148 NW ST manual 3.3 6/15/99 3:12 PM Page 18
Operation
Operation
Calibrate For
SWR (Standing
Wave Ratio)
Note
SWR calibration is done to prop- erly adjust the length of the antenna and to monitor the quality of the coaxial cable and all RF connections.
This calibration is critical in order to achieve optimum per- formance.
Calibrate for SWR (Standing Wave Ratio)
1Select 
channel 20.
4 | While holding mic |
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| button adjust the |
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| SWR CAL knob so the |
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| meter needle swings |
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| to the CAL ▼ mark on |
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| the meter (located on the right). If optimum | |
| signal is not achieved (less than 3) a slight | |
| adjustment to the length of the antenna must | |
| be made. Recalibrate. | |
5 | Repeat the same steps on Channel 1 and 40. | |
6 | Continue holding the mic button and turn the | |
Note
Calibration must be made in an open area (never in a garage). Vehicle doors must be closed. No one should be standing near the antenna.(See your antenna directions for more complete information).
Note
The reading will be slightly high- er on Channels 1 and 40 com- pared to Channel 20.
Note
2Switch to the
CAL position.
SWR CAL knob to the SWR position for SWR |
measurement. |
When switched to SWR position the meter needle should ideally be as far to the left as possible . Anything over 3 is not accept- able. A slight antenna height adjustment (higher or lower) may be required. Repeat recali- bration step.
3Push and hold mic button.
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