Digital scale for ATV in 1.2 GHz band

This is 7(5)-digit digital scale for ATV in 1.2 GHz band. It is based on ideas of PIC16F84 based frequency meter.
The measuring uses external predivision of VCO by 128 or 256. The decimal point is after GHz digit, but can be set at any position.

Hardware is identical with standard frequency counter - parts for digital scale are NOT used - it is one band device!

Total timing formula(s):

For predivision by 128: N = Fx * 128 000/4
For predivision by 256: N = Fx * 256 000/4

N = 60 * [7 * (36 + 3*T1) + 6 + 3*T2] + 12 + 3*T3 + Z
where:

  • T,T1,T2,T3 - are initial values of timing loops,
  • Z - are additional fine tunig NOPs,
  • Fx - Xtal frequency in MHz.

The values for T,T1,T2,T3 and Z you can easily find using my program.

You can get source code.

This software is free for private usage. It was created for HAM radio community members. Commercial exploatation is allowed only with permission of authors.

ATV device block schematics:

Addopted from nice picture sent by SP9WZM.

ATV