====== Argosy Model 525 ======
{{525.jpg?150|}}{{:525rear.jpg?170|}}

===== Description =====
The Argosy 525 is a medium power solid state transceiver covering 80, 40, 30, 20, 15, and 10 meters.

===== Reviews =====
  *[[http://www.arrl.org/members-only/prodrev/pdf/pr8210.pdf|ARRL]] (Must be an ARRL member and logged in to view.)
  *[[http://www.eham.net/reviews/detail/838|eHam]]


===== Manual =====
  *[[https://www.tentec.com/?p=1254|Download Operating Manual]] from Ten-Tec.

===== Mods & Info =====
  *{{525brochure.pdf|Sales Brochure}}
  *[[525finals|Final Transistors]]
  *[[http://www.k9ew.us/525_pto.htm|Rebuilding the PTO]]
  *[[525id|Argosy 525 / 525D Identification]]
  *[[http://www.qsl.net/tentec/mods/525mods.htm|Excellent Argosy Mods Article]]

===== Accessories =====
  *2.4 kHz 8-pole ssb filter Model [[220]]
  *1.8 kHz 8-pole ssb filter Model [[218]]
  *500 Hz cw filer Model [[217]]
  *250 Hz cw filter Model [[219]]
  *Audio cw filter Model [[224]]
  *Noise blanker Model [[223]]
  *Internal calibrator Model [[226]]
  *DC circuit breaker Model [[1125]]
  *Power Supply Model [[225]]
  *Mobile Mount Model [[222]]
  *Linear switching kit Model [[1126]]

===== Specifications =====
==== General ====
  ***Frequency Coverage:** 3.5 - 4.0, 7.0 - 7.5, 10.0 - 10.5, 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. (VFO provides approximately 40 kHz overrun on each band edge.)
  ***Operating Modes:** Normal sideband, reverse sideband, cw.
  ***VFO Stability:** less than 20 Hz change per <sup>o</sup>F averaged over a 40<sup>o</sup> change from 70<sup>o</sup> to 110<sup>o</sup> after a 30 minute warmup.  Less than 15 Hz change from 105 to 125 VAC line voltage when using a Ten-Tec power supply.
  ***Tuning Rate:** Vernier, 18 kHz per revolution, typical.
  ***Dial Calibration:** +/- 2 kHz when zeroed to the nearest 25 kHz marker.
  ***Antenna Impedance:** Low impedance unbalanced (coaxial), 50 - 75 ohms.
  ***Power Requirements:**12 - 14 Vdc regulated to 5% or better.  500 mA receive; 9 A maximum transmit.  Pwer switch remotely controls power supply.
  ***Semiconductors:** 42 Transistors, 4 FETs, 10 IC's, 52 Diodes, 3 PIN Diodes, 2 LEDs.
  ***Construction:** Rigid steel chassis.  Dark painted, molded front panel.  Dark painted aluminum back, top and bottom.  Stainless steel tilt-up bail.
  ***Dimensions:** HWD 4" x 9.5" x 12" (bail not extended).
  ***Net Weight:** 8 lbs.
==== Receiver ====
  ***Sensitivity:** 0.3 uV for 10 dB S+N/N, typical.
  ***Selectivity:** 4 pole crystal filter.  2.5 kHz bandwidth, 2.7:1 shape factor @ 6/50 dB.
  ***Audio Output:** 1 watt at 8 ohms with less than 2% distortion.  Built-in speaker.
  ***I-F Frequency:** 9 MHz.
  ***Notch Filter:** Greater than 50 dB rejection notch, tunable from 200 Hz to 3.5 kHz.
  ***S-Meter:** Automatically switched on when receiving.
  ***Spurious Responses:** More than 50 dB down except 28.980 MHz (which can be eliminated by using low end of 29.0 - 29.5 MHz band segment).
  ***I-F Rejection:** 60 dB.
  ***Offset Tuning:** Receiver, +/- 3.0 kHz, typical, detent center off.
  ***Crystal CW Filters:** Optional plug-in accessories.  Model [[217]] has 500 Hz bandwidth, Model [[219]] has 250 Hz bandwidth.
  ***Crystal SSB Filter:** Optional plug-in accessory.  Model [[218]] has 1.8 kHz bandwidth.
  ***8 Pole Crystal I-F Filter:** Optional plug-in accessory Model [[220]].  2.4 kHz bandwidth.  used in palce of standard plug-in 4 pole ssb filter.
  ***Noise Blanker:** Optional plug-in accessory, Model [[223]].  I-F type, 50 dB blanking range.
  ***Audio CW Filter:** Optional plug-in accessory, Model [[224]].  Center frequency 750 Hz.  Position ONE has 450 Hz bandwidth down 10 dB at 400 Hz and 1500 Hz.  Position TWO has 150 Hz bandwidth, down 40 dB at 400 Hz and 1500 Hz.
  ***Calibrator:** Optional plug-in accessory, Model [[226]].  25 kHz crystal type, pulsed tone.

==== Transmitter ====
  ***DC Power Input:** 100 or 10 watts, switchable.  100% duty cycle for up to 20 minutes, all bands.
  ***RF Power Output:** 40 - 50 watts in HI power position, 4 - 5 watts in LO power position.
  ***T/R Switching:** PIN diode antenna switch, push-to-talk on ssb, full break-in (QSK) on cw.
  ***CW Sidetone:** Internally generated.  Adjustable tone and volume independent of af control.  Operates only in cw mode.
  ***SSB Generation:**  9 MHz 4 pole crystal ladder filter.  Balanced modulator.  Converts to 8 pole with optional Model [[220]] filter.
  ***Microphone Input:** High impdeance crystal, ceramic or dynamic.
  ***Carrier Suppression:** 40 dB minimum.
  ***Sideband Suppression:** 30 dB minimum at 1 kHz tone.
  ***Spurious Output:** Less than -45 dB.
  ***Meter:** Indicates forward or reverse peak power on transmit, front panel switch.
  ***ALC Control:** High power only.  LED indicator.