Procedure

Second IF Amplifier Adjustments
16. Second IF Amplifier and Third Converter Adjustment

Adapters:

Type N (f) to APC-3.5 (f) . . . . . . . . . . . . . . . . . . . . . . 1250-1745 Type N (m) to BNC (f) (2 required) . . . . . . . . . . . . . 1250-0780 Type N (f) to BNC (f) (2 required) . . . . . . . . . . . . . . 1250-1474 APC 3.5 (f) to APC 3.5 (f) . . . . . . . . . . . . . . . . . . . . . 1250-1749

Cables:

BNC to SMB Snap-On (Service Accessory) (2 required) . 85680-60093

BNC 122 cm (48 in) (3 required) . . . . . . . . . . . . . . . . . . 10503A SMA (m) to (m) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5061-5458

1.Position instrument on right side as shown in Figure 3-63, with bottom cover removed.

2.Set LINE switch to ON and press QNST PRESET] on HP 8568B, HP 8566A/B, HP 8757A, and HP 8340A/B.

3.Connect 20 dB Attenuator and power splitter to RF OUTPUT of synthesized sweeper. Connect one arm of power splitter to R input of scalar network analyzer through Detector. See Figure 3-63.

4.Set synthesized sweeper FREQUENCY MARKERS IIv11) to 291.4 MHz and (M2) to 311.4 MHz.

5.Press [cwl301.4 MHz on synthesized sweeper.

6.Connect Power meter to other power splitter port and set synthesized sweeper [POWER LEVEL) for Power Meter indication of -20.0 60.1 dBm.

7.Disconnect Power Meter and connect power splitter output to A19J1, using adapter and a BNC to SMB test cable. Refer to Figure 3-64.

8.Connect A19J2 to A input of scalar network analyzer, using adapter and another BNC to SMB test cable.

9.Connect synthesized sweeper SWEEP OUTPUT (rear panel), Z-AXIS BLANK/MKRS (rear panel), and PULSE MODULATION INPUT to proper rear-panel connectors on scalar network Analyzer, as shown in Figure 3-63.

10.On the scalar network analyzer, turn Channel 2 off and press IIVIEAS) (A/R).

11.Set scalar network analyzer [mj to 1 dB and set m (RF LEVEL) to + 14 dB. Set REF POSN (press REF POSN) to the fourth division from bottom using the data knob.

12.On synthesized sweeper, press [ml (ON) (MKR’, and IaF]. Set [SWEEP TIME] to 500 ms.

13.Adjust A19 301.4 MHz Bandpass Filter, A19C9 through C12, for the best bandpass filter response with a gain of > + 14 dBm but < + 17 dBm. See Figure 3-64 for the location of the bandpass adjustments.

Adjustments 3-l 13