1. Introduction Thank you for purchasing the This compact and lightweight desktop HF linear power amplifier has 2 maximum input power of 135kW. Our solid-state broadband power amp technology makes it the smallest and lightest in the industry. Typical output power is 750W PEPPINESS and 630W CW with the drive power of 75-90W. 2. Cautions 2-1 The amplifier is cooled by forced airflow. Several inches of clearance on the top and the rear wall are necessary to allow for smooth air intake into the fan.
FET bias voltage circuit, etc, are precisely adjusted at the factory, and should not be altered. Doing so, would require readjustment with precision measuring instruments. 2-9 The primary power transformer is factory per-wired for AC115V/230V operation (or as specified by the user at the time of order). Sliding the select switch Located on the bottom of the. chassis can make the voltage change from 230V to 115V. (See AC Power section.
3. Features 3-1 Our solid-state broadband design engineers worked to make the the lightest and most compact quasi TkW HF amplifier in the industry. This world-class compact 750W HF amplifier is the easiest to handle and operate. 3-2 The amplifier’s main PA section includes 4 high power MOS FET SD2933’s by ST Micro, resulting in 7S0W PEP (SSB max.) on HE The amplifier’s broadband characteristics require no further tuning once the operating band is selected.
4. Specifications Frequency Mode RF Drive Output Power Drain Voltage Drain Current Input Impedance Output Impedance Final Transistor Circuit Cooling Method Multi-Meter Input/Output Connectors : AC Power AC Consumption Dimension Weight Accessories Optional Items 1.8 ~ MHz all amateur bands including WAR bands SSB, CW, RITZY BSW typ. (75 ~05W max.) 750W PEP max., 630W CW {type) 53V (when no RF drive) 30A max.
5. AC Line Voltage 5-1 Although the amplifier is designed to work with both AC 115V (100-120V) and AC 230V (200240V), for stability we recommend operation from AC 230V. 5-2 The correct AC plug (not included in the package), must be obtained locally due to the AC plug variations worldwide. 5-3 The AC voltage has been factory preset for 230V use (or as requested by the customer at the time of order).
6-A. Front Panel Description POWER @ PORE. @ ON AIR ® O.DRIVE ® Pr @ volt: FUSE ® HEAT © TORS HYPERCUBE rsh sn o NR ores anon vi a Sg OES = | LG Main power switch ta turn AC power on and off. LED (green @) lights when turned on, OPERATE /STAND-BY switch. At OPERATE, the amplifier is ready to £0 into ON AIR (TX) mode and at STY, it is on STAND-BY mode.
6-B. Rear Panel Description ® © ® GH-—0 -O FUSE STY ALG ADJ GHD, AG ® enn ® STY ® ALC Ground Terminal RCA Jack. Connect the control cable from the ACC terminal (or SEND, TX GND etc.) of the transceiver. The center pin is fo be shorted to ground through the relay circuit of the transceiver. The DC current necessary is 5V, 1mA only. RCA Jack for ALC Voltage Output.
7. Connection & Operation This section explains a one-antenna system commented to the transceiver and an external SUPERPOWER meter TRANSCEIVER ANTENNA pe oo ur METER THEFT +O TOBY HL1. 2KFX 7-1 Connect AC cord and coax cables as illustrated above. Connect the cable from “SEND” to ACC or the remote terminals of transceiver, where it is marked “SEND” or “TX GRIND. These terminal pins are shorted to ground when the transceiver is in TX/ON AIR mode.
7-5 You can now increase the drive level to nearly 80-90W to achieve maximum carrier output power of 630W (CW, RATTY) from the amplifier. If you change to SSB mode, peak voice power will reach approximately 750W. For high duty cycle transmissions like RATTY, SST, or FM modes, it is recommended you reduce the drive power by 30-40% compared with CROSSBOW. In AM mode, the drive power should be strictly reduced to one third of SSB, or 30W at most, otherwise modulated amplitude peaks will be distorted.
8. ALC Connection ALC voltage is available at the terminal marked ALC (RCA phonon jack) on the right upper corner of the rear panel. Negative maximum DC voltage of ten volts (10V) is produced at this terminal when the amplifier is fully driven. This voltage is adjustable with the ALC ADJ. knob located above the ALC jack. If the ALC voltage is properly fed back to the transceiver, we advised you to keep the maximum output power constant or hold the power at a certain level.
9. Protection Circuits There are five major protection functions in this amplifier. If the amplifier has shut down Sor some reason, before re-setting, correct the possible cause of the shut down. Turn off the POWER acne and back on to reset. 9-1 O.DRIVE (Over Drive/ Band Miss-chef) When the drive power exceeds the 100W level, the amplifier will shut down to STAND-BY mode (or receive) in order to protect the input side of the power Fetch. This protection might also activate if the band is set wrong.
damaged. 10. Explanation of Major Circuits Five major circuit blocks are explained in there basic form and using signal flows. 10-1 Main DC Power Supply 10-2 Power Amp, L.P.F. 10-3 RF Power Detector, TX/RX Switching 10-4 Control Board 10-1 Main DC Power Supply The main DC power supply feeds the 50V DC power to the final PA stage.
10-3 RF Power Detector/ TX-RX Switch (PC1398B) As illustrated below, there are two RF power detectors on this board. One detects the drive signal level from the radio and the other monitors the outgoing power and the reflected power from the load (antenna).
11. Trouble Shooting Failure Possible Cause Solution Wainscot | © AC fuses blown @ Replace with new ones. operating @ AC cord not plugged in | @ Plug in securely. @ Interlock switch lifting | @ Screw bolts tightly on the top cover. @ Wrong tap used on power | @ Correct primary wiring. transformer primary Can’t enter @ Remote control cable | (D Check the cable and connect properly, Transmit not connected @ Check drive power, antenna SWR, antenna mode @ Protection circuits on. selector A/B.
12. Parts Layout 12-1 12-2 12-3 12-4 12-5 12-6 12-7 12-8 Top View (Detailed) Top View & Side View (Right) PA (PC1662) Power Detector ( PC1398B ) Control Board ( PC1698 ) Front View Control Board ( PC1698 ) Copper Side LPF ( PC1399B ), AC Control Unit { PC1611) Sub AC Control Unit ( PC1697 ) Freq. Detector Unit ( PCS1733) 13. Schematic Diagrams 13-1 13-2 13-3 13-4 13-5 13-6 13-7 13-8 PC1662 PA (Power Amplifier) PC1398B RF Power Detector PC1399B L.P.E.
CONTROL BOARD (FRONT VIEW) :PC1407B/PC1698 VR101 PF SCALE ADJ = YR102 PR SCALE ADJ VR103 1D SCALE ADJ Shy hh