TM 11-5820-801-30
(7) Increase the attenuation in CN-1367/U
reference level. (Refer to fig. 3-9.) The CN-1367/U dial
until the oscilloscope trace is at approximately the upper
indication minus 10 is the system gain in dB.
reference level but does not go above the upper
Figure 3-9. Typical Gain-Bandwidth Response of AM-6602/MSC-46(V).
Figure 3-10. Out-of-Tolerance Gain-Bandwidth Response.
(8) Measure the bandwidth between the
500 MHz minimum.
oscilloscope reference traces with FR-194/U.
(13) To measure the response of the second
(9) For
acceptable
performance,
the
stage (2A2) of the amplifier continue as follows. Set
measurements taken in steps (7) and (8) shall indicate a
toggle switch 1S5 to 2ND STG ON and set toggle switch
gain of 29.5 1 dB over the frequency band 7250 to 7750
154 to BYPASS (fig. 3-3).
(14) Vary the attenuation (from that in (10)
MHz.
For comparison, a typical gain-bandwidth
above) until the oscilloscope trace approaches the upper
measurement as displayed on an oscilloscope is
reference level (fig. 3-9). The CN-1367/U dial indication
sketched in figure 3-9. If channel gain and bandwidth
minus 10 is the second stage (2A2) gain in dB less the
are acceptable, terminate test here. Continue only if
first stage (2A3) insertion loss of 2.0 : 0.5 dB.
channel measurements are out of tolerance.
(15) The measured gain in (14) above shall be
(10) To measure the response of the first
between 12.5 dB and 14.5 dB and the bandwidth shall be
stage (2A3) of the amplifier continue as follows. Set
500 MHz minimum.
toggle switch ISS5 to BYPASS (fig. 3-3).
(16) To measure system insertion loss,
(11) Decrease the attenuation (from that set in
continue as follows. Set both IS4 and ISS to BYPASS
step
(7) until the oscilloscope trace approaches the upper
(a) Reduce the attenuation until the
reference level (fig. 3-9). The CN- 1367/U dial indication
oscilloscope
minus 10 is the first stage (2A3) gain in dB less the
second stage (2A2) insertion loss of 1.5 0.5 dB.
(12) The measured gain in step (11) shall be
between 12.5 dB and 14.5 dB and the bandwidth shall be
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