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EL-31

Replacement display kit

for the

YAESU FT-301D

Construction, operational and functional description

SW-Version 2.1b

April 7, 2019

Page 2 / 29 April 7, 2019, © Elcon, Switzerland EL-31_V2.1b_en.docx 
Table of Contents: 
 
1Introduction ..................................................................................................................................... 3 
2Assembly of the display module ..................................................................................................... 3 
1 Parts lists................................................................................................................................ 5 
2 Step by Step assembly and testing of printed circuit boards................................................. 6 
2.1 Assembling the pcb............................................................................................................ 6 
2.2 Initial testing of the board................................................................................................... 7 
3 Start-up and adjustments....................................................................................................... 7 
3.1 Adjustment of the voltage measurement circuit................................................................. 8 
3.2 Adjustment of the frequency measurement circuit............................................................. 8 
4 Conversion of the FT-301D.................................................................................................. 10 
4.1 Removal of the old display board from the FT-301D....................................................... 10 
4.2 Installation of the new display board in the FT-301D ...................................................... 11 
3Operation and functions................................................................................................................ 14 
1 Display.................................................................................................................................. 14 
2 Communication with the display module.............................................................................. 14 
3 Menu structure ..................................................................................................................... 15 
4 Modes................................................................................................................................... 17 
4.1 Frequency Display ........................................................................................................... 17 
4.2 Band modifications (band switch positions 160m, 15m or AUX)..................................... 18 
4.3 Transverter operation (band switch positions 10A to 10D).............................................. 20 
4.4 Transverter and status signaling...................................................................................... 20 
4.5 Voltage Display................................................................................................................ 21 
4.6 Morse readout of frequency............................................................................................. 21 
4.7 Morse readout of voltage ................................................................................................. 22 
4Software Update ........................................................................................................................... 23 
1.1 Installing the USB-updater software on the PC............................................................... 23 
1.2 Installing the USB driver software.................................................................................... 23 
1.3 Transferring the software updates in the EL-31............................................................... 25 
5Appendix....................................................................................................................................... 26 
1 Specifications ....................................................................................................................... 26 
2 Rulers................................................................................................................................... 26 
3 Repair / Warranty ................................................................................................................. 27 
4 PCB assembly...................................................................................................................... 28 
5 Schematics........................................................................................................................... 29 
 
 Important! Advices or tips for the correct function of the EL-31 
 
Caution! The instructions must be observed carefully. 

EL-31_V2.1b_en.docx April 7, 2019, © Elcon, Switzerland Page 3 / 29

1 Introduction

The old YASEU FT-301D shortwave transceiver (first built in the 70s), is still popular, due to

the very good receiver. It was probably one of the first devices that came with a digital fre-

quency display. nfortunately, the display module with LEDs causes big problems. At that time

the 7-segment LED displays were not as efficient as today, and they have a huge power con-

sumption. The resulting heat had the effect that individual segments in the LED displays

failed.

The replacement of the 7-segment displays was still possible some years ago. Today these

components are practically impossible to buy and if so, at exorbitant prices. The replace-

ments fail as well after some use due to overheating.

Today, modern microcontroller-controlled transceivers can be purchased. However, many ra-

dio amateurs are enthusiastic about their old device. However, it’s no fun to use it with a

damaged display.

Therefore, a replacement display module has been developed that is 1:1 compatible with the

old one and includes additional useful functions.

The assembling of the kit is simple, since wired components are used almost exclusively.

2 Assembly of the display module

For the assembly you need the following tools and additional material:

♦50 to 80W pencil-style soldering iron

♦solder Ø 0.5mm flux-core

♦small needle nose pliers

♦several screwdrivers (Phillips)

♦tweezers

♦fine side cutter

♦multi meter (ohmmeter, voltmeter)

It is advisable to study carefully and print out this documentation as a reference when you as-

semble the device. It allows you to control each implemented step.

Make sure the workspace is safe and free of static electricity, so that the installed elements

are not damaged. It might be helpful to wear an antistatic bracelet. The illustrations (Table 3)

on page 6 should help to identify the shapes and colors of the individual components.

The components, pcb and all mechanical elements corresponding to the component list

(Table 2) are packed in a bag. Open the bag carefully, so that no components are lost or

damaged.

Soldering is one of the most important aspects of setting up this device. A bad solder

joint - even with a carefully assembled kit - can make it impossible to operate the unit

and lead to frustration.

Page 4 / 29 April 7, 2019, © Elcon, Switzerland EL-31_V2.1b_en.docx

It's easy to create a good solder joint, if the following rules are observed:

1. Use a temperature-controlled pencil-style soldering iron with about 50 to 80 watts. A 1

to 2 mm wide chisel or pyramid tip works best.

2. Set the temperature for lead-free solder to a maximum of 320°C (608°F) and for

leaded tin to a maximum of 360°C (680°F).

3. The tip must always be clean and well tinned. Wipe the tip often on stainless steel

wool (to be found in the cleaning-products department at a supermarket), never on a

wet sponge. Otherwise the soldering iron tip cools off unnecessarily, and there is not

enough heat at the solder joint.

4. Do not use solder pastes, but good quality solder wire with a flux-core.

5. Keep the soldering iron tip only once, but long enough (approximately 2 to 3 seconds),

to the soldering joint, so that the solder can flow well. During this time enter very little

solder between solder joint and tip.

6. Never touch the soldering pads on the board; otherwise a good soldering will not be

possible. Should this happen anyway, clean the pcb with a lint-free cloth and benzine.

7. For multi-pole components such as IC sockets, plugs, etc. solder only 2 pins on diago-

nally opposite corners. This has the advantage that the elements can still be adjusted

and afterwards soldered definitively. Subsequently, all other connections can be sol-

dered.

Always make sure that you do not burn the already soldered components with the sol-

dering iron.

The resistors in the parts list show the respective color coding (see also Table 1). If you are

not familiar in dealing with the color coding, it is better to measure the resistance value with

an ohmmeter prior to soldering.

Color coding of resistors with 4 rings

Color

Resistance in Ω

Tolerance

1st ring

(1st digit)

2nd ring

(2nd digit)

3rd ring

(multiplier)

4th ring

none

±20%

silver

10-2 = 0.01

±10%

gold

10-1 = 0.1

±5%

black

100= 1

brown

101= 10

±1%

red

102= 100

±2%

orange

103= 1’000

yellow

104= 10’000

green

105= 100’000

±0.5%

blue

106= 1’000’000

±0.25%

violet

107= 10'000’000

±0.1%

gray

108= 100'000’000

white

109= 1'000'000’000

Table 1

EL-31_V2.1b_en.docx April 7, 2019, © Elcon, Switzerland Page 5 / 29

Note: all polarized components (diodes, transistors, capacitors, ICs, relays, etc.) must

have the correct mounting orientation.

2.1 Parts lists

EL-31 board

piece

components No.

Description

R2 (not installed)

22Ω 1/8 W (red-red-black) [Component 1]

R8, R13

100Ω1/8 W (brown- black - brown) [Component 1]

R6, R9, R10

10kΩ 1/8 W (brown -black-orange) [Component 1]

R12

33kΩ1/8 W (orange-orange-orange) [Component 1]

R5, R7

47kΩ 1/8 W (yellow-violet-orange) [Component 1]

R1, R11

100kΩ 1/8 W (brown-black-yellow) [Component 1]

6.5-30pF Trimmer (green) [Component 2]

22pF ceramic, designated 150 [Component 16]

C1, C2, C3, C4, C5, C8, C11

0.1uF ceramic designated 104 [Component 3]

C10

1uF/50V electrolyte [Component 14]

C9, C12

47uF/16V electrolyte [Component 14]

8MHz Crystal HC-49U [Component 4]

U1, U2, U3, U4, U5, U6

LSHD-A103, 7 Segment LED [Component 11]

MAX7221CNG or AS1106PL [Component 8]

PIC18F2550 I/SP programmed [Component 7]

SN7400N Quad NAND [Component 6]

U10

TSOP4838 IR-Rx [Component 12]

AT-1220-TT-5-R Buzzer [Component 13]

P1, P3

1x7 pin header [Component 9]

P4 (already installed)

USB-B mini jack (SMD) [Component 5]

J6 (not installed)

RJ-11 Jack

Jumper on the board (leave open)

Wire length 5cm red [Component 10]

Wire length 30cm white [Component 10]

PCB EL-31

PCB Version 1.0a [Component 15]

Table 2

Component 1

Component 2

Component 3

Component 4

Component 5

Component 6

Component 7

Component 8

Component 9

Component 10

Page 6 / 29 April 7, 2019, © Elcon, Switzerland EL-31_V2.1b_en.docx

Component 11

Component 12

Component 13

Component 14

Component 15

Component 16

Component 17

Component 18

Component 19

Component 20

Table 3

2.2 Step by Step assembly and testing of printed circuit boards

2.2.1 Assembling the pcb

For the placement drawings of the top and bottom of the pcb refer to Chapter 5.3 (Figure 20

and Figure 21). The SMD components are already assembled.

Populate the following components, using the parts list (Table 2).

R1 to R13, resistors

X1, Crystal 8MHz →The crystal is soldered with a small distance to the circuit board:

Cut a paper or a plastic strip 4mm x 30mm (thickness approx. 0.2mm) and place it on

the component side between the two quartz ports. After soldering, remove the strip.

C1 to 12, capacitors →mind the polarity in electrolytic capacitors!

U1 to U6, 7-segment LED display 10 pin→note installation direction!

U7, IC MAX7221 or AS1106 LED Display-Driver 24 pin →note installation direction!

The LEDs must be very accurately aligned in a straight line! Solder only 2 pins (diago-

nal) first, so that the alignment can still be corrected.

U8, IC PIC18F2550 microcontroller →note the installation direction!

U9, IC SN7400N Quad 2-Port NAND →note the installation direction!

U10, IC TSOP4838 IR Receiver →leads have to be turned by 90°.

B1, AT-1220-TT-5-R Buzzer

P1 and P3, pin connectors 2x7

The pin connectors are fitted on the backside and soldered on the front side. The pin

strips must lie flat and stay perpendicular to the pcb.

J2, Solder the 30 cm long white wire →This wire will be connected to the 13.8V supply

voltage of the transceiver after installation of the display board into the FT-301D.

EL-31_V2.1b_en.docx April 7, 2019, © Elcon, Switzerland Page 7 / 29

J3, Solder the 5 cm long red wire →this wire will be connected to the resistor R15

(3.3kΩ) after installation of the pcb into the FT301D (see 2.4.1 Removal of the old display

board from the FT-301D).

Check all solder joints very accurately!

A magnifying glass may be helpful, because even the smallest, unwanted solder

bridges can prove disastrous impact to the function.

2.2.2 Initial testing of the board

If all elements are fitted, a first electrical test can be followed.

Note: Keep your workspace clean so that the pcb is not laying on cut pieces of wires

which can lead to short circuits.

Plug in a 5V-power supply to the connector P3 (pin 1 is the +pole, pin 2 the -pole).

If you have a power supply with current limit set it to a maximum current of about

40mA.

Turn on the power supply.

The following text will appear on the 7-segment display :

.   followed by the Morse code "R" ( di-dah-dit)

Subsequently the display is in the frequency measurement mode. If on P3 Pin 5 no RF-

signal is present, the display will show ...

If the first test is successful, you can do the adjustment procedures for voltage and fre-

quency.

2.3 Start-up and adjustments

For the calibration procedure, you need the following measurement instruments:

♦Digital voltmeter for the range DC 0 to 20V (resolution 10mV)

♦An additional (auxiliary) power supply, adjustable between DC 5 to 20V, minimal current

2mA

♦PHILIPS or universal IR-remote control, set to the RC5 TV mode.

♦A frequency counter with a range up to 15MHz and a resolution of 1Hz.

♦A RF-signal generator in the frequency range 10 to 20MHz, in which the output signal can

be set to about 0dBm (1mW, 223mV).

With the built-in calibration routines, the display board can be easily calibrated for all operat-

ing modes.

For example, if you set and save incorrect values in the voltage calibration procedure,

the meter will indicate wrong values. But you can repeat the calibration procedures as

many times as you want, until you get the correct result.

Page 8 / 29 April 7, 2019, © Elcon, Switzerland EL-31_V2.1b_en.docx

2.3.1 Adjustment of the voltage measurement circuit

Plug in a 5V-power supply to the connector P3 (pin 1 is +pole, pin 2 is -pole).

If you own a power supply with current limit, set it to a maximum current of about

40mA.

Connect the auxiliary power supply to the GND (-) and the white wire (+), connected to J2

on the display board.

Set the voltage of the auxiliary power supply exactly on 13V. Measure the voltage with the

voltmeter.

Turn on the 5V power supply to power the display board.

If the display shows .. select, the  „Setup“-Mode, by pressing the VOL+

or VOL- button on the remote control.

Press the numeric key no 4 on the remote control.  „Calibrate V“ will be dis-

played.

Using the VOL+ or VOL- key to calibrate the display to exactly . Volt.

Press again the numeric key no 4 on the remote control. You are now back to the

 mode, and the calibration value is stored in the memory of the microcontroller.

Select the display . volts by using the VOL+ or VOL- key.

Increase the voltage on the auxiliary power supply to e.g. 15.7V (see Voltmeter) and the

display should now show . volts.

The adjustment is completed. Turn off the auxiliary and the 5V power supply.

2.3.2 Adjustment of the frequency measurement circuit

For the following adjustments you should use an RF signal generator with a precise fre-

quency from 10 to 15MHz at a level of about 0dBm (220mV). The frequency of the cali-

bration is not as essential as is the precision with which the alignment can be imple-

mented. This requires an accurate frequency counter (<1Hz accurate).

If your RF signal generator has a TTL-level output, the auxiliary interface circuit is not

needed.

You can connect the signal generator directly to the EL-31 P3 / Pin 3.

For the injection of a sinusoidal test frequency an auxiliary circuit is required. This auxil-

iary circuit is available in the transceiver FT-301D, but it is needed to carry out the fre-

quency alignment on the not built-in display board.

Figure 1

Plug in a 5V-power supply to the connector P3 (pin 1 is +pole, pin 2 is -pole).

If you own a power supply with current limit, set it to a maximum current of about

40mA.

Connect the frequency counter to the RF signal generator so that you can always meas-

ure the exact frequency.

Connect the input of the auxiliary circuit to the signal generator. Connect the output of the

auxiliary circuit with P3 / Pin 3 of the display board.

Turn on the 5V power supply to power the display board.

If the display shows .. select the  „Setup“-Mode by pressing the VOL+

or VOL- button on the remote control.

Press the numeric key no 3on the remote control.  „Automatic Frequency Display

Mode“ is displayed.

Using the VOL+ or VOL- buttons the  „10Hz-Frequency Display Mode“, the fre-

quency is always displayed in the 10Hz-resolution without the MHz digits.

Press the numeric key no 3on the remote control again. You are now back in the 

mode.

Press the VOL+ or VOL- key until .. is displayed.

Turn on the signal generator and set a frequency, for example 13.000.000 MHz at a level

of about 0dBm.

Change the trim potentiometer at the auxiliary circuit to a stable frequency reading on the

display unit, for example .. (last digit = 10Hz).

Set the frequency with a non-conductive screwdriver on the trimming capacitor C7 exactly

to the frequency that you are reading on the frequency counter.

e.g. .. if accurate 13.000.000 MHz is measured.

Use the remote control by pressing the VOL+ or VOL- key to select the  „Setup“

mode.

Press the numeric key no 3on the remote control. You see .

Change with the VOL+ or VOL- key to the  mode.

Press the numeric key no 3on the remote control again. You see .

Press the VOL+ or VOL- key until the display shows .. (last digit = 100Hz).

The adjustment is completed. The auxiliary circuit can be disconnected from the display

board and the power can be switched off.

2.4 Conversion of the FT-301D

2.4.1 Removal of the old display board from the FT-301D

To prevent problems the mechanical assembly has to be done strictly according to the

following order:

Remove the cover of the device, which is secured by four plastic tabs.

Disconnect the cable from the speaker terminal.

Place the unit upside down and remove the 12 screws and the bottom cover.

Carefully pull off the two header connectors from the display board.

Figure 2

With a side cutter cut the wire of the 3.3kΩ resistor to the terminal connector on the side it

is soldered to the display board. The resistor will be reconnected after installation of the

new display board into the FT-301D.

Turn the device over again, so that the top is facing up.

Remove the large frequency setting knob on the front panel by loosening the two grub

screws.

Remove the mounting screw behind the frequency setting knob (see Figure 3).

Figure 3

Loosen the two screws securing the display device holder on top (do not remove entirely).

Figure 4

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