Dynon Radios 310001-000 Aviation VHF Communications Transceiver User Manual
Dynon Radios LLC Aviation VHF Communications Transceiver
Users Manual
SV-COM-425 User Manual 1
Dynon Radios LLC
19825 141
st
Pl NE
Woodinville, WA 98072
Ph:(425) 402-0433
Fax: (425) 984-1751
SV-COM-425
U
ser
M
anual
The SV-COM-425 is a remotely controlled VHF communications transceiver. All
functions are controlled using a binary protocol over a serial RS-232 data link. The user
will require a SV-COM-450 panel mounted control head to control this transceiver.
Installation:
The SV-COM-425 transceiver is intended to be bolted or riveted onto the
structure of the user’s aircraft. The supplied harness connects the SV-COM-425 to the
SV-COM-450 control head. Power for both the units should be connected to the Red wire
in the harness, and the Black wire should go to the bus power’s return point.
Serial Protocol:
8 bit binary
1 stop bit
odd parity
38,400 Baud
Electrical Interface:
15 pin male DSUB-15 connector
Pin Description Pin Description
1 Microphone, audio input 9 Ground
2 Ground 10 Audio out
3 Enable, ground to activate power 11 Ground
4 Ground 12 Ground
5 Push To Talk, ground to transmit 13 Ground
6 RS-232 TX out of Unit 14 RS-232 RX in to Unit
7 Supply Voltage 15 Ground
8 Supply Voltage
SV-COM-425 User Manual 2
Power Requirements:
A positive supply of 10.0 up to 30.0 Volts.
Receiving: 200 mA
Transmitting: 3.0 Amps
Environmental: -20
o
C to +60
o
C (-4
o
F to 140
o
F) Ambient temperature
SV-COM-425 User Manual 3
Audio Requirements:
Microphone: 150 Ohms nominal input impedance
70 mV RMS for 70% modulation
Maximum input 2.0 V peak to peak
Headphone: 150 Ohms nominal output impedance
150 mW output power into 150 Ohms
Short circuit protected.
Transmitter:
Class 4
Output Power 6 Watts minimum at 10.0 VDC
Duty cycle 20%
Frequency range 118.000 to 136.975 MHz
Audio Frequency response 200 to 3.0 KHz
Frequency tolerance +/- 5 PPM from –20C t0 +60C
Modulation capability 85 % maximum
Audio distortion < 10%
Carrier noise level > 35 dB down
Side-tone level up to 150 mW into 150 Ohms
Stuck microphone timeout 31 to 34 seconds
Antenna Requirements: 50 Ohms impedance, BNC connector
VSWR less than 2.5 : 1
Receiver:
Class D
Frequency range 118.000 to 136.975 MHz
Audio Frequency response 150 to 3.0 KHz
Frequency tolerance +/- 5 PPM from –20C t0 +60C
Selectivity > 60 dB at +/- 25 KHz
Squelch Automatic, -1 µV setpoint
SV-COM-425 User Manual 4
Appendix 1 User Mode Serial Commands
Description of Data frames
Get Mode (1 byte)
Frame Name Description C code name Comments
Byte 1 Type 0x50 TYPE_GET_VHF_MODE
Mode (2 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0x51 TYPE_VHF_MODE
Byte 2 Mode bit flags
Rest of bits Reserved
Warning BIT4
status_flags
PTT2 BIT3 not used
PTT1 BIT2
RX Scnd BIT1
RX Prim BIT0
Set VHF Channels (5 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0x52 TYPE_SET_VHF_CHANNELS
Byte 2 Primary MSB UINT8 UINT16 prim_chan_idx
index number is split into 2
bytes: 0 < index <3036
Byte 3 Primary LSB UINT8
Byte 4
Secondary MSB
UINT8 UINT16 scnd_chan_idx
index number is split into 2
bytes: 0 < index <3036
Byte 5 Secondary LSB
UINT8
SV-COM-425 User Manual 5
Set VHF Mode and Volume (3 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0x53 TYPE_SET_MODE_VOLUME
Byte 2 Bit flags
Rest of bits
radio_mode
Reserved
Dual Watch BIT1
Unsquelch BIT0
Byte 3 Volume UINT8 radio_vol 0 < radio_vol < 255
Set Sidetone (2 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0x56 TYPE_SET_SIDETONE
Byte 2 Volume UINT8 sidetone_vol 0 < sidetone_vol < 255
Get VHF Channels (1 byte)
Frame Name Description C code name Comments
Byte 1 Type 0x57 TYPE_GET_VHF_CHANNELS
VHF Channels (5 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0x58 TYPE_VHF_CHANNELS
Byte 2 Primary MSB UINT8 UINT16 prim_chan_idx
index number is split into 2
bytes: 0 < index <3036
Byte 3 Primary LSB UINT8
Byte 4
Secondary MSB
UINT8 UINT16 scnd_chan_idx
index number is split into 2
bytes: 0 < index <3036
Byte 5 Secondary LSB
UINT8
SV-COM-425 User Manual 6
Get VHF Warnings (1 byte)
Frame Name Description C code name Comments
Byte 1 Type 0x59 TYPE_GET_VHF_WARNING
VHF Warning (2 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0x5A TYPE_VHF_WARNING
Byte 2 Warnings UINT8 warning refe
r to the warning index list
Get VHF Version (1 byte)
Frame Name Description C code name Comments
Byte 1 Type 0x5B TYPE_GET_VHF_VERSION
VHF Version (7 byte)
Frame Name Description C code name Comments
Byte 1 Type 0x5C TYPE_VHF_VERSION
Byte 2 H/W Major UINT8 HW_MAJOR
Byte 3 H/W Minor UINT8 HW_MINOR
Byte 4 F/W Major UINT8 FW_MAJOR
Byte 5 F/W Minor UINT8 FW_MINOR
Byte 6 S/W Major UINT8 SW_MAJOR
Byte 7 S/W Minor UINT8 SW_MINOR
Set Squelch (2 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0x5E TYPE_SET_SQUELCH
Byte 2 Squelch UINT8 squelch 0 < squelch < 255
SV-COM-425 User Manual 7
Get Serial Number (1 byte)
Frame Name Description C code name Comments
Byte 1 Type 0x63 TYPE_GET_SERIALNB
Serial Number (3 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0x64 TYPE_SERIALNB
Byte 2 Number MSB
UINT8 UINT16 Cal_SerialNumber
Byte 3 Number LSB UINT8
SV-COM-425 User Manual 8
Appendix 2 Confidential Test Serial Commands
Set Mic (2 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0x5F TYPE_SET_MIC
Byte 2 Mic UINT8 micLevel 0 < micLevel < 255
Get Pins Value (1 byte)
Frame Name Description C code name Comments
Byte 1 Type 0x60 TYPE_GET_PINSVAL
Pins value (10 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0x61 TYPE_PINSVAL
Byte 2 RSSI MSB UINT8 UINT16 RSSI
Byte 3 RSSI LSB UINT8
Byte 4 - UINT8 UINT16 reserved
Byte 5 - UINT8
Byte 6 VMOD MSB UINT8 UINT16 Vmod
Byte 7 VMOD LSB UINT8
Byte 8 TEMP MSB UINT8 UINT16 Temp
Byte 9 TEMP LSB UINT8
Byte 10 Mode bit flags
Rest of bits Reserved
Warning BIT4
status_flags
PTT2 BIT3 not used
PTT1 BIT2
RX Scnd BIT1
RX Prim BIT0
SV-COM-425 User Manual 9
Set TX Power (2 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0x62 TYPE_SET_TXPOWER
Byte 2 TX Power INT8 TX_Power 0 < TX_Power < 127
Write Calibration (17 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0x65 TYPE_WRITE_CAL
Byte 2 Number MSB UINT8 UINT16 Cal_SerialNumber
Byte 3 Number LSB UINT8
Byte 4 RSSI Base MSB UINT8 UINT16 Cal_RSSI_Base
Byte 5 RSSI Base LSB UINT8
Byte 6 RSSI Delta MSB UINT8 UINT16 Cal_RSSI_Delta
Byte 7 RSSI Delta LSB UINT8
Byte 8 TX Power INT8 Cal_TX_Power 0 < TX_Power < 127
Byte 9 NOT USED
Byte 10 TEMP MSB UINT8 UINT16 Cal_TX_Temp
Byte 11 TEMP LSB UINT8
Byte 12 VMOD MSB UINT8 UINT16 Cal_TX_Vmod
Byte 13 VMOD LSB UINT8
Byte 14 Sidetone UINT8 Cal_Sidetone 0 < Cal_Sidetone < 255
Byte 15 RX Volume UINT8 Cal_RxVolume 0 < Cal_RxVolume < 255
Byte 16 Squelch UINT8 Cal_Squelch 0 < Cal_Squelch < 255
Byte 17 Mic UINT8 Cal_Mic 0 < Cal_Mic < 255
SV-COM-425 User Manual 10
Read Calibration (1 byte)
Frame Name Description C code name Comments
Byte 1 Type 0x66 TYPE_READ_CAL
Calibration (17 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0x67 TYPE_CALIBRATION
Byte 2 Number MSB UINT8 UINT16 Cal_SerialNumber
Byte 3 Number LSB UINT8
Byte 4 RSSI Base MSB UINT8 UINT16 Cal_RSSI_Base
Byte 5 RSSI Base LSB UINT8
Byte 6 RSSI Delta MSB UINT8 UINT16 Cal_RSSI_Delta
Byte 7 RSSI Delta LSB UINT8
Byte 8 TX Power INT8 Cal_TX_Power 0 < TX_Power < 127
Byte 9 - - - NOT USED
Byte 10 TEMP MSB UINT8 UINT16 Cal_TX_Temp
Byte 11 TEMP LSB UINT8
Byte 12 VMOD MSB UINT8 UINT16 Cal_TX_Vmod
Byte 13 VMOD LSB UINT8
Byte 14 Sidetone UINT8 Cal_Sidetone 0 < Cal_Sidetone < 255
Byte 15 RX Volume UINT8 Cal_RxVolume 0 < Cal_RxVolume < 255
Byte 16 Squelch UINT8 Cal_Squelch 0 < Cal_Squelch < 255
Byte 17 Mic UINT8 Cal_Mic 0 < Cal_Mic < 255
SV-COM-425 User Manual 11
Set TX Gate Status (2 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0x68 TYPE_SET_TXGATE
Byte 2 ON/OFF Rest of bits Reserved
BIT0 status_txgate
Set TX Audio (2 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0x69 TYPE_SET_TXAUDIO
Byte 2 Volume UINT8 TX_Audio_vol 0 < TX_Audio_vol < 255
Set Security Unlock (6 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0xF0 TYPE_SECURITY_KEY set to:
Byte 2 Val1 UINT8 securityKey[0] 0x3B
Byte 3 Val2 UINT8 securityKey[1] 0xED
Byte 4 Val3 UINT8 securityKey[2] 0x58
Byte 5 Val4 UINT8 securityKey[3] 0xC2
Byte 6 Val5 UINT8 securityKey[4] 0x7F
Get Unlock Status (2 bytes)
Frame Name Description C code name Comments
Byte 1 Type 0x7F TYPE_UNLOCK
Byte 2 Unlock
Rest of bits Reserved
BIT0 0x00 or 0x01
if valid key, returns 1
if wrong key, returns 0