QRP Labs QCX-mini CW, Руководство по сборке, Страница: 72 / 121

test equipment to investigate the signal path of the QCX. Again, this guide was
filmed for the QCX transceiver, but since QCX and QCX-mini share the same circuit,
it is equally applicable to the QCX-mini.
8) POWER OUTPUT: Often, the power output is less than you had hoped. If you have
power output at all, this is a good indication that the transmitter is working properly.
There is a YouTube video about tuning your QCX+ and again, this applies equally to
the QCX-mini since the circuit is the same, just a different physical layout. The video
explains how to adjust the toroid inductances to achieve at least 4W output with 12V
supply (normally closer to 5W) on any band QCX+ 80 to 17m, and at least 5W with
13.8V supply (normally nearer to 6W).
9) https://groups.io/g/qrplabs is the QRP Labs discussion forum and is full of very
helpful people who will be able to advise. Be sure to describe your problem as fully
as possible since without this, any faults will be impossible to diagnose.
3.46 Adjustment and alignment
The first thing that you will notice when you apply power to the radio, is that there is
probably nothing at all shown on the display. Perhaps the LCD back-light will not even be
on (it depends on what configuration is currently saved), and there will be no visible signs of
life at all. Don’t worry (yet).
This is because you need to adjust the contrast trimmer potentiometer R47 at the top left of
the display board! Adjust it with a screwdriver until the display text looks right to you.
You should now see the following text on the display:
Select band:
160m
Turn the rotary encoder knob to select the band you have built the kit for. Then press the
left button to make your selection.
There are four more adjustments which now need to be made as part of the alignment
procedure. The adjustments are:

Band-pass trimmer capacitor peaking, C1

I-Q amplitude balance, R27

Audio phase shift adjustments, R17 and R24
Until these are adjusted, the sensitivity of the radio will be very low. So, do this first, before
going any further!
The location of these four adjustments is very easy to see and use, right above the push-
buttons, as shown in the following picture:
QCX-mini assembly Rev 1.05
72