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HC5
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User Manual
Rev. 1.0L - 11/02/02
9.7.1
Capacitors on the splitter circuit
1)
Remove the upper cover of the coupler
2)
Switch on the transmitter, having the exciter set on the working frequency
and at minimum power.
3)
On the coupler, set the display for the visualization of forward power.
4)
Set the variable capacitor in their middle position.
5)
Gradually increase the exciter power until the overall output power of the
transmitter reaches around the 80% of its nominal power.
6)
Adjust the variable capacitors (1) and (2) (Figure 9.1) related to the first
amplifier, to maximize the forward power measured in the coupler
Figura 9.1
7)
Adjust the variable capacitors (3) and (4) related to the second amplifier, still
maximizing the forward power measured by the coupler.
8)
Adjust the variable capacitors (5) and (6) related to the third amplifier, still
maximizing the forward power measured by the coupler.
9)
Adjust the variable capacitors (7) and (8) related to thefourth amplifier, still
maximizing the forward power measured by the coupler.
10) Adjust the variable capacitors (9) and (10) related to the fifth amplifier, still
maximizing the forward power measured by the coupler.
11) Repeat steps 6 and 10 until the transmitter’s power reaches a value that
cannot be further rised.
12) Increase the exciter power and verify that the system can reach the station’s
nominal power.
13) Switch off the transmitter.
14) Put in place again the coupler’s upper cover.
Notes:
•
The described procedure is the one optimized to adjust the coupler to work on
a certain channel (frequency). When the coupler has to be adjusted on the
whole FM band, start executing the procedure at 98.0 MHz, and then repeat it
at 87.5 MHz and 108.0 MHz, until the best tradeoff is met.
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5
3
1
10
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6
4
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Summary of Contents for HC5
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