SA BPF1
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This page describes the 1st IF Filter for the DIY Spectrum Analyzer.
Summary
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
- Rev0VTx VCO PCB Bottom.jpg
Bottom of unpopulated PCB
- Rev0VTx VCO PCB Top.jpg
Top of unpopulated PCB
- Rev0VTx VCO Top.jpg
Populated PCB