SA BPF1

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This page describes the 1st IF Filter for the DIY Spectrum Analyzer.

Summary

Schematic for the rev0VTx VCO.
Board for the rev0VTx VCO.

The 1st IF Filter is a modified coupled-line microstrip filter. The first mixer upconverts the input of 30MHz-2.5GHz to a fixed 3.5GHz IF via the 1st LO of 3.53-6GHz. The first IF filter must reject the 2nd image of 1.94GHz, and RF feedthrough at 30MHz-2.5GHz.

Testing

  • 8.x.2013: ...


Frequency (MHz) Power (dBm)
150 -0.06
200 -0.02
250 -0.03
300 -0.07
350 -0.06
400 0.03
450 0.04
500 0.02
550 -0.07
600 -0.07
650 0.05
700 0.09
750 -0.05
800 -0.03
850 0.02
900 0.00
950 -0.07
1000 -0.10
1500 -0.17
2000 0.21
2500 0.04
3000 0.62
3500 1.72
4000 1.47

Revisions

  • 1.0: Initial revision.

PCB/Construction Photos