128 Chapter 6
Troubleshooting the IF Section
A10 Third Converter Assembly Description
321.4 MHz Cal Signal Mixer
The 300 MHz signal from the reference assembly (via the motherboard)
is summed with the 21.4 MHz signal received from the A8 analog IF
assembly. The 321.4 MHz calibration signal is used during the internal
Align All Now routine to calibrate the bandwidth shapes. This signal
can be turned on manually on instruments containing Option B7J. See
“Isolating the faulty assembly when the displayed amplitude is
incorrect or the instrument fails a gain related Auto Align test” on
page 53.
3rd Mixer
Down converts 321.4 MHz to 21.4 MHz. The 300 MHz LO signal is
provided by the A11 Reference assembly.
Interconnections to other assemblies
• A10J1 321.4 MHz input from A19 RYTHM
• A10J2 321.4 MHz input from A20 Lowband assembly
• A10J3 optional 321.4 MHz input, used on Option AYZ
• A10J4 to rear panel 321.4 MHz Output, or input to A33, Option H70
• A10J5 21.4 MHz to A8 Analog IF assembly
• A10J6 optional calibrator input
• A10J7 to A14 attenuator (50 MHz cal out or 321.4 MHz)
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