SECTION Il DESCRIPTION MHz ALL-MODE TRANSCEIVER INCORPORATING A MICROCOMPUTER CPU control with ICBM's original programs provides various operating capabilities. ‘No-backlash dial: controlled by ICBM's unique photocopier circuit: ‘Band-edge detector and Endless System provides: cut-of-band ‘protection. | No variable ‘capacitors ‘or dial gear. wiving problem-free ties. Alb mode capability:: S8B; CW. AM and FM. Operating mode is indicated on:the display unit.
SECTION 111 UNPACKING Carefully ‘remove ‘our transceiver from: the packing carton and examine it for sighs of shipping carnage: Should any be apparent, notify the delivering carrier or dealer: immediately; stating the full extent of the damage.: It is recommended you keep the shipping cartons: In the event storage, moving, or reshipment betimes necessary, they come in-handy. Accessory hardware. cables, etc:; are packed with the transceiver. Make sure you have not overlooked anything.
For DC operation: 1 you would {ike: to use your car battery or:any other:DC: power: supply, be sure that its output voltage is 1215 Volts and the ‘current capacity is at least 3.5 Amps: The maximum power consumption of the sét during transmission reins from: 3736 Amps, so Keep that minimized i the rhinitis installed in your automobile.
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 on the station, or you wish 1o record contacts using 8 tape records connected to the headphones jack, With 4 stereo headphone set inserted this way, however, the headphones will Nose the sound on one side.
SECTION IV CONTROL FUN FRONT PANEL INTERCOMMUNICATION METER; @RF POWER CONTROL MIC GAIN CONTROL: (MIC CONNECTOR PHONES JACK (POWER: SWITCH (FINNEGAN CONTROL: BRE GAIN CONTROL [MODE SELECT SWITCH PASSING BAND TUNING CONTROL GUV SWITCH: TRANSMIT INDICATOR LED FOOTING SPEED INDICATOR LED RECEIVE INDICATOR LED FREQUENCY. DISPLAY.
g 10. POWER SWITCH The POWER Switch isa push-lock: type switch which controls: the input of either A Cor DC power supplies in the 1-851, whichever is used. ‘When the switch is pushed IN‘and locked; power is supplied 1o the'set. When the switch is pushed again and released, power s cut Yo'all circuits except the CPU, if the MEMORY Switch on the rear panel is in the ON {up) position: PHONES JACK Accepts a standard headphone plug for a 4+ 16 obm headphone set.
VFO SWITCH Selects an operating MEO from “A” VEQ and "BY VFO, and selects the other various operations; A=B Instantly sets the Frequency of “BREVE 1o the same a8 that of A’ VEO. NS Sets the MEMORY SCAN ‘unction: Push the MS/MW Button 1o start scanning the three programmed frequencies in: Memory Chiantis 1, i3t A Selects “A” VEQ tor both transmit and receive. A Scan is started by pushing the MS/MW Button while st this setting. 8 Selects “B" VFQ for both transmit and receive.
S1016. TRANSMIT/RECEIVE (T/R) SWITCH This switch s for manually switching from transmit 1o receive and vice versa. Set the switch 1o RECEIVE (up) and the 1-551 15 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 to ON; the T/R switch must be'in the RECEIVE position.
22 MULTI-FUNCTION: METER This meter functions 4s 2 relative RE output ‘meter in: transmit: mode; and as an S‘mater {signal strength meter). in receive mode, unless the MODE Select Switch is set at the F Mic position; In which craze: the mete functions as a discriminator meter in the receive mode. 23 TRANSMIT \INDICATOR :LED When your set is in the transmit'mode; this LED is lit 24 TUNING SPEED (TS} INDICATOR LED Illuminates when the TUNING SPEED Button is pressed to set the dial to kHz-step tuning.
St Pin No | FUNCTION 1 Output from uncontroversial stage. : (37V when squelch is ON) 2 13.8 Volts DC in conjunction with the power switch operation. {Max. 0;34] 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 detector stage. : Fixed irregardless of AF output of AF gain: 5. Output from Transmitter MIC amplifier stage. 6: 8 Volts DC available when transmitting. {relay can not be directly actuated.
36. FUSE HOLDER This holds the fuse for the AC power circuit. | If the fuse is blown, replace it with s new fiche {2 Amp for 117V/1 Amp for 240V} after checking the cause. Open the fuse holder with 3 Phillips head driver. 37.
fasts MINI (MONITOR) CONTROL This: control: adjusts ‘the audio volume of the side tone: (monitor) audio during CW transmit operation. ‘Stadium it Yo your desired feel for easy listening: CW DELAY (W TIME DELAY CONSTANT) CONTROL In: semipermeable CW. operation, this: controls: the transmit/receive switch:over ume delay. Adjust:it to suit your-keying speed: ANTELOPE CONTROL I VOX: operation, the VOX circuit may be operated by sound from the speaker, causing a switch 1o the ‘transmit mode.
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 unit: Proper tuning is necessary for optimum operation: PRESET FREQUENCIES When the POWER switch turned ON, the frequency display will be shown 50.100.0. Tarn the VEG Switch to 7BY, “RAT" and *RB-TA” positions ta see if the same frequency pan be reg 'on the display. Continue muting the VFO Switch to 17,1207 and positions 1o see i 51.000.
TUNING CONTROL “i Rotating the Tuning Knob: clockwise ' increases: ‘the frequency; turning it counterclockwise decreases the frequency in 100HZ steps in the USB, LSB, CW and AM modes and in 10K Hz stepson the EM mode; The smaller vernier marks on the knob represent 100Hz (10K Hz in the FM mode). When you reach 53.999.9 in the SSB, CW or AM modes, or 53.990.0 in the EM mode, turning the Tuning Control Knob clockwise will bring the operating frequency to: 50.000.
1. The Tuning knob tension will become tighter by turning the brake adjustment screw clockwise; and will become looser by turning the screw counterclockwise, 2. While performing this adjustment, the Tuning knob must be turned continuously as the craw is adjusted inc order to sef the tension for a comfortable touch; DIAL LOCK SWITCH Headteacher (G551 s set ar a certain frequency for rag chewing mobile operation; etc.
=18 M When the 1C:651is first turned ON. the frequency displayed on the readout s the frequency: 50.100.0MHz, FOR EXAMPLE: When the set is tared ON; 50.100.0 will he displayed on the readout. This will occur whether the VEO switch sin either the YA’ or "B’ or.combination VFO position; :Rotating the tuning knob clockwise will increase the frequency. and rotating the tuning knob counterclockwise will decrease ‘the frequency in100Hz steps.
RIT {(RECEIVER INCREMENTAL TUNING] By using the [RIT circuit, you can shift the receive frequency +800Hz either side of the transmit frequency without: moving the transmit frequency itself. Therefore, when you get a call slightly off: frequency; ior when the ‘other station’s frequency has shifted you can tune in: the receiving frequency without: disturbing the transmitting frequency.: By pushing the RITE switch down once {it’s & spring loaded switch): the RIT circuit 15 muted ON and the RIT LED is lit.
w20 ‘on the Memory Channels and the: operating frequencies of both A and "B VEQ s are retained vane when the POWER Switch is turned OFF, SCANNING: OPERATION The IX-551 provides various scanning operations, Read the Hollowing instructions carefully to fully enjoy:the 1-581"s many capabilities. MEMORY: SCAN This is o Sean the three Memory Channels continuously: 1. Program thees desired frequencies in Memory:Channels 1,121 and 31 2.0 St the VFO Switch to the "M5" position.
1. Program the ‘frequencies of the high and: low edge of the desired scanning range in Memory Channels [27 and T35 1t does not maser in which: Memory Channel the higher frequency is programmed: For instance, program 50:2MHz i Memory Channel 21 and 50.8MH2 in Memory Channel 3] 2. Set the VRO Switch to "B and the SQUELCH Control above the threshold. By depressing ‘the MS/MW. Button, the scan is started from the high edge of the programmed range {60.8MHz) to the lower frequency.
L SSB: OPERATION 1. RECEIVING After connecting an antenna; microphone, etc. sat knobs and switches as follows.
4. For normal SSB reception, settee AGG switch initiate UP {slow) position, Set the AGC switch in: the FAST downside} position; when tuning or receiving signals: with short interval fading. Wherein the FAST position; the time constants shortened, P.B. (PASS BAND TUNING (When the optional P.B.T. units installed.) The 1-551 has an optional PiB.
24 Other knobs and switches are left in the same positions as for receiving, When the T/R switch is moved to transmit, or when:the PTT {push to talk} switch on the microphone is depressed; The transmit LED is illuminated. | By speaking Into the microphone; the meter needle will move according to the strength of your voice and SSB signals will be transmitted: Hold.
Transmit-release time {the time delay before the set automatically returns to receive when you stop talking) is controlled by the VOX DELAY control. Turning the control counterclockwise makes. the. time shorter. Set it at a position which is comfortable and wish allow for short pauses in normal speech; Adjust the ANTELOPE canticle so that the VO X circuit is not activated by sounds from the speaker by turning the control clockwise while receiving assignation.
Lobe AM OPERATION ¥ 3 RECEIVING Set the MODE Select Switch to "AM”. Turn the Tuning Knob so that the beat caused with the AM signal carrier becomes a "zero beat™”, A incoming AM signal’s carrier and lower side band signal are removed with the crystal filter, and the resulting upper side band signal is fed to the detector, the same for 5SB detection, Therefore, the other procedures are the same as for SSB retention.
3 The NOISE BLANKER and the AGE circuits do not actuate in this mode. TRANSMITTING Bet knobs and switches as follows: MIC GAIN CONTROL Center {12 o'clack) position RE POWER CONTROL Completely Counterclockwise {COMP OFF position) Other 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 Vil THEORY OF OPERATION OUTLINE The IC-BB1 employs. & digital phase Socked loop (PILL circuit as the local oscillator for both transmit and receive. The output of the PLL circuit is approximately MHz below the receive frequency. thereby spurious is Kept to a minimum. The operating frequency 'is: controlled by pulse signals. generated by the optical chopper recruit Located at the tuning knob, being-added 10 or subtracted from the preset frequencies in the micro: computer.
wide dynamic range FET Q19 and then sent to the gate of the first mixer Q18 through the two stage band pass filter L26 and L27. To the source of the high duality FET mixer Q18 a 40MH2z signal is supplied from: the PLL unit through D22 The 9.0115MHz signals sre’ fake from Q18 and tuned by 126 and C88. IF CIRCUIT G.
e3P fed through C63 to Q13, which is a Darling ton transistor with a large DG gain. The emitter of 013 is at:the ground label when the noise blanker is turned ON. When the pulse anise is received the positive edge of ‘the pulse tums ON 013 by the differential circuit, consisting of G638 and the diode resistance between the base and emitter of 013, The negative eye of the pulse is clamped by D185.
to:1:18 through D7 from the PLL circuit and mixed with: the AM, S5B or CW signals fed through D8 ‘from Fi1. Both added and subtracted frequencies are generated by this mixer; but only the signals ‘of the added frequency are filtered through the transmit band pass filter L15 and L16. BUFFER AMPLIFIER (CIRCUIT The frittered 5OMHBZ signals, supplied to the first gate of the dual-gate FET 05 are amplified to approximately ‘Tom W: PEP.
3 SQUELCH: STOP CIRCUIT This circuit provides signals to stop the scan operation by use of the squelch signal in the FM: mode and the Si meter signals 1n the SSB. AM or OW mods. I the SSB. AM or OW mode, the S-meter signals ‘are fod from the collector of 027 through B198 1o Pin 2 of 1C6/2. The voltage set by SQL control B-2 on the front panel is applied to Pin 3, 1C6/2 functions as a comparative.
During transmission; the PTT switch ON; Q28's base is connected to ground through D36; and the output vantage of the receive power supply becomes zeta. D35 connected tithe emitter of Q28 rapidly discharges voltage stored in the receive circuit capacitor to prevent receiver and trans: mutter from: functioning simultaneously daring switching. | At the same time, Q3218 turned OFF, assists base Is ‘connected 1o ground through DAY and $o:the D32 reference voltage is applied to the base of O35 through D39.
REFERENCE FREQUENCY GENERATOR CIRCUIT Reference frequency generator [C3 consists 'of a crystal oscillator ‘and ‘a high speed divider, X1 oscillates at 10.24MHz, which is divided by 1024. The kHz reference frequency is fed from Pin 17 to:Pin 8 of phase detector 162, This 10K Hz reference frequency decides the variation step of the PLL output frequency and the divide number N decides the PLL output frequency. PLL output freq. = local oscillator freq, (MHz) + 0.01MH2 (the reference freq.
LOCK: FAILURE DETECTOR AND MUTE CONTROL CIRCUIT When the lock fails, the pulse signal from Pin 4 is integrated by R18 and C18. When the integrated signal level ‘exceeds the junction voltage of O's base, O1 is turned ON and then Q2 is timed ON. The collector of Q2 is ‘connected to the base 'of 8, so the base voltage ‘of Q6 becomes ground revel; and (6 and Q7 are shut OFF to prevent transmitting unwanted signals. POWER CIRCUIT The PLL Unit has #8V and =8V regulated power circuits. :\When the power s turned ON
With: the: logic level signals, clock: pulse signals and UR/DOWN signals {UD) ate generated by the UP/DOWN control circuit icE :"i: Mlle 1c8 cedilla UP/DOWN CONTROL CIRCUIT = 8 2 SCHEMATIC DIAGRAM e Ks K2 TIMING CHART When the tuning knob is turned When the tuning knob is turned clockwise counterclockwise
The flip-flop of 81 {172.1C2) and G172 1C3) functions as a quad counter and stores the data (0-3) according 1o the dial rotating speed. Ca b Data L=0v H L 2 Hay H H 3 When the power is muted ON, the counter programmed in the CPU sets the operating frequency at 50.1MHz in any rude and sets all of the memory channels a1 51.0MHz: Then pulse signals are fed 1o R2 € and R7.E of the CPU and clear the necessary flipping. Also.
K2{VFO B} This flow occurs ‘when the VEO select switch is set at "B, and ‘the unit operates at the frequency set by "ABLATIVE. R1 > K4 (MS) This flow occurs when the VEO select switch is sett "MS" n this setting, when the flow of coheirs, the thees memory channels are scanned in the order of 12,3, 1,2, 30 b with the flow clock. R1=2 K8 (A SB) This flow occupiers when the VEQ select switch is set The data in the AT VEQ s input to the "B” VFO and the "B VED frequency becomes equal to that of the "A' VFO.
(FM] This flow: occurs 'when the MODE select switch 16 set at “FMY.| When this happens. the display shows “F " and the carrier frequency. (AM) This flow occurs when the MODE select switch is set at “AM'™ The display shows “A% and the carver frequency.
When the power is tarried ON, the CRU Is initialized and then reads the mode advertising memorizes 1t Then the CPU reads the control data from the external controller in the order of the numbers ‘of the matrix and controls the various necessary operations. i The data of the display “ATCVEQ, "INVENTORY, the frequent shift step pitch, Memories and the divide number (N} are pro¢ ‘rammed in each. RAM area for the initial presetting.
When the unit is switched 1o the transmit mode: while the RIT is ON,Pin 8 of 1C17 becomes Elide and Pin 10 becomes Hi level, so that 013 and Q14 [n the PLL unit are turned ON. in the receive dime, (13 and 014 are turned OFF and the receiving frequency goes back to the previews frequency with the RIT ON: TIMING CHART Power Waite WRITS WRITS Tum ol Push down 'Push down Push down Transmit Tuning Knob TRANSMIT & RECEIVE RECEIVE RIT SWITCH RIT LED OFF on | oFr | on overly ARABLE ARABLE VARIABLE VX0 FREQUENCY .
SCAN CLOCK GENERATOR AND CONTROL . TIMING CHART CIRCUIT SCHEMATIC DIAGRAM output The dioceses § SCAN START/STOP CONTROL CIRCUIT This circuit: consists of three mountable multi vibrators and one binary: counter, : The output signals from the circuit control the gates Demesne the R output terminals of the CPU and the K input terminals to provide the scan START and STOP initiate Sean A" Scan “B" and Memory Scan operations; and the Memory Write operation.
tiepin 6 of 1C7 as the STOP 2 signal $o that the RB output of the CPU s fed 1o KT and K2 Yo stop the Sean: Then, if the MS/MW switch is pushed again, the output signal from Pin 13 0f ICC 8 input to Pin 4 of 1C13:to reset the circuit o that:the Li level signal from ICTUS tums Q3 ON; and the B5 output of the CPU is sent to K8 to start the scan again. SCAN START/STOP CONTROL CIRCUIT SCHEMATIC DIAGRAM 10 | Ms/mwn'i l 2 Imogene 00y & . 3 sols MEMORY.
IN. THE SCAN "B MODE SCAN START/STOP The scan START and scan STOP 1 function by use of the MB/MW button, and scan STOP 2 functions by receiving a signal, are the same #5 the operations for SCAN YA made. AUTO SCAN START In the SCAN: "B’ mode, the tanning Stops by receiving a signal. ‘After approximately’ 16 seconds. ‘the scan re-starts automatically.
AC POWER SUPPLY UNIT The: AC power supply built in the Ignitions e newly developed switching regulator system:: providing light weight and a high level of efficiency. PL UNIT The 'AC ‘power supplied: from Pins 2 and 3 of P1iis fed to the memory power transformer L2, ¢ The output voltage from the secondary of L2 18 rectified and filtered by D2 and €7, and switched by 01 before being fed to the SW REG Unit.
SECTION IX VOLTAGE CHA S NOTE: Measuring instrument is a 50KV multi meter. MAIN UNIT TRANSISTORS | {in the USB mode and RF POWER control! in the COMP OFF petition} TRANSMIT RECEIVE R No.| BASE COLLECTOR |EMITTER| BASE COLLECTOR [EMITTER |REMARKS GATE GATE DRAIN |SOURCE WATERGATE. DRAIN [source 138 GND b 38 GND Qi3 0.7 138 GND o 138 GND a4 o7 6a GND o ? GhD i3z 138 138 | 138 138 138 GND Q10 o 12 GND 0 12 GND 012 ais 304 o O 10.2 10.2 O Q15 B 5 1032 5 o 102 o0g 618 are | oND o 5 | oWp 78 08 020 022 =101 4.
PLL UNIT IC Canon. FIN N, REMARKS vlzlslals Tislefnlniniaialselrn ici | Boll] Ne inc 80lnD32/ 801800 | 0 |36 HDMI) ica | 283213210 7000 |0 135 ew 1ca ATTAINDER 70175 256N 0 0 |25|39 39/39 68 0 ICE [11ale0 80 7.4V or OV so cording to operating frequency, Wave form of IC1 Pin 2 Wave form of Stickpin 7 DRIVER UNIT TRANSISTORS TRANSMIT RECEIVE Trevino BASE COLLECTOR| EMITTER | BASE COLLECTOR | EMITTER| Re Marks BAGATELLE ) DRAIN SOURCE INVESTIGATED | DRAIN SOURCE 0.
