144MHz FM TRANSCEIVER INCORPORATING A MICROCOMPUTER CPU control: with 1CGM's original ‘programs: provides various 'operating capabilities. : Frequency control band edge ‘detection, and the ‘display are ‘accomplished by the microcomputer. The B-channel: memory: is: controlled electrically: by ‘the use of:a 256-bit RAM area.
St 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. 1t is recommended 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: 1.
B ‘Angle adjustment Optional installation L POWER REQUIREMENTS The transceiver s supplied ready to operate from any regulated 13.8V DC, 6 ampere negative ground: source. An ‘automobile 12 belt, negative ground, system is rustically more than adequate. Same note must be: taken, however, of the condition of the hydroelectrically system.: Rems such as low! battery, worn! generator/alternator, poor voltage: regulator, etc.
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 50 ohms impedance is recommended, fixed or mobile.: In: VHE. as well as the low bands, every watt of ERP makes some difference. Therefore, 25 watts average output plus 3dB of gain antenna equals 50 watts ERP, presuming low \SWERVE iof course; 'The few more dollars invested ilia gain type antennas well worth it When adjusting your:
ON. 1V CONTROL FUNCTIONS. FRONT PANEL (SCAN STARTER SWITCH IS TRANSMIT INDICATOR TUNING SPEED SWITCH RECEIVE INDICATOR FREQUENCY: SISF’LAV_I {DEDUCTION COMMEMORATOR. s Witch ; SWITCH R CONTROL APICAL CONNECTOR L. g add ion (TUNING CONTROL. KNOB {SQUELCH: CONTROL nd 5 HE POWER SWITCH MEMORIZATION SWITCH L VOLUME CONTROL and {STONE CALL SWITCH POWER SWITCH (DEMONSTRATOR SELECT SWITCH {TRANSISTOR SWITCH 1.
4. AlB: The Memory Switch set at the A" position, selects A VEQ for both transmittance receive. When the Memory: Switch is set at:the BT position, "B” VED is selected for both transmit and receive. 11 the either cases, A VEQ and “B” VF do not have a relationship, and both Volume's can be used independently.
186 186. 1 When the scan has been stopped by auto stop or by depressing ) SCAN STOP SWITCH, by depressing the SCAN START/STOP SWITCH to restart the 'Sean; it will start from the stopped memory channel or regency: SCAN STOP SWITCH Manually stops any of the scan functions. VOLUME CONTROL and POWER SWITCH When ‘the control s ‘turned completely counterclockwise; the prows is OFF.
REAR PANEL ANTENNAE CONNECTOR ACCESSORY. SOCKET MEMORY SWITCH EXTERNALIZE SPEAKER JACK 18, ANTENNA CONNECTOR This s Used 1o contact the antenna to the set. 1ts impedance is 50 ohms and connects with a PL:259 connector: EXTERNAL:SPEAKER JACK ‘When: an external speaker: sued; connect it to this jack, Use'a speaker with an impedance of B ohms.
1 ACC SOCKET CONNECTIONS Rodeo emboss QOM BB 000 ee Outside view PIN No. FUNCTION 1 Output from squelch contra stage. (37V when squelch is ON) 2. 13.8 Volts DC in conjunction with the power switch operation. {0:34 Max.} 3. Conn acted to Push-to-talk; T/R change-over switch. When grounded, the ser temperateness the transmit mode. 4 Output from the Receiver ‘detector stage. Fixed putout regardless of AF output of AF gain. ‘ 5 Input to Transmitter MIC amplifier stage. B B Volts DC available when transmitting.
HOW TO TUNE The following instructions are for tuning. Please read carefully and understand fully before wiring ON your unit: Proper tuning is necessary for optimum operation. PRESET FREQUENCIES When the DOWER switch is turns ON; the frequency display will show [F MHz. 5 for 146.010 Turn the Forevermore: Switch from YA 10 "B” positions 1o see If the: same frequency: can be read on the display. By continuing to tum the Memory Switch to the /[I7, #priory 430 g Memory Channels are preset so.
receiving and is selected by placing the MEMORY Switch in the “A” position, The transmit and receive: frequency will be controlled by A VEO. displayed on the: piquancy display and stored in A" memory. However "B VEO will follow "A" VFO at the same frequency difference they were sett.
M Switching from one VPO to:the other VFO does not clear the first VFO. The frequency is retained in the VEQ s memory. FOR EXAMPLE: With the FUNCTION Switch in the position, if 146.520MHz is set with A" VFO, and the MEMORY Switch: is set to "B VFO, the frequency readout will show "BY Vets frequency; bt 1468.520MHz 15 still stored In “A” CEO's memory. Returning the VFO switch 16 A VFO position, and 8.520 will be displayed on the readout.
L1 15 you: change the receiving (VA7 VF frequency, the transmitting ("B VFO) frequency: will follow the receiving frequency at the same frequency difference. So, first, 'set “A” VFO and YBYVFO at the frequencies for repeaterinput/output frequency separation. This makes repeater operation simple: FOR EXAMPLE: 1f ‘you change the receiving frequency from 145.025MHz to 145.126MHz, the manumitting frequency will change from 144.725MHz to 144.825MHz, so now you can access an 144.825/ 145:125 repeater.
and programs the new frequency 146.940MH2 into Memory Channel 1. 4. Program:any desired frequencies in: Memory: Channels 2 through 6 in the same manner. Memory Channels (71 and {2 are used also for Programmed Scan. For Programmed Scan operation, refer to SCANNING OPERATION, MEMORY. READING Set the MEMORY. Switch to the desired Memory Chan net [11, whichever frequency: the ‘memory was Set, ‘that previously programmed frequency espaliered: \When: the MEMORY Switch is set back the previous operating frequency-
17 To stop the scanning without the autos stop ‘actions, depress the Scan Start/Stop Switch or Scan-Stop switch, | To restart the scanning, depress the Scan Start/Stop Switch again. When the scanning hay been stopped by: depressing the: Scan Start/Stop Switch, the scanning will start from where: the MEMORY Switch is sat. Whine the swanning hiss been stopped by depressing the Scan-Stop Switch or with the autos stop action, the scanning will start from the stopped Memory Channel.
1f the squelch is engaged, and the Scan-Stop-Mods Defect Switch is In the BUSY (out} position, the scan stops when the squelch is opened and a signal is received. 1 the squelch i not engaged when the Scan: Start/Stop Switch has been depressed, the scan does not stop at any signals: 1 the squelch is ‘opened by a signal and the Scan-Stop-Mode Select Switch is in the EMPTY {lacked in) position; the Sean stops when the squelch closed and 4 channel is empty.
w0 9.° The scanning speed can be adjusted by the SCAN SPEED Control located on the driver unit inside cover. Rotating the control clockwise makes the scanning speed faster. The Tuning Control does not function:while the scan is operating, RECEIVING Make:sure the Volume Control and Power Switch sin the OFF position. then connect the power. supply cord to the: power: connector: The red lead should be connected 1o the positive side of the Power source and the black lead to the negative side.
For repeater operation; set (1) FUNCTION Switcher “DUPONT DURER S or YA=B position. In:the “PUD-N" position; the transmitting frequency: is:BOOK Hz below:the receiving frequency. Ik the “PUD-R* position, the transmitting frequency is 600K Hz above the receiving frequent: The receiving frequency can be selected by any position of the MEMORY Switch. in the “A=B" position; the receiving frequency's selected by the "A” VFQ or "8 VFO, and the transmitting Frequency is selected by the other Y FO.
SECTION Vil TROUBLE SHOOTING Your 1G-255A 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: notable to locate the problem and/or solve it through use 'of this chart; please contact your e QB dealer or: ICON distributor for assistance.. Problem Possible Cause Solution 1. Power does not come ON when the switch is turned. Power cord s connected.
Problem Possible Cause Solution: 8, The frequency does ot change by rotating the Tuning knob. MEMORY. Switch set i one: of ‘the: memory: channels. Set the MEMORY. Switch 1o the A" or "B position; The receive mode functions : properly and your signals are transmitted, but you are unable to: make ‘con: text with another station (When' desire ing SIMPLEX mode.} {When desiring: DUP: LEX mode.} ‘The FUNCTION Switch is in the DUN, DUPE or A=B position.
CATION X VOLTAGE CHARTS NOTE: Measuring instrument is 8 50KV multi meter. MAIN UNIT TRANSISTORS TRANSMIT RECEIVE ARES COLLECTOR (EMITTER! BASE COLLECTOR T EMITTER TA Ne. REMARKS TAILGATER DRAIN SOURCE LITIGATE DRAIN SOURCE a1 | onp oND. | 0 62 sNo | e P 036 oND | D 90 GND a7l an Np e 64 GND GND | 07 o GND Qi1 114 50 Q12 8.8 108 2.0 84 114 130 31 [0 138 Gno | b7 0. GND MAIN UNIT 1C IN: TRANSMIT MODE Icon. PIN No.
PLENITUDE TRANSISTORS {When the operating frequency is 145.000MHz.) TRANSMIT RECEIVE H NG eé\ge Emggsa gags Emergent Hearkens CARTEL Locate DRAIN | 'SOURCE ELONGATE ' DRAIN | SOURCE Disclose 28 93 838 28 9.3 Q2 0.55 o GND 0.6 9 GND a3z 1,85 145 8.3 168 Q.15 1.65 70 bios a8l GND 1.4 195 GND 74 198 o8y 055 Q12 86 82 Fig 8.3 9 9.3 PUNITIVE PIN No.
