Ten Tec Argonaut Model 509, Ham Radio acc. For Sale

Ten Tec Argonaut Model 509, Ham Radio acc.
Current Bid: $ 224.50  

Specifications: Receiver Sensitivity: less than 0.5 uv for 10 db signal-plus-noise ratio Selectivity: 2.4 kHz at 6 db down; 1.7:1 shape factor at 6/50 db Input: low impedence unbalanced coaxial input Output Impedence: 8 ohm speaker or headphone (high or low impedence headphones can be used) Power Ouput: 1 watt at 8 ohms with less than 2% distortion 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 watss PEP; 5 watts CW RF Power Output: 2 watts (50 ohm non-rative load), minimum Output Impedence: 50 to 75 ohms Transmit-Receive Operation: SSB: PTTCW: complete break-in CW Sidetone: internally switched; operates only in CW mode Microphone Input: high impedence; 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 MHz7.0 to 7.5 MHz14.0 to 14.5 MHz21.0 to 21.5 MHz28.0 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: +/- 5kHz on 80 through 15 meters; +/- 10kHz 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, auxillary 12v output jack, key jack, power in jack, receive/transmit antenna switch, accessories socket Semiconductor Devices: 32 transistors, 3 MOSFETS, 3 I.C. and 18 Diodes Power Requirements: 13-14 VDC regulated to 10% with 1 ampere load Cabinet Dimensions: HWD 4-1/2" x 13" x 7-1/2" Material: case: aluminumside panels: cycolac Net Weight: 6 pounds Shipping Weight: 8 pounds

The Argonaut 509 was the second in the fabled Ten-Tec Argonaut series of low-power transceivers. The transceiver provides for SSB and CW operation on the 80, 40, 20, 15, and 10 meter bands with power output of about two watts. It might be argued that this rig and its immediate predecessor, the Argonaut 505, convinced the ham radio world that not only was QRP operation possible, it was fun. The Argonaut 509 originally sold for $329 and was introduced about 1973.

The Argonaut 509 was a well-designed but bare-bones CW/SSB rig. Enhancements were offered by Ten-Tec in the form of external units. These included the Model 206 100kHz Pulsed Crystal Calibrator, the Model 208 CW Filter, the Model 210 Power Supply, the Model 215P Ceramic Microphone, and the Model KR5-A Keyer. For times when a bit more power was needed, the Model 405 Linear Amplifier provided 50 watts with three watts input. As an indication of the care that the designers put into the design of this rig, the Model 208 CW filter, an external, four stage, 400Hz and 150Hz audio filter, was kept inside the AGC loop and the CW sidetone doesn't pass through the filter

.Ten Tec Argonaut Model 509 

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