7-digit scale for 2m (T)Rx with VXO

It is variation on the theme digital scale. Device was designed for older construction (T)Rx using VXO with frequency multiplication concept.

Rx2m

Schematics is identical to schmatics of counter. Switching +/- IF is not implemented, it is assumed, that IF will be substracted (or added) from measured value.

Program works the following way:

  • frequency is read the standard way,
  • value is multiplied by 8 by program,
  • it is substracted 100MHz and IF
  • result is transformed to 7 digits,
  • all digits are shifted to right (decades number will consequently be lost),
  • first digit is set "1"

Details can be found in the source code.

To calculate T1, T2, T3 and Z it should be used the same program as for digital scale with the same IF.