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Argonaut II Model 535

Description

Microprocessor controlled HF transceiver. Synthesized PLL design provides general coverage from 100 kHz to 29.999 MHz. Features backlit LCD display, dual digital VFO's, tunable I-F filter system, 48 nonvolatile RAM memories, memory tune, 24 hours clock, and "no-tune" final power amplifier. Argonaut II Model 535 is the QRP version of the Delta II Model 536.

Reviews

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Manual

Mods & Tips

Accessories

  • Antenna Tuner Model 291
  • Mobile Mount Model 293
  • RS-232 Serial Level Converter Model 305
  • Plug adapter, 4-pin power supplies to 2-pin Model 306
  • Low Current Curtis Chip Keyer Model 606
  • Hand Microphone Model 700C
  • Desk Microphone Model 705
  • Step Attenuator Model 290
  • Power Supply Model 935

Specifications

General

  • Frequency Range: Receive: 100 kHz to 29.999 MHz, Transmit: 1.8 to 29.999 MHz
  • Frequency Control: Microprocessor controlled digital PLL synthesizer. 10 Hz resolution.
  • Frequency Readout: 7 digit 10 Hz backlit LCD readout. Also displays time, RXO, memories, modes, and S-meter.
  • Frequency Stability: Worst case, 1 PPM per degree C at 29.999 MHz.
  • Frequency Accuracy: +/- 100 Hz @ 25oC.
  • Memories: 48 total memory channels, 32 simplex, 16 duplex.
  • Antenna Impedance: 50 ohms unbalanced.
  • Power Required: Receive - approximately 0.75 A, Transmit - approximately 3 A @ 13.8 VDC
  • Construction: Rigid aluminum chassis. Molded ABS Cycolac front panel. Textured top and bottom, snap up stainless steel bail, carrying handle. Printed circuit boards G-10 epoxy glass.
  • Dimensions: HWD 3.75" x 9.75" x 12.5" (9.53 x 24.77 x 31.75 cm)
  • Net Weight: 8 lbs, 10 oz (3.91 kg)

Transmitter

  • Modes: USB, LSB, CW, RTTY (AFSK), and FM.
  • RF Power Output: Zero to 5 watts adjustable with front panel PWR control.
  • Microphone Input: Four pin front panel connector accepts microphones wth 50K ohms or less and with 5 mV (-62dB) output. Polarizing voltage is available for electret types.
  • T/R Switching: VOX or PTT.
  • CW Sidetone: Internally generated, volume is adjustable from keypad and is independent of AF gain control.
  • SSB Generation: Double sideband modulator. 8 pole crystal ladder filter.
  • Carrier Suppression: 50 dB or more typical.
  • Unwanted Sideband Suppression: 45 dB typical at 1.5 kHz tone.
  • Spurious Output: More than 45 dB below peak power output.
  • Meter: Switchable forward power (FWD), SWR, S-meter.
  • CW Offset: 700 Hz factory preset.

Receiver

  • Modes: USB, LSB, AFSK, AM, FM.
  • Sensitivity:
Mode Frequency, MHz
0.1 - 1.6 1.6 - 29.999.99
SSB, CW, AFSK 0.50 uV 0.25 uV 10 dB S/N @ 2.5 kHz
AM 3.5 uV 1.00 uV 10 dB S/N @ 6.0 kHz
FM 1.00 uV 0.30 uV 12 dB SINAD @ 15 kHz
  • Selectivity:
Mode Selectivity Shape Factor
-6 dB -60 dB
SSB (BW @ Max) 2.5 kHz 4.9 kHz 2.0:1
AM 5.1 kHz 15.8 kHz 3.1:1
FM 15.0 kHz 30 kHz @ -30 dB 2.0:1
  • Crystal Filter: 8 pole ladder type, "Jones" Filter (Patent #5051711). Bandwidth continuously adjustable from 2.5 kHz to 500 Hz.
  • Attenuator: Approx. -20 dB for 0.1 to 29.999 Mhz.
  • I-F Frequencies: 1st - 45 MHz, 2nd - 6.144 MHz, (FM 3rd - 455 kHz).
  • Image Rejection: > 80 dB.
  • I-F Rejection: >70 dB.
  • Noise Blanker: Switchable on/off.
  • S-Meter: Automatically switched on during receive. Calibrated to 50 uV at S9 with attenuator off.
  • Dynamic Range: 95 dB typical.
  • Noise Floor: -129 dBm. (0.25 uV for +10dB S/N in ssb).
  • Squelch Sensitivity: FM - Less than 0.6 uV.
  • Pass Band Tuning: +/- 2.5 kHz, digitally controlled.
  • Audio Output: 1.5 watts @ 4 ohms with less than 2% distortion.
  • Notch Filter: 250 to 2.2 kHz, 50 dB notch typical.
  • BFO: Digitally controlled PLL.
  • Receiver Offset: +/- 1.27 kHz (+/- 2.54 kHz when FAST is enabled) digitally controlled with RXO control, unlimited with second VFO.

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