535

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.

Lineage & Background of the Five Argonauts

Reviews

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 @ 25^oC.
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.