3-26 Chapter 3
Adjustments and Correction Constants
Cavity Oscillator Frequency Correction Constants (Test 54)
Cavity Oscillator Frequency Correction Constants (Test 54)
Required Equipment and Tools
Analyzer warm-up time: 30 minutes.
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.
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).
Description HP/Agilent Part or Model Number
Low-pass filter 9135-0198
Antistatic wrist strap 9300-1367
Antistatic wrist strap cord 9300-0980
Static-control table mat and ground wire 9300-0797
Additional Equipment for 50Ω Analyzers
Adapter: (2) Type-N (m) to APC-7 (8753ET) 11525A
Adapter: APC-7 to 3.5 mm (m) 1250-1746
Adapter: APC-7 to 3.5 mm (f) 1250-1747
RF cable set: APC-7 11857D
Additional Equipment for 75Ω Analyzers
Adapter: APC-3.5 (f) to Type-N (f) 1250-1745
Adapter: APC-3.5 (m) to Type-N (f) 1250-1750
RF Cable Set: 50Ω, Type-N 11851B
Minimum Loss Pad: 50Ω to 75Ω (2) (75Ω
analyzer)
11852B
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