OPERATION
TRANSMITTING
FM TRANSMISSION
A separate, dedicated “29 MHz” band is provided on the
For transmission, the only control on the front panel you need be concerned about is RF PWR. Microphone gain for FM is set via the separate FM MIC control in the top access panel, and normally needs no adjust- ment after leaving the factory. If you receive signals reports of low audio with a strong carrier, you may want to increase the gain. If you notice distortion in the trans- mit monitor, you may want to decrease it. Otherwise, we suggest leaving it alone. Remember that the ap- parent modulation level on 29 MHz will be less than you are accustomed to on VHF, due to international regulations restricting the maximum deviation to ±2.5 kHz.
All you need to do for most operation is set the METER selector to the “PO” position, and adjust the RF PWR control for the desired output while transmit- ting. If you need full power, keep your transmissions to three minutes or less, with the same time for recep- tion. Otherwise, set the power output to 100 Watts or less, and you should never encounter any duty cycle limitations.
You can use the VOX circuit for t/r switching, if de- sired, and the transmit monitor to listen to your signal. See also the FM Repeater Operation at the right.
FM Repeater Operation
Several features are available for operation on FM repeaters above 29 MHz, which typically use
To locate these repeaters, you can ask around the calling channel (29.6 MHz), or you may want to load a block of memory channels (see page 67) with
Repeater Shift - When you find a repeater, press the [RPT] button, once for
Repeater TX Offset - For repeaters not using the standard 100 kHz offfset, you can change the default offset between 0 ~ 200 kHz via menu selection
CTCSS Tone - A
Tone Type – Continuous (CTCSS) or burst tone transmission is enabled from menu selection
CTCSS TONE FREQUENCIES
67.0 | Hz | 118.8 Hz | 173.8 Hz |
71.9 | Hz | 123.0 Hz | 179.9 Hz |
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77.0 | Hz | 127.3 Hz | 186.2 Hz |
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82.5 | Hz | 131.8 Hz | 192.8 Hz |
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88.5 | Hz | 136.5 Hz | 203.5 Hz |
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94.8 | Hz | 141.3 Hz | 210.7 Hz |
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100.0 Hz | 146.2 Hz | 218.1 Hz | |
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103.5 Hz | 151.4 Hz | 225.7 Hz | |
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107.2 Hz | 156.7 Hz | 233.6 Hz | |
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110.9 | Hz | 162.2 Hz | 241.8 Hz |
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114.8 | Hz | 167.9 Hz | 250.3 Hz |
| page 59 |