If RFL values displayed on the transmitter closely match the readings you obtained using the Bird power meter. This indicates that the transmitter's internal measurement is functioning correctly and consistently.
We would like to take this opportunity to suggest a broader check of the entire RF transmission path. Reflected power can be influenced by multiple factors beyond the transmitter itself. In particular, we recommend inspecting the following components for potential mismatches or degradation:
- RF cabling (length, condition, 50 Ohm and type)
- All connectors and terminations (e.g., wear, oxidation, 50Ohm compatible, or poor installation)
- The dummy load or antenna used for testing (e.g., 50Ohm impedance +- tolerance)
Typical VSWR values across RF components (dummy load, cables, connectors) can cause cumulative reflected power, even in a properly working system. Please also note that reflected power and VSWR can vary with frequency. Additionally, a low-power transmitter may show slightly higher VSWR readings compared to a high-power unit, due to sensitivity and measurement resolution differences.
Some other manufacturers choose to display “0 W” reflected power when the value is very small, often for cosmetic reasons, to make the readout appear cleaner and avoid questions about small, harmless reflections. In reality, every RF system – even when connected to a perfect dummy load – will have a small amount of reflected power due to connectors, cables, and normal tolerances.
So sometimes you show the transmitter has reflected power on the display within a safe VSWR range, and there’s no cause for concern.