Elecraft XV Assembly Manual for XV222 - Manual (Page 42)

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RF PCB Assembly – Part II
In the following steps you will install components unique to each band on the
RF PCB. These components are provided in the XV50, XV144 or XV222
band completion kit package. Perform only the assembly procedure for the
transverter you are building.
XV50 – 50 MHz Transverter
Perform the following steps on the RF PCB only if you are building the
XV50 transverter.
Install resistor R24, 68 ohm (68J), 2 watt, in the lower left quadrant
near U6. Space this resistor about 1/16” (1.5 mm) above the PCB like you did
the 1-watt and 3-watt resistors earlier (See Figure 15).
Install resistor R6, 330 ohm (org-org-brn), 1/4 watt, above Q2 and U2.
Place this resistor directly against the circuit PCB.
Install Z4, a 56 ohm (grn-blu-blk), 1/4 watt resistor near U2.
Install transistor Q1 (NTE108) near U2.
Install the molded inductors listed below:
L2, .22 H (red-red-silver) near U1 in the upper left quadrant of the
PCB.
Z3, .15 H (brn-grn-silver) near U6 in the lower left quadrant of the
PCB.
L3, .22 H (red-red-silver) near frequency mixer Z1 in the lower
right quadrant of the PCB.
Install the following capacitors near transistor Q1:
__C12, 100 pF (101) __C14, 390 pF (391)
Install the following capacitors near frequency mixer Z1:
__C58, 390 pF (391) __C59, 390 pF (391)
Install capacitor C69, 10 pF (100) near L15 and L16.
Install the two 1-40 pF trimmer capacitors as follows. Align the flat
end of each trimmer with the flat end on the silk-screened outline
C33, near L17 on the right lower quadrant of the PCB. (On
some PCBs C33 may be marked C64).
C1, to the right relay K1 in the upper left part of the PCB.
Install crystal Y1 where indicated by the silk-screened outline inside
circle OV1. The crystal may be oriented either way. Be sure the crystal
case is sitting directly on the PCB. Do not hold your soldering iron on
the leads more than 2 or 3 seconds maximum. Excessive heat may
damage the crystal.
If you purchased the optional crystal oven with your transverter
(Elecraft part number E980076) install it now as follows:
Position the oven down over the crystal so the three leads on the
oven pass through the
+ , - , and NC holes in the PCB. The oven
will only go on the crystal one way.
Bend the leads over on the bottom of the RF PCB to hold the
oven in place, then tack-solder one lead.
Check to be sure the oven fully seated down over the crystal and
against the PCB. If necessary, reheat the soldered lead and adjust
its position.
Solder and trim all three leads.
Install a jumper across the solder pads for L4A near C13 on the right
side of the PCB. Use a discarded lead to make the jumper.
Install voltage regulator U3 (LM78L05) to the left of relay K6 at the
center of the PCB.
Install R29, 56 ohm (grn-blu-blk), 1/4 watt, near the center of the
PCB.
Install PC trimmer potentiometer R39, 1K ohm (102) near R29.