Assessments - 2, GPA: 4.5
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Reverse Function 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 B might use 146.600 for a transmit frequency and 146.000 for a receiver frequency. It would be inconvenient to have to reprogram the transceiver each time you wanted to use these repeaters. The REV key allows you to easily reverse the transmit and receiver frequencies. To use the REV function press the REV key. The R indicator will turn on in the display to remind you that you are working a reverse pair. To return to normal press the REV key again. The R 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. 4-6-3. Tone and CTCSS operation Some repeaters require the use of a control signal to activate the repeater. Several different methods are currently in use. In the United States sub-audible tones are sometimes used. 38 different Sub-audible frequencies are possible. With the use of the optional CTCSS unit (TSU-7) you will be able to operate in a Tone Operated Squelch Mode. When this option is installed and the CTCSS function has been activated the radio will not open squelch until the proper PL tone is received. In Europe and United Kingdom a 1750 Hz tone is used in transmit. Press and hold the 1750 / LAMP switch to transmit with the access tone, you need not press the PTT switch. Since this tone is required in Europe and the United Kingdom a 1750 Hz tone encoder is included with models delivered to these countries. • Tone Frequency Selection 1. Press the F key. The F indicator will begin to flash. Press the TONE / CTCSS key within 10 seconds of pressing the F key. The current tone frequency will show in the display. 2. Rotate the Tuning control to select the desired tone frequency. 3. When the desired tone frequency is selected, the previous mode is resumed 10 seconds after selection or when the TONE/CTCSS key is pressed. Tone Frequency(Hz) 67.0 82.5 97.4 114.8 136.5 162.2 192.8 233.6 71.9 85.4 100.0 118.8 141.3 167.9 203.5 241.8 74.4 88.5 103.5 123.0 146.2 173.8 210.7 250.3 77.0 91.5 107.2 127.3 151.4 179.9 218.1 79.7 94.8 110.9 131.8 156.7 186.2 225.7 • Tone/CTCSS Operation Press the TONE / CTCSS key and select the desired Tone mode. When the T indicator appears in the display the transmitter will transmit the desired tone. When the CTCSS indicator appears in the display the transceiver will transmit the desired tone and will also operate in the Tone Squelch mode, i.e. squelch will not open until the same tone is received as a portion of the incoming receive signal. When no indicator is on the radio will not make use of either tone feature. 4-6-4. Autopatch Operations (U.S.A. versions only) Some repeaters offset a service known as autopatch. This feature allows you to dial a telephone number from your transceiver and carry out a telephone conversion, much like a care telephone, or cellular telephone. This function requires the use of a DTMF (Dual Tone Multi Frequency) pad. In addition to the 33 normal 12 keys that are found on your telephone the transceiver also provides 4 additional keys, A, B, C and D. These keys are required by some repeater systems for various control operator of your repeater to determine if their use is required. A chart is provided that lists the various tone frequencies that are generated by the keypad. (Fig. 1) To activate the keypad: 1. Press and hold the PTT switch. 2. Press the keys just like you would dial you telephone at home._ Note Some repeaters will require the use of a special key sequence to activate the autopatch function. You should check with your control operator for this sequence. Note If one of the keys is pressed after the F key has been pressed during transmission, a single tone will be heard. (Fig. 2) 34 Fig. 1 Fig. 2 I 697Hz 2 770Hz 3 852Hz А 4 941Hz 5 1209Hz 6 1336Hz В 7 1477Hz 8 1633Hz 9 С * 0 # D 4-7. CHANNEL DISPLAY MODE Channels can be shown on the display. (Ex.) 1. Enter the desired operating frequency into memory, (o* 4-4-4. Memory Entry, 4-4-8. Automatic Memory Initialization) 2. Turn off the transceiver POWER switch. 3. If you press and hold the MONI switch while you turn on the POWER switch. To return to the frequency mode, repeat the same operation (steps 2 and 3 above). POWER OFF Note In the channel display mode only the following functions are valid: • MONI, PTT, LAMP switch, F key • Functions shaded I 1 in the table below. Г | Key | (ISec) Ш 1 Key 1 [f] (ISec) 1 Key J ! Key | + Power On MHz MHz SCAN STEP MHz SCAN AUTO MEMO VFO VFO SCAN M. SHIFT V/M SCAN VFO RESET MR M.SCAN M. IN LOCK OUT M. CLR T.ALT BEEP TO/CO SAVE CALL CALL SCAN iCALL IN V/M/C SCAN A. P. 0 REV SHIFT DELAY UPPER SET SHIFT DTS...
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