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Page Title:
Receiver Frequency, Sensitivity, and Bandwidth Test-CONT. |
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 --.----
Control settings
Performance standard
Test procedure
Equipment under test
Test equipment
Step
---
1
d. None.
d. Using the procedures in c above,
[Cont)
AN/TPM-25A
adjust
MEASUREMENT FREQ MEAS
clockwise a n d then coun-
erclockwise to determine the
upper frequency. Note this
frequency as F2.
e. None.
and center frequency as follows
(1) Bandwidth: 6.5
1
(1) Subtract frequency F1 (c
MHz.
above from frequency F2 (d
above .
(2) Center frequency: 1090
(2) Add frequencies F1 and F2
MHz
and divide the result by 2.
f. None.
f. Set AN/TPM-25A SIG GEN
FUNCTION switch to FIXED
FREQ.
1 dB.
g. Sensitivity 0
g. On the AN/TPM-25A, adjust
S U M ATTEN dial coun-
terclockwise until the test set
REJECT lamp lights, and then
clockwise until ACCEPT lamp
just lights. Note SUM ATTEN
dial reading, then add at-.
tenuation of cable connected to
PROBE input of the test set.
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