The CN-400 series is a high quality instrument with a unique feature which makes tedious measurements of SWR and power during antenna tests, matching and tuning of transmitters s breeze. SWR and power indicators are installed in one meter unit. One scale will indicate Forward Power, another scale Reflected Power and SWR is indicated at the crossing point of the 2 needles. This unique feature makes it possible to read Forward Power, Reflected Power and SWR all at the same time. "Without M" type meters have not meter scale illumination lamp and mounting hardware is an option.

Specifications

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OPERATION

1. Use only 50 ohm coax line for connections. This will maintain the accuracy of the meter.
2. For accurate power measurements, use 50 ohms pure resistance dummy load.
3. "Forward" scale indicates Forward Power.
4. "Reflected" scale indicates Reflected Power.

5. Effective Radiated Power

   To measure effective radiated power, subtract Reflected power from Forward Power. (Apparent loss is only produced by impedance mismatch and does not include cable losses.)

See figure 3 - The meter indicates Forward power 100W and Reflected Power 4W. At the crossing point of the two meter needles the indication is SWR 1.5.

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REMARKS

• The meter movements are highly sensitive. Prevent machanical shock and vibration.
• Measuring power with a poorly matched antenna or disconnecting the output of the bridge while operating may damage the meter.
• Connect lamp terminal to 13.8VDC Power Supply.

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How to use option (washers)

Put washers between the angle and the main body to protect against flaws.

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Schematic

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