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Transmit offsets, Operating through repeaters – Kenwood TM-451A User Manual

Page 55

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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.

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