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E
Revision G, July 2, 2011. Copyright © 2011, Elecraft; All Rights Reserved
Introduction
The KSB2 option provides the Elecraft K2 with single-sideband transceive capability. With the KSB2
installed, the operator can use digital communications modes such as RTTY, packet, SSTV and PSK31 in
addition to SSB voice.
The KSB2 includes a 7-pole crystal filter optimized for SSB transmit and receive. This filter is always used
for SSB transmit. During receive, either the fixed SSB filter or the variable-bandwidth CW crystal filter can
be specified for each of the remaining SSB filter settings (FL2-FL4). The SSB filter can also be used for
receive in CW mode if desired. The BFO is individually programmable for each filter, allowing
considerable flexibly in optimizing settings for SSB, CW, or digital modes. Transmit and receive BFO
settings can be adjusted independently in SSB modes if desired.
Other features of the KSB2 include a programmable speech compressor and basic VOX (voice-operated
transmit) capability. In addition, the K2 provides a Carrier Balance mode in which the SSB transmit signal
is routed directly to the receiver. This mode facilitates carrier balance adjustment, and can also be used with
headphones to listen to mic audio whenever the mic gain or compression level is changed.
A wide variety of 8-pin microphones can be used with the KSB2. A mic configuration jumper block is
provided on the Front Panel PC board (see Microphone Configuration for details).
This manual supercedes relevant sections of the K2 Owner's Manual.
Specifications
Crystal Filter
Carrier Rejection
Speech Compressor
Current Drain
Size
i
Caution:
handling any transistors or integrated circuits, always put on an anti-static wrist strap or touch any
grounded, unpainted metal surface.
Elecraft
L E C R A F T
Assembly and Operating Instructions
Bandwidth approx. 2.3 kHz @ -6 dB; 6/60 dB shape factor approx. 2:1
-40 dB or better (typ)
Compression ratios: 1:1, 2:1, 3:1, 4:1
10-15 mA
4.1 x 2.2 inches (10.4 x 5.6 cm)
Some components in this kit can be damaged by static discharge. Before
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www.elecraft.com
K S B 2
S S B A D A P T E R
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831-662-8345
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Summary of Contents for ELECRAFT KSB2
- Page 1 RTTY, packet, SSTV and PSK31 in addition to SSB voice. The KSB2 includes a 7-pole crystal filter optimized for SSB transmit and receive. This filter is always used for SSB transmit. During receive, either the fixed SSB filter or the variable-bandwidth CW crystal filter can be specified for each of the remaining SSB filter settings (FL2-FL4).
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Page 2: Parts Inventory
Parts Inventory The table below lists all parts in the kit. The K2 Owner's manual has photographs of similar parts. Ref. Description Qty. Components on KSB2 Module CB,CN Capacitor, not used (leave open) CC,CM Capacitor, 27 pF ("27" or "270") CG,CH,CE,CK, Capacitor, 39 pF ("39"... - Page 3 Conn., 12-pin female, 0.1" pin spcg J9, J10 Conn., 3-pin female, 0.1" pin spcg Hardware and Miscellaneous HDWR Socket for U1 on KSB2 module, 28 pins HDWR #4 split lock washer (quantity shown includes 2 spares) HDWR 4-40 x 1/4" ZN ST phillips machine screw HDWR Standoff, 3/16"...
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Page 4: Firmware Upgrades
SSB Adapter As indicated in the parts list, most of the parts in the kit will be installed on the KSB2 PC board. A small group of parts will be installed on the K2's RF board, and a few on the Front Panel board. The last step in... - Page 5 Some capacitors are assigned letters rather than numbers, and some components are not labeled. Place the KSB2 PC board in front of you as shown below. At the far right end of the board, you'll find an area with a very symmetrical layout. This area contains the SSB crystal filter and filter switching components.
- Page 6 Panel and RF boards and separate them from the remaining items. Note: The .01 µF capacitors with small lead spacing (0.1", 2.5 mm) are only used on the KSB2 module, while the .01 µF capacitors with the wider lead spacing (0.2", 5 mm) will be installed on the Front Panel board.
- Page 7 Install all of the lettered capacitors shown below (CC, CM, etc.). After inserting each capacitor, bend its leads slightly to hold it in place. Limit soldering time to 2 or 3 seconds per lead, using a minimum amount of solder to avoid ground shorts. __CC and __CM (27 pF, "27"...
- Page 8 All diodes will be installed vertically as shown below. The anode lead will be inserted into the pad enclosed by a circle. The cathode lead (banded end) must be folded down and inserted into the adjacent pad, which is connected to the first pad by a white line. When installing diodes, check the Parts Placement Drawing as needed to make sure that you're inserting the leads into the correct pads.
- Page 9 U3 is a surface-mount IC that should already be installed on the top side of the board (SSM-2166). Examine U3 with a magnifying glass to verify that all leads are soldered. Install U6, the 78L06 voltage regulator IC. This device has a plastic package like a transistor. The flat side must face the U6 label as indicated by the component outline.
- Page 10 __R4 (56K, green-blue-orange) __R20 (18K, brown-gray-orange) __R21 (68K, blue-gray-orange) __R22 (560K, green-blue-yellow) __R23, __R24 (10K, brown-black-orange) Re-check the values of capacitors CG and CH (39 pF). Once the crystals are installed (following steps) it is difficult to gain access to these two capacitors. Locate the envelope containing the matched SSB filter crystals (X1-X7).
- Page 11 T1 and T2 are toroidal transformers, with two numbered windings: 1–2 and 3–4. These numbers are printed next to the pads on the PC board, and they also appear on the schematic drawing. T1 will be wound on a ferrite core (FT37-43, 3/8” [9.5 mm] diameter). For the larger winding, 3-4, use 22 turns of red enamel wire (13”, 33 cm).
- Page 12 Very small ferrite cores are used for RFC1 and RFC2 to minimize stray signal coupling. These cores are a little harder to work with than larger cores, and are also more fragile. If you find it necessary to hold them with a vice, use only plastic or rubber jaws and a minimum of pressure. Inductor RFC1 is wound with 19 turns of red enamel wire (9"...
- Page 13 KSB2 Module Installation Remove the top and bottom covers. (Do not remove the heat sink.) Disconnect and remove the frequency counter probe. Locate the 5-crystal CW filter on the K2 RF board (X7 through X11). If any ground wires are soldered to the tops of these crystals, re-locate them to the sides of the crystals, about 1/4"...
- Page 14 This equalizes the pitch of LSB and USB signals on receive, and provides optimal sensitivity in all operating modes. (It has no effect on transmit.) The parts for the modification can be purchased from Elecraft (part #XFILMDKT ). Instructions can be found in this PDF document: http://www.elecraft.com/Apps/new_fil_docs/k2_2nd_xfil_ssb_mod.pdf If you don’t have web access, call or write for a printed copy of the instructions.
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Page 15: Initial Test
SSB adapter to switch between the CW filter and the SSB filter. Leave the filter set for FL1 O P1 . Note: O P2 - O P5 also select O P1 since only one fixed filter is available on the KSB2. - Page 16 BFO Setup for LSB/USB Tap the button to see the BFO setting for the first SSB filter (BF1). You should see a display B A N D - similar to B F1 t 1 2 0 . The BFO frequency control parameter (in this case 1 2 0 ) has a range of 000-255. (A lower-case letter t appears in the BFO display for BF1, e.g.
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Page 17: Microphone Configuration
Determine the proper P1 wiring for your mic. First look in Table 2 (following page) to see if your mic is listed. (Also check our web site, www.elecraft.com, which lists additional microphones). If you have a mic that is not listed, use Table 1 in conjunction with your microphone's schematic to determine which wires to use. - Page 18 Table 2. P1 Wiring for Selected Microphones (NC = no connection). Elecraft MH2, MD2, Kenwood (MC-43,47,48,60), Icom (HM-7,12,22,23,36) Proset-K2 Alinco EMS-11 Mic kit includes 8 jumper blocks Do not connect pin 5 unless mic Do not connect pin 2 unless mic for use at P1, plus a 5.6-k resistor.
- Page 19 PA transformer. Set R60 fully counter-clockwise. (Newer K2s have a fixed resistor at R60.) Locate the carrier balance control, R1 on the KSB2 module. Set it close to the center of its range. Turn on power to the K2. Select 40 meters, LSB mode, and filter FL1. Set RF GAIN = max.
- Page 20 Filter Setup Connect the K2's internal frequency counter probe to TP2 (BFO). Select 40 meters, LSB mode, and filter FL1. (It's important to always do filter setup on 17 m or below to avoid confusion due to the K2's sideband inversion above 17 m. The settings apply to all bands.) Set up your filters exactly as shown in Table 3 (below), using CAL FIL.
- Page 21 Using The SSB Adapter Basic SSB Setup Mode Selection: To use SSB, select LSB or USB using the button. Tap to select SLO M O D E A G C AGC (recommended for all data modes). Filter Selection and Setup: Use the button to select the desired receive-mode crystal filter.
- Page 22 RF voltage on the K2 chassis due to the use of an end-fed or poorly-matched antenna. The problem can be solved by using an RF Isolator, available from Elecraft and other manufactures. Use 5 watts or less for digital data modes, since the duty cycle for digital modes can approach 100%.
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Page 23: Troubleshooting
Troubleshooting If you have difficulty during test or alignment, do the following: Check the orientation of all ICs, diodes, transistors, electrolytic capacitors and resistor networks. Look for unsoldered pins, solder splashes, or shorts to ground, especially in the area of the crystal filter. Measure resistances to ground in the crystal filter area, checking each crystal, both resistor networks, all diodes, numbered capacitors, and R5.
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