3.33 Install connector X2: PTT (key)
X2 is a 3.5mm jack socket. This is used for supplying the PTT (key) signal to the amplifier to
switch it to Transmit mode. The connector is a bit of a tight fit and again, please ensure accurate
alignment with the outline on the PCB silkscreen. This is particularly important if you are planning
to install the amplifier in the optional QRP Labs enclosure, so that the socket barrel fits through the
hole in the rear panel. If the alignment is not accurate, the hole and the barrel will not line up
correctly. Note: two of the pads are very close together and you may easily create a solder bridge
between them: don’t worry! These pads are connected by a trace anyway!
3.34 Install connector X1 and 3: RF In and Out
X1 and X3 are BNC connectors for RF input and RF output. Ensure accurate alignment with the
PCB silkscreen so that the connectors line up perfectly with the rear panel of the QRP Labs
enclosure. The ground and center pin connections should be soldered first; when you are 100%
happy with the alignment, then solder the two mounting posts too.
50W QCX PA kit assembly
1.00q
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