RGO ONE Transceiver

Technical supplement (BOARDS layout & schematics):

rgo one transceiver New Firmware available & download Technical supplement schematics, boards layout, parts list and short description of each board.

RGO ONE tech supplement

RGO ONE tech supplement ver2.10A 28.08.2020


RGO ONE FIRMWARE UPDATES | software update files and notes:

New Firmware 2.20A available

This version includes some improvements in MB and FP microprocessors clock rate, speed and correct timing.
Setting proper clock rate for MB processor. (Clock frequency away from HAM bands).

Main board microprocessor clock can be heard near 20m band (actually image signal) like “crackling wideband noise”. With this version MB clock rate is adjusted little lower so not to disturb 20m reception.

Added MENU 81 – FCAL2 correction coefficient (coarse calibration) for SI570 VCO chip. If your RGO ONE is calibrated without FCAL2 then parameter value of MENU 81 would be zero.

Low pass filters (LPF) in PA module now are switched only on TX and disabled on RX. This is part of a LARGE SIGNAL HANDLING MOD.

Along with added pull down resistor in LPF board, this mod significantly improves RX dynamic range and LW/MW BCI immunity.

FW 2.20A highlights:

  • Improved communication between transceiver and PC at low CAT speeds.
  • Resolved CW sidetone issue (sidetone punctuation) when CAT system is activated.
  • “Crackling”noise issue resolved by slightly reducing of MB microprocessor clock frequency (set at 31.800 MHz)
  • Meter display now predicts/ shows measure mode – SWR, RF, ALC. Default mode is RF on TX.
  • LCD icons for otional modules do not show up if corresponding optional board is not installed.
  • Internal keyer CW speed/ratio corrected
  • UP/DWN/FST buttons on mic now are active.
  • Service menu entry added – menu 81 FCAL2 – SI570 calibration correction coefficient.
  • LPF and dedicated filter on TX is switched only on TX and disabled on RX. This helps to improve large signal handling at receiver front end. (This is part of LARGE SIG HANDLING mod).

Download FW 2.20A files

Version 2.00A – Older version Ver.2.00a

Version 2.10b from 9.9.2020 Ver.2.10b

RGO ONE transceiver is classic superheterodyne down conversion HAM transceiver covering all HF bands 1.8 – 29.7MHz (160/60m as an option).

Due to its modular construction it can be easily modified or redesigned in manner that suits operator. This kit is intended for users that like building their own home made equipment and constructions.

RGO ONE transceiver

Here are some of the feature highlights:

QRP/QRO output 5 – 50W

All mode shortwave operation – coverage of all HAM HF bands (160m/60m optional) High dynamic range receiver design including high IP3 monolithic linear amplifiers in the front end and diode ring RX mixer or H-mode first mixer (option).

Low phase noise first LO – Si570 XO/VCXO chip.

Full/semi (delay) QSK on CW; PTT/VOX operation on SSB. Strict RX/TX sequencing scheme. No click sounds at all!

Down conversion superhet topology with popular 9MHz IF

Custom made crystal filters for SSB and CW and variable crystal 4 pole filter -Johnson type 200…2000Hz

Fast acting AGC (fast and slow) with 134kHz dedicated IF

Stylish and professional look

Compact and lightweight body

Custom made multicolor backlit FSTN LCD

Custom molded front panel with ergonomic controls.

Silent operation with no clicking relays inside – solid state GaAs PHEMT SPDT switches on RX (BPF and TX to RX switching) and ultrafast rectifying diodes (LPF) Modular construction – Main board serves as a “chassis” also fits all the external connectors, daughter boards, inter-connections and acts as a cable harness.

Optional modules – Noise Blanker (NB), Audio Filter (AF), ATU, XVRTER PC control via CAT protocol; USB UART – FTDI chipset

Double CPU circuitry control for front panel and main board – both field programmable via USB interface.

Memory morse code keyer (Curtis A, CMOS B); 4 Memory locations 128 bytes each Contest and DXpedition conveniences – XFC function in SPLIT, RIT/XIT function


Test conditions:Supply voltage 13.8V, temperature 20C, antenna output terminated with 50ohm dummy load

Size: Cabinet: H 80mm; W 200mm; D 194mm (H 3.2”; W 7.9”; D 7.6”) Overall: H 90mm; W 200mm; D268mm (H 3.5”; W 7.9”; D 10.6”) (including optional fan cradle)
Weight tuning 2.670kg (5.9lbs.) (including optional fan cradle and weighted knob)
Construction feet. Rigid steel bottom and top covers. Molded front panel. Aluminum back and heatsink. Collapsible tilt stand and rubber
Supply voltage 10.5 – 14.5VDC
Current drain Receive 0.65A with RX preamp ON Transmit 10.5A typical @ 50W output power Current alarm at 12A
Radio topology 9MHz Single conversion superheterodyne receiver/transmitter with IF
Frequency drift Less than 50Hz total from cold start at 20°C; Temperature compensation built in
Frequency steps 1Hz, 10Hz, 100Hz, 1kHz. Frequency direct entry via keypad
Main encoder tuning rate: 512/256 ppr. (256ppr. is not possible with sw ver.1.00b)
Speed of tuning 5.12kHz per revolution when 10Hz step is selected
RIT/XIT range ±5kHz with step of 10Hz
Bands, MHz* Basic kit: 3.5-4.0, 7.0-7.3, 10.1-10.15, 14.0-14.35, 18.068-18.168, 21.0-21.45, 24.89-24.99, 28.0-29.7 160m option: 1.8-2.0 60m option: 5.25 – 5.45
Working modes LSB, USB, CW, CWR
Antenna impedance: Unbalanced 50 ohm
Display LCD type – FSTN positive 149 segments
4 common lines

Polarizer type – transflective

USB UART interface
FTDI chipset. Speed 9600 – 56300bps
Receiver Sensitivity (MDS) -135dBm (preamplifier On; VBF filter 2)
-129dBm (preamplifier Off; VBF filter 2)
Selectivity Crystal 8 pole 2.7kHz first roofing filter at 9MHz 0.2-2.7kHz second variable filter Johnson type 9MHz Crystal 2-pole IF noise filter 9MHz
Dynamic range Two tones close spaced (2kHz):

96db (Preamplifier On; VBF filter 2) 99db (Preamplifier Off;VBF filter 2)

  • 2W at 8 ohms internal speaker
  • Rear panel 3.5mm (1/8”) jack for external speaker
  • Front panel jack 3.5mm (1/8”) for headphones 8 – 32 ohms
IF frequency 9MHz (Other frequencies can be used. Firmware calculate LO&BFO frequencies)
Crystal filters Three type of filters are used – First roofing filter – 8 pole 9MHz; second (optional) 4 pole variable bandwith filter Johnson type 9MHz; third 2 pole noise filter 9MHz
Noise Blanker NB is optional plug-in accessory. IF type. 50db blanking range
Audio Filter AF is optional plug-in accessory. Follows selected bandwith
Transmitter Power output
  • 50W on CW; 40W PEP on SSB.
  • Adjustable output 5 – 50W by steps of 1W
T/R switching Clickless quiet diode switching. PTT/VOX on SSB QSK/Delay (10ms – 1.2s) on CW
CW sidetone Internally generated – Pure sinusoidal signal formed same manner as the CW signal. Adjustable frequency (400-800Hz) and volume independent from AF volume
SSB method Balanced modulator with suppressed carrier, 2.7kHz ladder type 8 pole crystal filter (Same filter used on RX). Tracking ALC scheme holds the PEP power in assigned limits
Microphone Standard electret microphone with bias
Carrier suppression
45dB minimum
Sideband suppression
50db minimum
Spurious products less than -47dBc
Harmonic content less than -45dBc
Intermodulation distortion IMD3 products on SSB @ 40W
-29dBc on 28MHz -31dBc on 14MHz
Duty cycle 50W – 50%; 20W – 100% (with optional fan cradle)
Load mismatch
  • VSWR<2 safe operation
  • VSWR>2 fold back procedure is initiated
  • VSWR>3 Forward power is turned down to 20W or less
  • and current to 6A maximum
Optional Fans Mounted on metal bracket screwed to back heatsink. Variable speed control for quiet and optimal operation. Fans run above 330C and switch off at 310C
METER Keyer Various parameters during TX can be showed and measured: Current, Forward and Reflected power (SWR), LPF reverse voltage, ALC level.
Keying modes
  • Iambic – Curtis A and CMOS B modes Straight key
  • USB keying via DTR and RTS lines (on/off in menu )
Speed range 5 – 45 WPM
CW memory 4 locations 128 bytes each; CW beacon function

*Performance of RGO ONE transceiver degrades significantly outside HAM bands although reception and tuning is continuous.

Front panel controls

RGO ONE transceiver is operated by 15 buttons, three mechanical encoders, main dial optical encoder, one dual concentric potentiometer AF/RF (10kohm/logarithmic + 10kohm/linear). The equipment has large custom multicolor backlit FSTN liquid crystal display (LCD)and two red LEDs, so various parameters like frequency, modes, signal strength and others can be displayed.

RGO ONE transceiver

1.    On/Off/meter/tune buttons

2.    LCD

3.    Numeric/function buttons

4.    TX/ALC LED indicator

5.    MIC connector

6.    Phones 3.5mm jack

7.    Power/Bandwith/Compression level encoder

8.    Key speed/Mic gain/Monitor level encoder

9.    Main dial frequency knob

10.    RIT/XIT/Function parameter encoder

11.    Dual concentric potentiometer for audio (AF) volume (inner knob)/RF gain control (outer knob)

The rear panel consist of power supply Anderson power pole connector, SO-239 antenna connector and other interface connectors. Rear panel is shown on fig.2

Rear panel view

RGO ONE transceiver

RGO ONE transceiver

1.    Antenna socket – SO239

2.    Power amplifier heat sink (Optional fan cradle is not shown)

3.    Optional XVRT unit output (might be covered if option not installed)

4.    Optional XVRT unit input (might be covered if option not installed)

5.    RX receive antenna connector (might be covered if option not installed)

6.    Ground post

7.    External speaker 3.5mm jack

8.    Electronic keyer paddle/straight key 3.5mm jack

9.    Linear amplifier control line (RCA connector)

10.    PTT in control line

11.    USB connector

12.    Accessory connector ACC1

13.    IF out connector for panoramic indicator

14.    Power supply 13.8V connector (Anderson power pole)


View Main Board (MB)

RGO ONE Main Board (MB) or so called mother board fits all connectors on the rear panel, power supply, I/O controller (second CPU). MB is also intended to be a chassis for all RF boards and options, as long as “cable harness” and board interconnections.
The board has the following components on it:
– I/O micro controller U5, DAC U7, external fan control – U8, T12, signal multiplexer U9, 3.3V LDO regulator chip U4

View LO board

LO board provides all oscillator signals needed for signal conversion and mixing. The board consists of the following components:

  • LO first oscillator realized by U2 – SI570 (570CAC000141DG), 3 switchable low pass filters: 10.8-15MHz; 15-24MHz; 24-39MHz. Filter switching is performed by I2C chip PCA9536
  • 9MHz generators – U3 (SI5351) BFO, CW sidetone, beeps, U1 (SA-612) balanced mixer which acts as CW/SSB monitor product detector, digital poteniometer – U7 (MCP4018-502E)
  • Tone shaping, (tones on/off ) circuitry – T1,T2,T5
  • Temperature compensation oven made by thermo resistor R14 and T3,T4


RX MIXER standard is ADE-1 diode ring mixer. Here described is optional high dynamic range H-mode mixer.

The schematic and original H-mode mixer concept has been designed by Colin Horrabin G3SBI and further developed by Martein Bakker PA3AKE.

Service menu

RGO ONE individual firmware parameters are kept in internal FLASH memory. These bytes of information are sensitive and the unit might not work properly if they are changed without needed knowledge and understanding.

Enter service menu:

Press and hold MTR MNU button while switching on the transceiver – enters in service menu. Long press of MTR MNU button stores parameters changed and leaves the menu. Short press of RIT/XIT CL discards changes made and leaves the menu.

It is recommended prior making any changes to the service functions parameters – to write down all values in bellow table:

No Service menu function parameter
70 F-cAL (frequency calibration)
71 IF (intermediate frequency)
72 bFocAL (BFO calibration)
73 S-FuL (S-meter full scale calibration)
74 S-9 (S-meter S9 calibration)
75 PA-t (PA temperature calibration) Must be aligned for proper t
76 Ic (current consumption) Must be aligned for proper Ic
77 Uc (supply voltage) Must be aligned for proper Uc
78 Po-25 (output power at 25W)
80 210U (Low pass filter high voltage) Must be aligned for proper Uc

Function selection is controlled by encoder 3 or UP REC and DOWN PLY buttons. Parameter selection is controlled by encoder 4

RGO ONE HF transceiver built and aligned
Now includes the following options:


  • – Heavy weighted knob
    – Bourns optical 128ppr ball bearings encoder
    – H-mode high dynamic range first RX mixer
    – Variable crystal 9MHz 4-pole filter
    – FAN cradle

Price: 790.00€

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