Installation guide

Troubleshooting
Troubleshooting Unlevels and the RF Path
1-78
Unleveled or Low Power for Frequencies > 4 GHz and ≤ 6 GHz (Option 506 Only)
NOTE Before proceeding to troubleshoot with this section, run a full self-test and correct any reported
failures and unlock problems. (Refer to “Self-Test Failures and Related Troubleshooting” on
page 1-19 and “Troubleshooting Unlocks” on page 1-68.)
1. Set the signal generator to the unleveled frequency.
2. With the signal generator powered on, carefully remove
the A14 Extended Frequency Output (Option 506).
3. Use a semi-rigid cable extender and connect a spectrum analyzer to the A22 Coupler (Option 506) on the
coupled output at J4 of the A14 Extended Frequency Output (Option 506).
The signal at J4 should be the same frequency that the signal generator is set to and the amplitude at J4
should be ≥ - 8 dBm.
• If the J4 signal is good, replace the A14 Extended Frequency Output (Option 506).
• If the J4 signal is bad, measure the signal at the cable (W54) connected to the input
of the A22 Coupler (Option 506).
— If the signal is good, change the A22 Coupler (Option 506).
— If the signal is bad, check the signal leaving the YIG Oscillator.
The YIG frequency will be the same as the front panel frequency.
— If the signal is good, replace the semi-rigid cable (W54) between the YIG Oscillator and the input
of the A22 Coupler (Option 506).
(Refer to “Option 506 - Semi-Rigid Cables includes the A21 YTO Driver (Option UNJ or Option
506) and the AT1 High-Power Mechanical Attenuator (Option UNB) with an A29 DC Blocking
Capacitor (Option 506)” on page 3-65.)
— If the signal is bad, change the A21 YTO Driver (Option UNJ or Option 506).