TB 9-6625-2340-35
(49) Press TI MARKER PRESEL PEAK key and wait for (PEAKING!) on TI crt to
disappear.
(50) Press TI keys as listed in (a) through (f) below:
(a) SCALE LIN.
(b) SHIFT, AUTOA.
(c) REFERENCE LEVEL, 15, -dBm.
(d) FREQUENCY SPAN, 0, Hz.
(e) VIDEO BW, 30, Hz.
(f) MARKER NORMAL.
(51) The marker amplitude indicated on TI display should be > -50 dBm.
(52) Press TI MARKER ∆ key.
(53) Change signal generator No. 3 output level to 1 dBm.
(54) Adjust signal generator No. 3 output level for a -5.00 0.02 dBm indication on
measuring receiver.
(55) Press TI REFERENCE LEVEL, 5, and -dBm keys.
(56) Record the marker amplitude indicated on TI display in Displayed Amplitude
column of table 51.
Measuring receiver
Test
indication
instrument
Level
Reference level
Displayed amplitude
(dBm)
(dBm)
(dBm)
-5
-5
(57) Calculate gain compression using the formula below. Calculated value will be
within the limits specified in table 52
Amplitude @ -15 dBm - amplitude @ -5 dBm = gain compression
Calculated Gain Compression (dBm)
Min
Max
-1
1
(58) Disconnect power splitter from TI RF INPUT.
(59) Connect TI RF INPUT to TI CAL OUTPUT.
(60) Press TI keys as listed in (a) and (b) below:
(a)
RECALL, 8.
(b)
MARKER PEAK SEARCH.
(61) Adjust TI AMPTD CAL for a marker amplitude of -10.00 0.02 dBm as
indicated on the TI display.
b. Adjustments. None