Elecraft KXB3080 - Manual

Elecraft • www.elecraft.com • 831-763-4211
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LECRAFT KXB3080 30 and 80 METER ADAPTER
Assembly and Operating Instructions
Revision B, May 16, 2012
Copyright © 2012, Elecraft; All Rights Reserved
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Your KX1 must have an 18-turn inductor installed at L3 before using it on 80 meters. If
L3 in your KX1 has only 6 turns, see “KX1 Builder’s Alert, Modifying Final Amplifier Choke
L3” for instructions on how to rewind the inductor.
Introduction
The KXB3080 adds 30 and 80-meter capability to the Elecraft KX1 transceiver. It also improves the
receiver sensitivity on the other bands. High-performance PIN-diode switches are used to minimize
insertion loss and ensure good sensitivity.
The KXB3080 consists of two printed-circuit boards (PCBs). The main PCB sits between the main KX1
PCB and the front panel, directly below the encoder shaft. It is held securely in place by the leads attaching
it to the main PCB. If your KX1 is currently equipped with the KXB30 adapter, the KXB3080 will replace
it. A smaller PCB contains two toroidal inductors and a relay that replaces existing toroidal inductors L1
and L2 in the KX1. Because it must be extremely compact to fit in the space available, the main PCB uses a
number of surface mounted devices (SMDs). All of the SMDs are pre-installed for easy assembly.
Specifications
30-m coverage Transmit/receive: 10100-10150 kHz; receive only: 8000-12500 kHz.
80-m coverage Transmit/receive: 3500-4000 kHz; receive only: 1000 – 5500 kHz
Added current drain Approx. 3 mA except approx. 18 mA on 80 meters.
Size KXB3080 main PCB: 1-9/16” x 1-1/32” (40 mm x 26 mm)
LPF1 PCB: 13/16” x 13/32” (20 mm x 10 mm)
Tools Required
 Desoldering tool: An effective desoldering tool is essential. You will need to remove or replace
several parts on the KX1 PCB. A good vacuum desoldering tool such as the Soldapullt® model
DS017LS is strongly recommended to avoid damaging the PCB.
 Fine-tip temperature-controlled ESD-safe soldering station with 700 to 800F tip (370-430C).
Recommend a spade tip approx. 0.05” (0.13 mm) wide. Do not use a high-wattage iron or
soldering gun since this can damage pads, traces, or the parts themselves.
 Solder: IC-grade, small-diameter (.031”) (Kester #44 or equivalent) is recommended.
DO NOT use acid-core solder, water-soluble flux solder, additional flux or solvents of any
kind. Use of any of these will void your warranty.