Elecraft K1 User Manual

Page 29

LECRAFT

Install the resistor networks listed below, checking the part

numbers carefully before installation. Orient the black dot or bar on
each network towards pin 1 of its component outline.

__ RP3, 47 k, 10 pins (10A3473G, 103C104, or 770103473)
__ RP1, 100 k, 8 pins (8A3104G, 83C104, or 77083104)
__ RP2, 100 k, 8 pins (8A3104G, 83C104, or 77083104)
__ RP6, 27 k, 6 pins (6A3273G, 63C273,

4306R-102 LF273 or 77063273)

__ RP4, 3.9 k, 6 pins (6A3392G, 63C392,

94163392P or 77063392)

__ RP5, 3.9 k, 6 pins (6A3392G, 63C392,

4163392 or 77063392)

Install a 33-µH RF choke (ORG-ORG-BLK) at RFC1, near the

front edge of the board. (Orange bands may appear to be brown.)

Install a 100-µH RF choke (BRN-BLK-BRN) at RFC4, in the

transmit area of the board.

The ceramic trimmer capacitors (C13 and C20) have one side

that is flattened. This side must be oriented towards the flattened
side of the component outline. Install C20 near the front edge of
the board, and C13 in the back-left corner.

Sort the diodes into groups for identification purposes. You

should have two types of small glass-bodied diodes: 1N5711, and
1N4148. The 1N4753 zener diode may also be glass, and is larger.
If necessary, use a magnifying glass to read the labels.

Diodes with long axial leads (such as the types mentioned

above) must be installed with the banded end (cathode) oriented
towards the banded end of their component outlines. If a diode has
more than one band, the widest band indicates the cathode end.

Install 1N4148 diodes at D17 and D1, observing the proper

orientation as explained above. Do not solder yet. D17 and D1 are
both near RP2, in the VFO area.

Install 1N5711 diodes at D2 and D15, but do not solder yet. D2

is in the VFO area. D15 is in the back-right corner near J8.

Re-check the orientation of the diodes, then solder.

Identify the two types of black, axial-lead diodes: 1N4007 and

SB530. The 1N4007 is the smaller of the two.

Install the SB530 diode at D16, near the back edge of the

board.

Install 1N4007 diodes at D11 and D10, to the left of D16.

Install a 1N4007 diode at D5, near J7.

The varactor diodes have a small plastic package, like a TO-92

transistor, but with only two leads. Sort the varactor diodes into
two types: MV209 (quantity 1) and 1SV149

or V149SL (quantity 4).

Install the varactor diodes listed below. The flat side of each

diode must match the flat side of its PC board outline. Bend the
leads slightly on the bottom to hold the diodes in place.

__ D4, MV209

(in the VFO area)

Note: The 1SV149 diodes may have a third lead in the center, cut off near the
body. Mount them slightly above the board to avoid letting this lead short
the two pads together.

__ D3, 1SV149

(in the VFO area)

__ D6, __ D7, __ D8, 1SV149

(right-front corner)

TO-92 package may have either of the package types

shown in Figure 5-4 (page 19). Orient the large flat side of the
package with the flat side of the component outline. Verify the
part numbers using a magnifying glass if necessary.

Install the TO-92 package transistors listed below, starting with

Q9 in the VFO area. Observe anti-static precautions.

__ Q9, 2N3906

⇒

__ Q8, J309

⇒

__ Q11, J309

__ Q10, 2N7000

__ Q2, MPSA14

__ Q1, 2N7000

__ Q3, 2N4124