A 50 W, single-board, direct-sampling SDR transceiver for 160–6 m by David Fainitski, N7DDC. It works with Thetis and other openHPSDR Protocol 2 programs over Gigabit Ethernet.
Radio
- 160–6 m, 50 W output, power amplifier on the same board
- Two 16-bit LTC2165 ADCs at 122.88 MHz; the second ADC has its own ADC2 input on the rear panel
- Low-noise preamp (MGA-53543) and two digital step attenuators (DAT-31)
- 14-bit AD9744 DAC for transmit
- 7 band-pass and 7 low-pass filters (160, 80, 60/40, 30/20, 17/15, 12/10, 6 m), switched automatically by frequency
- 122.88 MHz master clock locked to a 10 MHz reference; external 10 MHz input on EXT IO pin 5
Computer link and firmware
- openHPSDR Protocol 2, Angelia-compatible: 4 independent receivers, PureSignal and Diversity support in Thetis
- Gigabit Ethernet (KSZ9031); static IP or DHCP
- Bootloader 3.3: three firmware slots and self-update over the network, see below
Audio and connections
- TLV320AIC23B audio codec
- Front panel: Yaesu-compatible hand-mic socket, MIC, PHONE and KEY jacks
- Rear panel: SPK L/R speaker outputs with a built-in amplifier, and a 15-pin EXT IO connector, see EXT IO
Front-panel controller (PIC MCU)
- OLED display and power button
- Display screens: logo, firmware/IP/slot, power and SWR meter, temperature
- Fan control in 3 speeds, overheat and high-SWR protection
- Hand-mic button handling
| Front | Rear |
|---|---|
| OLED display | ANT: SO-239 antenna connector |
| H MIC: RJ-45 for a Yaesu-type hand microphone (SSM-75) | EXT IO: 15-pin connector, see below |
| KEY: paddle or straight key | ADC2: SMA input of the second ADC |
| PHONE: headphones | SPK L / R: speaker outputs |
| MIC: microphone | LAN: Gigabit Ethernet |
| PWR: power button | 12V: XT60 power input, 13.8 V |
DB-15HD (VGA-type) female connector on the rear panel.
| Pin | Signal | Pin | Signal | Pin | Signal |
|---|---|---|---|---|---|
| 1 | UO7 | 6 | ANT_1 | 11 | GND |
| 2 | TUNE | 7 | UO6 | 12 | UO5 |
| 3 | PTT_OUT | 8 | ANT_2 | 13 | ANT_3 |
| 4 | UO4 | 9 | PTT_IN | 14 | UO2 |
| 5 | 10MHz_in | 10 | UO1 | 15 | UO3 |
- UO1–UO7: user outputs. Set them per band in the Thetis open-collector (OC) settings, for example to switch an amplifier or antenna.
- ANT_1–ANT_3: antenna selection outputs, set by Thetis.
- PTT_OUT: open-collector output, active low (pulled to GND while transmitting), up to 12 V; use it to key an amplifier.
- PTT_IN: transmit input, for example a foot switch. Connect it to GND to transmit.
- TUNE: tune output.
- 10MHz_in: external 10 MHz reference input.
- Hold PWR for about 2 seconds to switch the radio on or off.
- The radio remembers its state. If it was on when 12 V was removed, it switches on by itself when 12 V comes back.
The OLED shows DESIGNED BY N7DDC / FW VERSION x.x during start-up. It then shows the firmware version, IP address and slot for 3 seconds.
| Button | Function |
|---|---|
| PTT | Transmit |
| MUTE | Mute or unmute the built-in speaker amplifier (SPK outputs only). The OLED shows MUTE or UNMUTE. The setting is saved. |
| P1 – P4 | Choose the display screen, see below |
| UP / DWN | Not used in normal operation; they select the slot in bootloader mode |
| P1: logo | P2: firmware, IP, boot slot |
|---|---|
 |
 |
| P3: output power and SWR | P4: temperature and fan speed |
 |
 |
The selected screen is saved and comes back after the next power-on.
Hold the button while switching the radio on (PWR, or 12 V when the radio was left on), then release it.
| Hold | Result |
|---|---|
| UP or DWN | Start in bootloader mode |
| P3 | IP reset: IP becomes 0.0.0.0, so the firmware gets its address by DHCP. Also starts in bootloader mode. |
| P4 | IP restore: the default static IP 192.168.2.160. Also starts in bootloader mode. |
| Button | Function |
|---|---|
| UP / DWN | Choose the slot the radio boots from, 1–3 (saved) |
| MUTE | Leave the bootloader and start the firmware in the chosen slot |
| PWR (hold) | Switch off |
If the button resistors of your microphone differ, the values are in the pinout picture: BTN1 = 7k, 27k7, 68k8, 150k, 470k (MUTE, P1–P4); BTN2 = 77k (UP), 127k (DWN).
| OLED message | What happens |
|---|---|
| OVERHEAT | The PA bias is switched off until the heatsink cools down. The fan runs at 3 speeds according to temperature. |
| HIGH SWR | At 15 W or more with SWR above 3.0, transmit is blocked until the SWR is back to normal. |
| FPGA ERROR | The FPGA did not answer: firmware missing or damaged in the selected slot. Hold PWR to switch off, then start in bootloader mode and choose another slot or write the firmware again. |
- The bootloader always works with a static IP; the default is 192.168.2.160.
- The working firmware uses the same static IP. If the IP is 0.0.0.0 (hold P3 at power-on), it uses DHCP.
- With a static IP, the PC network card must be in the same subnet, for example 192.168.2.10 / 255.255.255.0.
- The link runs at 1 Gbit/s. If the radio is not found, first check that the PC network card is in 1000 Mbit mode.
- In Thetis, select the radio model ANAN-100D (the board reports itself as Angelia).
The flash memory has 4 slots:
| Slot | Content |
|---|---|
| 0 | Bootloader itself |
| 1, 2, 3 | Working firmware. The radio boots the slot shown on the OLED. |
You can keep three different firmware versions and switch between them with UP/DWN. You do not need a programmer for this.
Files
- PC tool:
Odyssey_BL_3.3/PC_Tool/BootLoader_3.3.exe, orBootLoader_3.3.pywwith Python 2.7 / 3.x on Windows, Linux or macOS - Firmware:
Odyssey_3_2.0_ANP/Odyssey.rbf - Bootloader:
Odyssey_BL_3.3/Bootloader.rbf
-
Start the radio in bootloader mode. Hold UP on the microphone and switch the radio on. The OLED shows BOOTLOADER 3.3, the IP address and SLOT n.
-
Set the PC network to the same subnet as the IP on the OLED, for example 192.168.2.10 / 255.255.255.0.
-
Run BootLoader_3.3. Enter the IP shown on the OLED and press Connect. The tool shows Found: MAC …, bootloader 3.3.
- If you do not know the IP, press Discover. It finds the radio by broadcast, even in another subnet. Then either change the PC network, or set a new IP for the radio with Change IP → Write IP.
-
Choose the slot 1, 2 or 3. Press Browse and select
Odyssey.rbf. Keep Verify after writing checked. -
Press Write FW. The tool erases the slot (about 5 s), writes it and reads it back. The progress bar and log show each stage.
-
When asked Reset the device now?, answer Yes. The radio restarts and boots the slot shown on the OLED.
-
To boot a different slot, start in bootloader mode, choose the slot with UP/DWN, then press MUTE.
The slot you write in the PC tool and the slot the radio boots from are set separately. After writing a new slot, select it on the radio with UP/DWN.
- From the PC: Connect or Discover, type the new address in Change IP, then press Write IP. Adjust the PC network and connect again.
- From the microphone: hold P4 at power-on to restore 192.168.2.160, or P3 to switch to DHCP (0.0.0.0).
- In DHCP mode the bootloader has no address of its own. Find the radio with Discover and give it a static IP with Write IP, or hold P4 at power-on.
Select Slot 0 (bootloader) and a Bootloader*.rbf file, then press Write FW and confirm the warning.
⚠️ Do not interrupt power or the cable while slot 0 is being written. A damaged bootloader can only be restored with a JTAG programmer (USB-Blaster) andBootloader.pof.
The front-panel controller firmware, Odyssey_MCU.hex in the MCU_FW folders, is written with a PIC programmer such as a PICkit. Only do this when a new version is released.
| Folder | Content |
|---|---|
Odyssey_3_2.0_ANP |
Working firmware 2.0 (openHPSDR new protocol): Odyssey.rbf, Quartus sources, MCU firmware |
Odyssey_BL_3.3 |
Bootloader 3.3: .rbf / .pof / .sof, sources, PC tool, MCU firmware |
PCB |
Main board and connection board (Sprint Layout 6 .lay6, Gerbers) |
Metalwork |
Front and rear panels, top cover, heatsink, copper plate, fan (DXF / SVG) |
BPF_ODY3, LPF_ODY_3 |
Simulated responses of the band-pass and low-pass filters |
Misc |
Datasheets (KSZ9031, HR911130A, MGA-53543), SSM-75 pinout |
Images |
Photos and screenshots used in this page |
Legend: ANP = Angelia New Protocol, ported from the Angelia/Hermes openHPSDR firmware; BL = BootLoader.
73 de N7DDC