Chapter 11. - Repeaters - Radioddity GA-5S User Manual

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Chapter 11. - Repeaters

A radio repeater is an automated transceiver in a fixed location. Usually mounted high up
on hilltops or on tall buildings, but sometimes they operate within buildings for internal use.
A repeater takes one signal and relays it, usually after amplifying it by orders of magnitude.
This can be very handy, as this enables you to use a small low powered hand-held two-way
transceiver such as the Radioddity GA-5S to reach great distances.
Whether you're a commercial (business or government) user or an amateur radio operator,
chances are you'll deal with a repeater system sooner or later. To find out what settings to
use to use your local repeater, ask your employer or someone at your local amateur radio
organization for details.
A common type of repeater is the duplex repeater. In a duplex repeater system, the
repeater transmits and receives simultaneously, but on different frequencies. To utilize this
type of repeater, your radio has to be capable of transmitting and receiving on different
frequencies on the same memory channel. How you use this kind of repeater is by setting
the receive frequency of your radio to the output frequency of the repeater, and the transmit
frequency of your radio to the input frequency of the repeater. Often times, the transmit
frequency to use isn't explicitly stated, but rather an offset relative your receive frequency is
specified. This is conveniently enough also how the Radioddity GA-5S natively handles
repeater set up in VFO, by specifying offset rather than transmit frequency.
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This is might cause confusion because many expect this to be true globally when
it isn't.
SFT-D and OFFSET only function in VFO mode.
MR mode uses and stores the RX frequency and the TX frequency only. SFT-D
and OFFSET don't have to be set or they can even be set completely wrong and
working repeater channel can be created
It is convenient to use SFT-D and OFFSET with 'reverse' mode to determine the
TX frequency to be stored in a channel, but they are otherwise unused for MR
mode.
The following instructions assume that you know what transmit and receive frequencies
your repeater employs, and that you're authorized to use it.
1. Set the radio to Frequency (VFO) mode with the
2. Enter the repeater's output (your receiving) frequency by either using the
Keys, or entering it directly on the numerical keypad.
3. Press the key to enter the menu.
MENU
4. Enter on the
5. Press key to select.
MENU
6. Use the and
See the section called "26 OFFSET-Frequency shift amount" for details.
Procedure 11.1. Repeater setup
key.
VFO/MR
on the numeric keypad to get to frequency offset.
keys and numeric keypad to enter the specified frequency offset.
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