QCX assembly Rev 1.08
62
3.69
Connections for basic operation
The following diagram illustrates the basic connections for transceiver operation. A power supply
is required, which needs to be able to supply up to 0.5A on transmit. The supply voltage may be
from 7 to 16V, and the RF power output will depend on the supply voltage (higher output power is
produced at higher supply voltages).
Note that the 7805 voltage regulator requires no heatsink; however the heat production will
increase as supply voltage is increased, and the IC does get uncomfortably hot to touch at 16V
supply. Although I still do not believe it is necessary, you may feel less disturbed if you fit a small
heatsink to the 7805 voltage regulator if you intend to operate at higher supply voltages.
The earphones can be any stereo earphones such as commonly used with audio equipment,
mobile phones and so on.
The RF output is a filtered 50-ohm output for connection to a usual antenna system (antenna, and
matching unit if applicable).
Summary of Contents for QCX 5W CW
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