====== Delta II Model 536 ======
{{536.jpg?150|}}

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

===== Reviews =====
  *[[http://www.arrl.org/members-only/prodrev/pdf/pr9201.pdf|ARRL]] (Must be ARRL member and logged in to view.)
  *[[http://www.eham.net/reviews/detail/718|eHam]]



===== Mods & Tips =====
  *[[536addr|Computer Control / Setting the Receiver Address Code]]
  *[[536backlight|Display Backlight]]

===== 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 [[700]]C
  *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<sup>o</sup>C.
  ***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.