Sercel VE432 DPG, Инструкция по установке и справочное руководство, Страница: 26 / 52

CONNECTING A DPG
OUTPUT SIGNAL SPECIFICATIONS
0311385 Issue : April 1999
2-14
• •
Sweep Start timing diagram
N
× 390
ms
T
DSD 1
DSD 2
status
Sweep
40 ms
200 ms
TB
F. O.
Radio delay
F. O . = Start order from recording system
N = number of T0 DATA frames ( T0 Repeat Times parameter) specified in
the T0 Time Setup on the HCI
T = approx. 580 ms for normal status.
4
Add about 270 ms for GPS information if any.
4
Add about 97
∆
t milliseconds for Time Extended QC information if enabled (i. e.
about 1 second for a 10-second sweep)
4
Add about
27
5
∆
∆
f
t
+




ms for Frequency Extended QC information if enabled
(i. e. about 0.7 s for an 80 Hz bandwidth 10 s sweep).
where
∆
t is the sweep length (seconds)
∆
f is the spectrum width (e. g. for a 20 to 80 Hz signal
∆
f =80-20 = 60
Hz).
NOTE: Time Test conditions:
-
MOTOROLA GM300 radio units
- MODEM transmission rate: 1200 bits/s.
• • VE432 RADIO INTERFACE
A G C
C169
C291
2.2
µ
F
D S D / D P G
RADIO IN
The output should be terminated
into 600
Ω
. Add a resistor in
series or parallel connection on
the radio output (RADIO XMT
line) if required.
Digital potentiometer
A G C O U T
T P 9
T P 6
T P 8
T P 5
560
Ω
R A D I O C O M
R A D I O P T T
R A D I O R C V
R A D I O X M T