Circuit diagramms of the 144 SBB/RX - Receiver

Posted on Feb 4, 2014

In order to understand how the following circuits are connected to each other you have to read the concept chapter first. Of course it is up to you to take just one or two of these circuits for your own developments. Lets start with the 6 MHz oscillator. The highest priority in this circuit is its long term frequency stability. You might be surpri

Circuit diagramms of the 144 SBB/RX - Receiver
Click here to download the full size of the above Circuit.

sed about the many buffer stages. I tried to make sure that the output frequency is 100% independent of the circuit load (and it seems that I even overdid it a little bit). Now we will have a look at the 36 MHz oscillator. It turned out that the shunt diode increase the phase noise. Therefore I recommend to skip it. The 22pF coupling capacitor can be increased to 27pF which gives a bit more tuning range. All capacitors in the resonator (i. e. between the BB204 and the J310) should be "zero temperature drift" types. The trimming capacitor is a silver-air-trimmer, but the long term stability will not decrease a lot if you use a cheap trimmer since the influence of this capacitor is quite small.

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