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EA3GCY ILER-20 MK2 User Manual

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ILER-20 MK2 SSB QRP Transceiver Kit Page 1
ILER-20 MK2
QRP SSB Transceiver Kit
Assembly manual
Version 2, last update: June, 2017
Translated by Marlin, KC0O
ea3gcy@gmail.com
Most recent updates and news at: www.qsl.net/ea3gc y
Thanks for constructing the ILER-20 MK2 SSB Transceiver kit
Have fun assembling it and enjoy QRP! 73 Javier Solans, ea3gcy
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EA3GCY ILER-20 MK2 Specifications

General IconGeneral
Output Power5W
Voltage13.8V DC
Input Voltage13.8 VDC
TypeTransceiver
ModeFM

Summary

SPECIFICATIONS

TIPS FOR FIRST TIME BUILDERS

Soldering

Provides critical guidance on proper soldering techniques to ensure successful kit assembly and operation.

Finding the correct component:

PARTS LIST SORTED BY VALUE/QUANTITY

120-QUADRANT COMPONENT LAYOUT MAP

ASSEMBLY

RECOMMENDED ASSEMBLY SEQUENCE

Outlines the suggested order for installing components on the circuit board for optimal assembly.

Resistance and jumper LK

Instructions for installing resistors and the jumper LK, emphasizing correct placement and soldering.

Axial Inductors

Details the installation of axial inductors, noting their appearance and mounting orientation.

Diodes

Provides specific instructions for mounting diodes, emphasizing correct polarity and orientation.

Capacitors

Guides on installing ceramic, polystyrene, and electrolytic capacitors, including orientation details.

ADJUSTMENTS AND TESTS

Preliminary Testing

Guides on initial power-up checks, voltage measurements, and listening for basic operation.

Adjustment of the VXO Tuning Inductor L6 and Polyvaricon CV2/CV3

Details the process of adjusting the VXO inductor and polyvaricon for desired frequency coverage.

Upper frequency limit adjustment

Explains how to adjust the polyvaricon's padders to set the upper limit of the band coverage.

Adjustment of the BFO/Carrier Oscillator

Describes two methods for adjusting the BFO frequency for optimal reception and transmission quality.

Adjustment of the RX pass band, T1 and T2

Guides on aligning the receiver's passband by adjusting toroidal coils T1 and T2 for maximum signal.

Adjustment of the idle current of the TX output transistor Q14

Details the procedure for setting the bias adjustment (P5) for the output transistor Q14.

Adjustment of the TX passband, T3 and T4

Explains how to align the transmitter's passband using coils T3 and T4 for maximum power output.

Adjustment of the Balanced modulator (carrier suppression)

Guides on adjusting P3 to minimize residual carrier signal for proper modulation.

Adjustment of mic gain P2

Details adjusting the microphone gain (P2) for optimal modulation quality without distortion.

IF YOUR KIT DOES NOT WORK AFTER ASSEMBLY

SCHEMATIC

WIRING