Table of Contents
Summary of Contents for Acom International ACOM Exhibit 8 1000
- Page 1 Exhibit 8 1 -17 International, Inc. Exhibit 8: User’s Manual External Radio Frequency Power Amplifier ACOM 1000 Model 1000 157 Horse Pond Road, Sudbury, MA 01776 Tel: (978) 440-7555 Fax: (978) 440-9080 e-mail: aa1nd@aol.com...
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Page 2: Table Of Contents
Exhibit 8 2 -17 TABLE OF CONTENTS 1. GENERAL INFORMATION ..........................2 1-1. I ........................2 NTRODUCTION AND ESCRIPTION 1-2. O ............................2 WNER SSISTANCE 1-3. E ............................3 QUIPMENT UPPLIED 1-4. F .................................3 EATURES 1-5. S .....................3 AFETY ONSIDERATIONS XPLICIT EFINITIONS 2. INSTALLATION..............................4 2-1. -
Page 3: Equipment Supplied
Exhibit 8 3 -17 1-3. Equipment Supplied The ACOM1000 amplifier and this manual are shipped in a cardboard carton. 1-4. Features • Easy to operate. The TRI is a powerful tuning aid which, together with the automatically controlled input attenuator, helps the operator to quickly and precisely match antennas (5-10 seconds typically). -
Page 4: Installation
Exhibit 8 4 -17 C A U T I O N notes call attention to a procedure which, if not correctly performed, could result in equipment damage, not only in the amplifier. N O T E notes call attention to a procedure which, if not correctly performed, could result in inconvenience. W A R N I N G HIGH VOLTAGE! The amplifier works with high voltages up to 3000V, which are LETHAL! Also, for your safety, pull the amplifier power plug out of the mains wall outlet and WAIT AT LEAST 30 minutes EACH TIME BEFORE you remove the cover of the... -
Page 5: Connections
Exhibit 8 5 -17 C A U T I O N The weight of the unit is about 18kg, which should preferably be handled by two persons. Position the amplifier near the place where it will be used. You'll need an easy access to the command knobs and indicator's area, as well as to the rear panel cabling. -
Page 6: Installation Of External Fan
Exhibit 8 6 -17 N O T E Your amplifier will not work if KEY-IN is not connected properly. Transceiver producers give different names to this output and they are for instance TX-GND, SEND, T/R-LINE, etc. Some transceivers require that "ground on transmit" is implemented via a software command, or by changing the setting of a switch on the rear panel, or interior of the transceiver. - Page 7 Exhibit 8 7 -17 To avoid damage (not covered under warranty) carefully check that the voltage for which the amplifier is set corresponds to your mains nominal voltage (see S.2-2 and table 2-1). After following all instructions in S.2, you can turn ON the main power switch marked “LINE” on the rear panel (Fig.2-1). The red LED indicator above the red ON/OFF button located on the front panel must light red and a black inscription "ACOM1000"...
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Page 8: Operation
Exhibit 8 8 -17 POWER ON OFF LINE ON LINE (ON/OFF S4.1) (NEXT or PREV) (PREV+NEXT) (PREV+NEXT) (+2sec) INFORMATION S.4-4 Forward Power Reflected Power Tuning S.4-3 LCD adj. S.5-1 (PREV+NEXT) S.5-1 (OPER) S.5-3 Output Power Contrast 1...9 (PREV) List of Antenna VSWR Back-light 1...5 (NEXT) Auto-Prot. -
Page 9: Changing Operate And Standby Modes
Exhibit 8 9 -17 Pressing either the PREV or NEXT buttons during this period will result in changing the screen to one of the 14 available information screens described in S.4-4 below. This action will not influence the warming-up process, so you may pass through all information screens, for instance to monitor the High Voltage value or the Exhaust Air temperature. - Page 10 Exhibit 8 10 -17 We recommend that you tune-up at the center frequencies of the preferred frequency band. First select the band switch (never with RF applied!). Then use table 4-1 in order to achieve an approximate preset for both TUNE capacitor and LOAD capacitor knobs: Band, MHz Tune Knob Dial Load Knob Dial...
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Page 11: On Line Information Screens And Control Functions
Exhibit 8 11 -17 Please note also, that the TRI mark will not appear until at least 5W drive is applied, and at least 20W forward power is achieved. If, for some reason, matching cannot be accomplished successfully, check BAND switch and antenna selection. Then check the antenna VSWR at same drive frequency. -
Page 12: Contrast And Backlighting Control
Exhibit 8 12 -17 5-1 Contrast and Backlighting control Press the PREV+NEXT buttons simultaneously and hold them for two seconds. The back-lighting of the LCD will light and the "Contrast=... B.Light=..." screen will appear on the bottom line. Control the contrast of the LCD using the PREV button in steps from 1 to 9. -
Page 13: Tube Replacement
Exhibit 8 13 -17 6-3. Tube Replacement A single 4CX800A (GU74B) high-performance ceramic-metal tetrode manufactured by Svetlana is employed in the amplifier. Replacement is a complex and potentially dangerous operation. For this reason, we recommend this work be carried out by a trained service technician. -
Page 14: The Acom1000 Simplified Schematic Diagram
Exhibit 8 14 -17 6-4. The ACOM1000 Simplified Schematic Diagram See Fig.6-1 ACOM1000 Simplified Schematic Diagram. * The 4CX800A (GU74B) Svetlana high performance ceramic-metal tetrode (V1) with plate dissipation of 800W is grid-driven. The input signal from the RF INPUT jack is passed through a broadband input matching circuit, which comprises... -
Page 15: Troubleshooting
Exhibit 8 15 -17 some components in the INPUT PCB and Rsw. This circuit tunes out the input capacitance of the tube. The swamping resistor Rsw is a termination load for this circuit and can dissipate up to 100W of RF drive power. Cathode resistor Rc creates DC and RF negative feedback, thus stabilizing the gain and equalizing the frequency response. -
Page 16: Functions
Exhibit 8 16 -17 e) Harmonic Output Suppression: 1.8-29.7MHz - better than 50dB below rated output, 50-54MHz - better than 66dB below rated output. f) Input and Output Impedances: - Nominal value: 50 Ohm unbalanced, UHF (SO239) type connectors; - Input circuit: broadband, VSWR less than 1.3:1, 1.8-54MHz continuously (no tunings, no switching); - Bypass path VSWR less than 1.1:1, 1.8-54MHz continuously;... - Page 17 Exhibit 8 17 -17...