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Front End Control Troubleshooting
A15 Front End Control Description
Standard RF Assemblies Controlled by the A15:
— A9 Input Attenuator A (4 dB total)
— A10 Input Attenuator B (66 dB total)
— A11 Low Band Switch
— A12 YIG Tuned Filter
— A13 RF Front End Assembly
A15 On Board Circuits:
— RF Burst Trigger (When set to Relative Trigger or when center frequency is
< 300 MHz.)
— YTF Tune Ramp
— Preselector Tune Out (Provides output voltage, not specified, reserved for
future use)
—Mixer Bias
—Amplifier Bias
—Switch Control
— Sweep Ramp (reserved for future use)
Refer to Table 5-1 for details regarding which options are supported by the two
choices of A15 assemblies.
Table 5-1 A15 Option Related Control
Option Description Physical Location in Analyzer A15 Support
P03 Preamplifier, 3.6 GHz A15 to A13 FEC or EFEC
P08 Preamplifier, 8.4 GHz A15 to A11 FEC or EFEC
P13 Preamplifier, 13.6 GHz A15 to A11 FEC or EFEC
P26 Preamplifier, 26.5 GHz A15 to A11 FEC or EFEC
CRP Arbitrary IF Output A15 to AUX IF OUT (rear panel) EFEC
CR3 Second IF Output A15 to AUX IF OUT (rear panel) EFEC
MPB Microwave Preselector Bypass A15 to SW1 and SW2 EFEC
EA3 Electronic Attenuator, 3.6 GHz A15 to A13 FEC or EFEC
B40 40 MHz Analysis Bandwidth A15 to A3 EFEC
DP2 Digital Signal Processing &
2GB Capture Memory
A15 to A3 EFEC
B85, B1A,
or B1X
85, 125, and 160 MHz Analysis
Bandwidths
A15 to A25 EFEC
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