kg7vfo:start
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| kg7vfo:start [2025/12/28 18:52] – admin | kg7vfo:start [2026/01/13 15:52] (current) – external edit 127.0.0.1 | ||
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| * **Task:** Verify continuity across the Mode switch wafers for each setting. | * **Task:** Verify continuity across the Mode switch wafers for each setting. | ||
| * **Focus:** Inspect the bias resistors connected to the FM/AM-1 positions for signs of thermal drift. | * **Focus:** Inspect the bias resistors connected to the FM/AM-1 positions for signs of thermal drift. | ||
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| + | ===== AM-1 vs. AM-2 Operational Differences ===== | ||
| + | * **AM-1 (Low Power):** Designed for a "dead key" carrier of ~100W; used for tuning or low-drive AM. | ||
| + | * **AM-2 (High Power):** Enables full plate current for maximum RF swing; requires high airflow. | ||
| + | * **Switching Logic:** Changes the bias voltage on the 4CX250B grids and may switch plate voltage taps. | ||
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