Broadcast Electronics Marti Electronics ME-40, Руководство пользователя

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Table 5-6 lists standard carrier frequencies and corresponding switch binary codes for domestic
and European operation. A "1" in the code represents a switch in the ON position and a "0"
represents a switch in the OFF position. S1, S2, and S3 are programmed as follows.
Procedure to change the exciter carrier frequency; proceed as follows.
WARNING
DISCONNECT PRIMARY POWER TO THE EXCITER BEFORE PROCEEDING.
WARNING
a. Disconnect the exciter primary power.
b. Remove the exciter top-cover. Refer to the Table and select the desired frequency and
corresponding binary code.
c. Refer to Figure 5-7 and program four-segment switches S1, S2, and S3 for the desired
frequency.
d. Replace the top-cover and return the exciter to service.
Figure 5-7. Synthesizer Frequency Selection.
5.11.3.8
LOW-PASS FILTER. An optional low-pass filter can be installed on the exciter rear-panel
for stand-alone operation. Due to critical tuning parameters, field adjustment is not
recommended. If adjustment is necessary, contact Marti Electronics service for
assistance.
5.11.3.9
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