General Description
Features Overview
DV14307.03 Issue 04 March 2016 Transceiver Family 620X 19
Audio Outputs
The 620X transceiver includes four fully configurable outputs:
• Headphone 1 output, rated output power is 300 mW into 75 Ω.
• Headphone 2 output, rated output power is 200 mW into 75 Ω.
• Speaker output, rated output power is 4 W into 4 Ω.
• LINE-OUT output intended for ground station use only
Note: Headphone 2 and speaker output cannot be active at the same time
Mike Inputs
The VHF transceiver has an input for dynamic microphone (DYN_MIKE) and an input for standard
microphone (STD_MIKE).
The 620X transceiver provides four microphone inputs:
• Standard microphone input 1 (STD_MIKE1)
• Standard microphone input 2 (STD_MIKE2)
• Standard microphone input 3 (STD_MIKE3)
• Dynamic microphone input (DYN_MIKE)
Each input is able to operate with one single microphone or with two microphones of the same type
connected in parallel.
AF Auxiliary Input
The AF auxiliary provides the interface to connect an external audio source (e.g. NAV, music-player)
to the transceiver. Interconnection of multiple external audio sources on this particular port requires
additional external decupling/isolation resistors. The external audio is audible only when the
transceiver is in receiving mode.
The individual audio volume is set directly at the particular external equipment.
Side Tone
The side tone is available on the headphone output during transmission. The side tone volume
automatically adapts to the intercom volume setting.
Squelch Operation
When enabled the squelch (muting) circuit suppresses weak signals. There are two kinds of squelch
methods implemented, carrier- and noise-squelch. Carrier-squelch depends on the received signal
strength and is adjustable in configuration setup; the noise-squelch depends on the detected noise
level and is adjustable in the user menu.
Memory Channels
The memory function allows storage of up to 99+9 frequencies. A user defined text label is assignable
for each stored frequency. Additionally the last recently used 9 (active) frequencies are stored
automatically as "LAST" channels.
Intercom Operation
The built-in intercom circuit provides internal communication via between pilots and passengers via
connected headsets. The 620X system has two intercom circuits, "Front row" and "Back row". You can
connect a maximum of four headsets, e.g. pilot & co-pilot to first circuit and two passengers to second
circuit).
Scan Mode
Scan mode provides a dual watch function. The device is capable of monitoring frequencies on two
different channels, active & preset simultaneously. The signal of the active frequency will always be
audible, since it will have priority at all times.
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