2.32 Connections for basic operation
The following connections are required for basic transceiver operation.
PLEASE READ PRECEDING SECTION before applying power.
1) Power supply
A power supply is required, which needs to be able to supply up to 1A approximately, on transmit.
The supply voltage may be from 9V or 12V depending on how you wound the output transformer
T501. If the voltages fall, the RF output will be correspondingly lower. Operation much above 5W
output is not recommended and could lead to overheating and destruction of the final amplifier.
A 2.1mm DC connector plug is required; the center pin is + and the barrel is ground (negative).
2) Earphones
The earphones can be any stereo earphones such as commonly used with audio equipment,
mobile phones and so on, with a 3.5mm stereo jack plug. These commonly have a 32-ohm
impedance. The output op-amp IC (IC10) is not able to supply the required power output for
loudspeakers.
If you want to use a small loudspeaker you will need to ensure this is an “amplified speaker”
because the audio output will not be strong enough to drive a speaker directly.
3) Antenna system
The RF output is a filtered 50-ohm BNC output for connection to a usual antenna system
(antenna, and matching unit if applicable).
4) Straight key or paddle
To operate the QMX transceiver a straight key or paddle should be connected to the appropriate
jack, having a 3.5mm stereo jack plug. The shield (or main body) is ground. It does not really
matter which way around the tip and ring connections are (to dit or dah of the paddle) since if they
are the wrong way, there is a menu configuration item to swap them around. Similarly if using a
straight key, you can select in the firmware either tip, ring or both for the connection; this allows
use of a 3.5mm mono plug when using a straight key.
QMX assembly Rev 1.00e 62
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