Name: FlexRadio Systems FLEX-6400
Brand: FlexRadio Systems
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FLEX-6400/FLEX-6600 Hardware Reference Manual 
Page 3 of 45 
Copyright 2018 FlexRadio Systems.  All Rights Reserved. 
6.3  Pin 3: Line2 Out ................................................................................................ 23 
6.4  Pin 4: KEY In ..................................................................................................... 23 
6.5  Pin 5, Pin 6, Pin 7, Pin 8 and Pin 10: GROUND ............................................... 24 
6.6  Pin 9: +5VDC ..................................................................................................... 24 
6.7  Pin 11: Accessory TX ........................................................................................ 24 
6.8  Pin 12: SDA I/O ................................................................................................. 24 
6.9  Pin 13: Accessory TX REQ ................................................................................ 24 
6.10  Pin 14: PTT in ................................................................................................... 24 
6.11  Pin 15: SCL I/O.................................................................................................. 24 
7  PTT Input ................................................................................................................ 24 
8  TX Request Input (interlock) ................................................................................ 24 
9  External Amplifier ALC Input ............................................................................... 25 
10  Remote Power On Input ........................................................................................ 25 
11  GPS Antenna Input (w/GPSDO option) ................................................................ 25 
12  10MHz Reference Output (w/GPSDO option) ..................................................... 25 
13  Ethernet Connector ............................................................................................... 26 
14  USB 2.0 Ports .......................................................................................................... 26 
15  External Display ...................................................................................................... 26 
16  10 MHz Input .......................................................................................................... 26 
16.1  Radio Oscillator Startup ................................................................................... 26 
17  TX Relay Outputs [1,2,3] ....................................................................................... 26 
18  RX-B RF Input (FLEX-6600 only) ......................................................................... 27 
19  XVTR-B Transverter Port (FLEX-6600 only) ....................................................... 27 
20  Microphone Jack .................................................................................................... 27 
21  XVTR-A Transverter Port ...................................................................................... 28 
22  RX in/RX-A RF Input .............................................................................................. 28 
23  Headphone Jack ..................................................................................................... 28 
24  Chassis Ground ...................................................................................................... 28 
INSTALLATION ................................................................................................................... 30 
1  Safety ...................................................................................................................... 30 
2  Radio Placement .................................................................................................... 30 
3  Environmental Considerations ............................................................................. 30 
4  Connecting to a PC ................................................................................................. 30 
4.1  Ethernet Cabling Requirements ...................................................................... 30 
4.2  Direct PC Connection (Link-Local) ................................................................. 31 
4.3  Connecting via a Local Network ...................................................................... 31 
4.4  Installing SmartSDR ......................................................................................... 32 
Brand	FlexRadio Systems
Model	FLEX-6400
Category	Transceiver
Language	English
FlexRadio Systems FLEX-6400 User Manual

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