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EA3GCY ILER-20 MK2 Assembly Manual

Ssb transceiver kit
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ILER-20 MK2
QRP SSB Transceiver Kit
Assembly manual
Version 2, last update: June, 2017
Translated by Marlin, KC0O
ea3gcy@gmail.com
:
www.qsl.net/ea3gcy
Most recent updates and news at
ILER-20 MK2 SSB Transceiver kit
Thanks for constructing the
Have fun assembling it and enjoy QRP!
73 Javier Solans, ea3gcy
ILER-20 MK2 SSB QRP Transceiver Kit
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Summary of Contents for EA3GCY ILER-20 MK2

  • Page 1 Translated by Marlin, KC0O ea3gcy@gmail.com www.qsl.net/ea3gcy Most recent updates and news at ILER-20 MK2 SSB Transceiver kit Thanks for constructing the Have fun assembling it and enjoy QRP! 73 Javier Solans, ea3gcy ILER-20 MK2 SSB QRP Transceiver Kit Page 1...

  • Page 2: Table Of Contents

    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-20 MK2 SSB QRP Transceiver Kit Page 2...

  • Page 3: Introduction

    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-20 MK2 SSB QRP Transceiver Kit Page 3...

  • Page 4: Specifications

    Type: Superheterodyne, balanced mixer. Sensitivity: 0.250uV minimum discernible signal. Selectivity: 4-pole crystal ladder filter, 2.2 KHz nominal bandwidth. IF Frequency: 3.276 MHz. Built-in audio preamp and AGC. Audio output: 250mW @ 8 Ohms. ILER-20 MK2 SSB QRP Transceiver Kit Page 4...

  • Page 5: Tips For First Time Builders

    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-20 MK2 SSB QRP Transceiver Kit Page 5...

  • Page 6: Iler-20 Mk2 Ssb Qrp Transceiver Kit

    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-20 MK2 SSB QRP Transceiver Kit Page 6...

  • Page 7: Parts List Sorted By Value/Quantity

    C8, C11, C37, C38, C49, C74, (elec.) 10uf 25V or 35V C13 (elec.) 1uf 25V, 35V or 63V 120p CV1 Murata trimmer BFO Black 160p CV2+CV3 dual Polyvaricon gang. Tuning. 160p + 70p ILER-20 MK2 SSB QRP Transceiver Kit Page 7...
  • Page 8 Q14 (Output Amp) Heatsink Heatsink Q13 (Driver) Heatsink small 110cm wire 110cm enameled copper wire 0.5mm 115cm wire 100cm enameled copper wire 0.3mm ILER V2 PCB 100mm x 120mm ILER V2 PCB ILER-20 MK2 SSB QRP Transceiver Kit Page 8...

  • Page 9: Individual Parts List

    I-4/5 brown-black-red TX Pre-driver yellow-violet-red TX Pre-driver NOT USED TX Pre-driver brown-black-brown TX Pre-driver brown-black-gold TX Pre-driver brown-black-brown TX Driver E/F-3 brown-black-red TX Driver E/F-2 yellow-violet-brown TX Driver yellow-violet-red TX Driver ILER-20 MK2 SSB QRP Transceiver Kit Page 9...
  • Page 10 103 or 0.01 Audio Amp out. L-9/10 100uF 100uF 25V or 35V (elec) Audio Amp mute 100uF 100uF 25V or 35V (elec) Audio Amp out. K-10 100n 104 or 0.1 Audio Amp out. ILER-20 MK2 SSB QRP Transceiver Kit Page 10...
  • Page 11 11.000MHz or 11.046MHz 11.000MHz or 11.046MHz Semiconductors Checked Ref. Type Ident./Comment Circuit section Located Transistors BC547 BC547 RX RF mute BC547 BC547 Carrier switch BC547 BC547 Audio AGC-preamp BC547 BC547 Audio AGC-preamp ILER-20 MK2 SSB QRP Transceiver Kit Page 11...
  • Page 12 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. ILER-20 MK2 SSB QRP Transceiver Kit Page 12...

  • Page 13: 120-Quadrant Component Layout Map

    120-QUADRANT COMPONENT LAYOUT MAP ILER-20 MK2 SSB QRP Transceiver Kit Page 13...

  • Page 14: Assembly

    - 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-20 MK2 SSB QRP Transceiver Kit Page 14...
  • Page 15 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-20 MK2 SSB QRP Transceiver Kit Page 15...
  • Page 16 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-20 MK2 SSB QRP Transceiver Kit Page 16...
  • Page 17 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-20 MK2 SSB QRP Transceiver Kit Page 17...
  • Page 18 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-20 MK2 SSB QRP Transceiver Kit Page 18...
  • Page 19 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-20 MK2 SSB QRP Transceiver Kit Page 19...
  • Page 20 - 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. ILER-20 MK2 SSB QRP Transceiver Kit Page 20...
  • Page 21 - Cut a 31-32cm (12in) long piece of 0.5mm diameter enameled wire. - Bend the wire in half. - Twist it so that there are about two twists per cm. 16cm (32 cm bent in half) ILER-20 MK2 SSB QRP Transceiver Kit Page 21...
  • Page 22 - Mount the toroid into the appropriate holes as marked on the circuit board. Note: For greater clarity, the drawing shows one black wire and one red wire. In reality, both wires are of the same color.  ILER-20 MK2 SSB QRP Transceiver Kit Page 22...
  • Page 23 If needed, add some washers to space the screws out from the panel to avoid this problem.      ILER-20 MK2 SSB QRP Transceiver Kit Page 23...
  • Page 24 LED opposite to what the circuit board's component outline shows. It should illuminate in green in Rx and in red in Tx; if it is the contrary, just turn the LED around (the middle lead is always the common).   ILER-20 MK2 SSB QRP Transceiver Kit Page 24...
  • Page 25 You may drill another hole on the heatsink if that better suits its position in your box. You may also mount the circuit board on the rear part of the box with the heatsink external to the box. DO NOT operate the transceiver without mounting Q14 to the heatsink.   ILER-20 MK2 SSB QRP Transceiver Kit Page 25...
  • Page 26 - To operate only in SSB, no connection to K1 or K2 is necessary. - All of the adjustments mentioned in this manual are for operating in SSB. ILER-20 MK2 SSB QRP Transceiver Kit Page 26...

  • Page 27: Adjustment And Testing

    The following illustrative table uses J1 with a jumper in position B and the turns on L6 moderately compressed (this is the configuration that I recommend for the ILER-20): For the ILER-20, jumper J1 should be placed in position B. ILER-20 MK2 SSB QRP Transceiver Kit Page 27...
  • Page 28 You may find that once you have secured inductor L6, the VXO frequency has changed considerably in relation to the adjustments that were made before. They can also absorb more or less humidity, affecting the stability. ILER-20 MK2 SSB QRP Transceiver Kit Page 28...
  • Page 29 You can adjust CV1 while listening to a USB signal on the 20 meter band. This is a “two-hand” operation; tune the VXO to obtain the best possible intelligibility, and next adjust CV1 to obtaining the best possible audio quality. Repeat these adjustments until obtaining the best possible results. ILER-20 MK2 SSB QRP Transceiver Kit Page 29...
  • Page 30 If you don't have a meter for measuring milliamperes, adjust P5 to about 75% of its range (going clockwise); this position will be within the correct margin. After finishing the adjustment, return jumper J2 to its position and readjust P2 (mic gain).  ILER-20 MK2 SSB QRP Transceiver Kit Page 30...
  • Page 31 Connect an oscilloscope to the antenna jack (along with a 50 ohm load). Adjust the transceiver to see the signal envelope and, speaking loudly into the microphone, adjust P2 just to the point before seeing distortion on the waveform. ILER-20 MK2 SSB QRP Transceiver Kit Page 31...

  • Page 32: If Your Kit Does Not Work After Finishing Assembly

    - If you decide that technical assistance is needed, you are welcome to send an email to ea3gcy@gmail.com. As a last resource, you may send the kit in for repair; however, I will have to charge for any repairs done, although I will try to keep the cost as moderate as possible.
  • Page 33 BC547 3.95 3.95 3.80 3.80 7.97 7.97 2N2222 2.30 1.70 13.4 2N5190 2.25 1.60 13.5 13.5 2SC1969 0.68 0.03 13.5 13.5 VCC = 13.5V Approximate values of +/-10% can be considered correct. ILER-20 MK2 SSB QRP Transceiver Kit Page 33...

  • Page 34: Limited Warranty

    Please, BEFORE returning a product, request instructions by email at: ea3gcy@gmail.com Javier Solans, EA3GCY, warrants this device to function according to the specifications, provided that it is assembled and adjusted as described in this documentation, and used correctly according to all provided instructions.

  • Page 35: Schematic

    SCHEMATIC ILER-20 MK2 SSB QRP Transceiver Kit Page 35...

  • Page 36: Wiring

    (the end of the diode with the printed band) goes to the positive wire. If your power supply has short-circuit protection or has a fuse on its output, fine; otherwise, you will need to build or buy a cable with an in-line fuse in series. ILER-20 MK2 SSB QRP Transceiver Kit Page 36...

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