ELECRAFT KAT100 Manual
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ELECRAFT KAT100 Manual

ELECRAFT KAT100 Manual

Automatic antenna tuner
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KAT100
Elecraft
Automatic Antenna Tuner
Revision D, February 13, 2015
KAT100-1 shown above. See page 3 for photo of full-height version (KAT100-2).

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Summary of Contents for ELECRAFT KAT100

  • Page 1 KAT100 Elecraft Automatic Antenna Tuner Revision D, February 13, 2015 KAT100-1 shown above. See page 3 for photo of full-height version (KAT100-2).

  • Page 2: Table Of Contents

    Table of Contents Introduction ..........................................3 Parts Inventory...........................................4 RF Board Assembly .........................................8 Front Panel Board Assembly....................................18 Final Assembly........................................19 Alignment and Test ........................................27 Using the KAT100........................................31 Troubleshooting........................................34 Specifications..........................................36 Circuit Details..........................................37 Schematic ......................................APPENDIX A Parts Placement Drawing..................................APPENDIX B...

  • Page 3: Introduction

    Elecraft K2/100 transceiver, as well as the basic K2. It can match recommended for use with the KAT100-2. The E T S 1 5 is identical to loads with SWRs in excess of 10:1, and can easily handle 150 watts of the ETS2 but is only 1.5"...

  • Page 4: Parts Inventory

    Parts Inventory You should do a complete inventory, and if you find anything missing, contact Elecraft. Leave painted panels wrapped until they are needed during assembly. This will protect the finish. Items supplied only with the KAT100-1 (with low-profile enclosure).
  • Page 5 Items in the KAT100 main parts bag (E850094), supplied with both KAT100-1 and -2. Color codes and markings are shown in parentheses. Reference designators from 101 up refer to Front Panel components. Refer to Appendix A of the K2 owner's manual for more parts photos.
  • Page 6 Toroidal inductor on FT37-43 core (gray, 0.37" dia.); see text E680003 Resistor pack, 3.9K, 4 individual resistors, 8 pins E510000 Transformer on FT50-43 toroidal core; see text E680008 IC, Programmed microcontroller for KAT100, PIC16F877 or PIC16F877A E610012 U2,U3,U4, IC, octal driver, TPIC6B595 E600032 U101,U102...
  • Page 7 20 ft. #20 enamel wire for L1-L8, red E760022 MISC Cable ties (for L1-L8; 2 spares) E980002 MISC Sand paper E850090 MISC KAT100 RF PC Board E100144 MISC KAT100 Front Panel PC Board (may be wrapped with one of the panels) E100145...

  • Page 8: Rf Board Assembly

    RF board. Secure each fastener from the top side of the board with 3/16" (4.8 mm) pan-head screws (black) and #4 split lock Place the KAT100 RF PC board in front of you, with the bottom washers (Figure 1b).
  • Page 9 In the steps that follow, you'll be installing groups of Install the high-voltage capacitors listed below. components. When working from a long list, install all of the items on one line before moving on to the next. Arrows (⇒) appear in the list Note: Save a few of the clipped leads from these capacitors for use as to remind you of this order.
  • Page 10 Locate the two 2N7000 transistors. Install these at Q2 and Q3 as shown in Figure 2a. Q2 is near the center 2-D fastener on the right Near the "KAT100 RF" label in the front-left corner, you’ll find edge, and Q3 is near the microcontroller, U1. The flat side of each a short jumper location, identified by a ground symbol ( ).
  • Page 11 If you're building a KAT100-1, skip the remaining steps Install the 40-pin IC socket at U1. Orient the socket so the end in this column. Connectors P3, P4, and P6 are only supplied with the open notch is toward the right edge of the board.
  • Page 12 Locate voltage regulator U8 (78M05 or 7805). Bend the leads of Install U5 (LM358, 8 pins), which is located in the back-right U8 to match its component outline (see Figure 4). Form the leads corner. A portion of the part number is printed on the board under the around the shaft of a small screwdriver to create smooth rather than IC ("358").
  • Page 13 #26 green. #20 wire is much larger in diameter than #26. Be sure to use only the type called for in the instructions; do not substitute other wire types. Cut wires to the specified lengths to avoid running out of wire. Pre-wound toroids are available from an Elecraft-approved source; see page 3.
  • Page 14 Secure L1 to the PC board using a cable tie. Two holes are In the next two steps, the leads of L1 will be stripped provided for this purpose, one inside the core and one outside. The and tinned. Toroid leads must be prepared correctly to cable tie should be installed such that its "head"...
  • Page 15 Toroidal inductors L2-L8 are shown in the photos at right (Figure 8). Wind each of these toroids using the indicated cores, either T80-0 (brown, phenolic) or T94-2 (red, iron powder). All are wound using #20 enamel wire. Use the wire length and number of turns shown. Place each toroid on its photo and adjust the turns spacing so it is similar to that shown.
  • Page 16 Locate the two dark gray (ferrite) toroid cores. The smaller of Strip and tin the leads of T1. the two (type FT37-43) has an outside diameter of 0.37" (9.5 mm). Using a magnifying glass, examine the red/green lead pairs to This core will be used in the following steps.
  • Page 17 __ W7, back edge include this symbol. Other readings should be +/- 10 %. __ J7, right front corner __ P7, right side, near L2 KAT100 Test Points (+, -) Resistance Top side, KAT100-1 only: Between pins 2 and 5 of relays K1-K18...

  • Page 18: Front Panel Board Assembly

    Front Panel Board Assembly Follow all LED installation instructions carefully to preserve the appearance of your KAT100's front panel. Place the Front Panel PC board in front of you with the "KAT100 FP" label at the left. Sort the rectangular LEDs into groups according to color.

  • Page 19: Final Assembly

    Figure 12 IC aligned with the notched end of its socket and outline. (The labeling on the IC should be upside down with respect to the "KAT100 RF" Slide the 12-pin female connector (J101) onto the pins of the 12- label at the left side of the board.)
  • Page 20 Figure 13 Unwrap the rear panel piece, and place it with the labeling facing away from you. Review Figure 13, which shows the vertical portion of Position J5 and J4 on the rear panel in the same way as J6, with the panel, along with all of the panel- and PCB-mounted connectors.
  • Page 21 The instructions on the next two pages apply only to the KAT100-1 (tuner with low-profile enclosure). If you're building Secure J3 (9-pin D connector) to the rear panel using two male- a KAT100-2, turn to page 23.
  • Page 22 It is painted on both sides. If you have purchased a tilt-stand kit for use with the KAT100, Figure 15 install the stand and front/rear feet now, following the instructions supplied.
  • Page 23 Attach the bottom cover and side panels that came with the holes in the 2-D fasteners, you may not have the rear panel pressed all Elecraft EC2 project enclosure. (If you also have an ETS2 tilt stand, the way onto the RF board.
  • Page 24 (saved in step 1). 12. Test your sidetone using the S T L menu entry. If the sidetone is To use the KAT100, your K2 firmware must be revision E D I T the S T L parameter, then tap D I S P L A Y to missing, 2.03d or later, and the IOC must be revision 1.07 or later.
  • Page 25 Be very careful not to nick the individual wires. Solder the BARE (shield), GREEN, WHITE, RED, and BLACK wires to the indicated connector pins at the KAT100 end of the cable. Peel back and cut away the foil shield. It may be helpful to melt some solder into each solder cup on the connector first.
  • Page 26 Control boards, C44 is not on the board, but in lieu of this you cable for the KAT100, or build a "Y" cable to share power with the K2 may have soldered a capacitor directly across R7. Remove it in either or K2/100.

  • Page 27: Alignment And Test

    KAT100 is aligned. Do not connect the KAT100 antenna relay, K18. The ANT1 and ANT2 LEDs, as well anything to P3, P4, and P6 on the KAT100 RF board at this time. as the ANT2 annunciator on the K2, should agree.
  • Page 28 SWR Bridge Null Adjustment During the first two parts of ATU alignment, the transmitted Make sure the KAT100 is set up exactly as described on page 27 signal will be fed through the ATU backwards from the normal (Preparing the KAT100 for Alignment). The signal must be routed direction.
  • Page 29 Disconnect the cables at the KAT100's RF IN and ANT1 jacks and reverse them. Make sure the KAT100 is set up exactly as described on page 27 (Preparing the KAT100 for Alignment). The signal must be routed Touch the voltmeter's (+) lead to pin 3 of U5 (Figure 19).
  • Page 30 Top Cover Installation Anti-Slide Brackets (KAT100-1 only) The KAT100-1 is designed to be placed beneath the K2. If the two are Turn off the K2 and KAT100. then tilted, using the optional ETS15 tilt stand or a slanted operating surface, the K2 tends to slide off during operation. To keep the K2 in Unwrap the KAT100 top cover.

  • Page 31: Using The Kat100

    AUX RF (J2) Note: If both a KAT100 and KAT2 are in the system, the KAT2 will be switched to C A L P mode, and its ANT1 jack selected. The A N T 1 / 2 This connector is not used by the KAT100 itself.
  • Page 32 The table below lists all settings for the A T U menu entry. A U T O SWR low (especially at high power). The SWR LEDs on the KAT100 mode is used most of the time. In this mode the ATU terminates are activated during transmit to alert you to SWR changes.
  • Page 33 Resonant and Multi-Band Antennas The KAT100 will tune up nearly any antenna cut for 40 or 80 meters on all bands. With multi-band antennas such as beams or verticals, the KAT100 will typically improve the match on each band used. It will...

  • Page 34: Troubleshooting

    KAT100 control cable. First, try the KAT100's power supply first (if it is separate from the K2's reducing power to 10 watts or less. This will force auto-tune to be done power supply).
  • Page 35 Exxx, Txxx, and the ATU firmware revision. Send this data to Elecraft for analysis. Also try A T U I N I T , which will reset all the ATU L and C settings to 0 on the next power up. You could have a single defective relay or component on the L-C board.

  • Page 36: Specifications

    Specifications All measurements were made using a 13.8 V, 1-amp power supply. Numeric values are typical; your results will be somewhat different. Specifications are subject to change without notice. L - C Ranges L: approx. 0-20 µH in 256 steps; C: approx.

  • Page 37: Circuit Details

    K2 via the VRFDET line, an additional high-current buffer, U6, is turned on (VRFEN = 5V). This is only required if there is no KPA100 connected (i.e., if a basic K2 is connected to the KAT100 via a KIO2 module).
  • Page 38 0 . 1 0 . 1 RYDATA RYCK RYLOAD = Components not supplied; for future use. = On bottom of PC board. KAT100 RF Board Elecraft Note: All relays are shown in the N.C. position. W. Burdick Rev. Date Sht.
  • Page 39 = Components not supplied; for future use. . 0 1 1 0 K 6 8 0 Elecraft KAT100 RF Board = On bottom of PC board. 1/2 watt 12CTRL 0 . 1 Note: All relays are shown in the N.C. position.

  • Page 40: J101

    C101 . 0 4 7 1 0 1 1 1 2 J 1 0 1 RF Board = On bottom of PC board. Elecraft KAT100 Front Panel Board Rev. Date Sht. W. Burdick 1 of 1 E. Swartz 1 / 4 / 0 3...

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