15. External Mixer Amplitude Adjustment (Non-Option 327)
Equipment
Synthesized sweeper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP
8340A/B
Measuring receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8902A
Power sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8481D
50 MHz reference attenuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 11708A
(supplied with HP
8481D)
Adapters
Type N (f) to SMA (f) . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1772
Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1250-1476
Type APC 3.5 (f) to APC 3.5 (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5061-5311
Cables
BNC,122cm
(48in) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A
SMA,61cm(24in)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...8120-1578
Procedure
1.
2.
3.
4.
5.
6.
7.
Press
LuNE)
to turn the spectrum analyzer off and disconnect the power cord. Remove the
spectrum analyzer cover and reconnect the power cord.
Set up the equipment as illustrated in Figure 2-24. Do not connect the SMA cable to the
spectrum analyzer.
Move the WR PROT/WR ENA jumper on the A2 controller assembly to the WR ENA
position. The jumper is on the edge of the A2 board assembly and can be moved without
folding the board down.
Press [LINE) to turn the spectrum analyzer on. On the spectrum analyzer, press
c-1,
EXT MXR
PRE
UEFR
, (UNPR),
(mCTRL),
EXTERNAL MIXER ,
BMPTD
CORRECT , then
CNV
LDSS
VS
FREq
.
Press
@
or
a
to display the conversion loss value for each frequency listed in Table 2-12.
Record any conversion loss reading not equal to 30 dB in Table 2-12 at the appropriate
frequency.
If all conversion loss values equal 30 dB, skip to step 7, otherwise continue to step a.
a. Refer to Table 2-12 and press
m
or
a
to select a frequency at which the conversion
loss value does not equal 30 dB.
b. Use the spectrum analyzer front-panel keys to set the conversion loss value to 30 dB.
c. Repeat steps a and b for all frequencies having a conversion loss value other than
30 dB.
Press (INSTR PRESET) on the HP
8340A/B
and set the controls as follows:
CWfrequency
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
310.7MHz
Power level . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30
dBm
2-58 Adjustment Procedures