SR Lite RX V6.2 40/30m 02_Local Oscillator

Install SMT Caps

Install the two SMT Caps (C1 and C2) on the bottom side of the board

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	C01	0.1 uF	(smt) black stripe	SMT 1206
❏	C02	0.1 uF	(smt) black stripe	SMT 1206

Install JP1 Bridge loop

Mount a small wire loop to bridge the x4 holes, holes 1 and 2, of JP1. (This will result in each crystal frequency being divided by four in the clocking of the QSD and QSE circuits. The center frequency resulting from the x4 jumper will be approximately the crystal frequency divided by four, or 7.056 MHz)

Install Transistors

Install the transistors, Q1 and Q2. Use the body shape silk screen marking to help in proper placement of each transistor.

Caution: be sure to carefully observe the markings on the transistors and distinguish the 3904 (Q1) from the 3906 (Q2) Getting these mixed up could damage the transistors and cause excessive load on the voltage regulator!

• Q1 2N3904 (next to X1)
• Q2 2N3906 (left of top mounting hole)

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	Q1	2N3904 NPN Transistor	2N3904	TO-92
❏	Q2	2N3906 PNP transistor	2N3906	TO-92

Install Resistors

Install resistors R1 through R5 and R7. Resistors are typically mounted on the board in a hairpin fashion with the body of each resistor located over its silkscreen circle. This is important because the test points (red dots on the schematics) are at the tops of the hairpins, are based on the assumption that this installation technique was used.

Normally, you will only need R6 for the 30m rig. R6 in the SoftRock Lite kit is only needed if the clock signal from Q2 to U2 does not result in proper clocking of U2. A value of R6 between 12k and 22.1k may be used if needed.

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	R01	10 ohm 1/4W 1%	br-blk-blk-gld-br	1/4W	N-S
❏	R02	10 k 1/4W 1%	br-blk-blk-r-br	1/4W	W-E
❏	R03	10 k 1/4W 1%	br-blk-blk-r-br	1/4W	N-S
❏	R04	499 1/4W 1%	y-w-w-blk-br	1/4W	W-E
❏	R05	1 k 1/4W 1%	br-blk-blk-br-br	1/4W	E-W
❏	R07	499 1/4W 1%	y-w-w-blk-br	1/4W	S-N
❏	R06	22.1k 1/4W 1%	r-r-brn-r-br	1/4W		only used in 30m Kit

Install Ceramic Capacitors

Note: C4 is only used in the 160, 30, and 20m kits

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	C03	100 pF 5%	101	Ceramic		band-specific - see chart
❏	C05	22 pF 5%	22J	Ceramic
❏	C04	100 pF 5%	101	Ceramic		band-specific - see chart. Used only in 160, 30, and 20m kits

Install Crystal

Mount the HC49 crystal mounting in the upper right corner of the board, mounting it vertically to the board. A small plated-through hole in the lower left corner of the crystal mounting position (blue hole in illustration at right) provides a place for a grounding wire to be soldered to the metal crystal case. The grounding wire also provides additional mechanical support for the crystal. Make sure the crystal is mounted slightly above the board since a trace runs on top of the board from one of the crystal holes to the base of Q1. You can use a piece of cardboard or wire insulation between the bottom of the crystal and the board to get the desired standoff distance while mounting X1.