EA3GCY ILER-40MK2 User manual

ILER-40 MK2 SSB QRP Transceiver Kit Page 1
ILER-40 MK2
QRP SSB Transceiver Kit
Assembly manual
Version 2, last update: June, 2017
Translated by Marlin, KC0O
[email protected]
Most recent updates and news at:www.qsl.net/ea3gcy
Thanks for constructing the ILER-20 MK2 SSB Transceiver kit
Have fun assembling it and enjoy QRP! 73 Javier Solans, ea3gcy

ILER-40 MK2 SSB QRP Transceiver Kit Page 2
INDEX
INDEX ................................................................................................................................... 2
INTRODUCTION ................................................................................................................... 3
SPECIFICATIONS ................................................................................................................ 4
TIPS FOR FIRST TIME BUILDERS ..................................................................................... 5
PARTS LIST SORTED BY VALUE/QUANTITY .................................................................. 7
INDIVIDUAL PARTS LIST.................................................................................................... 9
120-QUADRANT COMPONENT LAYOUT MAP ................................................................. 13
ASSEMBLY ......................................................................................................................... 14
ADJUSTMENT AND TESTING ........................................................................................... 27
IF YOUR KIT DOES NOT WORK AFTER FINISHING ASSEMBLY .................................. 32
LIMITED WARRANTY ......................................................................................................... 34
SCHEMATIC ........................................................................................................................ 35
WIRING ................................................................................................................................ 36

ILER-40 MK2 SSB QRP Transceiver Kit Page 3
INTRODUCTION
What is the significance of ILER? A
little bit history…
The origin of LLEIDA goes back to 5th
century B.C. when the Iberian people of
the ILERGETAS settled on top of the
"Cerro de la Seu Vella" (Hill of the Old
See) and founded the city of ILTIRDA.
Their most well-known leaders were
Indibil and Mandonio, who defended
against the Carthaginians and Romans,
but were defeated in the year 205 B.C.,
and thereafter the city was Romanized
and renamed ILERDA.
LLEIDA is the current name of this city
in the northeast of Spain.
Photo: Seu Vella de Lleida.
ILER-40 MK2
The circuit of the ILER kits is a Spanish redesign of the 80 meter transceiver “Antek” by Andy SP5AHT,
published in the magazine “Swiat Radio.” By switching the LO and the BFO between the two NE602's,
each one carries out two different functions determined by TX or RX mode. One NE602 functions as a
receive mixer and a DSB generator, and the other NE602 functions as a transmit mixer and a SSB
demodulator.
A quartz crystal controlled local oscillator (LO) tunes a segment with a range of 25-100 KHz.
The optional “ILER-DDS” kit makes it possible to cover the entire band.
The transmitter has a robust design to withstand and work hard in the field!
The philosophy of this transceiver is:
"Put in just the minimum that it needs to work, and work well!"
There are only two controls: volume and tuning, which are sufficient for enjoying the pleasure of QRP!

ILER-40 MK2 SSB QRP Transceiver Kit Page 4
Acknowledgments
To Andy, SP5AHT, for his important contribution to the world of amateur radio.
To Jon Iza, EA3SN, for his educational articles and contribution to technical data.
To Luis EA3WX, Juan EA3FXF, Jaime EA3HFO, Alfonso EA3BFL and to J. Antonio Beltrán for the help
they gave in making this kit a reality, from the first prototype to the current ILER-17.
To “eaqrpclub.com” for keeping the "tinkering" flame burning even during difficult times.
SPECIFICATIONS
GENERAL:
Frequency coverage: VXO that tunes a 30 to 100 KHz segment of the 40M band (recommended 50-
60KHz max. to obtain reasonable stability). The range of coverage is selected by means of the value of
L6 in the VXO circuit.
Frequency control: Quartz crystal controlled oscillator (VXO).
Option A: a pair of 12.031MHz crystals. (upper limit approx. 7.105MHz)
Option B: one 12.096MHz crystal. (upper limit approx. 7.185MHz)
Variable tuning capacitor (polyvaricon).
Antenna: 50 ohms.
Power supply: 12-14VDC, 35mA in receive (without signal), 1000-1100mA in transmit.
Components: 65 resistors, 83 capacitors, 3 variable resistors, 1 trimmer capacitor, 1 potentiometer
(volume), 8 IC's, 14 transistors, 12 inductors-chokes, 6 RF transformers, 1 variable tuning capacitor, 6
crystals.
Front panel controls: tuning, volume.
Optional controls: RX attenuator potentiometer, RX attenuator switch.
External connections: mic/ptt, speaker jack, antenna, DC input.
Circuit board dimensions: 100x120 mm.
TRANSMITTER:
RF output: 4-5 W (12-14V)
Second harmonic output: -42dB below the fundamental frequency.
Other spurious signals: all signals -50dB or better below the fundamental frequency.
Carrier suppression: better than -45dB.
T/R switching: Relays.
Microphone preamp with bandpass.
Microphone: dynamic, approx. 600 ohms, CB type or similar (not included).
RECEIVER:
Type: Superheterodyne, balanced mixer.
Sensitivity: 0.250uV minimum discernible signal.
Selectivity: 4-pole crystal ladder filter, 2.2 KHz nominal bandwidth.
IF Frequency: 4.915 MHz.
Built-in audio preamp and AGC.
Audio output: 250mW @ 8 Ohms.

ILER-40 MK2 SSB QRP Transceiver Kit Page 5
PLEASE READ ALL OF THE ASSEMBLY
INSTRUCTIONS COMPLETELY AT LEAST ONCE
BEFORE BEGINNING.
TIPS FOR FIRST TIME BUILDERS
Tools required:
- A 15-30w soldering iron with fine tip, small wire cutters for cutting component leads, wire strippers,
long-nose pliers, needle-nose pliers, X-Acto knife, screwdriver for M3 screws, alignment tool for
adjusting IF transformers.
- You will need a good light and a magnifying glass to see the fine print on the components and other
assembly details.
Instruments required:
- Multimeter, oscilloscope (desirable but not essential), frequency counter or HF receiver, RF power
meter, dummy load: 5W - 50 Ohms, RF generator (desirable but not essential).
Soldering:
There are two important things which need to be done to insure successful operation of a kit. The first is
to put the component into the proper place on the circuit board; the second is good soldering.
To solder properly, you must use a high-quality solder for electronics use and the correct type of iron.
Use a small soldering iron with a fine, pointed tip. The soldering iron should be about 15-30 watts (if it is
not thermostatically controlled). Use only high-quality electronic type solder. NEVER use any extra flux.
You should hold the hot soldering iron in contact with both the circuit board and the component lead for
about two seconds to heat them up. Then, keeping the soldering iron in place, touch the solder at the
junction of the lead and trace and wait about two seconds or so until the solder flows between the
terminal and the trace to form a good joint. Now remove the soldering iron. The soldering iron should
have been in contact with the work piece for a total time of about 4 seconds. After soldering each joint,
you should clean the soldering tip, removing any excess solder. This prevents mixing in old solder and
residues from previous soldering operations.

ILER-40 MK2 SSB QRP Transceiver Kit Page 6
Finding the correct component:
IC's
The component outline for the IC printed on the circuit board has a “U” shaped notch on one end,
indicating the end at which pin 1 of the IC is located. There is a similar notch on one end of the IC socket
that should be oriented over the “U” printed on the circuit board. Finally, pin 1 of the IC is also marked
with a small dimple or dot; this end of the IC should be oriented towards the notch in the IC socket or the
"U" of the component outline.
Diodes
Be careful to observe the correct polarity of the diodes. There is a black band towards one end of the
diode. This band should be oriented towards the line printed on the component outline of the circuit
board.
Electrolytic capacitors:
These must be placed with the correct polarity. The positive lead (+) is always the long lead. The
negative terminal (-) is the short lead and is marked by a stripe on the body of the capacitor. Make sure
that the positive lead of the capacitor goes through the hole marked with a "+" on the circuit board.
Coils and transformers:
You may find it convenient to wind and prepare all the coils and transformers before beginning to mount
the components. That way you won't have to stop and possibly lose concentration while winding them.
This is the part of the construction that some consider to be the most difficult. I personally find it to be
one of the easiest stages, and it can even be relaxing. Look for the most appropriate moment to do it,
and most importantly, take your time. The drawings and instructions in the manual will illustrate and
accompany you in the process.

ILER-40 MK2 SSB QRP Transceiver Kit Page 7
PARTS LIST SORTED BY VALUE/QUANTITY
Resistor list
Qty
Value
Checked
Ref.
Identified
5
1
R33, R51, R57, R60, R61
brown-black-gold
1
10
R1
brown-black-black
2
22
R15, R56
red-red-black
4
100
R13, R39, R50, R52
brown-black-brown
1
270
R58
red-violet-brown
2
470
R46, R54
yellow-violet-brown
13
1K
R2, R7, R10, R16, R30, R38, R42, R47, R53, R59, R62, R63
brown-black-red
1
1K2
R45
brown-red-red
1
1K5
R32
brown-green-red
4
4K7
R4, R25, R48, R55
yellow-violet-red
9
10K
R3, R5, R11, R12, R14, R22, R31, R34, R35
brown-black-orange
7
22K
R27, R36, R37, R40, R41, R43, R44
red-red-orange
1
33K
R26
orange-orange-orange
3
47K
R21, R28, R29
yellow-violet-orange
2
56K
R8, R9
green-blue-orange
1
100K
R6
brown-black-yellow
1
150K
R18
brown-green-yellow
1
220K
R20
red-red-yellow
1
270K
R24
red-violet-yellow
2
470K
R17, R19
yellow-violet-yellow
1
1M
R23
brown-black-green
1
1K
P1 RX-gain pot. w/shaft (optional no included)
1K lin.
1
10K
P4 Volume control pot. w/shaft
10K
2
5K
P2, P3 ajustable trimmer
502 or 53E
1
500
P5 ajustable trimmer
501 or 52Y
R64 is 1K (brown-black-red) if Q14 = 2SC1969 or 3K3 (orange-orange-red) if Q14 = 2SC2078 (see bag 9)
Capacitor list
Qty
Value
Checked
Ref.
Identified
35
100n
C1, C2, C3, C9, C12, C14, C15, C22, C23, C24, C28, C29, C31, C32
104 or 0.1
C33, C39, C43,C44, C48, C50, C51, C56, C59, C60, C64, C65, C67,
C70, C71, C72, C73, C75, C77, C78, C82
5
10n
C26, C40, C68, C69, C76
103 or 0.01
5
1n
C34, C47, C55, C57, C66
102 or 0.001
1
1n
C80 Polystyrene
1000
2
470p
C79, C81 Polystyrene
470
1
330p
C10
n33 or 331
4
220p
C16, C27, C45, C46
n22 or 221
2
100p
C52, C53
101
4
82p
C4, C6, C61, C63
82P
1
47p
C54
47P
5
33p
C17, C18, C19, C20, C21
33P or 33J
1
27p
C7
27P or 27J
1
12p
C83
12P or 12J
2
8p2
C5, C62
8P2
1
220uf
C36 (elec.)
220uf 25v or 35V
5
100uf
C25, C30, C35, C41, C42 (elec.)
100uf 25V or 35V
6
10uf
C8, C11, C37, C38, C49, C74, (elec.)
10uf 25V or 35V
1
1uf
C13 (elec.)
1uf 25V, 35V or 63V
1
60p
CV1 Murata trimer BFO
Brown
1
160p
CV2+CV3 Polyvaricon dual gang. Tuning. 160p + 70p
70p

ILER-40 MK2 SSB QRP Transceiver Kit Page 8
Semiconductors list
Qty
Type
Checked
Ref.
Identified
Transistors
11
BC547
Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11
BC547
1
2N2222
Q12
2N2222
1
2N5109
Q13
2N5109
1
2SC1969/2078
Q14 2SC1969 or 2SC2078, washer + mica spacer
C1969 or C2078
Integrated circuits
1
LM741
IC1
LM741CN or UA741
2
SA/NE602
IC2, IC3
SA602AN or NE602AN
1
LM386
IC4
LM386N-1
1
78L05
IC8
MC78L05
1
78L06
IC5
MC78L06
2
78L08
IC6, IC7
MC78L08
Diodes
5
1N4148
D1, D2, D3, D4, D5
4148
2
1N4001(7)
D6, D7
1N4001 or 1N4007
1
47V
D8, Zener 47V 1W
BZX85C47
1
LED
D9, bicolor Led
-
Inductors/RF Transformers list/Crystals/Relays
Qty
Value
Checked
Ref.
Identified
6
100uH
L1, L2, L3, L5, L7, L9 Axial inductor
brown, black, brown
1
39uH
L4 Axial inductor
orange, white, black
2
VK200
L8, L10
Choque
2
T37-2
L11, L12 LPF toroids
9.5 mm diam. Red
1
T68-2
L6 Toroid. Tuning inductor
18 mm diam. Red
4
5u3H (3334)
T1, T2, T3, T4 coils 5u3H
5u3H
2
FT37-43
T6 toroid 8t+8t ; T5 toroid 10t - 3t
9.5 mm diam. Black
5
4.915
X1, X2, X3, X4, X5 Crystals 4.915MHz.
4.915
2/1
12.031/ 12.096
X6, X7 12.031MHz crystals or X7 12.096MHz X6 none
12.031 or 12.096
2
Relays
RL1, RL2
-
Hardware
Qty
Value
Checked
Ref.
Identified
5
nuts
hex nuts M3
-
4
spacers
5mm spacer for M3 screw
-
4
screw
5mm M3 screw
-
1
screw
10mm M3 screw
-
2
screw
4mm M2,5 screw (for Polyvaricon)
1
screw
12mm M2,5 screw (for Polyvaricon )
1
washer
M3 lock washer
-
29
pins
Mic, 12V, ATT, P1-RXG, ANT, ALT, D7, VXO, BFO, J1, J2, K1, K2, S
-
3
jumper
jumpers for J1, J2 and P1RXG
-
4
IC socket
IC’s socket 8 pin
-
1
Shaft Poly.
6mm Shaft Polyvaricon Hardware
-
1
Heatsink
Q14 (Output Amp) Heatsink
-
1
Heatsink
Q13 (Driver) Heatsink small
110cm
wire
110cm enameled copper wire 0,5mm
-
115cm
wire
100cm enameled copper wire 0,3mm
-
1
ILER MK2 PCB
100mm x 120mm ILER MK2 PCB
-

ILER-40 MK2 SSB QRP Transceiver Kit Page 9
LIST OF INDIVIDUAL COMPONENTS
Resistors
Checked
Ref.
Value
Ident./Comment
Circuit section
Located
R1
10
brown-black-black
RX att.
B-10
R2
1K
brown-black-red
RX att.
C-10
R3
10K
brown-black-orange
Mic. Preamp
F-9
R4
4K7
yellow-violet-red
Mic. Preamp
E-9
R5
10K
brown-black-orange
Mic. Preamp
F-9
R6
100K
brown-black-yellow
Mic. Preamp
F-8
R7
1K
brown-black-red
Mic. Preamp
G-7
R8
56K
green-blue-orange
DSB gen/RX mix
F-6
R9
56K
green-blue-orange
DSB gen/RX mix
F-5
R10
1K
brown-black-red
Carrier ctrl.
E-5
R11
10K
brown-black-orange
Carrier ctrl.
D-6
R12
10K
brown-black-orange
Carrier ctrl.
D-5
R13
100
brown-black-brown
Mic.Preamp
F-8
R14
10K
brown-black-orange
RX RF mute
D-7/8
R15
22
red-red-black
Dem/Gen supply
G-3/4
R16
1K
brown-black-red
AGC input
G-7
R17
470K
yellow-violet-yellow
Audio AGC-preamp
H-9
R18
150K
brown-green-yellow
Audio AGC-preamp
H-8
R19
470K
yellow-violet-yellow
Audio AGC-preamp
G-9
R20
220K
red-red-yellow
Audio AGC-preamp
G-8
R21
47K
yellow-violet-orange
Audio AGC-preamp
G-9
R22
10K
brown-black-orange
Audio AGC-preamp
H-10
R23
1M
brown-black-green
Audio AGC-preamp
H-9
R24
270K
red-violet-yellow
Audio AGC-preamp
H-8
R25
4K7
yellow-violet-red
Audio AGC-preamp
H-10
R26
33K
orange-orange-orange
Audio AGC-preamp
H-9/10
R27
22K
red-red-orange
Audio AGC-preamp
I-9/10
R28
47K
yellow-violet-orange
Audio AGC-preamp
I-8
R29
47K
yellow-violet-orange
Audio AGC-preamp
J-8
R30
1K
brown-black-red
Audio Amp mute
J-9
R31
10K
brown-black-orange
Audio Amp mute
L-7/8
R32
1K5
brown-green-red
Audio Amp mute
L-6
R33
1
brown-black-gold
Audio Amp Out.
K/L-9
R34
10K
brown-black-orange
BFO offset
L-5
R35
10K
brown-black-orange
BFO offset
L-5
R36
22K
red-red-orange
BFO
J-7
R37
22K
red-red-orange
BFO
J-6
R38
1K
brown-black-red
BFO
I-6/7
R39
100
brown-black-brown
BFO
I-6
R40
22K
red-red-orange
VXO
I-3
R41
22K
red-red-orange
VXO
J-4/5
R42
1K
brown-black-red
VXO
J-4/5
R43
22K
red-red-orange
VXO
I-2
R44
22K
red-red-orange
VXO
I-4
R45
1K2
brown-red-red
VXO
I-4
R46
470
yellow-violet-brown
VXO
I-4/5
R47
1K
brown-black-red
TX Pre-driver
G-2
R48
4K7
yellow-violet-red
TX Pre-driver
H-2
R49
--
NO USED
TX Pre-driver
I-1
R50
100
brown-black-brown
TX Pre-driver
I-1
R51
1
brown-black-gold
TX Pre-driver
F-1
R52
100
brown-black-brown
TX Driver
E/F-3
R53
1K
brown-black-red
TX Driver
E/F-2
R54
470
yellow-violet-brown
TX Driver
D-2
R55
4K7
yellow-violet-red
TX Driver
D-2

ILER-40 MK2 SSB QRP Transceiver Kit Page 10
R56
22
red-red-black
TX Driver
C-1
R57
1
brown-black-gold
TX Driver
B-1
R58
270
(BIAS) red-violet-brown
BIAS TX Out Amp
C-3/4
R59
1K
brown-black-red
TX Out Amp
A-3
R60
1
brown-black-gold
TX Out Amp
B-1/2
R61
1
brown-black-gold
TX Out Amp
A-1/2
R62
1K
brown-black-red
Bi-color LED
K-6
R63
1K
brown-black-red
Bi-color LED
L-6
R64
1K
If Q14 = 2SC1969 brown-black-red
TX Pre-driver
G-2
3K3
If Q14 = 2SC2078 orange-orange-red
TX Pre-driver
G-2
R65
--
NO USED
TX Pre-driver
F-2
P1
1K
RX-GAIN Pot. w/shaft optional
Rx-Gain Control
A-9
P2
5K
502 or 53E trimmer
Mic preamp
F-10
P3
5K
502 or 53E trimmer
DSB gen / Rx mix
F-5
P4
10K
VOLUME pot. w/shaft 10K
Audio Amp volume
L-8/9
P5
500
501 or 52Y trimmer
“Bias” out amp
C-4
Capacitors
Checked
Ref.
Value
Ident./Comment
Circuit section
Located
C1
100n
104 or 0.1
RX input
A-8
C2
100n
104 or 0.1
RX input
A-8
C3
100n
104 or 0.1
RX att
C-10
C4
82p
82P
BPF RX
C-9
C5
8p2
8P2
BPF RX
C-8
C6
82p
82P
BPF RX
C-9
C7
27p
27p or 27J
DSB gen/RX mix
E-7/8
C8
10uF
10uf 25V or 35V (elec)
Mic preamp
E-10
C9
100n
104 or 0.1
Mic preamp
E-10
C10
330p
n33 or 331
Mic preamp
E-8
C11
10uF
10uf 25V or 35V (elec)
Mic preamp
F-9
C12
100n
104 or 0.1
Mic preamp
F-8
C13
1uF
1uF 25V, 35V or 63V (elec)
DSB gen/RX mix
G-6/7
C14
100n
104 or 0.1
Carrier ctrl.
D-5
C15
100n
104 or 0.1
DSB gen/RX mix
F-6
C16
220p
n22 or 221
DSB gen/RX mix
H-6
C17
33p
33p or 33J
FI xtal filter
F-7
C18
33p
33p or 33J
FI xtal filter
E-6
C19
33p
33p or 33J
FI xtal filter
E-5
C20
33p
33p or 33J
FI xtal filter
E-4/5
C21
33p
33p or 33J
FI xtal filter
E/F-4
C22
100n
104 or 0.1
SSB dem/TX mix
E-3
C23
100n
104 or 0.1
IC2-IC3 supply
H-3
C24
100n
104 or 0.1
IC2-IC3 supply
G-5
C25
100uF
100uF 25V or 35V (elec)
C3 supply
F-4
C26
10n
103 or 0.01
IC3 supply
H-4
C27
220p
n22 or 221
SSB dem/TX mix
H-5
C28
100n
104 or 0.1
Audio AGC-preamp
G-8
C29
100n
104 or 0.1
Audio AGC-preamp
G-8
C30
100uF
100uF 25V or 35V (elec)
Audio AGC-preamp
G-9
C31
100n
104 or 0.1
Audio AGC-preamp
H-9/10
C32
100n
104 or 0.1
Audio AGC-preamp
I-9
C33
100n
104 or 0.1
Audio AGC-preamp
I/J-9
C34
1n
102 or 0.001
Audio AGC-preamp
I-8
C35
100uF
100uF 25V or 35V (elec)
Audio AGC-preamp
I/J-10
C36
220uF
220uF 25V or 35V (elec)
VCC supply
H-7
C37
10uF
10uF 25V or 35V (elec)
Audio Amp out.
J-10
C38
10uF
10uF 25V or 35V (elec)
Audio Amp out.
J-9
C39
100n
104 or 0.1
Audio Amp out.
K-8
C40
10n
103 or 0.01
Audio Amp out.
L-9/10
C41
100uF
100uf 25V or 35V (elec)
Audio Amp mute
L-7
C42
100uF
100uF 25V or 35V (elec)
Audio Amp out.
K-10
C43
100n
104 or 0.1
Audio Amp out.
K-8

ILER-40 MK2 SSB QRP Transceiver Kit Page 11
Crystals
Cheked
Ref.
Frequency
Ident./Comment
Circuit section
Located
X1
4.915MHz
I.F.
E-7
X2
4.915MHz
I.F.
E-6
X3
4.915MHz
I.F.
E-5
X4
4.915MHz
I.F.
E-4
X5
4.915MHz
BFO
J/K-6
X6
12.031MHz or none
VXO
J-3
X7
12.031MHz or 12.096MHz
VXO
I-3
Semiconductors
Cheked
Ref.
Type
Ident./Comment
Circuit section
Located
Transistors
Q1
BC547
BC547
RX RF mute
C-8
Q2
BC547
BC547
Carrier switch
D-6
Q3
BC547
BC547
Audio AGC preamp
H-9
Q4
BC547
BC547
Audio AGC preamp
H-8
C44
100n
104 or 0.1
BFO offset
L-4
C45
220p
n22 or 221
BFO
I-7
C46
220p
n22or 221
BFO
J-6
C47
1n
102 or 0.001
BFO
I-7
C48
100n
104 or 0.1
BFO
J-7
C49
10uF
10uF 25V or 35V (elec)
BFO/VXO supply
K-7
C50
100n
104 or 0.1
BFO/VXO supply
I-8
C51
100n
104 or 0.1
VXO
K-3/4
C52
100p
n10 or 101
VXO
K-4/5
C53
100p
n10 or 101
VXO
J-4/5
C54
47p
47p or 47J
VXO
J-4/5
C55
1n
102 or 0.001
VXO
H-4
C56
100n
104 or 0.1
VXO
K-4/5
C57
1n
102 or 0.001
TX Pre driver input
G-3
C58
--
NO USED
TX Pre-driver
I-1/2
C59
100n
104 or 0.1
TX supply
C-5
C60
100n
104 or 0.1
TX Pre-driver
F-1
C61
82p
82p or 82J
TX Pre-driver BPF
H-1
C62
8p2
8p2 or 8.2
TX Pre-driver BPF
G-2
C63
82p
82p or 82J
TX Pre-driver BPF
F-1
C64
100n
104 or 0.1
TX Driver
E-3
C65
100n
104 or 0.1
TX Driver
E/F-2
C66
1n
102 or 0.001
TX Driver
D-1
C67
100n
104 or 0.1
BIAS supply
D-4
C68
10n
103 or 0.01
TX Driver
B-1
C69
10n
103 or 0.01
TX Driver
C-2
C70
100n
104 or 0.1
TX Driver supply
C-2/3
C71
100n
104 or 0.1
TX Driver supply
E-3
C72
100n
104 or 0.1
BIAS supply
C-3
C73
100n
104 or 0.1
TX Out Amp supply
C-5
C74
10uF
10uF 25V or 35V (elec)
TX Out Amp supply
C/D-6
C75
100n
104 or 0.1
TX Out Amp
B-2/3
C76
10n
103 or 0.01
TX Out Amp
B-3/4
C77
100n
104 or 0.1
TX Out Amp supply
B-4
C78
100n
104 or 0.1
TX Out Amp
A-5
C79
470p
470 (polystyrene)
LPF
A-6
C80
1000p
1000 (polystyrene)
LPF
B-6
C81
470p
470 (polystyrene)
LPF
C-6
C82
100n
104 or 0.1
PTT
G-6
C83
12p
12p or 12J
Offset BFO
K-6
CV1
60p
Trimmer (brown)
BFO
J-5
CV2 + CV3
Polyvaricon (tuning control)
VXO Tuning
L-2/3/4

ILER-40 MK2 SSB QRP Transceiver Kit Page 12
Q5
BC547
BC547
Audio AGC preamp
I-9
Q6
BC547
BC547
Audio AGC preamp
I-10
Q7
BC547
BC547
Audio amp mute
L-7
Q8
BC547
BC547 (option)
BFO offset switch
K-5
Q9
BC547
BC547
BFO
J-7
Q10
BC547
BC547
VXO
J-4
Q11
BC547
BC547
VXO
I-4
Q12
2N2222A
2N2222A
TX Pre driver
I-1/2
Q13
2N5109
2N5109
TX Driver
C/D-1
Q14
2SC1969/2078
2SC1969 or 2SC2078
TX Out Amp
A-2/3
IC's
IC1
LM741
LM741CN or UA741
Mic preamp
F-8/9
IC2
SA/NE602
SA602AN or NE602AN
DSB gen/Rx mix
F-6/7
IC3
SA/NE602
SA602AN or NE602AN
SSB Dem/Tx mix
F-3/4
IC4
LM386
LM386N-1
Audio Amp
J/K-9
IC5
78L06
MC78L06
Dem/Gen supply
H-3/4
IC6
78L08
MC78L08
BFO/VXO supply
H-8
IC7
78L08
MC78L08
bias Driver
E-4
IC8
78L05
MC78L05
BIAS Output Amp
D-3
Inductors/RF Transformers
Checked
Ref.
Value/Type
Ident./Comment
Circuit section
Located
L1
Axial 100uH
brown, black, brown
Rx attenuator
B-10
L2
Axial 100uH
brown, black, brown
DSB gen/Rx mix
G/H-4
L3
Axial 100uH
brown, black, brown
SSB Dem/Tx mix
G/H-3
L4
Axial 39uH
orange, white, black
BFO
K-5
L5
Axial 100uH
brown, black, brown
BFO
I-7
L6
T68-2
Turns = see text
VXO
J/K-1/2
L7
Axial 100uH
brown, black, brown
VXO
K-4
L8
VK200
ferrite wound
Driver
D-3
L9
Axial 100uH
brown, black, brown
Output Amp
B-3
L10
VK200
ferrite wound
Output Amp
B/C-4
L11
T37-2
Turns = see text
LPF
A-7
L12
T37-2
Turns = see text
LPF
C-7
T1
KANK3334 (5u3H)
K3334 or 5u3H
BPF Rx
B-9
T2
KANK3334 (5u3H)
K3334 or 5u3H
BPF Rx
D-9
T3
KANK3334 (5u3H)
K3334 or 5u3H
BPF Pre Driver
G-1
T4
KANK3334 (5u3H)
K3334 or 5u3H
BPF Pre Driver
E-1
T5
FT37-43
toroid 10t 3t see text
Driver
B/C-2
T6
FT37-43
Toroid 8+8 see text
Output Amp
A/B-4
Note:
The components written in bold are different according to the version of ILER that you have chosen (ILER-40,
ILER-20 or ILER-17). In the kit, you will find all these components together in a separate bag.
Diodes
D1
1N4148
4148
RX Att
B-10
D2
1N4148
4148
RX RF limiter
A-8
D3
1N4148
4148
RX RF limiter
A-8
D4
1N4148
4148
Audio AGC preamp
H-10
D5
1N4148
4148
Audio AGC preamp
I-10
D6
1N4007 or 4001
1N4007 (1)
AGC preamp supply
J-10
D7
1N4007 or 4001
1N4007 (1)
BIAS supply
A-1/2
D8
Zener 47V 1W
BZX85C47
TX Out Amp
A-3
D9
Led doble
Bicolor
LED
L-5/6

ILER-40 MK2 SSB QRP Transceiver Kit Page 13
120-QUADRANT COMPONENT LAYOUT MAP

ILER-40 MK2 SSB QRP Transceiver Kit Page 14
ASSEMBLY
You can use the “individual parts list” or the “value/quantity parts list.” Using the “value/quantity parts list”
is the quickest way to mount components since all the circuit board components of the same value or
type can be placed one after the other. However, you will need the “individual parts list” to know how
each component is identified and its location on the circuit board. Depending on your personal
experience, you may prefer the individual parts list and feel more confident using it.
The 120-quadrant component layout map makes it very easy to find the location for all the components.
After mounting each component, it can be marked off in the “checked” column.
It is highly recommended that an inventory be taken of all the components to make sure that everything
is there and ready for assembly. Each constructor may have his/her own method of organizing the
components. One suggested method is to use a block of styrofoam packing material and poke the
components into it. The components can be sorted by type, value and size (ohms, micro-farads etc.).
IMPORTANT:
If you are going to use the ILER-40 with the ILER-DDS you do not need to mount the VXO circuit built on
board. Therefore, do not place the following components:
Polyvaricón, L6, X6, X7, R40, R41, C52, C53, R42, C54, R43, R44, R45, C56, L7, C51, Q10, Q11.
RECOMMENDED ASSEMBLY SEQUENCE

Resistance and jumper LK
- The resistors are installed first. Mount all the resistors R1 to R65 and trimmers P2, P3 and P5. P4 is the
volume potentiometer, which will not be installed yet.
Refer to the parts list, and select the first resistor, R1. Bend the leads as close to the component body as
possible, and place them into the appropriate holes according to the component outline printed on the
circuit board. Be careful to avoid confusing the resistors with the axial inductors which are a bit thicker.
All of the resistors have a light-colored body and a gold band on one of the ends. Inserting the resistor
leads into the holes, push down on the body of the component so that it rests flat on the board, hold it in
place, and then slightly bend the leads to hold the resistor in place. Then turn the board over and solder
the leads to the printed circuit trace. Make sure that the resistor body lies flat on the board so that its
leads are as short as possible. Please read the notes about soldering, as poor soldering is the most
common cause for a kit failing to work for the first time. After soldering them, cut the excess length off
the component leads as close to the joint as possible. Mount the next resistor in the parts list in the same
manner and continue until all the resistors are mounted. Note that some resistors are mounted vertically;
bend the leads and insert them as shown in the pictures.
The values which are in decade increments can be easily confused, such as 470, 4K7 and 47K, so be
sure to verify the colors before soldering the component in place! If you are in doubt, use a multimeter to
check the resistor value.
- Bend a piece of leftover component lead and insert it into the jumper location marked as LK on the
circuit board (located between Q2 and the “12V” terminals).

ILER-40 MK2 SSB QRP Transceiver Kit Page 15
   


Axial Inductors
L1, L2, L3, L4 L5, L7, L9
These components look like thick-bodied resistors and the body is colored blue or green. In its interior
there is a small coil wound on a ferrite core. Refer to the parts list to select the correct component for
each location. Mount the inductors in their respective locations, as identified on the circuit board, in the
same manner as you did with the resistors, but leave a separation of 1-1.5mm from the board.
Note: L4 is mounted vertically.
Diodes
Next mount the diodes, being careful to place them with the correct orientation. There is a band on one
end of each diode that corresponds to the component outline on the circuit board.
D1, D2, D3, D4 and D5 are 1N4148; they are normally orange in color with a black band and they have
the type “4148” printed on the body. Note that some diodes are mounted in a vertical position.
D8 is similar to the 1N4148 but slightly thicker. It is marked as BZX85C47.
D6 and D7 are 1N4007 diodes; they are black with a gray band. Mount D6 only.
DO NOT MOUNT diode D7 now (“bias” limiter), nor the bi-color LED rx/tx D9.

ILER-40 MK2 SSB QRP Transceiver Kit Page 16

Capacitors
There are ceramic, polystyrene (styroflex) and electrolytic capacitors. They all have their value printed on
the body. Refer to the “identified” column in the parts list.
When you mount them, make sure to leave the leads as short as possible.
C79, C80 and C81 are polystyrene capacitors; these are axial capacitors, but they must be placed in a
vertical position.
The values which are in decade increments can be easily confused, such as 100n and 10n, so be sure
to verify the numbers of their value before soldering them in place!
The electrolytic capacitors must be placed with the correct orientation: the LONG LEAD goes in the hole
labeled “+” and the SHORT LEAD is "-", indicated by a band containing "-" signs on the side of the
capacitor.
CV1 is a trimmer capacitor which is black in color. It does not have printed numbers. Place it with the
rounded edge closest to the relay.
CV2 + CV3 are the same capacitor; it is a dual-section “Polyvaricon” variable tuning capacitor. DO NOT
INSTALL IT yet.


Radial Inductors VK200
L8 and L10 are broadband ferrite RF chokes; they are mounted in a vertical position.
Separate them approximately 0.5 - 1mm above the board to prevent the windings from touching any part
of the printed circuit.

ILER-40 MK2 SSB QRP Transceiver Kit Page 17


Pin "headers"
Place and solder the pins in Mic(3), 12V(2), ATT(2), P1-RXG(3), ANT(2), ALT(2), D7(2), VXO(2),
BFO(2), J1(3), J2(2), K1(1), K2(1), and S(2).
Place “jumpers” between pins “J2” and “J1-B” and between the active pins of “P1-RXG” (if RX gain
potentiometer is not used).
Turn the board over and insert and hold the header in place, using a “jumper” placed on the header while
you solder the pins to avoid burning your fingers. Use your other hand to hold the soldering iron and
move the board towards the solder to solder the headers in place. If you have someone available to help
you, it will be much easier!

 


Transistors
All of the transistors have their type printed on the component body. Place them according to the
corresponding component outline printed on the circuit board. Transistors Q1 through Q11 are all of the
type BC547. Q12 is a 2N2222 and Q13 is a 2N5109; these two transistors have a small tab that must
match up with the component outline printed on the circuit board. Mount them with 1.5-2mm separation
from the board. Mount the crown-like heatsink, which you will find in the kit's "hardware" bag, onto Q13.
Do not install Q14 (TX power amplifier) yet.



ILER-40 MK2 SSB QRP Transceiver Kit Page 18

Integrated circuits
The component outline for the IC on the circuit board has a “U” shaped notch on one end, indicating the
end at which pin 1 of the IC is located. There is a similar notch on one end of the sockets. This should be
oriented over the "U" notch outline on the circuit board. Finally, pin 1 of the IC is marked with a small
dimple or dot; this end of the IC should oriented towards the notch in the IC socket or the "U" on the
component outline.
Mount the sockets for IC1, IC2, IC3 and IC4 in the locations printed on the circuit board. Make sure that
the sockets lie flat against the circuit board.
Next, insert IC1, IC2, IC3 and IC4 into their respective sockets.
IMPORTANT: Make sure that the IC's are fully inserted into their sockets. A poor contact between the
socket and IC can cause malfunction of the kit.
Now, mount the voltage regulators IC5, IC6, IC7 and IC8 in their respective locations according to the
markings of the component outline on the circuit board.
Crystals
Install X1 through X7.
X1, X2, X3 and X4 are part of the SSB filter, and X5 is the oscillator crystal for the BFO. These crystals
have been hand-picked (they have handwritten numbers on them) and have the same resonant
frequency, in order to obtain the best filter quality. The pair X6 & X7 are the VXO crystals.
The crystal housing should not touch the board; place them slightly separated from the board, at a
distance of 0.5-1mm.

ILER-40 MK2 SSB QRP Transceiver Kit Page 19
The ILER-20 has two options for the VXO crystals X6 and X7; option A uses a pair of 12.031MHz
crystals and option B uses one 12.096MHz crystal.
If you use 12.031MHz crystals, you must open the legs carefully to insert in its place. They have an
insulating sheet and can touch the board.


Relays
Install relays RL1 and RL2; they can only be mounted in one position.
Make sure that the body of the relay lies flat against the circuit board.
Shielded coils (cans)
T1, T2, T3 and T4 are shielded coils equivalent to Toko KANK3334, marked as 5u3H. They are RF
transformers for the passband filters. Make sure that they lie flat against the circuit board.
In order to solder the tabs of the shield, you will need to hold the soldering iron a little longer on the joint
or use a higher-wattage soldering iron.

LPF Toroids L11 and L12
L11 and L12 are identical. They use T37-2 cores (red toroid with 9.5mm/0.375in OD).
Cut 25cm (10”) of 0.5mm diameter enameled wire and wind sixteen (16) turns on a red toroidal T37-2
core. Spread the turns evenly around the toroid and wind them tightly so that so that they follow the
contour of the toroid and are as tight against the toroid as possible. The turns should be evenly
distributed around the circumference of the toroid. Leave pigtails of about 10mm (0.4”). Scrape off the
enamel with a cutter from the ends of the wire, in order to solder the toroid onto the board.
Counting the turns: Count one turn for every time the wire passes through the center of the toroid.
Important: wind the toroid exactly as shown in the pictures.
One turn more or less will affect the operation and the power output.

ILER-40 MK2 SSB QRP Transceiver Kit Page 20



  


Toroidal transformer T5
T5 is an impedance matching transformer. A FT37-43 is used (black toroid with 9.5mm/0.375in OD). It
has a 10-turn primary and a 3-turn secondary.
- Take 17cm (7.5”) of 0.5mm diameter enameled wire and wind ten (10) turns on a black FT37-43
toroidal core. Spread the turns evenly around the toroid and wind them tightly so that so that they follow
the contour of the toroid and are as tight against the toroid as possible. The turns should be evenly
distributed around the circumference of the toroid. Leave pigtails of 10-20mm (0.70”).
- Now take about 8cm (3.5”) of 0.5mm diameter enameled wire and wind three (3) turns on the other
side of the toroid, spacing the turns within the space between the turns of the previous winding. Leave
pigtails of 10-20mm (0.70”).
- Before inserting them on the circuit board, use a cutter or sandpaper to scrape off the enamel from the
pigtails of the windings. Solder them in place. Mount the toroid with approximately 0.5 - 1mm distance
from the board.
- The 3-turn winding is facing towards output transistor Q14 and the 10-turn winding towards C69 - C70.
Counting the turns: Count one turn for every time the wire passes through the center of the toroid.