====== Triton IV Model 540 ======
{{540.jpg?150}}

===== Description =====
Solid state transceiver covering 3.5 to 30 Mhz with 200 watts //input// on all bands.

===== Accessories =====
  *Digital Readout Model [[244]]
  *One-Sixty Converter Model [[240]]
  *Remote VFO Model [[242]]
  *Crystal Oscillator Model [[241]]
  *Microphone & Stand Model [[215]]P
  *AC Power Supply Model [[262M]]
  *AC Power Supply Model [[252M]]
  *Antenna Tuner Model [[247]]
  *Noise Blanker Model [[249]]
  *CW Filter Model [[245]]
  *Additional Crystals Models [[212]] and [[213]]
  *Mobile Circuit Breaker Model [[1140]]

===== Reviews =====
  *[[http://www.eham.net/reviews/detail/736|eHam]]





===== Mods & Tips =====
  *[[544keyloop|Add QSK Amp Loop Mod]]
  *[[tritonpwr|Triton Power Connector]]
  *{{triton_iv_service_note_sn-1-540.pdf|Triton VI Service Note SN-1-540}} - Using Accessories with the Triton IV
  *[[http://p1k.arrl.org/pubs_archive/74970|Add A Crystal Filter To Your Ten-Tec 540!]] (QST Archive - Must be an ARRL member to access.)

===== Sales Information =====

  *{{540_544brochure.pdf|Triton IV Sales Brochure}} (1.2 MB)


===== Specifications =====

==== General ====
  ***Frequency Bands:** 3.5 - 4.0, 7.0 - 7.5, 14.0 - 14.5, 21.0 - 21.5, 28.0 - 28.5, 28.5 - 29.0, 29.0 - 29.5, 29.5 - 30.0 MHz.  Ten meter crystals furnished  for 28.0 - 29.0 MHz.
  ***All circuits permeability tuned.**
  ***Tuning Rate:** Tuning vernier 25 kHz per revolution, typical.
  ***Direct frequency readout:** Slide rule, color coded dial indicates 100 kHz segment, dial skirt increment to 1 kHz.  Accuracy +/- 1 kHz from nearest 25 kHz calibration point.
  ***Calibrator:** 25 Khz pulsed calibrator
  ***Automatic sideband selection, reversible**
  ***VFO Frequency Stability:** Less than 15 Hz change per F<sup>o</sup>, averaged over a 40<sup>o</sup> change from 70<sup>o</sup> to 110<sup>o</sup>, after 30 minute warmup.  Less than 10 Hz change from 105 to 125 VAC line voltage when using TEN-TEC power supply.
  ***Power Required:** 12-14 VDC, 500 mA receive, 18 A maximum transmit.
  ***Modular Contruction:** 10 plug-in assemblies and 7 fixed circuit boards.
  ***Semiconductors:** 47 transistors, 33 diodes, 11 IC's
  ***Power switch remotely controls power supply.**
  ***Snap-up front feet.**
  ***Contruction:** Rigid aluminum chassis, sub-panels, top and bottom. Cycolac plastic side panels.
  ***Finish:** Etched aluminum panel, textured black top and sides
  ***Dimensions:** HWD 4.5" x 13.625" x 13"
  ***Weight:** 12 lbs.

==== Receiver ====
  ***Mosfet RF Amplifier**
  ***Preselector Resonate Control**
  ***Sensitivity:** 0.3 uV for 10 dB S+N/N.
  ***Filtering:** 2.6 kHz bandwidth, 1.8 shape factor at 6/60 dB points.  Optional CW Filter - 150 Hz wide, two positions, shape factor 7.2 at 6/60 dB.
  ***AGC Controlled by RF Gain Control**
  ***Meter Automatically Switched to "S" meter when receiving**
  ***Offset Tuning with Defeat Switch and LED Indicator**
  ***Built-in Speaker in Bottom**
  ***External Speaker/Phone Jack**
  ***Less than 2% Audio Distortion**
  ***WWV Reception at 10 and 15 MHz**

==== Transmitter ====
  ***200 Watts Input, SSB and CW, 100% Duty Cycle**
  ***Instant Band Change, No Tune-up Required**
  ***8-Pole SSB Filter**
  ***Automatic Level Control on Front Panel, LED Indicator Shows Operation in ALC Region**
  ***CW Sidetone Fed into Audio Amplifier when in CW Mode**
  ***Sidetone Adjustable for Tone and Volume**
  ***Automatic CW Offset of 750 Hz**
  ***Press-To-Talk**
  ***Meter Indicates SWR When Transmitting**
  ***High Impedance Microphone Input**
  ***RF Output Impedance 50 - 75 ohms, unbalanced.**