3. Local oscillator (PLL)
Please see schematic on my Download page
Now Local Oscillator produces 1268Mhz signal for the transverter. At beginning I planned to use as reference oscillator, the 10Mhz TCXO (24$ cost), that can be soldered directly on LO-PLL board without any external connection, but due to significal for microwave band thermal drift, I decided to use external OCXO.
4. OCXO 10 MHZ reference clock
OCXO was purchased from one of Chines Ebay sellers for ~30$, I mounted it together with power supply IC on simple wire-up PCB. This solution is perfect functioning and has nice stability, what else I need? There is only frequency drift after power-up till reference Oscillator’s Oven heating up to needed temperature. This OCXO has frequency voltage control input that is not used by me present time that can be used used in the future for GPS base frequency looking/calibration.
I’m finishing on this point..