Section 2: com, 1 communicating using the gns 530, 1 communicating using the gns 530 -1 – Garmin GNS 530 User Manual

Page 31

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GNS 530(A) Pilot’s Guide and Reference

190-00181-00 Rev. H

2-1

SECTION 2

COM

SECTION 2: COM

2.1 COMMUNICATING USING THE GNS 530

The GNS 530 features a digitally-tuned VHF COM radio

that provides a seamless transition from communication
to navigation, bringing the two most important functions
in flying together in one panel-mounted unit. The GNS
530’s COM radio operates in the aviation voice band, from
118.000 to 136.975 MHz, in 25 kHz steps (default). For
European operations, a COM radio configuration to allow
for 8.33 kHz steps is also provided (Section 10.4, Setup
Page: COM Configuration).

Volume

COM radio volume is adjusted using the COM Power/

Volume Knob. Turn the COM Power/Volume Knob
clockwise to increase volume, or counterclockwise to
decrease volume.

Squelch

The COM radio features an automatic squelch,

providing maximum sensitivity to weaker signals while
rejecting many localized noise sources. The pilot may
wish to override this automatic squelch function when
listening to a distant station or when setting the desired
volume level. The COM Power/Volume Knob allows the
pilot to disable the automatic squelch and keep the COM
audio open continuously.

Overriding the automatic squelch:

1) Press the COM Power/Volume Knob

momentarily.

2) Press the COM Power/Volume Knob again

to return to automatic squelch operation.

COM Window and Tuning

Communication frequencies are selected with the

tuning cursor in the standby COM frequency field (Figure
2-1), using the small and large left knobs to dial in the
desired frequency. The standby frequency always appears
below the active frequency. The active frequency is
the frequency currently in use for transmit and receive
operations.

Figure 2-1 ‘RX’ Receive Indication

‘RX’ Receive

Indication

Standby COM

Frequency Field

Active COM

Frequency Field

A frequency may also be quickly selected from the

database by simply highlighting the desired frequency on
any of the main pages and pressing the ENT Key. This
process is referred to as auto-tuning. Once a frequency is
selected in the standby field, it may be transferred to the
active frequency by pressing the COM Flip-flop Key.

While receiving a station, an ‘RX’ indication (Figure

2-1) appears in the upper right corner of the COM Window
to the immediate right of ‘COM’. A ‘TX’ indication appears
at this location when transmitting (Figure 2-2).

‘TX’ Transmit Indication

Figure 2-2 ‘TX’ Transmit Indication

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