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ELECRAFT K1 Manual
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ELECRAFT K1 Manual

Ssb modification
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K1 SSB Modification (Ed.2)
This description provides the receiver (RX) modifications, assembly, alignment and operation as a first step. In a second step you can add the
remaining transmitter (TX) modifications, assembly and alignment. Then you have converted your K1 into a QRP CW / SSB transceiver.
Beta-test ED1 PCB installed in I0CG's K1

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Summary of Contents for ELECRAFT K1

  • Page 1 This description provides the receiver (RX) modifications, assembly, alignment and operation as a first step. In a second step you can add the remaining transmitter (TX) modifications, assembly and alignment. Then you have converted your K1 into a QRP CW / SSB transceiver.
  • Page 2 Replace the following components: Replace C63 with 100-pF (I suggest you to disconnect only one pin of C63 and put the new capacitor on the bottom side of the K1 RF PCB, so that restoring the original value becomes very easy).
  • Page 3 Install all components of the RX section (see schematic and top layout). The SMD components on the bottom side of the SSB board are pre- assembled. When ready, the SSB board can be plugged on the K1 RF board trough the Noise blanker and new added connectors (no wires are necessary). RX alignment Set V1 on the SSB board to 4.9 Vdc (test point, pin 2 - U1)
  • Page 4 Verify that relay RL1 goes switched “on” when FL1 or FL3 are selected. Operation: Press WPM+ and select FL1 (SSB filter with LSB is selected) to set your K1 into LSB mode Press WPM+ and select FL3 (SSB filter with USB is selected) to set your K1 into USB mode Select FL2 To set your K1 into CW mode.
  • Page 5 TX Part Assembly Preliminary K1 RF Board Modification Add the following components: • Solder a wire (about 2 “ (50mm) of length )into pin 6 of U8 on the RF board (you can solder the wire in the C13 side connected to pin 6.
  • Page 6 • Add one connector pin (female) to have a 8V supply for the SSB modification board. (this supply voltage is available on the K1 RF Board next to the C18 capacitor, see page 8 for reference) • The following components should be inserted into the K1 RF board to change the operating mode of class the final TX amplifier into AB- Operation.
  • Page 7 For more clarity the Class AB modification is shown in the following schematic diagram of the performed modification. : Class-AB Modification of the K1 final TX amplifier...
  • Page 8 In order to access the microphone jack J1 you need to drill a hole into the left side panel at the corresponding position of J1. It is also possible to add a microphone jack on the back panel of your K1 and run a shielded cable from this jack to the K1 SSB board. For this purpose an additional 2-pin connector (in parallel to the jack J1) has been provided on the SSB board.

  • Page 9: Operation

    A special interface with two 3.5 mm stereo connectors must be made available in the case you use a standard Mike with PTT. Autotuner compatibility: You can perform the tuning as described in the K1 manual in CW mode. No problems if you use the internal autotuner. PSK31 compatibility No problems to use PSK31 or RTTY transmission.
  • Page 10 • Add 1N4148 diode from R27 and GND. • Isn’t necesary use a shield cable from the SSB board and the K1 RF board, but only a wire 2 “ long • R27 become 47 KHohm (necessary to reduce the Mike amplification) •...
  • Page 11 Mike installation...
  • Page 12 Schematic Diagram of RX and TX K1 SSB modification.
  • Page 13 Ed2 PCB (see the Class AB mod.)
  • Page 14 The red points indicate the locations at which (female) connection pins must be added on the K1 RF Board.
  • Page 15 K1 SSB modification board – upper side layout ATTENTION!: ERRATE POLARIZATION INDICATION on C16 and C17 on PCB only (schematic is correct)
  • Page 16 Bottom layout . The SMD components are pre-assembled on the board On this side only the following non-surface mount components are installed: (“male” connectors used to plug the modification board into the K1) • 8 pin connector P2 • 2 pin connector K1/c30 •...
  • Page 17 SSB – Modification Parts List NAME VALUE RS - Code 100PF 100PF 100kpF 33PF 47PF 47PF 47PF 33PF 220pF 33pF 3-22pF TRIM (green) 1/10PF TRIM. (yellow)Rs-code 125-957 47pF 10nF 10nF 1 UF 1 UF 1 UF 1 UF 100PF 100pF 10nF 10nF 33PF...
  • Page 18 1N4148 1N4148 1N4148 NC/3-Ckt 100uH 2-pin 8-pin 2-pin 2-pin 2n4401 Rs-code 299-654 2N3819 Rs-code 293-713 2n4401 BC318 2n4401 BCY70 Rs-code 294-609 2n4401 2n4401 27k OHM 27k OHM 1500 OHM 2200 OHM 22 kOHM 2.2 kOHM 330 kOHM 2.2 kOHM 22k OHM 47k KOHM 47k KOHM 2.2 kOHM...
  • Page 19 47K OHM 2.2 kOHM 1500 OHM 15K OHM 2.2 kOHM REL1 TF2-5V NAIS Rs –code 113-8881 RFC1 LM2904 RS-code 810-273 LM2904 RS-code 810-273 SA602 RS-code 606-765 10k OHM Rs-code 187-539 10k OHM Rs-code 187-539 Rs-code 187-595 Rs-code 187-595 XTAL 4915KHz RS-code 300-990 XTAL 4915KHz...