SOUTHERN AVIONICS COMPANY
Model SA100 Dual
2-73
Theory of Operation, Radiobeacon
2.4.1.1 DC Auto Disconnect PWB
The DC Auto Disconnect PWB (DCAD) is used in SAC SA Series Transmitters with power
outputs greater than 100 watts and/or ALL Dual transmitter configurations when configured with
DC option(s). The action of this PWB circumvents the low voltage cutout circuitry associated with
the DC PWB (when required) located within each RF Group. The DCAD is utilized to
automatically power down the transmitter when the external DC supply become discharged.
The DCAD operates on, and samples the 24V external DC supply voltage at TB1, pin 7. When
the external DC supply standby voltage drops below an adjustable level set by R7, the output of
U1A, pin 1 goes high, turning on Q1. This action energizes DCAD relay K1. Upon actuation of
the relay, the external DC supply supply feeding the Auto transfer system (BTTY into TB1
position 1 and out TB1 position 3) is interrupted which de-energizes the transmitter, effectively
disconnecting the transmitter load from the external DC supply. In this state, the external DC
supply will recover to approximately 23-24VDC, and continue to supply the DCAD at a 30mA rate
until AC power is re-established or the DCAD is reset.
R7 is factory adjusted to provide the disconnect at approximately 19VDC. After actuation, the
hysterisis caused by R4 and R5 keeps the transmitter powered down. The DCAD is normally
reset by the action of the AC powered external DC supply charger supplying at least 26.2VDC to
the external DC supply line. The DCAD will also reset when the external DC supply is removed
from the unit.
Содержание SA100
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Страница 36: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 6 Theory of Operation Radiobeacon Figure 2 2 Block Diagram...
Страница 39: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 9 Theory of Operation Radiobeacon Figure 2 4 KWOSYN PWB Diagram...
Страница 43: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 13 Theory of Operation Radiobeacon Figure 2 6 Tone Key PWB Diagram...
Страница 45: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 15 Theory of Operation Radiobeacon Figure 2 7 Audio PWB Schematic...
Страница 46: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 16 Theory of Operation Radiobeacon Figure 2 8 Audio PWB Diagram...
Страница 48: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 18 Theory of Operation Radiobeacon Figure 2 9 ACTRL Schematic...
Страница 49: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 19 Theory of Operation Radiobeacon Figure 2 10 ACTRL Diagram...
Страница 53: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 23 Theory of Operation Radiobeacon Figure 2 13 CRS Sample Program...
Страница 58: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 28 Theory of Operation Radiobeacon D Figure 2 17 DMOD PWB Diagram...
Страница 64: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 34 Theory of Operation Radiobeacon Figure 2 21 Filter PWB Diagram...
Страница 68: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 38 Theory of Operation Radiobeacon Figure 2 24 HWRF PWB Diagram...
Страница 70: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 40 Theory of Operation Radiobeacon Figure 2 26 AMTR Diagram...
Страница 73: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 43 Theory of Operation Radiobeacon Figure 2 29 Monitor PWB Diagram...
Страница 75: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 45 Theory of Operation Radiobeacon Figure 2 31 SA LED PWB Diagram...
Страница 82: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 52 Theory of Operation Radiobeacon Figure 2 37 DCHOKE PWB Diagram...
Страница 105: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 75 Theory of Operation Radiobeacon Figure 2 56 DC Auto Disconnect Diagram...
Страница 110: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 80 Theory of Operation Radiobeacon Figure 2 59 Modem PWB Schematic...
Страница 111: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 2 81 Theory of Operation Radiobeacon Figure 2 60 Modem PWB Assembly...
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Страница 122: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 4 2 Installation and Operation Figure 4 1 Interconnecting Wire Diagram...
Страница 123: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 4 3 Installation and Operation Figure 4 2 Input Output Terminal Blocks...
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Страница 220: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 7 2 Modifications Figure 7 1 EMI Filter Module Schematic...
Страница 221: ...SOUTHERN AVIONICS COMPANY Model SA100 Dual 7 3 Modifications Figure 7 2 EMI Filter Module Diagram...
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