Figure 1-1 Radio Reception Range

CHAPTER ONE

SNFO/SWSO VOICE COMMUNICATIONS

4. After your call, release the button and wait a few seconds before calling again. The

controller may be jotting down your call sign, looking for your flight plan, or listening on a

different frequency since the controller monitors both VHF and UHF frequencies.

5. Be alert to the sounds or lack of sounds in your receiver. If it sounds unusually quiet after

having been on a frequency for a while, check your volume and frequency setting. Check your

equipment to ensure that your microphone is not stuck in the transmit position. Frequency

blockage can occur for extended periods of time because of unintentional transmitter operation.

This situation is referred to as a "stuck mic." Also ensure that your microphone is properly

placed against your lips.

6. Be sure you are within the performance range of station equipment. UHF radios are

limited to "line-of-sight." Remember, as altitude increases, radio range increases.

Use the chart in Figure 1-1 to approximate radio range.

Figure 1-1 Radio Reception Range

Example

An aircraft at 5000 feet will have an approximate UHF range of 50 NM to a ground station.

1-2

TECHNIQUE AND TERMINOLOGY