TABLE OF CONTENTS OPERATION L. L 15 SIDELINE MEW il 29 Vil TROUBLE SHOOTING BLOCK DIAGRAM CONNIPTIONS BOARD LAYOUT. SEPARATE X1 SCHEMATIC DIAGRAM.
SECTION -| SPECIFICATIONS GENERAL Numbers of semi-conductors Regency coverage Frequency resolution Frequency Control Frequency Readout Frequency stability Memory channels Vesalius conditions Antenna impedance Power supply requirement Current drain {at 13.
1 slob glop Lig A 18]\ 430MHz ALL-MODE TRANSCEIVER INCORPORATING A MICROCOMPUTER CPU control with ICBM's ‘original ‘programs provides various operating capabilities. No-balderdash dish controlled by (COM'S unique photos chopper difficult. | Band-due detector and Endless System provides out-of-band protection. No variable capacitors or dial gear giving problem:free use.
SECTION 11} UNPACKING Carefully remove your transceiver from the packing carton and examine it for signori shipping damage. Should any be apparent. nosily the delivering carrier or dealer immediately; stating the full extent of the damage. It is recommended you keep the shipping tartan. in the scent Storage; moving, or reshipment becomes necessary, they come in handy. Accessory hardware, cables, tee. are packed with the transceiver. ' Make sure vou have not overlooked anything. 1. :Microphone: 6.
Ford C operation: 1 you would like 1o use your car battery or any other DC power supply, be sure that its output voltage Volts and the current capacity Is at least 3.5 Amps. The maximum parer con: gumption of the set-during transmission tuns from 3~ 8.6 Am bps; so keep that in mind if the unit is installed in your automobile. Attention should also be paid to the condition of the patter and electrical system.
B HEADPHONES Any good: headphone 'set, including: stereo type; that has 4 ~:16 ohms impedance can be used. With the plug inserted: halfway into the PHONES jack, both ‘the headphones: and: speaker will ‘operate. This is convenient when others wish: to listen In-oh the station, or you wish to record contacts ‘using 4 tape recorder connected to the headphones jack. With s stereo headphone set inserted this way, however, the headphones will foes the sound on one side.
SECTION ' IV .CONTROL FUNCTIONS FRONT PANEL FUNCTIONALISM METER sty ~ TRANSMIT INDICATOR LED SURFER POWER CONTROL: TUNING SPEED INDICATOR LED MIC GAIN. CONTROL: RECEIVE INDICATOR LED and TONE CALLISTO ] FREQUENCY Soulless control N DISPLAY POWER SWITCH PHONES JACK MIC: CONNECTOR. BMW BUTTON LAE GAIN CONTROL MODE: SELECT SWITCH: TUNING CONTROL KNOB (MHz BEEP BUTTON HIE CONTROLLING WTE SWITCH and AGC: SWITCH MEMORABLY SWITCH PILLOCK: SWITCH BOX SWITCH DIRT CONTROL (NOISE BLANKER SWITCH.
4, PHONES JACK Accepts a standard headphone plug for ohm headphone set. Stereo headphones can be used without modification if inserted fully in'the jack. 5. MIC: CONNECTOR Connect the supplied microphone or optional microphone to this jack. The IX-SMBstand-type Electric microphone can also! be used. ' H you wish to use a microphone other ‘than one of these, refer Yo the drawing op page 8. 6. SQUELCH. CONTROL.* Set the squelch threshold -level.
Elects AT VEO for both transmit and receive. However, "B VEQ will follow YA VEO at the same frequency difference they were set at. Example: VB VEO is set 7.6MHz IC4B1A { 5.0MHz) above "A” VO, in this position: as " A VFO s increased or decreased in: frequency "B VEO will follow at the 7.6MHz (5.0MHz) difference. This allows vou to switch from Duplex to Simplex and tune without dosing the frequency split. RA-TB © Sleets "A” VFO for receive and "B VEO for transmit.
“neurotransmitter (T/R} SWITCH ‘Switchblades for manually switching from transmit ‘1o receive and vice versa! Set thud switch to RECEIVE (up} and the IC451A/E is in the receive mode. Set the switch to TRANSMIT (down) ‘and it switches to transmit. When switching with the PTT switch on the microphone or with the VOX switch set 1o ON, the T/R switch must be in the RECEIVE position. VOX SWITCH : This switches the VOX circuit ON and OFF.
21 MALFUNCTION METER This meter Unctions ‘as & relative RE output meter in: transmit mode, and as an Ammeter {signal strength: meter) in receive: mode, unless the: MODE Select Switch is sot at the F Mic position, in Which case the mister definitions as a discriminator meter in the receive mads, 22 TRANSMIT INDICATOR (LED When your sites in the transmit made, this LED s it 23.
PIN No. FUNCTION L Output from squelch control stage. (+7V when squelch is ONJ 2; DC in conjunction with the power switch operation. {0.3A Max.} 3 Connected to Push-to-talk, T/R change-over switch. When grounded, the set operates in the transmit mode; 4 Output from the receiver detract stage. Fixed output regardless of AF output of AE GAIN Central. B, Output from MIC amplifier. {Input for limiter stage) 6. 8 Volts DC available wham transmitting. {Relay can not be directly actuated, BmA Max.) 7.
33. MEMORY. SWITCH When this switch is in the ON {up) position, the power 1o the CPU of the AMICABLE s supplied continuously, even when the POWER Switch on the front panel is turned OFF, to retain afl the programmed frequencies in the Memory Channels, the operating frequencies of the two CEO's, etc.
PREAMBLE POWER SWITCH When: turning this switch: ON; +13.8V DG voltage is superimposed on the antenna feed ins, The vantage can be used far a amplifier power source. (BOA max.y CW MINI (MONITOR) CONTROL This control adjusts the audio volume of the side tone {monitor) audio ‘riding CW. transmit operation. Adjust it to our desired level for says listening. CW DELAY {CW time delay constant} CONTROL : In semi-break-in CW operation, ‘this controls the TX/RX switchover time delay.
SECTION V. OPERATION HOW TO TUNE The following instructions are for tuning in any mode. Please read carefully and understand fully before turning ON:your emit Proper tuning i necessary: for optimum operation. PRESET FREQUENCIES When: the POWER switch is turned ON, the frequency display will be 433.000.0 representing 433.000.0MHz, when the Memory Switch is in the “A”, BB “AIRY, “17 a1 and 13" positions, and the display will show 430.600.0 representing 230.800.0MHz (IC4B1A; 438.000.0 and 438.000.0MHz}.
<160 Tuning Control Knob clockwise will bring the operating frequency to 430,000 0. the fewest edge, and you can continue increasing the frequency from there by continuing to rotate the Knob clockwise. The VEQ endless system functions in the same way when decreasing the frequency from 430.000.0, and will prevent you from inadvertently operating out of the amateur radio band.
frequency is increased or decreased in kHz steps in all modes, and the smaller vernier marks or the Correspondence to kHz steps. VFO SELECT SWITCH The CPU in the ABDICATE contains two "Video's" for both receiving and transmitting. The CEO's are labeled YA VEO and: "B VFO and:are delectable with the VEQ Select Switch. This dual VIREO system gives the IC-A51A/E many very convenient features.
18M Switching from one VFQ to the other VFO does not clear the first VFO. The frequency is retained in the Vets memory. FOR EXAMPLE: I 432.326.0MHz s set with: “AY VEQ, and the VFO switch s set 10 "B7 VFO, the frequency readout will show "B VEO' frequency, but 432,325 MHz s still stored initial” VRO s memory. Returning the VFO Switch to “A” VFO position, and 432 3250 will be displayed on the readout.
If.you change the receiving "B VFO) frequency, the transmitting (AY VEO} frequency will follow the receiving frequency at the same frequency difference. So, first set “A” VFO and B VEO at the frequencies for repeater input/output frequency separation. FOR EXAMPLE: {f you change the receiving frequency from 438.925MHz 10 438 B25MHz, the transmitting frequency will change from 431.305 0MH2 to 431.2250MHz, 50 now you tan access an 431.
onL When the RIT knob is in the 0" position, the transmitting and receiving {frequencies are the same. Rotating the control ‘1o the side raises the receiving frequency, and rotating 16 the () side dowers the frequency. To tune OFF the RIT control. again push the RIT switch once and the RIT LED will go OFF. ‘When the RIT circuit is OFF, the transmit and receive frequencies afe the same regardless of the sifting of the RIT control knob: When the RIT circuit is ON.
MEMORY. SCAN Thesis to:scan the three Memory: Channels continuous. 1. Program three desired frequencies in Memory Channels 1, 2], and 2:::8et the MEMORY: Switch to-the "MBE" position. At this time; the operating or displayed: frequency. s not changed.: 3. Depress the MS/MW Switch, and the: display: frequency starts Scanning the programmed frequencies in the Memory Channels 1,12, 311, BURL L 4.
1. Program the frequency of the high edge of the desired scanning range in Memory Channel(Z) and the frequency of the fow edge in Memory Channel 31 For instance, program 433 2MH: in Memory: Channel (3] and 433, MHz in: Memory Channel 21 2. Set the MEMORY Switch to “B” and the SQUELCH Control above ths threshold. By depressing the MS/MW Button, the scan is started from the high edge of the programmed range 33.8MHz] to the lower frequency.
The Tuning Control does not function while the scan is operating. In Programmed Scan “B' mode. during the 16-second stop of the scanning when the squelch is opened, the VEO can be used freely, and after the 16 seconds, the Sean starts from the frequency set by the VFO s long as the frequency: s withering programmed scanning range. When faster scanning s required in SSB or CW mode, push the TS Button to set the scanning step at kHz .
o4 8SB OPERATION 1. RECEIVING i After connecting an ‘antenna; microphone; efc.
5. 1 cation meter indicates the peak value for a certain period; facilitating reading of the meter 7S function. For normal SSB reception set the AGC switch in the normal position. Set the AGC switch in the FAST [out) position, when tuning or receiving signals with short: interval fading. When in the EAST position, the tootsie constant is shortened. TRANSMITTING Before transmitting, listener the receive mode to make sure your transmission will not interfere with other communications.
“26= 2 lionesses. Set the noise blanker switch and/or the AGC switch for clear reception, the same as for SSB reception, TRANSMITTING Insert the: lever plug into the KEY: Jack ion the rear panel of the unit, and set knobs and switches the same as for CW reception. . By setting the T/R switch fo Transmit, the transmit LED is it and shows that you are ready: for CW transmission. When you key the keyed, the meter needle moves and your CW signal is transmitted.
the MODE SELECT Switch is in the EM-c” position, the meter indicates the off sat of the incoming signals. The NOISE BLANKER and the AGE circuits do not actuate in this mode. TRANSMITTING Set:knobs and switches as follows: MIC GAIN CONTROL Center (12 o’clock) position RE.POWER CONTROL Completely Counterclockwise Ether knobs and switches are left in the same positions as for receiving, Turn the T/R switch to TRANSMIT or push the PTT (push to talk) button on the microphone and the transceiver will transmit.
SECTION. VI " TROUBLE SHOOTING Your IC451A/E 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 to locate the problem and/or solve it through use of this chary, please contact your dealer or ICON distribute for assistance; Problem Possible Cause Solution 1. Power doss notice ON.
CAUTION This set:employs a microcomputer to control frequencies; operating mode and display. The microcomputer has a program to initialize the operating condition of the set. However, sometimes an abnormal figure may be displayed on the display; or the display fails to illuminate, This may be caused by an Intermittent connection of the power plug or the power switch being meathead OFF and Onto quickly. This is oot an equipment malfunction.
