5-5 TRANSMITTER ADJUSTMENTS
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| MEASUREMENT |
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| ADJUSTMENT | ||
ADJUSTMENT | ADJUSTMENT CONDITION |
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| UNIT | LOCATION |
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| UNIT | ADJUST |
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PA UNIT | 1 | • Preset R131, R135, R150, R650 (PA unit) to max. counter clockwise. |
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PRESETTING |
| • Preset R3, R138, R503 (PA unit) to center position. |
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| • Preset C154, C659 (PA unit) to center position as illustration at right. |
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IDLING | 1 | • Display frequency: |
| PA | Connect an ammeter | At the point where the PA | R131 | |||||||
CURRENT |
| [EUR], [KOR] |
| 145.0000 MHz | (3 A) between power | TX current increases |
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(for 144 M) |
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| 146.0000 MHz | supply and the IC- | 0.5 A. |
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| • Mode | : CW | 910H. |
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•Transmitting
| 2 | • Transmitting |
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| At the point where the |
| R135 | |
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| TX | current increases |
| (R138) |
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| 1.0 A as step 1. |
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| 3 | • Transmitting |
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| At the point where the |
| R650 | |
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| TX | current increases |
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| 0.5 A as step 2. |
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(for 430 M) | 4 | • Display frequency: |
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| At the point where the |
| R150 | ||||
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| [EUR], [KOR] | 435.0000 MHz |
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| TX | current increases |
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| 450.0000 MHz |
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| 1.0 A. |
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| • Mode |
| : CW |
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| • Transmitting |
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RF PEAK | 1 | • Display frequency: 440.0000 MHz | Rear | Connect | an | RF |
| Maximum output | PA | L1, L2 | |||
(for 430 M) |
| • Connect an SSG to P1 on the PA | panel | power meter to [UHF |
| power |
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| unit via the JIG cable (A) and set as: |
| ANT] connector. |
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| Frequency : 10.850 MHz |
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| Level | : 18 mV* |
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| Modulation : OFF |
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| • Transmitting |
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| 2 | • Set an SSG as: |
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| C154 | |
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| Level | : 0.79 µV* |
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| • Transmitting |
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(for 144 M) | 3 | • Connect an SSG to P501 on the PA |
| Connect | an | RF | Refer page | ||||||
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| unit via the JIG cable (A) and set as: |
| power meter to [VHF |
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| Frequency : 10.850 MHz |
| ANT] connector. |
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| Level | : 18 mV* |
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| Modulation : OFF |
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| 4 | • Display frequency: 146.0000 MHz |
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| Maximum output | PA | C659 | |||
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| • Set an SSG as: |
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| power |
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| Level | : 0.79 µV* |
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| • Transmitting |
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IF PEAK | 1 | • Display frequency: Any | MAIN | Connect an RF volt- |
| Maximum level | MAIN | L2, L3 | |||||
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| • Mode |
| : USB |
| meter to check point |
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| • MIC gain |
| : Center |
| J51 via the JIG cable |
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| • Connect an audio generator to |
| (B). |
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| [MIC] connector and set as: |
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| Frequency |
| : 1.5 kHz |
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| Level |
| : 2 mVrms |
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| • Transmitting |
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CARRIER | 1 | • Display frequency: Any | MAIN | Connect a spectrum | Minimum carrier level | MAIN | R206, | ||||||
SUPPRESSION |
| • Mode |
| : USB |
| analyzer | to | check |
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| R215 | |
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| • Mic gain |
| : Minimum |
| point J51 via the JIG |
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| • Apply no audio signals to [MIC] |
| cable (B). |
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| connector. |
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| • Transmitting |
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| 2 | • Mode |
| : LSB |
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| • Transmitting |
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| 3 | • Repeat step 1, step 2 several times. |
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5 - 8