Technical data

Chapter 3 3-25

Adjustments and Correction Constants

Cavity Oscillator Frequency Correction Constants (Test 54)

The nominal frequency of the cavity oscillator is 2.982 GHz, but it varies with

temperature. This procedure determines the precise frequency of the cavity oscillator at a

particular temperature by identifying a known spur.

Analyzer warmup time: 30 minutes.

NOTE

You should perform this procedure with the recommended filter, or a filter

with at least 50 dB of rejection at 2.9 GHz, and a passband which includes

800 MHz. The filter makes spur identification substantially faster and more

reliable.

With the filter, you need to distinguish between only two spurs, each of which should be

10 dB to 20 dB (3 to 4 divisions) above the trace noise.

Without the filter, you need to distinguish the target spur between four or five spurs, each

of which may be 0.002 to 0.010 dB (invisible to 2 divisions) above or below the trace noise.

Perform the first five steps of the procedure at least once for familiarization before trying

to select the target spur (especially if you are not using a filter).

Required Equipment and Tools

Description HP/Agilent Part or Model Number

Low pass filter (used with the adapters below) 9135-0198

Adapter type-N (m) to SMA (f) 1250-1250

Adapter type-N (f) to SMA (m) 1250-1562

Power splitter 1667A Option 001

Attenuator 20 dB 8491A Option 020

RF cable set 11851B

Antistatic wrist strap 9300-1367

Antistatic wrist strap cord 9300-0980

Static-control table mat and ground wire 9300-0797