Agilent Technologies 856290216 service manual Sampling Oscillator PLL Divide Numbers

9.If the signal is not measured near the indicated power, troubleshoot the offset lock loop buffer (function block AM of Al5 RF schematic sheet 3 of 4).

Table 11-6. Sampling Oscillator PLL Divide Numbers

	sampling	Center	Reference		Reference
	Oscillator	Frequency*	Divide		Frequency
	Frequency	(MHz)	Chain		(MHz)
	(MHz)
			Prescaler	Postscaler
285.000		2156.3	10	2	15.000
286.364		2176.3	1 1	2	13.636
287.500		2199.5	8	3	12.500
288.462		2230.3	13	2	11.538
288.888		799.3	9	3	11.111
290.000		2263.3	10	3	10.000
290.909		2282.3	11	3	9.091
291.666		2302.3	9	4	8.333
292.500		2155.3	8	5	7.500
293.478		2158.3	23	2	6.522
294.444		2336.3	9	6	5.556
295.000		2196.3	10	6	5.000
296.000		1.3	15	5	4.000
296.471		2378.3	17	5	3.529
297.000		2410.3	20	5	3.000
297.222		2422.3	18	6	2.778

1’ To set the sampling oscillator to a desired frequency, set span to 0 Hz and CENTER FREQ to the value listed in the table.

10. Measure the 296 MHz loop feedback signal at the following test point:

A15TP400 +2 dBm

11.If the feedback signal is not near the indicated power, measure the signals at the following test points on the feedback path. Refer to function blocks AD, AG, and AH of Al5 RF schematic.

A15TP200	+4 dBm
A15TP201	+9 dBm
A15TP202	+5.5 dBm

12.Measure the 4 MHz loop-IF signal at the mixer output. The frequency of the IF is the same as the reference frequency and can be found in Table 11-6.

A15R447 (end nearest L414) - 6 dBm

Synthesizer Section 11-21