Bench Alignment - Pico Macom 72H Installating And Operation Manual

BENCH ALIGNMENT

I N P U T F I L T E R, O U T P U T F I L T E R, A U R A L L E V E L
1.
Do Not remove the cover. Plug in the unit to
108 to 125 Vac outlet.
2.
Set the sweep generator center frequency to
the center frequency of the desired channel.
3.
Connect the TV signal generator or the agile
modulator to the sweep generator external
marker input.
4.
Set the sweeper output level below the AGC
input range -10 dBmv for the 72* and 0 dBmv
for the *BS
5.
Adjust C11 to move the audio notch to the
upper channel edge.
6.
Coarse tune the amplifier and output filters by
adjusting C1, C3, C6, C8 and C10.
7.
Fine tune the filters by adjusting C1, C2 ,C3
and C6, C7, C8, C9 and C10 to obtain a
response similar to the figure below.
2 MHz/Div
10 dB log/ Div
6 MHz
F video
8.
Connect the sweep generator to the "Thru"
and "Out" connectors. Adjust the bandstop
thru filter C4 and C5 for a response similar to
the figure to the right.
9
6 MHz
F audio
F center
6 MHz
9.
Connect a TV signal generator to the input and
a spectrum analyzer to the strip amplifier out-
put.
10.
Adjust the front panel Aural Level to locate the
notch at the lowest frequency it will tune. Then
adjust C11 until the notch is exactly on the
audio carrier.
11.
Set the front panel RF gain AGC control to
minimum gain ( maximum AGC).
12.
Vary the input level from +4 dBmv to 30 dBmv
and verify the output level remains constant at
a level of:
LBS 54 dBmv 2 dB
72L 62 dBmv 2 dB
13.
Set the RF gain AGC control to maximum gain
(minimum AGC).
14.
Vary the input level from +12 dBmv to 40
dBmv and verify the output level remains
constant at a level of:
LBS 54 dBmv 2 dB
72L 62 dBmv 2 dB
2 MHz/Div
10 dB log/ Div
F video
F center
6 MHz
F audio