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)
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)
Band 6 (31 GHz to 50 GHz)

For each freq:

The DUT is tuned to the desired Cal Freq.
The YTF center frequency 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.

This adjustment saves an output file which lists the corrections that were stored in the instrument. The output file is saved at this location:

<drive>:\Program Files (x86)\Agilent TME\PSA\Output\<Model_Serial#>

Required Test Equipment

Test Equipment	Model Number	E4440A E4443A E4445A	E4446A E4447A E4448A
Synthesized Sweeper	PSG Models (see equipment list)	X	X
Power Meter	N1914B	X	X
Power Sensor	N8485A	X
Power Sensor	N8487A		X
Power Splitter	11667B	X
Power Splitter	11667C		X
3.5 mm Cable	8120-4921	X
2.4 mm Cable	8120-6164		X
BNC Cable	8120-2582	X	X
3.5 mm (f) to 2.4 mm (f) adapter	11901B	X	X
Type-N (m) to 3.5 mm (m) adapter	1250-1743	X
3.5 mm (f) to Type-N (m) (8485A adapter)	08485-60005	X
2.4 mm (f) to Type-N (m) (8487A adapter)	08487-60001		X

YTF Alignment (RYTHM and SBTX)

Required Test Equipment

Connection Setup

Power Meter Calibration

YTF Alignment Setup