SECTION 1l ‘DESCRIPTION Use of Microcomputer This IC-280E s the world’s thirst amateur transceiver with a P-channel MOS 4-bit microcomputer. Frequency control, band-edge detection, and the display are accomplished by the microcomputer. The multichannel memory is ‘controlled electrically by the use of 4 RAM area.
SECTION "HE INSTALLATION Unpacking: Carefully remove 'your transceiver from the packing carton and examine it for signs of shipping damage. Should any be apparent, notify the delivering carrier or dealer immediately, stating the full extent of the damage. ‘It is recommends You keep the shipping cartons. In the event storage; moving, or reshipment becomes necessary, they. come in handy.. Accessory hardware, cables, etc., are packed with the transceiver.: Make sure vou have not overlooked anything.
Angle adjustment Optional installation: Power Requirements: The transceiver is supplied ready to operate from any regulated 13.8V DC. 3 ampere negative grand source. An automobile 12 volt, negative ground, system is usually more than adequate. Some note must be taken, however, of the condition of the vehicle’s electrical system. Items such as low battery, worn generator/slternator, poor voltage regulator, etc., will impair operation of Your transceiver as well as the vehicle.
Antenna: The most important single'item that will influence the performance of any communication system is ‘the antenna. For that reason. a good, high-quality; gain antenna of B0 ohms: Impedance is Fa commended. fixed or mobile. . In VHE a3 well as:the low bands. every watt of ERP makes moss difference. Therefore; 10 watts average output plus 3dB of gain antenna equals 20 watts ERP, presuming low SWERVE of course.
CATION IV CONTROL FUN 3 FRONT VIEW 48 Frequency. Displays & Duplex/Simplex Switch {21 Iterative dilatation S Dl Misdo Switch 1T Transition Indicator: Emory-Wiite Switch T Meter 6 Memory: Chanel Switch, B Tone Col Button: W MIC Connector AB VOL Canto) ane Bows. 10 Book Control and: ENJOIN Edited High/Low Fowler Switz 8 Ting Contest . Transmit indicator: : Illuminates in the transmit mode. Receive Indicator: illuminates in the receive mode. (When squelch opened) .
CONTROL INSTRUCTIONS Duplex/Simplex Select Switch For repeater use, set this switch to the Duplex position by depressing to the locked in position. Ry depressing again, the switch returns to the out position for Simplex operation. Duplex:Mode Select Switch There ‘are ‘two modes: Tor: repeater operation. With: most repeaters, the required transmitting frequency :(repeater input frequency} is B00KHz below the receiving frequency {repeater output frequency ).
SECTION V. OPERATION Initial Preparations: Make sure the: VOL Control ind: Power OFFEND Switch sin the OFF position, then connect the power supply cord tithe power connector. The red lead should be connected fo the positive side of the power source and the black lead to the negative side. In the scent that haste leads are improperly connected, the: transceiver will not function.: Reversing polarity will blow aut the Tues in:the prows supply cord due to actuation of the protective circuit.
1f the lower output power is sufficient, set 1) 8QL Control and High/Low Power Switch to the LOW: {out] position: Depress the PET switch an the microphone for transmitting and release for receiving: ‘Speak into the microphone with your normal speech level for the proper microphone level.
OPERATION General The 1C-280E Has 2 digital Phase Locked Loop circuit for its local oscillator: The PLL circuit is controlled with a programmed microcomputer developed by ICON. The band edges, memory channels and duplex setting are programmed in the computer. The: received signal is mixed with: the output signal of the PLL circuit and converted into the 10:895MHz IF signal. . This signal goes into: a crystal filter to reject any nearby signals and then is mixed with the 10.
13 AF Circuit The demodulated signals are fed 1o the emphasis desirous to equalize the high pith tone which is pres emphasized at transmit. Then the signals are fed to the 1C4-1 attenuation element which turns ONESELF the audio signals by the signals from the SQL circuit. The output signal from 10414 Fed 1o the control unit through 41, SQL Circuit The signals from the demodulate circuit are also supplied to the squelch circuit.
Power Circuit The main unit hiss a continuous 8V regulator, Q7 and a receive mode 9V regulator, 08. By supplying the voltage 'to: D15 Zenger diode ‘through: RE6, the base voltage of Q7 is set: at 8.
15 VCO circuit Q8 isi an oscillator and: 09 s 3 buffer. i n the transmitting mode; the VCO signal is frequency modulated by the audio signals from the microphone through the varicose D8, and the output frequency is the transmitting frequency: In:the receiving mode, the oscillating frequency is shitted down by the value of the IF frequency by shorting C41 and C43 through: D7, Buffer and per-driver circuit Qs the: VEO: butter; Q10 the transmitting buffer, Q11 the transmitting per-driver.
The pulse signals are put out at RO-R2 of the CPU in order, synchronizing with the 7-segment display data outputs 01:07 and 01:03 ars tried ON by these pulse signals.: O1 s for the MHz LED, Q2 is for the T00KHz LED and Q3 s for the kHz LED.: When the power is turned: ON, Q4 turned ‘ON ‘and: the display operation becomes possible.: Q1 s turned ON by the RO signal, and: 2-roentgen signals (O1-07}) are fed to 1C12 for the IMHO display.
Alec Your 1C-2680E has been tested very carefully at the factory before shipping.: The chart below has been designed to help you: correct any problems:which are not equipment malfunctions. If you are not able o locate the problem and for solve it through use of this chart, please contact your dealer or ICON distributor for assistance. Problem Possible: Cause Solution 1. Power cannot be turned ON. tn proper connection of the power cord.
SECTION IX VO GE CHARTS NOTE: Measuring instrument is a 50K (/V multi meter. MAIN UNIT TRANSISTORS TRANSMIT RECEIVE: BASE COLLECTIVIZATION) BASE COLLECTOR EMITTER Tr No. |REMARKS GATE LEGATE 2 DRAIN SOURCE|GATET|GATES 'DRAIN | SOURCE o 02 “o70 GND Squelch a8 035 59 aNp R Squelch 06 9.5 9 eNp | Ses a7 9 128 -85 91 130 86 o8 02 128 frame) 10 52 1300 1134 a 134 o0 128 15 184 134 o 134 [Output Low MAIN UNIT IC IN. TRANSMIT MODE FIN No. oo, T3 aTa s le e ainlnlnlnie e 11 102 13 14/0.3 ] woolen[ | 70 7.
PLL UNIT TRANSISTORS TRANSMIT RECEIVE TR NG, Beige Eighteen Bé\gE REMARKS CARE GATE 21 "DRAIN SOURCE GATE LIGATE 21 DRAIN SOURCE Qi .08 32 GND: 085 o GND a2 087 0.01 GND. 085 o GND Qi3 GNR 0.7 40 GND. a6 1.2 8 Q.58 015 88 @8 Deleted Qg Regretted Qi w12 80 2.1 10 0.22 0.2 G 078 °8.2 0.5 0.9 013 oR] Qiz * BND: * ¥ GND. Q13 4.8 7.8 4.0 802 D3 008 Q14 0 048 012 13 85 o7 Q15 0.65 201 GND: 065 0.0 GND. A When the ook is released; goes 1o BV i When the lock released, 'sops to OV or hear.
DRIVER UNIT TRANSISTORS (Continued) TRANSMIT: RECEIVE: TR No. Bgéi‘:‘ Courbet Osage Emitter REMARKS GATE HATE R DRAIN SOURCE [GATE 1 GATE 2| DRAIN SOURCE Qi1 o 024 GND .65 04 GNE Q12 128 B84 Q15 Retarded 018 78 G B89 7.8 Q 88 DRIVER UNIT IC IN. TRANSMIT MODE PIN NG 1o No. gladiolas 3518 REMARKS 163 7.6 & ' ENDING 190 [INDIGNATION 7.6 [GNDI2.0 0 0190180 1G5 A0 W INDUS I CONDIGN 1C6 201 wie 0l Sondra 18 18018080 100 melanin 0008 w194 76 IBTI04 .
