PA0O ham radio

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 ...

The latest test  is using a 74AC14 Schmidt trigger to shape up the 10MHz signal to the REF inout now the 10MHz is at  TTL level  about the same shape the onboard oscillator But still the 1296.200  shows -40dB  AM  tone modulated side-bands So my conclusion is this ADF4351A  can not generate a clean signal. When  I get new information maybe i will have another try. 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 input good output  1296.200    T9 + huge IMD  hum about 400Hz? the signal is locked  with 10MHz GPS DO but it does not sound stable at all  tuning with a 2...

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 input good output  1296.200    T9 + huge IMD  hum about 400Hz? the signal is locked  with 10MHz GPS DO but it does not sound stable at all  tuning with a 23cm receiver there is a huge AM tone  IMD around the carrier When locking to the ADF onboard 10MHz  X-tal oscillator ref this AM tone IMD  is much weaker but still not clean still searching for a solution that makes the ADF4351A output clean to be useful as LO generator The Progrock output is more clean but  also showing irregularities  absolute not Xtal T9 It can not be used  ...

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 input good output  1296.200    T9 + huge IMD  hum about 400Hz? the signal is locked  with 10MHz GPS DO but it does not sound stable at all  tuning with a 23cm receiver there is a huge AM tone  IMD around the carrier When locking to the ADF onboard 10MHz  X-tal oscillator ref this AM tone IMD  is much weaker but still not clean still searching for a solution that makes the ADF4351A output clean to be useful as LO generator The Progrock output is more clean but  also showing irregularities  absolute not Xtal T9 It can not be used  ...

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 input good output  1296.200    T9 + huge IMD  hum about 400Hz? the signal is locked  with 10MHz GPS DO but it does not sound stable at all  tuning with a 23cm receiver there is a huge AM tone  IMD around the carrier When locking to the ADF onboard 10MHz  X-tal oscillator ref this AM tone IMD  is much weaker but still not clean still searching for a solution that makes the ADF4351A output clean to be useful as LO generator The Progrock output is more clean but  also showing irregularities  absolute not Xtal T9 It can not be used  ...

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 input good output  1296.200    T9 + huge IMD  hum about 400Hz? the signal is locked  with 10MHz GPS DO but it does not sound stable at all  tuning with a 23cm receiver there is a huge AM tone  IMD around the carrier When locking to the ADF onboard 10MHz  X-tal oscillator ref this AM tone IMD  is much weaker but still not clean still searching for a solution that makes the ADF4351A output clean to be useful as LO generator The Progrock output is more clean but  also showing irregularities  absolute not Xtal T9 It can not be used  ...