User's Manual

Universal Metering Transponder for kV2c™ Meter User Guide 27
Chapter 2 • Functional Description
Figure 2.4 RF operation block diagram
The EMTR-3 KV transmits and receives internally stored data using 79 channels
spaced equally across the 902 MHz - 928 MHz band. Channel 1 is at 902.628
MHz, and Channel 79 is at 927.789 MHz. The EMTR-3 KV is primarily a receiver,
but transmits 5-second replies to the Hand Held Transceiver (HHTR) installation
tool during initial installation of the meter. The EMTR-3 KV operates under
Paragraph 15.249 of FCC Regulations and employs frequency shift keying (FSK)
to convey data. No subcarriers are used.
HHTR Data
RF = PIC
18
LF
242
902 -928
MHz
UI = PIC
18
LF
6720
8
MHz
7.2
V NiMH
1600
mAH
Regulated to
5
V and
3.3V
EMTR-3 KV Data
Orion Dat
a
916 .45
MHz
Data Rate =
100
kbps
2-
level FS
K
+/
-
50
Khz
(3
o
f
6)
Orion Transmitter
Orion Transmitter
HHTR
Handheld
Transceiver
PC
Data Transfer
from
/
to
HHTR
kV2c™ with
EMTR-3 KV
RF Interface
Orion Transmitter
Orion Transmitter
RF Operation Block Diagram
(
TWACS
-
Orion Project
)
June
22, 2007
Wire Interface to
Water/Gas Meter
Encoder
1-
way RF Link
902- 928
MHz
Bi
-
Directional
RF Lin
k
RS
-
232
Multi-port EMA provides 1 Electrical port
and 7 RF
p
orts for
g
as/water.
EMA unregulated voltage is 6V to 13V.
EMA regulated voltage is 5V.
Re
g
ulated fro
m
EMA to EMTR-3 KV is 3.3V.
PIC18F 4525
8MHz
F
CC
ID
:
P
N3
Y
7
2
553
-1
Orion Transmitter
Orion Transmitter
Orion Transmitter