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©2011 Broadcast Electronics
RF MUTE CIRCUIT. The RF mute circuit automatically inhibits exciter RF output if the AFC circuit is unlocked or if
the transmitter is not ready to accept RF drive. This circuit consists of logic input switch S3, inverters Q3 and Q4,
RF mute driver U3B, and mute switch Q2.
With S3 in the positive logic input position, U3B will output a HIGH to the base of Q2 when a LOW from a
transmitter is applied to the inverting input of U3B through Q3 and Q4. This HIGH biases Q2 ON which applies
a LOW to voltage regulator U4 compensation input to disable the RF. A HIGH from the AFC circuit (unlocked
condition) applied to U3B non-inverting input will also inhibit the RF.
FORWARD/REFLECTED AMPLIFIER CIRCUITS. The forward/reflected amplifier circuits provide information from
the directional couplers to the power control circuit and the metering circuit board. The forward amplifier
circuit consists of meter amplifier U1A, FWD CAL control R5, diode D1, and AUTO/MAN switch S1. The reflected
amplifier circuit consists of meter amplifier U1B, RFL CAL control R9, diodes D1 and D2, and VSWR indicator
driver U2A.
Forward Amplifier. Output from the forward directional coupler is applied to the non-inverting input of U1A
which operates as a voltage follower with the gain determined by potentiometer R5. The output of U1A is
routed to: 1) the metering circuit board for display, 2) a rear-panel barrier strip for remote metering, 3) diode
D1, and 4) the inverting input of voltage regulator U4 through S1.
Reflected Amplifier. Output from the reflected directional coupler is applied to the non-inverting input of U1B
which operates as a voltage follower with the gain determined by potentiometer R9. The output of U1B is
routed to: 1) diodes D1 and D2, 2) the metering circuit board for display, and 3) the rear-panel barrier strip for
remote metering.
Содержание FX-50
Страница 12: ...x 2011 Broadcast Electronics This page intentionally left blank ...
Страница 20: ...8 2011 Broadcast Electronics Figure 2 1 FX 50 E REAR PANEL CONNECTIONS SHEET 1 OR 2 ...
Страница 21: ...9 2011 Broadcast Electronics Figure 2 1 FX 50 E REAR PANEL CONNECTIONS SHEET 2 OR 2 ...
Страница 32: ...20 2011 Broadcast Electronics Figure 3 1 FX 50 E CONTROLS AND INDICATORS ...
Страница 35: ...23 2011 Broadcast Electronics Figure 4 1 FX 50 E OVERALL SIMPLIFIED SCHEMATIC ...
Страница 40: ...28 2011 Broadcast Electronics Figure 5 1 FX 50 E ASSEMBLY ...
Страница 46: ...34 2011 Broadcast Electronics Figure 6 1 CONTROL CIRCUITRY SIMPLIFIED SCHEMATIC ...
Страница 49: ...37 2011 Broadcast Electronics Figure 6 2 POWER SUPPLY SIMPLIFIED SCHEMATIC DIAGRAM ...
Страница 53: ...41 2011 Broadcast Electronics Figure 6 4 PARALLEL LOAD CONNECTION ...
Страница 56: ...44 2011 Broadcast Electronics Figure 6 5 NO PA VOLTAGE TO THE RF AMPLIFIER ...
Страница 58: ...46 2011 Broadcast Electronics Figure 7 1 METERING CIRCUIT REMOVAL AND INSTALLATION DIAGRAM ...
Страница 60: ...48 2011 Broadcast Electronics Figure 7 2 METTERING BOARD SIMPLIFIED SCHEMATIC ...
Страница 68: ...56 2011 Broadcast Electronics Figure 8 1 MODULATED OSCILLATOR SIMPLIFIED SCHEMATIC DIAGRAM ...
Страница 74: ...62 2011 Broadcast Electronics Figure 9 1 AFC PLL CIRCUIT BOARD SIMPLIFIED SCHEMATIC ...
Страница 81: ...69 2011 Broadcast Electronics Table 9 2 FREQUENCY SYNTHESIZER PROGRAMMING ...
Страница 84: ...72 2011 Broadcast Electronics Figure 9 4 NO RF OUTPUT LOCK IS EXTINGUISHED ...
Страница 85: ...73 2011 Broadcast Electronics Figure 9 5 NO MODULATION LOCK INDICATOR ILLUMINATED ...
Страница 89: ...77 2011 Broadcast Electronics Figure 10 1 RF AMPLIFIER SIMPLIFIED SCHEMATIC ...
Страница 92: ...80 2011 Broadcast Electronics Figure 10 2 RF AMPLIFIER CIRCUIT BOARD CONTROLS ...
Страница 95: ...83 2011 Broadcast Electronics Figure 10 3 RF AMPLIFIER TROUBLESHOOTING INFORMATION ...
Страница 100: ...88 2011 Broadcast Electronics Figure 11 1 SLAVE FM BOOSTER SIMPLIIFED SCHEMATIC ...
Страница 101: ...89 2011 Broadcast Electronics Figure 11 2 MASTER FM BOOSTER SIMPLIFIED SCHEMATIC ...
Страница 161: ...149 2011 Broadcast Electronics Figure 14 1 OPTIONAL LOW PASS FILTER ASSEMBLY ...
Страница 162: ...150 2011 Broadcast Electronics Figure 14 2 EXCITER FRONT RAIL MOUNTING APPLICATIONS ...
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