Kenwood TM-451A - Manual (Page 55)

OPERATING THROUGH REPEATERS
Compared to simplex communication, you can usually
transmit over much greater distances by using a
repeater. Repeaters are typically located on a mountain
top or other elevated location. Often they operate at
higher ERP (Effective Radiated Power) than a typical
base station. This combination of elevation and high
ERP allows communications over considerable distances.
Repeaters are often installed and maintained by radio
clubs, sometimes with the cooperation of local
businesses from communications industries. During
natural emergencies, repeater networks can be a
valuable aid to officials responsible for coordinating
communications in a community. This assistance may
help save lives.
TRANSMIT OFFSETS
All Amateur Radio voice repeaters use a separate
receive and transmit frequency. The transmit frequency
may be higher or lower than the receive frequency but
the difference in frequencies will be a standard amount,
or "standard split". Most repeater configurations fall intc
one of the following categories:
Offset
Direction
TM-251A/E TM-451A TM-451E
+ 600 kHz + 5 MHz ■+•1.6 MHz
- - 600 kHz -5 MHz -1.6 MHz
— N/A N/A -7.6 MHz
N/A ; Not applicable
1
Whether using VFO mode. Memory Recall, or the Call ■
channel, the transmit offset direction and amount can be;
changed on the Main band. If using a split memory
channel or split Call channel. Transmit Offset cannot bei
changed. No offset settings can be made for the Sub­
band since it cannot be used for transmitting.
48