User Guide

PAMS
Technical Documentation
RAE-3
8. Troubleshooting
Page 8 – 28
Issue 1 06/01
1. Open the smaller RF shield metal can. Check Hagar RFC–out signal
at V800. It should show sine wave of 1.2V amplitude, 13MHz frequency (see
Figure 18 ).
• If this is OK, the problem is in V800 transistor or in R834, R830,
C834, L800.
Figure 18. 13 MHz sine wave
2. Check VTCXO output at R833. This should be 26MHz sine wave
(see Figure 19 ).
• If this is OK, Check R835, C830 for shorts and bad connections. If
they are OK, Hagar (N505) or C800 or R829 is faulty.
• If this is not OK,
R835, C830, R833 may be faulty. If they are OK,
check
VTCXO (G830).
Figure 19. 26 MHz sine wave