Elecraft KAT1 Manual Bedienungsanleitung PDF herunterladen

E L E C R A F T K A T 1 A U T O M A T I C A N T E N N A T U N E R

Assembly and Operating Instructions

Introduction

The KAT1 internal automatic antenna tuner (ATU) allows nearly any random-length wire antenna to be

connected directly to the Elecraft K1 transceiver and used on one or more bands. The L-network

configuration can be used with coax-fed or end-fed wire antennas, or with balanced feedlines via a balun.

Unlike some internal auto-tuners, the KAT1 functions on receive as well as transmit. This provides an

increase in receive sensitivity and improves rejection of out-of-band signals.

The KAT1 uses latching relays to reduce current drain to nearly zero except when actually tuning. These

relays select appropriate combinations of inductance and capacitance, as well as either a capacitor-in or

capacitor-out L-network configuration. Tune-up is controlled by the KAT1's microprocessor, which also

supplies SWR or power information to be displayed on the K1's LCD. Once a match has been found,

matching parameters are saved so that the settings can be recalled immediately on any band change.

ATU parameters (L, C, SWR, etc.) can be viewed using the K1’s menu. Additional menu entries are

provided to do component-level troubleshooting all relays, inductors, and capacitors.

In addition to being one of the world’s smallest automatic antenna tuners, the KAT1 is very easy to build

and install. The KAT1 module plugs directly into the K1’s Filter board with no additional wiring. Gold

plated connectors and redundant connector pins are used to provide excellent reliability for field operation.

Specifications

L - C Ranges L: approx. 0-5 µH in 16 steps; C: approx. 0-300 pF in 32 steps

Network Type L-network (series L, shunt C); C switchable to transceiver or antenna side

Tuning time 1 to 8 seconds typical for initial tune-up; < 1/2 sec. to recall per-band settings

SWR Display 1.0:1 to 9.9:1

Current Drain Approx. 10-30 mA during TUNE; < 5 mA at all other times

Size 5.0" (L) x 1.8" (D) x 0.5" (H) (12.7 x 4.6 x 1.3 cm)

Caution: Some components in this kit can be damaged by static discharge. Before handling any

transistors or integrated circuits, always put on an anti-static wrist strap or touch any grounded, unpainted

metal surface.

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Inhaltsverzeichnis

Seite 1 - Specifications

Seite 2 - Parts Inventory

10Power Calibration (R1 and R2)i The KAT1 will provide accurate power readings only if properly calibrated. This requiresan external wattmeter or an

Seite 3 - KAT1 PC Board Assembly

11Using The ATUCaution: Never touch an exposed antenna wire when transmitting. If you ever feel an RF burn orshock when touching the K1 chassis or ke

Seite 4 - Remove insulation

12Important ATU Operating Tips• A 1.0:1 SWR is not necessary for good performance. See Antenna Considerations. If the final SWR is above 3:1, you may

Seite 5

13Antenna ConsiderationsAn antenna tuner will not improve your antenna–it can only tune out the antenna's reactance. In general,use the longest,

Seite 6

14TroubleshootingIf the ATU menu parameter shows "- - - " at all times, make sure you have revision 109 or later of theK1 main processor fir

Seite 7 - K1 RF Board Preparation

Elecraft • www.elecraft.com • 831-662-8345Circuit DetailsThe ATU uses four inductors and five capacitors in an L-network. The capaci

Seite 8

2Parts Inventory The table below lists all parts in the kit. The K1 Owner's manual has photographs of similar parts.Ref. Description Part No. Qty

Seite 9 - SWR Bridge Adjustment (C9)

3K1 Firmware RequirementsTo use the KAT1 antenna tuner, you'll need K1 main processor firmware revision 109 or later. (The mainprocessor is U1 on

Seite 10 - Final Assembly

4 Install RF choke RFC1, which is located near U1. Ceramic resonator Z1 looks like a capacitor with three leads. Install Z1 (to the left of U1). Be ca

Seite 11 - Using The ATU

5 Cut L1's leads to about 1/2" (12 mm) long. Completely remove the enamel insulation from the leadsto within 1/8” (3 mm) of the core. The en

Seite 12

6 Tin T1's leads with solder. If the leads do not tin easily, the insulation may not be fully removed. Using an ohmmeter, measure between the red

Seite 13 - Antenna Considerations

7K1 Filter Board Preparation Remove the K1’s top cover (four screws). Remove the three screws holding the Filter board in place, and unplug the board.

Seite 14 - Troubleshooting

8 On the bottom of the RF board, locate the label DRV. Just to the right of the letter V in DRV is atrace segment about 1” (2.5 cm) long, with four 45

Seite 15 - KAT1 Schematic

9Initial Test Connect a power supply or battery to the K1 and turn on power. If you see or smell smoke, turnpower OFF immediately. Check all connectio

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