Parameters Adjusted
The following IF parameters are adjusted in the sequence listed:
1.Amplitude
A.Video Offsets: analog (using A4 Log Amplifier video offset DAC) and digital (applying stored constant to all readings)
1.Linear Scale Offset
2.Log Scale Offset
a.Wideband and Narrowband modes.
b.0 to 60 dB range in 10 dB steps.
c.10 dB/DIV and 2 dB/DIV (log expand) modes. B. Step Gains (A5 IF Assembly)
1.First Step Gain for 16 different DAC settings.
2.Second Step Gain for 16 different DAC settings.
3.Third Step Gain for 0, 15, and 30 dB attenuation relative to maximum gain.
4.Fine Attenuator for 32
1.Wideband (RES BW 300 kHz through 2 MHz) and Narrowband modes (RES BW 300 Hz through 100 kHz)
2.10 dB/DIV and 2 dB/DIV (log expand) modes
D.Linear Scale Gains - On A4 Log Amplifier Assembly
E.Peak Detector Offsets (both Positive and Negative Peak Detectors with respect to normal sample path used by Auto IF Adjust)
2.LC Bandwidths
A.300 kHz resolution bandwidth center frequency, bandwidth, and gain.
B.1 MHz resolution bandwidth center frequency, bandwidth, and gain. C. 2 MHz resolution bandwidth gain.
D.100 kHz resolution bandwidth center frequency, bandwidth, and gain.
E.30 kHz resolution bandwidth center frequency, bandwidth, and gain. F. Gain of all resolution bandwidth relative to the 300 kHz RES BW.
3.Crystal Bandwidths
A.The A4 Cal Oscillator sweep rate is measured against the 100 kHz resolution bandwidth filter skirt. This result is used in compensating the sweeps used for adjusting the crystal bandwidths.