Kenwood TM-441A User Manual
Page 29
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Some repeaters utilize a “Reverse Pair”, i.e. the transmit
/ receive frequencies are exactly the reverse of another
repeater. For example repeater A uses 146.000 for a
transmit frequency (INPUT) and 146.600 for a receiver
frequency (OUTPUT). Repeater В might use 146.600 for
a transmit frequency and 146.000 for a receiver fre
quency. It would be inconvenient to have to reprogram
the transceiver each time you wanted to use these re
peaters.
The REV/STEP key allows you to easily reverse the trans
mit and receive frequencies. To use the REV function
press the REV/STEP key. The REV indicator will turn on in
the display to remind you that you are working a re
verse pair.
To return to normal press the REV/STEP key again. The
REV indicator will turn off.
This function is also useful to check the input frequency
of the repeater so that you can determine if you are
within range for simplex communications.
5-6-3 Tone Operation
Some repeaters require the use of a control signal to ac
tivate the repeater. Several different methods are cur
rently in use.
In the United States sub-audible tones are sometimes
used. 38 different Sub-audible frequencies are possible.
In Europe a 1750 Hz tone is used in transmit. Press and
hold the Microphone 1750 key to transmit with the ac
cess tone; you need not press the PTT key.
Since this tone is required in Europe and the United
Kingdom a 1750 Hz tone encoder is included with
models delivered to these countries.
5-6-2 Reverse Function
5-6-4 Tone Frequency Selection
1. Press the F key for longer than 1 second. The F indi
cator will begin to flash. Press the TONE/T.ALT key
within 10 seconds of pressing the F key. The current
tone frequency will show in the display.
Press the key for longer than
1 second.
2. Rotate the tuning
control or press the
microphone U P / O W N
switches to select the
desired
tone
frequency.
3. Press any front panel
key to return to the
normal
frequency
display.
Tone FrequencvC Hz)
67.0
107.2
167.9
71.9
110.9
173.8
74.4
114.8
179.9
77.0
118.8
186.2
79.7
123.0
192.8
82.5
127.3
203.5
85.4
131.8
210.7
88.5
136.5
218.1
91.5
141.3
225.7
94.8
146.2
233.6
(97.4)
151.4
241.8
100.0
156.7
250.3
103.5
162.2
Note: 97.4 Hz is available
only for encode.
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