Per-unit factory sweep report
VHF-DP-6-6
6" 6-cavity VHF duplexer (BPBR) · 136–175 MHz
Serial
VHF-DP-6-6-2026-0428
Sweep date
2026-05-01
Methodology
- Reference
- VNA, 50 Ω, calibrated SOLT
- Ambient
- 25 °C ±1 °C
- Span / step
- 130–180 MHz · 25 kHz
- Tx tuned to
- 162.412 MHz
- Rx tuned to
- 167.412 MHz
- Operator / station
- Lab-3 · K. Aydın
Pass / fail summary
- Tx-Rx isolation spec > 85 dB · measured 87.4 dB
- Insertion loss (Tx) spec < 1.80 dB · measured 1.61 dB
- Insertion loss (Rx) spec < 1.80 dB · measured 1.72 dB
- Return loss (worst) spec > 18 dB · measured 21.3 dB
- VSWR (worst) spec < 1.50 · measured 1.18
Measured response · S21
freq → MHz · vertical → dBTrace files (S2P, Touchstone v1.0) included on the USB shipped with the unit.
Per-cavity tuning record
| Cavity | Role | f0 (MHz) | Q (loaded) | Notch depth | Tuning rod (turns) |
|---|---|---|---|---|---|
| C1 | Tx pass | 162.412 | 4 280 | — | +3.2 |
| C2 | Tx pass | 162.418 | 4 210 | — | +3.0 |
| C3 | Tx notch | 167.412 | 4 350 | -26.3 | +2.7 |
| C4 | Rx notch | 162.412 | 4 330 | -26.1 | +2.6 |
| C5 | Rx pass | 167.405 | 4 240 | — | +3.1 |
| C6 | Rx pass | 167.418 | 4 270 | — | +3.0 |