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©2011 Broadcast Electronics
Procedure. To change the exciter carrier frequency, proceed as follows.
WARNING
DISCONNECT EXCITER PRIMARY POWER BEFORE
PROCEEDING.
WARNING
A. Disconnect the exciter primary power.
B. Remove the exciter top-cover. Refer to Table 9-2 and select the desired frequency and corresponding
binary code.
C. Refer to Figure 9-3 and program four-segment switches S1, S2, and S3 for the desired frequency.
D. Replace the top-cover and return the exciter to service.
9.7.8
LOW-PASS FILTER.
An optional low-pass filter can be installed on the FX-50/E exciter rear-panel for stand-alone operation. Due to
critical tuning parameters, field adjustment is not recommended. If adjustment is necessary, contact Broadcast
Electronics field service for assistance.
9.7.9
PRE-EMPHASIS SELECTION.
Programmable jumpers P5A and P5B on the AFC/PLL circuit board establish the exciter pre-emphasis. The exciter
is normally shipped with 75 microsecond pre-emphasis. If required, an alternate pre-emphasis can be selected
as follows.
Procedure. To select an alternate pre-emphasis, refer to Figure 9-2 as required and proceed as follows:
WARNING
DISCONNECT EXCITER PRIMARY POWER BEFORE
PROCEEDING.
WARNING
A. Disconnect the exciter primary power.
B. Remove the exciter top-panel.
C. Refer to the following information and program P5A and P5B as required.
PRE EMPHASIS
P5A
P5B
75 us
Install
Install
50 us
Remove
Install
25 us
Install
Remove
D. Replace the exciter top-panel.
9.8
TROUBLESHOOTING.
The troubleshooting philosophy for the AFC/PLL circuit board consists of isolating a problem to a specific circuit.
The problem may be further isolated by referencing the following information and Figure 9-5 and Figure 9-6
which present troubleshooting information.
Содержание FX-50
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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 ...
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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 ...
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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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