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TL-922 LINEAR AMPLIFIER | Radioaficion Ham Radio

TL-922 LINEAR AMPLIFIER

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KENWOOD TL-922 LINEAR AMPLIFIER

KENWOOD TL-922 LINEAR AMPLIFIER

FEATURES

  • Class AB2. grounded grid linear amplifier using two high-performance Eimac 3-500Z power tubes. Covers all bands 160 m through 10 m for SSB. CW and RTTY modes of operation.
  • Highly reliable, it is designed to provide stable, high RF output power for extended periods of continuous use.
  • Low intermodulation distortion through the use of negative H.F. feedback (unique to Trio-Kenwood linear design).
  • Quick Turn-on. Warv-up is not necessary. The 3-500Z tubes are fast heating.
  • Double safety systems, comprised of interlocking switches. One interrupts the high voltage primary circuit while the second directly grounds the secondary high voltage circuit. Bleeder resistors are provided for discharging the high voltage capacitors and "DANGER" warnings are posted at high voltage positions. Please observe all warnings, they are for your protection.
  • Fan motor delay stop circuit comprised of a thermal delay relay will hold the cooling fan on for 140 seconds (TYP) after power is removed from the unit and will measurably extend tube life.
  • Mode switch for efficient linear operation selects between SSB mode for maximum PEP output with good linearity, and CW Mode for low power consumption and heat generation during extended periods of operation.
  • Linear amplification control switch allows straight-through operation without shutting off the unit.
  • Variable threshold will accommodate exciters 80W to 120W (nominal) by varying the ALC threshold level. This prevents overdriving the final power tubes and limits the amplifier to its linear range, guaranteeing low distortion at maximum power.
  • Two panel meters: one meter always indicates the dp) plate current; the second selectively reads (Ig) grid current. (Rf) relative output, or (Hv) high voltage.
  • Rigid mechanical structure: The die-cast side panels effectively support the weight of the amplifier against shocks and jarring during transportation. Recessed side panel handles are provided so the amplifier can be easily carried.
  • Vernier plate tuning dial facilitates easy tuning, particularly for the higher bands.
  • Neat, contemporary appearance. Mechanical arrangement and advanced design match the TS-820 and the TS-520 Series transceivers.
  • Power source selecting: Power source can be selected in two sources (120V ♦—> 240V).


TECHNICAL SPECIFICATIONS

Transmit Frequency Range........................... 160 m through 10 m amateur bands

Excitation Energy Required..........................80W nominal, 120W maximum

Mode and Duty Cycle.........SSB. continuous for 30 minutes CW and RTTY. key-down continuous for 10 minutes

Rated Plate Input.........................................2 KW P E P. SSB 1 KW CW. RTTY

Plate Voltage (at No signal)..........................3.1 KV DC-SSB. 2.2 KV - CW. RTTY

Circuit Type.................................................Class AB2 grounded grid linear amplifier

3rd Order Inter modulation Distortion...........Below —30 dB

Input Impedance.......................................... 500. unbalanced at better than 1.5 SWR

Output Impedance.......................................50 to 75Q, unbalanced

Cooling.................................. ...................Forced Air

Interlock Safety Features..................Primary high voltage circuit cut-off Secondary high-voltage circuit grounding

Thermal Protector........................................Locks out transmit relays if power transformers overheat

Fan Motor Delay Stop Time.......................... 140 ± 30 seconds (on room temperature)

ALC.....................Negative going, adjustable threshold — 8V DC maximum output (typical)

Power Tubes Used.......................................Eimac 3-500Z, two pieces

Semiconductors..........................Diodes. 18 peices Zener diode. 1 piece

Power Requirements........ .......................... 120V, 5A; 220/240V, 14A; 50/60 Hz; for maximum SSB input

Cables Supplied........................ Power cable with 2-pin grounding plug, 2 m long Signal cable (coaxial) with M-type connector. 1.5 m Control cable, 1.5 m

Dimensions................................................ 390 mm (15-3/8") x 190 mm (7-1/2") x 407 mm (16") Values in parenthesis include protrusions

Weight......................................Net 31 kg (68 lbs.)Shipping 38 kg (83 lbs.)

KENWOOD TL-922 LINEAR AMPLIFIER

TUBE SPECIFICATIONS

Filament

Voltage............................................................... 5.0V

Current............................................................ 14.2A

Direct Interelectrode Capacitances (grounded grid)2

Input.................................................................8.3pF

Output...............................................................4.7pF

Feedback.........................................................0.07pF

Frequency of Maximum Rating

CW............................................................. 110 MHz

Operating Position....................Vertical, base down or up

Maximum Operating Temperature

Plate Seal........................................................ 225°C

Base Seals...................................................... 200°C

Cooling...................................... Radiation and forced air

Base.......................................................... 5 Pin Special

Maximum Ratings

DC Plate Voltage........................................... 4000 Volts

DC Plate Current.........................................0.35 Ampere

Plate Dissipation............................................ 500 Watts

Grid Dissipation............................................... 20 Watts

Documentation:

TL-922 Users manual (880Kb .pdf)
TL-922 Service manual (4,17Mb .pdf)

TL-922 Mods by Ed Kulchenko, VE3FWA

Reviving a Modified Kenwood TL-922

MORE INFO BY PA0FRI
KENWOOD TL-922 (TL-922A, TL922) MODIFICATIONS

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