B N C C A B L E

F R E Q U E N C Y C O U N T E R

IFREOUENCY

S&Wⅈ I 2 ED STANDARD

E X T

T E S T C A B L E

SMA C A B L E

 

A I 5’J 1 0 1

AdA Jl

S K 1 1 0 2

Figure 10-2. Sampler and Sampling Oscillator Test Setup

24.At each combination, the frequency counter should measure a sampler IF of 100.2 MHz &500 Hz. (The Offset PLL’s sampling oscillator tunes to the frequencies listed in the table.) If the frequency counter does not read a sampler IF of 100.2 MHz, suspect the Al5 RF Assembly.

25.Reconnect W34 to A15A2Jl and W32 to A15JlOl.

26.If YTO unlocks only with certain center frequency and span combinations, terminate the 1ST LO OUTPUT in 50 ohms.

27.Set the HP 8560A’s CENTER FREQ and m to generate the unlock conditions.

28.Set the HP 8560A’s trigger to SINGLE.

29.Move jumper A14J23 to the TEST position.

30.Disconnect W34 from A15A2Jl and measure the power of the signal at the end of W34.

31.If the power is less than -6.5 dBm, suspect W34, A7 LODA, or All YTO.

32.Move jumper A14J23 to the NORM position.

10-6 Synthesizer Section