15. External Mixer Amplitude Adjustment

Adapters

Type N (f) to SMA (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1250-1772 Type N (m) to BNC (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1250-1476 Type APC 3.5 (f) to APC 3.5 (f) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5061-5311

Cables

BNC,122cm (48in) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 10503A SMA,61cm (24in) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..8120-1578

Procedure

1.Set the HP 8560A (LINE] switch off and disconnect the power cord. Remove the analyzer cover and reconnect the power cord.

2.Set up the equipment as illustrated in Figure 2-18. Do not connect the SMA cable to the HP 8560A.

3.Move the WR PROT/WR ENA jumper on the A2 Controller assembly to the WR ENA position. Set the HP 8560A luNE) switch on.

4.On the HP 8560A, press (AUX) EXTERNAL MIXER AMPTD CORRECT , then

CNV LOSS VS FREQ .

5. On the HP 8560A, press LCAL), MORE 1 OF 2, SERVICE CAL DATA, 3RD IF AMP, and

CAL 3RD AMP GAIN. Wait until the message ADJUSTMENT-DONE appears in the active function block.

Note

Perform the following steps only if the HP 8560A does not have Option 002.

6.Press @ or @ to display the conversion loss value for each frequency listed in Table 2-12. Record any conversion loss reading not equal to 30 dB in Table 2-12 at the appropriate frequency.

7.If all conversion loss values equal 30 dB, skip to step 8, otherwise continue to step a.

a.Refer to Table 2-12 and press II] or II] to select a frequency at which the conversion loss value does not equal 30 dB.

b.Use the analyzer front-panel keys to set the conversion loss value to 30 dB.

c.Repeat steps a and b for all frequencies having a conversion loss value other than 30 dB.

8.Press [INSTR PRESET) on the HP 8340A/B and set the controls as follows:

CW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310.7 MHz POWERLEVEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30 dBm

2-58 Adjustment Procedures