QRP Labs QCX-mini CW, Руководство по сборке, Страница: 55 / 121

3.28 Install RF output BNC connector
An alternative is installation of a right-angled SMA connector here (not supplied).
Solder the center pin first, to check that the alignment is correct; when happy, proceed to
solder the remaining pins. It is easier to ensure good alignment if the washer and nut are
removed prior to installation.
Accurate alignment is very important, to ensure that the connector fits into the hole of the
optional QRP Labs QCX-mini enclosure (if used). The rim on the connector body should not
overlap the edge of the PCB. The BNC connector must sit squarely on the board with the
metal body extending at 90-degrees to the PCB edge. Cut the excess wire length of the
center pin after soldering.
The metal body of the BNC connector is
directly cast to the four ground pins of the
connector. Soldering these pins requires a lot
of heat! Using a 60W soldering iron during
prototype assembly, the iron was held to each
pin of the connector for at least 20 seconds to
heat it up fully and ensure a good electrical and
mechanical bond.
It needs a lot of heat, some time, and a lot of
solder… Do not worry if you create solder
bridges to the ground pads which are available
optionally for the SMA connector; but do make
sure that there are no short-circuits to the center pin!
QCX-mini assembly Rev 1.05
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