14
Step 2:
1.
Insert the 20.000 MHz, 12.000 MHz and 32.768 KHz crystals (XTAL) and apply
a small amount of flux on the bottom solder hole where the leads protrude. Then,
solder the 20.000 MHz, 12.000 MHz and 32.768 KHz crystals and trim the
excess length of the crystal leads on the bottom of the PCB.
2.
Insert the 3.3V voltage regulator.
The regulator is oriented with the black
part of the regulator body facing the USB Type B connector.
See the
top left corner of the PCB in Figure 24 below.
Apply a small amount of
flux on the bottom solder hole where the leads protrude. Then, solder the 3.3V
voltage regulator and trim the excess length of the regulator’s leads on the bottom
of the PCB.
3.
Insert the USB Type B connector and apply a small amount of flux on the bottom
solder hole where the four (4) pins and the two (2) larger posts protrudes. Take
care in inserting the four smaller pins into the PCB. Make sure that the pins are
not bent. Then, solder the USB Type B connector.
4.
Insert the BNC connector and apply a small amount of flux on the bottom solder
hole where the two (2) mounting posts and the two (2) pins protrude. Then,
solder the BNC Connector.
5.
Insert the 3.5mm antenna jack and apply a small amount of flux on the bottom
solder hole where the leads and mounting posts protrude. Then, solder the
3.5mm antenna jack.
6.
Note in Figure 7 how all of the solder joints of the BNC connector, USB type B
connector and the 3.5mm antenna jack are completely filled in with solder.
