B. 10 kHz resolution bandwidth
1. Center frequency of LC tank that loads the crystal
2. Symmetry adjustment to cancel crystal case capacitance.
3. Bandwidth
C. 3 kHz resolution bandwidth: center frequency of LC tank and bandwidth of resolution
bandwidth
D. 1 kHz resolution bandwidth: bandwidth
E. 300 Hz resolution bandwidth: bandwidth
F. Gain of all resolution bandwidth relative to the 300 kHz RES BW.
4. Digital Bandwidths (10 Hz through 100 Hz)
A. VCXO (final LO) t
uned to align digital bandwidths with crystal bandwidth center
frequency.
B. Overall gain.
C. Gain variation with input frequency.
Requirements
For the Automatic IF Adjustment routine to work, the spectrum analyzer must provide the
following basic functions:
n Power supplies
n Control signals
n
ADC
n 10 MHz Frequency Reference to the A4 Log Amp/Cal Oscillator
a
Al5 RF Assembly isolation from the RF signal during IF adjustment.
Al5 RF Assembly isolation is a function of the REDIR signal in the Al5 Flatness
Compensation Control block.
The references against which the Automatic IF Adjustment routine aligns are:
n 10 MHz reference (A15)
n Linear Scale Fidelity, especially the 10 dB gain stage in A4 Linear Amplifier block.
n 15
dB
Reference Attenuator (A5)
n A4 Log Amp/Cal Oscillator output power
IF Section 8-11
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