User Manual
Solid-State 144MHz Band
500W Linear Power Amplifier
Model HL-500V
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1. HL-500V FEATURES
HL-500V is a solid-state VHF/144MHz band linear power amplifier with the
maximum output power of 500W. Switching type AC to DC power supply is
built in. It is great for 2m DX communications as well as EME QSO.
AC voltage is automatically selected between AC 100V and 240V. No rewiring
of AC primary voltage is required, if you change operating AC line voltage.
Only the AC plug change is needed to fit your particular operating location.
A pair of the latest RF MOS FET , MRF151G’s , designed by Motorola, are used
at the power amp stage to achieve a stable output of 500W max. Broad band
design has eliminated the troublesome tuning operation as is needed with a tube
type linear amplifier. Turn the AC power switch and you will be on the air. With
the duct structure for cooling air flow, an ideal cooling effect has been achieved.
RF key circuitry is built in. When the RF driving power is detected, the amp will
be automatically keyed. Also the STBY ( stand-by ) terminal is located at the
rear panel with which the amp is keyed through the radio.
Various protection circuits have been built in such as power supply, antenna, R F
power amp board etc. for the safety.
A large analog meter monitors the forward and reflected power always.
2. CAUTION
There are high voltages running inside the cabinet, such as AC100V, 200V,
DC50V etc. High RF voltage is also generated during the transmission. Do not
open the top cover carelessly.
Rugged antenna with god SWR ( 1.5 or less )must be used to withstand 500W
continuous power.
Do not exceed driving power of 20W ( and/or 50W, if sel ected so ).
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3. SPECIFICATIONS
Frequency : VHF 2m Band ( 144 〜148 MHz Amateur Band )
Mode : SSB , CW , FM
RF Drive Power : 20W and/or 50W ( Switch selectable )
RF Output Power : 500W
In/Out Impedance (Zin/out) : 50 ohms ( unbalanced )
Final RF Power Transistor : MRF151G x 2 ( by Motorola, M/A COM. )
Amp. Circuitry : Class AB Parallel Push-pull
Accessory Circuits : ① M eterings for Pf & Pr
② RF key circuit ( Carrier operated send/receive
switch )
③ Protection circuits for antenna open/short, over
current/Idc, PA unbalance, over drive, over heat )
④
AC Power : AC 100V ~ 240V ( Auto select ) , 1.2kVA max.
In / Out connectors : Type N
Dimensions : 345 x 145 x 390 mm ( WxHxD )
Weight : Approx. 12 kgs. ( 26.5 lbs.)
Accessory Parts : Coax Jumper Cable ( 69 cm ) x 1
RCA plug x 2
Spare fuses 25A x 1 , 2A x 1
AC power cord x 1
Cooling Method : Forced Air with Book Fan
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4. Front and Rear Panels
FRONT PANEL
① POWER : This is a power switch to turn on and off AC main power. At off
position, the signals to and from the antenna will bypass the linear
amplifier.
② OPER. /STBY : At OPER. Position, T/R switching circuit is turned on and the amplifier
will become ready to work.
At STBY, the amplifier will be on s tand-by mode, and amplifier will
be at through state.
③ METER Pf / Pr : As this switch is pushed, meter s cales of “Output power” (Pf) and
“Reflected
Power” (Pr) are changed.
④ DRIVE 50W/20W : This switch will select the driving power from the transceiver i.e.
50W or 20W.Pushing the switch, LED lamp of either 50W or 20W
will light reciprocally.
⑤ MODE SSB / FM : This switch changes the time lag from TX to RX , when using RF
key circuit. At FM, TX to RX switching is made instantly. At SSB,
time lag will be approx. one second. For CW operation using RF
key, set this switch at SSB.
⑥ LED Lamps :
Pf / Pr : Lamps will light as the METER switch ③ is pushed to either Pf or
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Pr.
Drive Power : Lamp of corresponding power level of either 50W or 20W will light.
PROT ( Protection ) : There are protection circuits for “Over drive “, “Reflected
power from antenna “, “Over heat ( inside of amp. ) ”, “PA over
current “, and “ Unbalance of PA units “. When either one of these
works, PROT LED will light indicating that protection circuit has
shut down the amplifier. Turn off the POWER switch and turn on
again to reset the protection. LED will go off.
SSB / FM Mode : Lamp will light as either FM or SSB is selected.
TX : LED will light when the amplifier is transmitting.
OPER. : Lamp will light when OPER/STBY switch ② is turned on.
⑦ METER : Meter will read each power of to and from the antenna , Pf and Pr.
Rear Panel
⑧ ANT : N connector. Connect the cable from the antenna. The antenna
must have a
power handling capability of 500W ( continuous ) minimum.
⑨ TX : RF input N connector. Connect to the radio with the supplied coax
jumper cable.
⑩ FUSE 25A : 25A fuse holder for final amp unit. ( This is not a fuse for AC power
line. )
⑪ GND : Ground terminal.
⑫ FUSE 2A : 2A fuse holder for power supply of control circuit.
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