50
51
14. Glossary
2 m band
Mobile 2 m band radio 146 MHz - 174 MHz
ASCII
A
merican
S
tandard
C
ode for
I
nformation
I
nterchange
COM interface
Com
munication interface
CTS
C
lear
t
o
S
end
control of data transmission
Deemphasis
de-emphasis
Download
A program or file is downloaded to the radio unit.
EEPROM
E
lectrical
E
raseable
PROM
ESD
E
lectrostatic
S
ensitive
D
evices
ETS
E
uropean
T
elecommunication
S
tandard
FFSK
F
ast
F
requency
S
hift
K
eying (fast frequency modulation)
FSE
Radio transmitter / receiver
GMSK
G
aussian
M
inimum
S
hift
K
eying
coding method for data transmission
HK
H
ong
K
ong
Channel spacing
Distance between the channels in steps of 20 kHz, 12.5 kHz or 25 kHz
LED
L
ight
E
mitting
D
iode
LSB
L
east
S
ignificant
B
it
MSB
M
ost
S
ignificant
B
it
OEM
O
riginal
E
quipment
M
anufacturer
Polling
Sequential inquiry of devices to determine operational status
PWR
P
o
w
e
r
(Power level)
directional coupler
Short coaxial circuit section with a wave impedance that agrees with that one of the used wire.
A measuring loop which couples out a certain voltage either only from the wave that goes there or
from the rewinding wave, depending on the mounting direction, is positioned parallel to the inner
conductor in the wave leading interior.
RS232
R
ecommended
S
tandard
232 -
standardised serial interface
RSSI
R
eceiver
S
ignal
S
trength
I
ndicator
RTS
R
eady
t
o
S
end
control of data transmission
RX
Receiver
RXD
R
eceive
D
ata
control of data transmission
Semiduplex
Data are transmitted one after the other in two ways (between transmitter and receiver) also
called half duplex.
Simplex
Data transmission which goes in one way only (from transmiter to receiver)
Software
handshake
Communication protocol which controls the data flow between computer and modem via the
serial interface.
The data flow contains control characters (
Xon
ASCII-HEX 0x11 /
Xoff
ASCII-HEX 0x13) to stop
or start the data flow.
Squelch
Controller for volume and noise suppression
TX
Transmitter
TXD
T
ransmit
D
ata
control of data transmission
Glossary