FDK Multi 3000 Desktop VHF Transceiver Instruction Manual

: June 13, 2024
: FDK

FDK Multi 3000 Desktop VHF Transceiver

FDK-Multi-3000-Desktop-VHF-Transceiver-PRODUCT

INTRODUCTION

Our products are all controlled in our production line however, if there is any problem on the transceiver due to mishandling, for example, please contact your dealer.
We have reserved right to modify some part to improve this equipment without giving any prior notice to users.

FEATURES

The transceiver model MULTI-3000 is a digital PLL base station equipment for 2 meter band equipped with dynamic UP/DOWN counter tuning systm for channel selection.
The newest digital technique allows to present this multi purpose transceiver from novice to expert. UHF band transverter model MUV-430A. • UHF band is applicable to this transverter as optional equipment.

AC and DC power supply

MULTl-3000 is designed as a base station transceiver yet DC power source of 12 volts is useful for mobile operation.

Selector

The switch selects position of +lMHz, + 600KHz, position A of repeater offset and simplex.
Position A allows to shift frequency for repeater + or – as desired within 4 MHz of range.

Multi Selection System

2 way tuning system is available but it is convenient to change frequency by synthesizer knob for FM mode and by UP/DOWN counter tuning dial for tuning in case of CW and SSB modes.

2 Steps Dynamic Up/Down Counter

2 different frequency step system by tuning dial is prepared for FM mode with lakhs/lakh and for CW and SSB mode with Lodz/lakhs respectively. This system allows very quick QSY.

Easy Read-Out of frequency due to adoption of Large Size LED;

Large 7 digit LED displayer allows direct frequency read-out down to lOOHz enabling to select channel quickly.

Front Panel Speaker;

The speaker installed in front panel of the transceiver provide better sound.

Memory System for Quick QSY;

A push switch changes 2 pieces of CMOS IC. Memory switch and operation of tuning dial make a good combination work similar to operation of 2 VFO system.

Adoption of Effective Noise Blanker

New idea in noise blanker is effective for elimination of noise pulsation coming from mobile ignition or alternators. The noise blanker is operable at CW and SSB operation.

Headphone Jack in Front Panel

Headphone is usable.

VOX Function

VOX function .h is effective for automatic switching of TX- RX positions when operator starts talking to microphone without touching PTT switch of microphone. At the time of CW operation, it will be in the condition of semi-break in.

Meter System

2 meters are adopted in the transceiver, one of is for indication of Signal/Power and another one is center meter for FM mode operation. Signal/Power meter acts as S-meter in case of reception and as output power meter in case of transmission. Set needle of the meter to center position for FM mode through control of RIT knob or adjustment of the tuning dial which results tune into signal coming from the other station.

INSTALLATION AND FUNCTION

Step Output Power (Hi/Low)

A toggle switch can change RF output power of 1 W and !OW. Emission of 1 W output is enough to local QSO.

Protection Circuit in Final Stage Transistor ( APC)

Protection circuit prevents damage of final transistors when over current is induced there incidentally, for instance, owing to extraordinary affair happened in antenna circuit.
Matching, short circuit of antenna and power transmission without connection antenna, etc, do not give serious affection to the final transistors.

Balanced Mixer;

In order to eliminate spurious radiation adequately, FET(3 SK 40) balanced mixed is adopted in Heterodyne circuit.

RF Gain Circuit;

A toggle switch select one of 2 position of RF gain for DX· (Long range) and LO (local). The selection is required some time in order to get proper channel rejection and will suppress ineffective input signal. The equipment can reproduce clear signal owing to control of the RF gain knob accordingly.

Unitary Modules

Each module has function independently and composing PLL unit, Up/Pawn counter unit, TX and RX units, etc. The transceiver is consisting of 20 modules in total to keep good facility in regard to maintenance and production efficiency.

INSTALLATION

Power Source

It is not necessary to prepare special DC power supply unit like mobile transceiver do. AC power source is available in your house.

Antenna Installation

G.P and Yagi antenna are popular. Make conditioning for matching by using SWR meter to get figure less than 1.5. If your condition do not allow to limit extension of coaxial cable less than 15 meter, We recommend you to apply high performance cable such as RG-8/U. In case of showing high SWR
figure, it will be troublesome for antenna to absorb RF power and antenna protection circuit may break contact of relay for transmission.
When you install Yagi antenna on the roof, antenna support will help you for easy working. Take care of wiring of coaxial . cable with antenna terminals and cover the connecting parts in water proof with vynil tape.
It is recommendable · to erect triangle tower or pipe mast for antenna system (12 -25M Hight). They v, ill he found in your ham shops. Characteristics of G.P antenna is indirect and covering area is limited for QSO in distance accordingly and signal selectivity is in perfect.
Yagi antenna has function to pick up signal and emits power in a limited direction efficiently, thus requiring rotation of the antenna around the tower.
The most recommendable antenna system is therefore to apply both G.P. and YAGI antennas and to switch them according to your purpose, G.P. for watching the stations in reception and YAGI of multi-elements for DX QSO.

FRONT SIDE DESCRIPTION

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PRECAUTIONS

The MULTI-3000 is designed for safe operation, but be sure to observe the following instructions for trouble free, enjoyable operation.
Do not transmit without connecting an antenna.
Be very careful about the power supply polarities. Do not mistake the AC cord for the DC cord· or vice versa.
Do not connect or disconnect the power cord when the power switch is in the ON. position.
Use the SA fuse in the fuse holder on the DC cord when operating on DC; or the 2A fuse in the fuse holder in the rear when operating on AC.
The MULTI-3000 possible to transmission for a long time, but it is suggested that continuous transmission not longer than 30 minutes be avoided as much as possible.
All the cores and trimmers inside have been adjusted, and therefore should not adjustment. already require
If the synthesizer cannot be locked, turn the power switch OFF, wait for 4 to S seconds, and then turn it ON again.
Make sure that the SELECTOR switch and the MODE selector switch are in the correct positions. Also check the RIT knob and see that they are also in the correct positions.

ACCESSORIES

The MULTI- 3000 has the following Please check that you have all of them.

FUNCTION

POWER

Power switch is in position Up/ON and Down/OFF. Do not make power switch on and off during transmission as the life time of the switch will be shorten.

AF GAIN

Knob rotation to clockwise direction increase audio sound. Set it at suitable position.

SQUELCH

At the time of waiting input signals, there have noise in a certain extent. Rotate the knob of squelch control clockwise slowly and then the noise will be suppressed adequately.
Stop rotation there and you will hear voice without noise only when the equipment receive input signals. When intensity of the input signal is in low level or not enough to catch it adjust position of the knob again.

MIC GAIN

When turning the knob clockwise, microphone increases gain and when you talk to the microphone far from it, adjust the gain.

RF GAIN/Pull TONE

RF GAIN is to control RF amplifier as explained previously and tone burst/ tone squelch is effective when pulling the knob. (optional purpose).
Tone burst frequency is 1, 750Hz in the European version and tone squelch unit is for the USA version.

RIT

RIT knob is to compensate frequency drift of input signals.
Clockwise rotation increases chasing frequency and the counter-clockwise reduces it within variable range of ±3.SKHz.

MODE

4 modes are available, namely FM, USB, LSB and CW.

SELECTOR

This is selector of repeater offset positions, They are · -1 MHz, -600 PHz, SIM PIEX, + 600 PHz +1 MHz and position A according to direction of rotation. Refer page 15 of this manual regarding the position A and how to set desired frequency for special offset.· Selective range of the position A is limited in + 4MHz.

SYNTHESIZER

There are 3 knobs to change frequency of synthesizer for l<?M operation. They are functioned to change frequency in the order of MHz, lakhs and lakh. In addition, 5KHz shift is available by 5KHz ON/OFF switch.

SYNTHE. VFO

This is Up/Down counter dial ready for operational facility at SSB and CW operation. Clockwise rotation of the dial shifts frequency upward and the counterclockwise shifts it downward.
Shift range of frequency is from 144.000MHz to 147.999.9MHz and the shift is stopped at the edges of the band automatically.

MEMO

MEMO push-switch is useful to memorize special frequencies by it’s ON-OFF action. The switch is effective when you operate with SYNTHE VFO dial. The following is one of example of FM mode operation.

Set digital frequency at 145.000MHz by Synthes VFO dial and memorize it as calling frequency.
find out a station at 145.000MHz to start QSO and intend to find other channel not yet occupied. Then you find it at 145.260MHz.
Push Memo switch to memorize 145.260MHz. The displayer shows 145.000MHz recorded previously and then you can call QSY at 145.260MHz for the station now you are in contact. Push the switch again to realize 145.260MHz in the displayer and start QSO.

The above fact means it is quite same with that there are 2 VFO systems selective each other. Memory of frequency is alive for 10 -30 minutes approximately after cutting out power supply. H you set 4 Ni-Cads batteries NR-N or the equivalent in series on the battery box shown above, It is quite possible to keep memory of the selected frequency for a long time.
Frequency synthesizer selector is set at 145.200MHz and push MEMO switch and then this frequency has been memorized.

PO

This is switch to change output power. HI emits IOW and LO emits 1 W.

AGC

AGC time constant require 2 position. SLOW for SSB and FAST for CW. Response of S-meter indication is quick at FAST and SLOW position.

RIT

When you control RIT knob, turn it on and you will see red LED illuminate.

STEP

Frequency steps by SNTHE VFO dial are fixed at lOKHz step/FAST and lKHz step/NORMAL at FM mode. !KHz/FAST and lOOHz/NORMAL for SSB and CW modes. At the time of FM operation, NORMAL step realizes lKHz shift and if you change the switch to position FAST after you set figure in the order of IOKHz.

5KHz STEP

In addition to the above, there are 2 button-switches to shift frequency every 5KHz. On-switching realizes 5KHz and the OFF cancel.

NB

This is noise blanker to kill harmful pulses like ignition noise it works at SSB and CW modes only.

Conditioning of SYNTHE. VFO dial brake

You will find a screw for adjusting sliding brake of the dial inside of bottom cover of the transceiver. This controls rotation speed of SYNTHE. VFO dial shown below.

FDK-Multi-3000-Desktop-VHF-Transceiver-02

OPERATION AND RECEPTION

Terminate antenna to antenna connector at the rear panel. Connect accessory AC cord to terminal plug for power supply.
Turn power switch on to start operation.

Connections on the Rear panel

RECEPTION

FM mode

Set the knob of selector at FM mode.
Turn squelch knob fully clockwise at first. Noise will be heard at the time not receiving input signal and then find the position where the noise is cancelled.
Set AF GAIN knob at suitable position.
For FM operation, it is convenient to change frequency by SYNTHESIZER knobs usually
It covers 800 channels including 5KHz step.
In case of changing frequency very often in succession, set the knob of MHz for SYNTHEZISER at the position of SYNTHE VFO so as to shift frequency by the dial.
Choice position of STEP switch to shift frequency as you need during controlling the dial, namely NORMAL-!KHz step and FAST-l0KHz step.
When you make shift of frequency by NORMAL- I KHz step at first for setting frequency in lKHz every step and then put the switch position to FAST for lOKHz step, frequency reads every l0KHz.
It the step is set at NORMAL in even number at first in the order of l0KHz, frequency varys every Ochs in even m the order of lakh after setting position of STEP switch at FAST.

Center meter indication vs receiving tuning point

Correctly tuned
Other station’s transmitting frequency higher
Other station’s transmitting frequency lower
Turn the RIT knob until the center meter needle be comes to the 0 position.

SSB mode

Set position of MODE selector at USB (USB is accustomed in 2M band operation).
Adjust AF GAIN knob. No function of squelch at SSB mode.
For SSB operation, make in use of SYNTHE VFO dial to shift frequency. Select SYNTHE VFO position. FAST position of STEP switch is for lKHz step and the NORMAL is for l00Hz step.
When you want to shift frequency quickly or to find channel not yet occupied, it is better to slide the dial with FAST position at first and then to tune with NORMAL position precisely.
In order to tune in frequency of input signal, look for point Zero-in where the reproduced voice will be most clear. When starting tuning in the input signal from lower frequency, it begins to reproduce treble sound and you will find position to make clear sound.
This is the point Zero-in for the best tuning. If you turn the dial more to same direction, reproduced voice will be changing like a distorted sound in low range.
When input signal frequency hard to tune in, turn RIT knob on and chase to find the point Zero-in.
If there are pulse noise incoming from ignitor etc., make NB switch on. The noise will be suppressed and it will be possible to clarify input signals in the lowest level.
In case that the input signal is too strong and makes distortion on sound reproduction, reduce gain by adjusting RF GAIN knob.

CW mode

Operation of CW is done in just same manner with SSB operation excepting MODE selector” position.

TRANSMISSION

Select FM’ position of MODE switch.
Set frequency of transmission.
Push microphone PTT switch to emit power.
The meter is now RF meter to indicate output power and it shows some points between 7 and 9 at lows output power.
If indication of the meter is extremely in low level, there will be some trouble in. antenna system.
Adjust modulation with MIC GAIN control.
Turn the knob fully clockwise in FM operation and position of 12 o’clock will be the best for SSB operation.
Save output power and switch to 1 W output at the time of local QSO.

55B mode

Set selector position to USB.
Turn MHz knob of SYNTHESIZER to SYNTHE. VFO. Frequency step should be done at NORMAL of l00Hz at first.
You will be able to change frequency steps f properly after several time of practice.
It is necessary to turn MIC GAIN knob to the position of 12 O’clock. Full turn of the knob will be cause of distortion in modulation.
Select disired frequency by the dial and take note about channel frequencies in the band.
RF meter does not indicate anything during transmission without modulation. ·The meter swing only when the carrier is modulated and intensity of the swing of needle is proportional to loudness of voice accordingly.
No meter indication at SSB operation without modulation of the carrier but in FM operation the meter indicates around number of 7 – 9 always during transmission.
Once starting QSO, do not touch the tuning dial. Chase the input signal by RIT knob when it begin to drift and try to find out the point Zero-in once more.
Utilization of VOX system will bring you comfortable operation for long time QSO.

CW mode

Select position of MODE selector to CW.
Connect key trough jack on rear panel.
Make VOX switch on. The Transceiver is ready for semi break-in operation.
Key operation transmit CW signal immediately. If the operator stop key operation, the transceiver become in the state of reception automatically after a certain delay time.
If it is not necessary to make semi-break-in state, terminate a switch between pin No.4 and No.9 of accessory Socket at rear panel for sending CW signal.
This switch should be made on before starting key operation, otherwise push PTT switch of microphone before key
operation.

PLL Unit

This consists of units L-1, 2, 3, 4, 5, 6, 7, 22, 24 etc. The following is block diagram of PLL section. I-1 is FF unit containing IC oscillator of 10,000MHz and 3 stages · of IC divider to distribute lakh eventually. 1-2 is programmable divider 1/N unit. 3 IC cover full range of frequencies of the transceiver.

PD-VCO Unit

I-3 is PD-VCO unit containing voltage control oscillator.

The output frequency is decided according to 2 factors.
One is phase comparator (P.D) DC output functioned by · difference of a standard signal and the output of 1/N unit and the another is the voltage of P.D through variable capacitance diode.
The output of I-3 becomes local ;dilator signal after passing through Buffer unit I-7. The .frequency of the output is of 127.1MHz for 144.00MHz and of 128.1MHz for 145.00MHz.

VCO MIX Unit

VCO MIX unit is I-6. The function is to supply to mixer multiplied 22.000MHz from 11.000MHz of Total oscillator. A signal 102.100MHz multiplied 9 times from 11.344MHz oscillated in VCO PD unit of 1-5 and the above 22.000MHz are converted to 124.100 MHz in the mixer.
The signal of 124.100MHz is mixed with the output of VCO and converted to signals between 2 and 7 MHz, which are sent to 1/N unit passing through low pass filter.

PLL DIAGRAM

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FUNCTION OF CIRCUIT

UP/DOWN counter

Up/Down counter nit I-22 is consisting of Up/Down counter 2 memory modules of D latch, data selector to select one of 2 memory modules, a part of control circuit, DA converter and controller.
Up/Down counter counts and memorizes number of pulses of clock generator and fixed frequencies by sending pulses to 1/N unit and frequency displayer through data selector.
D latch memorizes content of Up/Down counter at the time of pushing off the MEMO switch. In addition, the content in the D latch memory is also memorized in the Up/Down counter The content of the both unit is exchanged.
DI A circuit provide the output, which controls oscillating frequency (44 X 9 = 102.1MHz) of VCO LO unit.
Steps of frequency at SSB mode is l00Hz or lKHz below l0KHz and also lKHz step at FM mode. For variation of the frequency more than lOKHz, it is necessary to vary 1/N of PLL circuit.
Data selector circuit and controller are specialized to control these circuits.
Another function for setting free offset frequency is included in this unit.

CLOCK Unit

1 rotation of Up/Down counter tuning dial provide 50 pulses with combination of LED and photo-transistors and the pulses are sent to Up/Down counter.

FM Local Unit (I-8)

The unit contains Total oscillator of 16.900MHz necessary for FM transmission and tuning circuit for TX converter.

TX CONVERTER Unit

dual gate MOS-FET in balanced mixer converts IF signal of 16.900MHz and the output of VCO to 144MHz signal. Furthermore, a part of tuning is done by variable capacitance diode and digital signal delivered from PRIORITY unit every 1 MHz is effective for automatic tuning.

BOOSTER Unit (I-10)

This is power amplifier of l0W output. 2 stages of transistors are mounted on a heat sink having adequate heat capacity. APC circuit and voltage control transistors for power switching are also applied on that.

RX Unit 0-11)

RX SSB signal passes through RF amplifier, helical resonator, heterodyne mixer, X’tal filter and reaches to SSB IF unit of 16.9MHz. FM signal passes X’tal filter, narrow band ceramic filter of 455KHz and is detected through limiter for AF amplifier.•
2 stages of noise amplifier and 1 stage of AFB amplifier for squelch present unique and smooth squelch operation. Noise blanker is prepared for SSB mode to suppress various noise pulsations such as ignition noise, thus resulting to clarify input signal in the critical condition for reception.

SSB IF Unit 0-12)

Fundamental circuits for SSB reception are installed in the unit. They are TX-ring modulator, RX-ring detector, AGC circuit, IF stage, AF amplifier and S meter auxiliary circuit.
During SSB proration, the unit generate DSB which becomes SSB signal through high performance 6 elements of X’tal filter. CW carrier is created by unbalanced DC position in ring modulator.

SSB LOCAL Unit (I-13a)

In SSB transmission, this unit acts as carrier generator and as BFO unit of ring detector at SSB reception. Oscillator has 2 X’tals and diodes to select USB, LSB and CW mode respectively.
The frequencies are as follows

AF Unit (I-16)

AF stage adopts powerful IC. CW monitor circuit, CW keying and protection circuit of final RF stage (APC) are installed in the unit.

PRESET INSTRUCTION

MIC AMP Unit (1-17)

This is AF microphone amplifier for FM and SSB operation. composition is preamplifier for both SSB and FM operation.
The signal for FM mode is passing through IC AF amplifier, automatic frequency deviation limiter, spatter filter, integral amplifier and modulated directly with variable capacitance diodes in VCO unit. In SSB operation, the signal is delivered to SSB IF unit through AF amplifier and spatter – filter. CW Semi-break-in circuit and meter auxiliary circuit are also mounted in this unit.

AVR Unit (1-14)

Power source for the transceiver is AC or DC. Bridged rectifier – mounted on heat sink having adequate heat capacity, voltage controlling transistor, 3 terminals voltage regulator, power transformer and their auxiliary circuits collaborate. to supply stabilized DC voltage of 13.8, 8, 5, 7, 6 and 5 volts respectively.

DISPLAY and DISP-DRIVE Units

Display unit (1-20) and display-drive unit (1-21) con sis ts LED and their drivers. Numerical displayer is 7 digit including Lodz display section. There are indicators of TX and RIT in reception.

VOX Unit

IC-1 amplifies microphone input signal, which is detected by D3-4 and sent it to IC-2 for establishing a certain delay time.
TRI-2, VR-1, VR2 and VR3 is composing anti-trip circuit, volume controls of VOX GAIN, ANTI-TRI!? and DELAY respectively.

RECORDER Unit

The unit provides audio output to REC terminal with low impedance.

How to use VOX

When the VOX switch is turned ON, transmission and receiving standby will be automatically changed over by sound without depressing the PTT switch on the microphone. VOX sensitivity can be adjusted by three holes at the bottom side and turning the VOX GAIN knob. Then, in receiving condition, operate VOX and adjust the ANTI-TRIP knob so VOX will not be erratically driven by sounds from the speaker.
If the ANTI -TRIP knob is turned clockwise excessively, the VOX circuit may be driven by noise, etc., making · it impossible for you to proceed to transmission. Exercise care when adjusting this knob. Return time to reception can be adjusted with the DELAY knob.
Pull-out of MIC GAIN knob makes VOX switch on. Adjust VOX sensitivity by VOX GAIN volume. Be very careful so as not to operate the transceiver by reproduced voice of loud speaker. The adjustment of sensitivity is done by ANTI – TRIP volume installed at the bottom of the transceiver.
Delay volume to adjust reset tuning between RX and TX and VOX gain volume are also located there. Take care not to raise sensitivity of VOX so high. Otherwise simple noise is a cause of transmission and the transceiver will not work in reception at all· in this case.
VOX GAIN, ANTI – TRIP and DELAY volumes are conditioned in the factory before delivery.

How to set position A for Free offset

For setting desired repeater offset, set position of SELECTOR at the position A. This position A is also useful to apply transverter model MUV-430A for UHF band operation.
Set the offset frequencies according to the following procedure.

Connects 2 places marked printed circuit board 1-41 by ohm. in top view of resistors look’s
programmable A offset on this board and terminate necessary positions by diodes lS-1555 and lN-60 by means of soldering as shown in the following pattern.
Cut out 2 places marked X in bottom view of printed circuit board 1-41.

TOP view of printed circuit board 1-41

In order fix free offset frequencies, it is necessary to plant 3 jumper wires and to plant diodes to the position as shown in the list of diode position for free offset at position A.
jumper wires located in the center and in the left are permanent wires and the diode planted in 5 points should be 1 S-1555 .
The position of diodes to be attached on the jumper to the position in the list. The diodes to be planted wire in the right side should be changeable according in 2nd and 3rd positions from the top should be lN-60 and others are 1S-1555 .

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