VXO

Dear all,

We wanted to make a simple solution for Lake City Net operating at 7085KHz daily between 8:15Am and 8:30Am. We have chosen IF as 4915KHz for which standard low cost crystals are available. This requires a LO of RF+IF=12MHz, We have happily configured a 12MHz VXO. This VXO fortunately covers 11995KHz also giving rise to coverage of CHARMINAR NET operated at 7080KHz daily until 8Am. Below is picture of experimental VXO and the table contains test result.

Different values of the crystal with different capacitor in X position