Note
QST, May 1981, p. 134.
QST, Feb 1982, p. 183.
The Argosy 525 is a compact, solid-state, single-conversion superheterodyne transceiver.
Basic features:
* Broadband, no tune design
* 50 or 5 watts, switchable
* USB, LSB, CW
* True QSK break-in keying
* Permeability Tuned Oscillator (PTO)
REQUENCY COVERAGE (MHz):
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
(VFO provides approximately 40 kHz overrun on each band edge.)
OPERATING MODES: USB.LSB, CW.
VFO STABILITY: Less than 20 Hz change per °F averaged over a 40° change from 70° to 110° 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.
SEMICONDUCTORS: 42 Transistors. 4 FETs, 10 IC's, 52 Diodes, 3 PIN Diodes, 2 LEDs.
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.
IF FREQUENCY: 9.0015 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).
IF - 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 IF FILTER: Optional plug-in accessory.
Model 220. 2.4 kHz bandwidth. Used in place of standard plug-in 4 pole SSB filter.
NOISE BLANKER: Optional plug-in accessory, Model 223. IF 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.
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 L0 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: 9.0015 MHz 4 pole crystal ladder filter. Balanced modulator. Converts to 8 pole with optional Model 220 filter.
MICROPHONE INPUT: High impedance 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
POWER REQUIREMENTS: 12–14 VDC regulated to 5% or better. 500 mA receive; 9 A maximum transmit. Power switch remotely controls power supply.
References
Use with the Heath HD-1410. QST, Jul 1982, p. 38.
