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7-1
7 OPERATING THROUGH FM REPEATERS
Repeaters are often installed and maintained by radio clubs,
sometimes with the cooperation of local businesses involved
in the communications industry.
Comparedtosimplexcommunication,youcanusually
transmit over much greater distances by using a repeater.
Repeaters are typically located on mountain tops or other
elevated locations. They generally operate at higher
ERP (Effective Radiated Power) than a typical station.
This combination of elevation and high ERP allows
communications over considerable distances.
TX: 144.725 MHz
TX tone: 88.5 Hz
RX: 145.325 MHz
TX: 144.725 MHz
TX tone: 88.5 Hz
RX: 145.325 MHz
REPEATER ACCESS
Most repeaters use a receive and transmit frequency pair
withastandardornon-standardoffset(odd-split).Inaddition,
some repeaters must receive a tone from the transceiver in
order to gain access to the repeater. For details, consult your
local repeater reference.
Selecting an Offset Frequency
The offset frequency is the value which the transmit
frequency will be offset from the receive frequency. The
defaultoffsetfrequencyonthe144MHzbandis600kHzfor
all type versions. The default on the 430/440 MHz band is 5
MHz.
1 Select your desired band A or B.
2 Access Menu No. 140.
• Theselectablerangeisfrom00.00MHzto29.95MHz,
instepsof50kHz.
Note:
After changing the offset frequency, the new offset frequency
willalsobeusedbyAutomaticRepeaterOffset.
Automatic Repeater Offset
This function automatically selects an offset direction and
activates the Tone function, according to the frequency that
you have selected. To obtain an up-to-date band plan for
repeater offset direction, contact your national Amateur Radio
association.
1 Access Menu No. 141.
2 Select[On].
3 Press [A/B] to select the A band.
4 Press [VFO]toselectVFOmode.
5 Select your desired frequency.
6 Press [PTT] to start a call.
• Youwillbetransmittingonanoffsetfrequencyvalue
determined from your offset setting value and an offset
direction depending on your selected frequency. Refer
to the settings below for offset directions:
TH-D74A:
Under 145.100 MHz: No offset
(Simplex operation)
145.100~145.499MHz: –600kHzoffset
145.500~145.599MHz: Nooffset
(Simplex operation)
146.000~146.399MHz: +600kHzoffset
146.400~146.599MHz: Nooffset
(Simplex operation)
146.600~146.999MHz: –600kHzoffset
147.000~147.399MHz: +600kHzoffset
147.400~147.599MHz: Nooffset
(Simplex operation)
147.600~147.999MHz: –600kHzoffset
148.000 MHz and higher: No offset
(Simplex operation)
Under223.920MHz: Nooffset
(Simplex operation)
223.920~224.999MHz: –1.6MHz
225.000 MHz and higher: No offset
(Simplex operation)
Under 442.000 MHz: No offset
(Simplex operation)
442.000~444.999MHz: +5MHzoffset
445.000~446.999MHz: Nooffset
(Simplex operation)
447.000~449.999MHz: –5MHzoffset
450.000 MHz and higher: No offset
(Simplex operation)
TH-D74E:
Under 145.000 MHz: No offset
(Simplex operation)
145.600~145.799MHz: –600KHzoffset
145.800 MHz and higher: No offset
(Simplex operation)
21


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