Note
QST, Oct 1973, inside front cover.
Beginning in Oct 1975, Henry Radio would add a digital display to a stock TS-520. Purchased together, the cost was $729.00. To have a TS-520 retrofitted with the display cost $129.00.
TS-520S
QST, Jul 1977, pp. 144–145.
QST, Aug 1977, p. 163. (full specs)
TS-520SE
QST, Aug 1979, back cover.
QST, Sep 1979, p. 6. (full specs)
QST, Jan 1980, p. 99.
QST, Apr 1981, p. 164.
---- TS-520S ----
The TS-520S retains all of the features of the original TS-520: RIT control • 8-pole crystal filter • Built-in 25 KHz calibrator • Front panel carrier level control • Semi-break-in CW with sidetone • VOX/PTT/MOX • TUNE position for low power tune up • Built-in speaker • Built-in Cooling Fan
• Provisions for 4 fixed frequency channels • Heater switch.
SPECIFICATIONS
Amateur Bands: 160-10 meters plus WWW (receive only)
Modes: USB, LSB, CW
Antenna Impedance: 50-75 Orms
Frequency Stability: Within ±1 kHz during one hour after one minute of warm-up, and within 100 Hz during any 30 minute period thereafter
TRANSMITTER
RF Input Power SS8: 200 Watts PEP CW: 160 Watts DC
Carrier Suppression: Better than –40 db
Sidebard Suppression Bette than –50 db
Spurious Radiation Better than –40 db
Microphone Impedance 50k Ohms
AF Response 400 to 2,600 Hz
RECEIVER
Sensitivity: 0.25 uV for 10 dB (S+N)/N
Selectivity: SSB: 2.4 kHz/–6 dB, 44 kHz/–60 dB
Selectivity: CW: 0.5 kHz/–6 dB. 1.5 kHz/–60 dB (with optional CW 520 filter)
Image Ratio: Better than 50 dB
IF Rejection: Better than 50 dB
AF Output Power: 1.0 watt (8 ohm load, with less than 10% distortion)
AF Output Impedance: 4 to 16 ohms
TUBES & SEMICONDUCTORS
Tubes (2) S2001A (6146B), (1) 12BY7A)
Transistors: 52
FETS: 19
Diodes: 101
POWER
120/220 VAC, 50/60 Hz, 13.8 V DC (with optional DS-IA)
Transmit 280 watts; receive 26 Watts (with heater off)
