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E
LECRAFT
Revision A, Oct. 14, 2003. Copyright © 2003, Elecraft; All Rights Reserved
Introduction
The KXB30 adds 30-meter capability to the Elecraft KX1 transceiver. It also significantly improves
performance in the 49-meter SWL band segment (receive only) by re-resonating the KX1's receive band-
pass filter at about 6.2 MHz when the operator tunes below 6.7 MHz (with 40 meters selected). High-
performance PIN-diode switches are used to minimize insertion loss and ensure good 30-m sensitivity.
With only a dozen or so parts, the KXB30 is easy to build. The module is installed on the top side of the
KX1's main PC board. The KXB30's filters can be aligned from the bottom side of the board through the
access holes labeled 30A and 30B, so the top cover can be installed prior to alignment.
Specifications
30-m coverage
Added current drain
Size
KXB30
Assembly and Operating Instructions
Transmit/receive: 10100-10150 kHz; receive only: 8000-12500 kHz.
Approx. 3 mA
1.5" (L) x 0.75" (W) (3.8 x 1.9 cm)
Elecraft
•
www.elecraft.com
30-METER ADAPTER
•
831-662-8345
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Related Manuals for ELECRAFT KXB30
Summary of Contents for ELECRAFT KXB30
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Page 1: Specifications
PIN-diode switches are used to minimize insertion loss and ensure good 30-m sensitivity. With only a dozen or so parts, the KXB30 is easy to build. The module is installed on the top side of the KX1's main PC board. The KXB30's filters can be aligned from the bottom side of the board through the access holes labeled 30A and 30B, so the top cover can be installed prior to alignment. -
Page 2: Parts Inventory
Solid, insulated hookup wire, green 1 ft. E760008 MISC Rubber bumper, .04" thick x 0.3" square E980017 Parts Placement Drawing A drawing showing the locations of components on the KXB30 board can be found in Appendix F of the KX1 Owner's Manual. -
Page 3: Pc Board Assembly
All parts must be installed flat against the PC board, with no extra lead length exposed, or the KXB30 will not fit into its position on the RF board. Also, either before or after soldering, all leads must be flush-trimmed to keep them from shorting to the KX1's inside top cover. Flush- trimmers are necessary for this, because ordinary diagonal cutters cannot get close enough to the lead to clip it off right at board level. -
Page 4: Pre-Installation Checks
The KXB30 module will be installed upside-down in the position showed in Figure 1 on the next page, directly on top of U6. To verify that there are no obstructions, temporarily place the KXB30 in this location. The D and 5 pads should be to the left. The trimmer capacitors (C1 and C2) must line up with the two large holes in the KX1 board (on either side of U6). -
Page 5: Installation
Flush-trim the leads of these two wires on the bottom side. Insert the five 1" (2.5 cm) bare wires into the G, C, B, A, and G pads along the edge of the KXB30 board, from the top side. Before soldering, make sure almost the entire length of each wire is extending out... - Page 6 Verify that all wire leads have been inserted into the correct labeled pads. Press down on the KXB30 module so that it is as close as possible to the top of U6. Turn the KX1 over and verify that the adjustment slots on the KXB30's two trim caps are centered inside their access holes (30A and 30B).
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Page 7: Alignment And Test
Figure 2 Hold the KX1 so you can look at the edge of the installed KXB30 board as shown in b. All leads must be trimmed well below the height of the two rubber bumpers. -
Page 8: Circuit Details
C1 and C2 on the KXB30 are switched in on 30 meters, and also when you tune below 6.7 MHz (approx.) on 40 meters. This re-peaks the receive band-pass filter near the center of the 49-meter SWL band (about 6.1 MHz), greatly improving sensitivity in this band.
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