6 COMMUNICATING
FM TRANSMISSION | FM REPEATER OPERATION |
FM operation on HF frequencies solves the problem of how to have long distance voice communication with the finest audio quality. When combined with the
Refer, if necessary, to ÒOPERATING BASICSÓ beginning on page 19 for complete receiving details for any mode.
Note: Switch ON Menu No. 12
1Select the operating frequency.
2Press [FM/AM] to select FM mode.
AGC AUTO
FM
3Press [MONI] to switch the Monitor function ON.
Compared to the usual simplex method of FM communications on HF, which is radio to radio with antennas at or slightly above average terrain, you can often transmit much farther through repeaters.
Repeaters are typically located on a mountain top or other elevated location. Most often they operate at a higher ERP (Effective Radiated Power) than the average mobile or fixed amateur station. This combination of elevation and high ERP allows communications over wider and longer distances than can be achieved by the average station.
HF repeaters operate only in the 29 MHz FM
Note: Switch ON Menu No. 12
29.520 MHz |
|
88.5 Hz | 29.620 MHz |
|
¥ÒMONIÓ lights.
4Press and hold down the Microphone [PTT] switch, or press [SEND].
¥The ÒON AIRÓ indicator lights.
¥Refer to ÒVOXÓ {page 45} for information on automatic TX/RX switching.
5Speak into the microphone.
¥FM microphone gain can be switched between low (L) or high (H) via Menu No. 61 (FM MIC). The default is low (L). Low is usually appropriate; however, select high if the monitored audio or reports from other stations indicate that your audio is weak. The Front Panel MIC gain control has no affect in the FM mode.
¥Speak in a normal tone and level of voice. Speaking too close to the microphone, or too loudly, may increase distortion and reduce intelligibility.
¥The CAR control does not need to be adjusted since the carrier level is fixed at the best setting for the FM mode.
6Release the Microphone [PTT] switch, or press [SEND] again, to return to the receive mode.
¥The ÒON AIRÓ indicator goes out.
Note:
◆When using the optional
◆When the target station is using FM
29.620 MHz | 29.520 MHz |
| 88.5 Hz |
¥The VFO selected in this step will be used for the transmit frequency.
2Select the transmit frequency.
3Press [FM/AM] to select FM mode.
AGC AUTO
FM
4Press [A=B].
¥This must be the VFO that was not selected in Step 1.
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