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Elecraft • www.elecraft.com • 831-662-8345

ELECRAFT KXB3080 30 and 80 METER ADAPTER

Assembly and Operating Instructions

Revision A, March 2006

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.

• Screwdrivers: A small #2 Phillips, a small flat-blade for slotted screws and a very small flat-

blade (about 0.1” or 2.5 mm wide) with an insulated handle to adjust the trimmer caps.

• Needle-nose pliers.

• Small-point diagonal cutters. Flush-cutting type is required (Xcelite MS54-5J or equivalent).

• Hobby knife or similar tool to cut a PCB trace.

• 50-ohm dummy load capable of handling 5 watts, minimum.

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Inhaltsverzeichnis

Seite 1 - Tools Required

Elecraft • www.elecraft.com • 831-662-8345 ELECRAFT KXB3080 30 and 80 METER ADAPTER Assembly and Operating Instructions Revision A,

Seite 2 - Parts Inventory

10 Bend C4 toward L8, if needed, to clear the KXB3080 PCB. Pass wirefrom pad Fthroughthe hole inthis circuitvia to theother side of the PCB.It will be

Seite 3 - Part I: Modify the KX1 PCB

11 Verify that your KXB3080 PCB is properly connected as follows: Make sure the loose end of the wire attached to pad F of the KX3080 PCB and routed t

Seite 4

12 Part III: Assemble and Install Low-Pass Filter LPF1 The LPF1 Low-Pass filter replaces L1 and L2 on the KX1 PCB. The completed and installed LPF1 is

Seite 5 - Pad "A"

13 Solder C1 in position, working from C1’s side of the PCB. Use minimal solder to ensure no fillet or solder bump forms on the relay side. The relay

Seite 6

14 RELAYRev AElecraftLPF1+1K1-Bare Ground Wire ConnectsHere and Extends from this (Relay) Side of the PCBThe ground wire goes to the + pad as shown. T

Seite 7

15 Thread leads 2, 3 and 4 of each core through their respective solder pads on the LPF1 PCB (see Figure 11). Lead 1 to each toroid will be connected

Seite 8

16 L2-1L2-1Inductor CommonInductorCommonKX1 PCBLPF1L1-1L1-1GroundGround Figure 13. LPF1 Connection Points. KX1 PCBKXAT1 PCBLPF1Toroids Alignedwith Edg

Seite 9

17 Part IV: Reassemble, Test and Align the KX1 with KX3080 Module Check the signal path through the LPF1 module as follows: Attach an 8 to 14 vdc powe

Seite 10

18 Operation The operation of your KX1 is the same as before, except now when you cycle through the bands you will also have the option of selecting 3

Seite 11 - LED menu

19 LPF1 Module The low-pass filter module adds 80 meter coverage to the filter network at the output of the transmitter by replacing the two inductors

Seite 12

2 • Digital Multimeter (DMM) for voltage checks and confirming resistor values. A DMM with capacitance measurement capability is desirable, but not r

Seite 13

20 GGL147µHR1470L247µHR2470D1C80.1C5300L447µHR4240L547µHR5240D2C30.1C440ABC2300C140CL347µHR3240R6R75D4704705VQ1ER815KC100.15V, 80 M3.5V ON, 2.5V OFFC9

Seite 14

3 For reference, the table below lists the pre-mounted surface-mounted devices. Ref. Description Qty Part No. C3, C6, C7, C8, C10 Capacitor, 0.1 µF

Seite 15

4 Replace C26 on the KX1 PCB (see Figure 1) as follows: Remove the existing 120 pF (121) capacitor. It will no longer be used. Clear all the solder f

Seite 16

5 Turn the KX1 PCB over and cut the trace from CB to C27/R1 as shown in Figure 2. Use a sharp hobby knife and cut across the trace several times as n

Seite 17

6 Rotate potentiometer R1 fully clockwise and check the resistance between ground and the part of the cut trace that goes to the open solder pad for C

Seite 18 - Circuit Details

7 Lead 2 goes straight down through the center of the core into the solder pad.Direction of each windingand position of windingsmust be exactly as sho

Seite 19 - KXB3080 Module

8 Part II: Assemble and Install the KXB3080 Option PCB Figure 5 shows the layout of the parts on both of the PCBs. Refer to these figures as needed wh

Seite 20

9 Cut lengths of the white-insulated Kynar® wire as shown below, strip 1/8” of insulation from each end, and solder each wire to the pad indicated on