Specifications

YTF Alignment (RYTHM and SBTX)
Agilent Technologies
PSA Series Spectrum Analyzers
Test and Adjustment Software
YTF Alignment (RYTHM and SBTX)
The instrument firmware tunes the YTF (Yig Tunable Filter) via a DAC. The relationship
between DAC value and tuned center frequency follows a 3rd order polynomial curve.
The non-linearity of this curve is enough to offset the center frequency of this filter by
several tens of MHz. This alignment calculates the coefficients of the 3rd order
polynomial.
The RYTHM YTF tunable range (2.85 GHz to 26.5GHz) is split into two different
regions:
Band 1-2-3 (2.85 GHz to 19.2 GHz) and Band 4 (18.7 GHz to 26.5 GHz).
The SBTX YTF frequency range is separated into band 5 (26.4 GHz to 31.15 GHz) and
band 6 (31 GHz to 50 GHz).
For each freq:
● The DUT is tuned to the desired Cal Freq.
● The YTF center freq is found using a SW controlled preselector center routine.
● The YTF center amplitude is found during the fine adjust.
● The associated Start Tune Dac number is found.
Required Test Equipment
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