone output at 1000 Hz reference.

General

  • Frequency Coverage: 3.5 to 4.0, 7.0 to 7.5, 14.0 to 14.5, 21.0 to 21.5, 28.0 to 30.0 MHz.
  • Frequency Stability: Less than 100 Hz change from 10.5 to 14 VDC.
  • Modes of Operation: Normal sideband, reverse sideband, CW.
  • Dial Calibration: +/- 5 kHz on 80 through 15 meters, +/- 10 kHz on 10 meters.
  • Tuning Rate: Approximately 25 kHz per knob revolution, 80 meters through 15 meters. 100 kHz on 10 meters.
  • Front Panel Controls: Resonate. Offset (pull-off). Band Selector. Tuning Knob. RF Gain. AF Gain/Power On-Off. Mode Switch. Meter Switch. Drive.
  • Rear Apron Connectors: Antenna. Dial light switch. Microphone jack. Headphone/speaker jack. Receiver antenna. Auxilliary 12 V output jack. Key jack. Power in jack. Receive/Transmit antenna switch. Accessories socket.
  • Semiconductor Devices: 32 Transistors, 3 Mosfets, 3 I.C.'s, and 18 Diodes.

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