ADF4351a F1CJN in a housing update 24-4-2017 is a usefull 35 - 4400 MHz generator locked to 10MHz Trimble GPSDO 2017 in a protective case detail: the Arduino LCD keypad screen buttons are accessible trough 3.2 mm drillings longer plastic shafts from other push buttons as extension under the front. The ADF4351a uses external 10MHz reference by disconnecting the internal 10M XTO i used a 3 pole jumper to have internal or external ref. that should be an front option switch ( to do) The external reference is the Trimble GPSDO 10MHz It's 30mV sinus shape is filtered and amplified to 3V3 ttl level for the ADF4351a Have been testing the ADF4351 demo board some time now But the signal from the PLL is very IMD distorted and unstable Useless sofar ... Arduino Uno controling ADF4351A F1CJN sketch QRPLABS Progrock / SI5351 and GPS QLG1 receiver all locked the Progrock output 10MHz ttl level signal matches the ADF REF in
Ham radio in JO33hg31 53.15N 6.35E