536

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. Delta II Model 536 is the 100 watt version of the Argonaut II Model 535.

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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
Power Supply Model 936
Fan Kit Model 303
Circuit Breaker Model 1140

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 1.0 A, Transmit - approximately 20 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 14" (9.53 x 24.77 x 35.56 cm)
Net Weight: 12 lbs, 7 oz (5.54 kg)

Transmitter

Modes: USB, LSB, CW, RTTY (AFSK), and FM.
RF Power Output: Zero to 100 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.