QCX assembly Rev 1.08
103
9.6 Signal gen.
25,124,093
The signal generator function is switched off until you press the left button to select it. Then the
cursor appears under the 10MHz digit. You can then adjust this number just like any other
configuration parameter. Use the rotary encoder to increase or decrease the frequency. Press-and
hold, then turn the rotary encoder, to change the tune rate (move the cursor left or right).
As you adjust the frequency, the output frequency of the synthesiser is tuned to match.
The output frequency range is from 3.5kHz to 200MHz. The Si5351A Synthesiser chip datasheet
maximum frequency specification is 200MHz. However, in practice it has been found to still
operate reliably up to almost 300MHz.
The output waveform is a squarewave with amplitude about 3.5V peak-peak. The output is at the
Clk0 and Clk1 terminals (see diagram, above).
Note that the output is directly connected to the Si5351
A Synthesiser chip’s output pin. Take very
great care not to short the output to ground or in any other way abuse this output! If you damage
the Si5351A chip it is very difficult to replace
Note that where possible, the Si5351A’s Clk0 and Clk1 outputs are operated in quadrature with a
90-degree phase offset. The relationship does not hold at frequencies below 3.2MHz and may not
hold into VHF (To Be Determined).
Summary of Contents for QCX 5W CW
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