Xmt Crystal Oscillator Frequency Correction - Alcatel MDR-8000 User Manual

XMT CRYSTAL OSCILLATOR FREQUENCY CORRECTION

5.14
PURPOSE
See Figure 5 - 19 and follow the procedure to correct the transmit frequency of the crystal
oscillator on the UD-35( ) Transmitter module.
Allow a 1-hour warm-up period for radio and test equipment before starting applicable
tests or improper frequency adjustment can result. If waiting for initial alignment is
impractical, it may be performed after a warm-up period of 5 minutes minimum; however,
crystal frequency should be rechecked after full warmup.
XMT LVL
ADJ
PWR MON
FREQ CONT
XMT PWR
ALM
ON LINE
I CARR NULL
Q CARR NULL
TRANSMITTER
XTAL
MON
RF
MON
RF
OUT
Figure 5 - 19 XMT Crystal Oscillator Frequency Check
Connect Frequency Counter to XTAL MON connector.
a
Verify XMT LO frequency indicated on Frequency Counter
b
is crystal reference frequency ± 3 parts per million. If not,
adjust Freq Cont.
c Check/adjust Carrier Null using Spectrum Analyzer
(Paragraph 5-17) or DVM (Paragraph 5-18).
FREQ
COUNTER
MDR-1053
09/08/05
5-41