INSTRUCTION MANUAL SOLID STATE HF BAND 400W LINEAR AMPLIFIER MODEL : HL-450B
Thank you for purchasing the Tokyo Hy-Power HF band 400W linear amplifier model HL-450B. The HL-450B is a solid state linear amplifier having maximum output of 400 W (PEP) on HF band, making full use of the latest semiconductor circuit technology. It is best suited for the mobile operation as well as the base station work combining with the optional DC power supply, HP-450. Read this instruction manual thoroughly first so that you may work the amplifier properly. 1.
2. Precaution Note the followings to prevent the failure, and to achieve the best performance of the HL-450B. Check the maximum power handling capacity of the antenna. (Needs 400 W PEP rating at least.) Check also the antenna SWR, and SWR should be lowered to 1.5 or the vicinity by adjusting the element and/or the antenna system when SWR is too high. Never Transmit with no antenna connected to ANT terminal. Maximum drive power is 50 W. Never exceed this limit.
3. Specifications Frequency All HF amateur bands of 3.5-28 MHz including WARC bands. Mode SSB (A3E), CW (A1A), FM (F3E) Output SSB (PEP)/CW 400 W max., 350 W typ., 300 W min. RF Input 50 W DC Power Supply DC 13.8 V 60 A max. Input/Output Impedance Final Transistor 50 Cooling System Forced-air cooling Input/Output Connector UHF (SO-239) Built-in functions 1. Send/receive switching terminal (hard key) 2.
4. Explanations of Front and Rear Panels ① POWER (Power Switch) This switch turns the power on and off. When OFF, the linear amplifier enters the through state. (At the through state, the output power of the radio passes through the amplifier and is supplied to the antenna directly. In addition, the received signal from the antenna is fed to the radio directly.) ② AUTO/MANU (Auto/Manual Band Switch) The band switching modes between auto and manual can be selected by pushing the button.
⑥ DC Power Terminal Connect the HL-450B to a regulated DC power supply or 12 V battery using the included DC power cord. The red cord is positive (+) and the black one is negative (-). 60 A min. (peak) capacity is required. Use the supplied cord of the accessories or the equivalent wire size to avoid the voltage drop. ⑦ ALC Pot This pot is used to adjust the ALC output level. When it is gradually turned counterclockwise, a negative DC voltage is obtained and the RF output is decreased.
⑨ TX (TX Coax Connector) Connect the coaxial cable (50 ) from the radio. ⑩ ANT (Antenna Coaxial Connector) Connect the coaxial cable (50 ) of the antenna. Antenna must have a sufficient power handling capability (400 W), and low SWR value of 1.5 typ., 1.8 max.. ⑪ ACC (Remote Controller Connection Terminal) This is a DIN socket for connecting the remote head (HRC-60, optional parts), which enables turning on and off of the power as well as monitoring various operation status in a remote location.
6. Operation (1) Check the connection of each cable again by referring to the illustration at page 6. Turn on the power of the radio. Leave the power switch of this amplifier off. In the receiving state, the received signal from the antenna passes through the amplifier, and you can hear the received signal sound from the radio. Use an antenna that handles rf power of 400 W PEP minimum. (2) Next, select an empty frequency channel, and check the matching state of the antenna with an SWR meter. Use CW mode.
7. Protection and Treatment for Shutdown The HL-450B is equipped with the following six protection functions, and the LED of “PROT” lights when an abnormality is detected. (1) Over-Voltage The LED of “PROT” lights when the power supply voltage exceeds 16 V. Check the DC power voltage. (2) Antenna SWR The LED of “PROT” lights when the matching condition of the antenna is poor and the SWR exceeds 2. Check the maximum power handling capacity of the antenna, and lower the SWR accordingly.
(7) RF Stray and Odd Shut Down It may happen that a part of the amplified large RF signal intrudes into the radio system to cause such an instable behavior during the transmission, that the transmission signal gets distorted, and that DC power supply voltage jumps up. To cure these troubles, it is suggested that clip-on ferrite cores are inserted at both ends of all the DC power and control cables as well as coax cables. Such ferrite cores are available from Amidon Associates, Palomar Engineers, TDK Corp.
