Symmetricom TM7000 User Manual

OPTION DESCRIPTIONS
J2 DC Level Shift Output (74HC type)
Level: TTL/CMOS compatible
Load: 6 mA sink
1.4 ADJUSTMENTS
Phase: While observing the modulated output (J1) on an oscilloscope, adjust R14 for minimal
discontinuity at the modulation points.
Ratio: While observing the modulated output (J1) on an oscilloscope, adjust R15 for the desired
ratio. The standard modulation ratio for IRIG time codes is 3:1.
Levels: While observing the modulated output (J1) on an oscilloscope, adjust R16 for the desired
level. The standard amplitude for most applications is 3 V p-p (modulated carrier), which is
approximately
1 V RMS.
R21 R18 R19 R20
C11
R17
Q1
C10
R15
R16
R14
J1
J2
TP2
TP1
R11
R6
Symmetricom, Inc. TM7000 TymMachine TCG/T (Rev D) A-29

Symmetricom TM7000 Specifications

General

Brand	Symmetricom
Model	TM7000
Category	Electronic dictionary
Language	English