According to the provided reference, an SWR reading somewhere between 2.0 and 3.0 is considered too high, indicating that your system is not correctly tuned.
Understanding High SWR (2.0-3.0)
When you measure the Standing Wave Ratio (SWR) of your radio system, you are essentially checking how efficiently power is transferred from your transmitter to your antenna. An SWR of 1:1 is ideal, meaning all power is transmitted. As the SWR number increases, more power is reflected back towards your transmitter, which can cause issues.
Based on the information provided:
- SWR between 2.0 and 3.0: This range falls into the category of being too high.
- What it means: Achieving an SWR in this range signifies that your system "is not tuned correctly and needs to be dialed in better."
Causes of High SWR
The reference highlights key factors that can lead to SWR readings between 2.0 and 3.0:
- Poor System Tuning: The primary reason mentioned is that the system is simply not tuned correctly. This involves adjusting components like the antenna length or using tuning devices (like an antenna tuner) to match the impedance of the antenna system to the radio.
- Poor Antenna Location: "Another major factor that can lead to such high SWR readings is the poor location for mounting your CB antenna." The placement of the antenna relative to the vehicle or surrounding objects significantly impacts its performance and SWR.
Implications and Solutions
Having an SWR between 2.0 and 3.0 is problematic as it indicates inefficient power transfer and can potentially stress your radio's final amplifier stage over time due to reflected power.
To address an SWR in the 2.0 to 3.0 range, based on the reference, you need to:
- Improve System Tuning: Adjust the antenna or related components to achieve a better match.
- Evaluate Antenna Location: Consider if the mounting location is causing the high SWR and potentially relocate the antenna for a clearer radiating path.
Here's a simple breakdown based on the reference:
| SWR Range | Status | Indication | Action Advised (Based on Reference) |
|---|---|---|---|
| 2.0 - 3.0 | Too High | System not tuned correctly | Needs to be dialed in better; Check antenna location |
| > 3.0 | Potentially Higher | Significant tuning/system issues | Requires immediate attention to prevent damage |
| < 2.0 | Acceptable/Good | System generally well-tuned | Requires minor or no adjustment |
| 1.0 - 1.5 | Excellent | Near-perfect match, highly efficient | Optimal performance |
Note: The table includes ranges beyond 2.0-3.0 for context based on general knowledge, but the reference specifically labels the 2.0-3.0 range as "too high" and requiring correction.
In summary, an SWR reading between 2.0 and 3.0 is explicitly identified as too high by the reference, necessitating adjustments to tuning or antenna placement.
