15 April 2021

RGO ONE large signal modification tutorial by Chris, G7DDN

Hi all,

there is short tutorial how to make Large signal modification on RGO ONE transceiver by Chris, G7DDN...

1. Remove top cover and disconnect speaker

2. Remove fan assembly - 2 screws on each side of heatsink

3. Remove two screws holding shield to rear panel - accessed through the heatsink

4. Remove 2 sunken screws in the side panels holding the shield in place to the chassis

5. Remove 2 screws through the PCB holding the shield to the PCB

After that follow the procedure which I posted over here:

OK1RP - Ham radio in Renaissance...: RGO ONE large signal modification is available

14 April 2021

RGO ONE large signal modification is available

Hi all,

Some users complained of interferences caused by strong local broadcast station on LW/MW. 

Boris, LZ2JR designed 7th order Chebyshev high-pass filter which was connected in line with the RX path. Filter effect though was inadequate and I was forced to look closer at receiver front end especially input point at RX/TX switch. Then realized that LPF diodes are not effectively cut off on RX so large signals can make them act like AM detector causing IMD problems. Adding pulldown resistor 100kohm would be enough for diodes to be reverse biased. (On RX cathodes see +13V). This way diodes and band LPF’s will be fully isolated from receive path and will no longer interact with incoming signals.

Needed parts:
1. SMD resistor 5% case 0805 value 100kohm
2. Firmware update to version 2.20A for front panel and main board processors

Added pulldown resistor is 100kohm SMD case 0805 and is easily placed onto the two vias in LPF board. LPF board is located on back panel PA assembly and can be accessed after removing PA shield and then completely pulling off the PA module.

100kohm pulldown resistor

This modification needs new firmware 2.20A to be uploaded in RGO ONE FP and MB processors. FW 2.20A completely disengage band LPF’s from receive path. Current band LPF is switched on only on TX.


10 April 2021

Latest fw revision 2.20A for RGO ONE is now available


latest firmware revision is available to upload on your RGO ONE transceiver. 


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:

  1. Improved communication between transceiver and PC at low CAT speeds.
  2. Resolved CW sidetone issue (sidetone punctuation) when CAT system is activated.
  3. “Crackling”noise issue resolved by slightly reducing of MB microprocessor clock frequency (set at 31.800 MHz)
  4. Meter display now predicts/ shows measure mode – SWR, RF, ALC. Default mode is RF on TX.
  5. LCD icons for otional modules do not show up if corresponding optional board is not installed.
  6. Internal keyer CW speed/ratio corrected
  7. UP/DWN/FST buttons on mic now are active.
  8. Service menu entry added – menu 81 FCAL2 – SI570 calibration correction coefficient.
  9. 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).

09 March 2020

FA-VA5 600MHz Vector Antenna Analyzer Kit

Hi all,

FA-VA5 is a high precision 600 MHz Antenna Analyzer for measurements of antennas, cables and other one port devices.

The VA5 is a portable, full-featured Vector Measuring Device with a frequency range of 10 kHz to 600 MHz, with the added benefit of a USB port for connection to a computer.

The designer, Michael Knitter DG5MK, has taken feedback from users of the previous VA4 instrument and incorporated many of the requested new features in the VA5, whilst maintaining high performance and excellent value for money.

·         Frequency Range 10 kHz - 600 MHz

·         Small dimensions 15 x 8.5 x 2.2 cm - fully portable

·         User friendly - intuitive menus

·         Large display with good readability

·         Low power consumption (up to 40 hours from 2 AA batteries)

·         SOL Calibration function

·         USB-interface with support of the DG8SAQ VNWA Software

·         Real time clock with backup capacitor

·         Audible buzzer alert for minimum SWR alignment

The FA-VA5's graphic display shows the complex impedance, standing wave ratio, complex reflection coefficient, capacitance and inductance.

Vector’s measurement means that, unlike a scalar instrument, not only the SWR is measured and displayed, but also the value of the impedance, including the signed imaginary part. The so-called SOL (Short, Open and Load) compensation is used for the calibration of the device and provides precise measurements in different configurations.

Have a look what you will get in the package and how assembly the analyzer…

The kit is double boxed with instruction manual

In two separated packages you will get PCB with pre-installed SMD parts and bag of thru hole parts including the LCD display which need to be soldered.

The instruction manual is detailed, precise and I am recommending to following all step by step.

Anyway I will highlight few important things which should help you during the assembling and it should avoid issues.

Motherboard PCB with ON/OFF switch and USB module installed

Before the installation of the USB module you have to ensure that insulating mica foil is correctly placed on the bottom of the board > in between the USB board PCB and motherboard PCB.

Correct place of the mica

Most important part of the assembling procedure is the LCD panel installation on the motherboard PCB. I am recommending to using three spacers instead of two pieces (recommended in the instruction manual) in order to avoid bending the headers and possibly LCD itself when you will press the fingers on the top during the soldering phase.

Three spacers used to avoid bending the headers during soldering

The rest of thru hole parts assembling should not make any troubles. Just be careful and do not overheating the switches and other plastic components while soldering them on the motherboard PCB. Specially the BNC socket used in the kit is cheapest component using the crappy plastic insulation inside so you must be quite careful during the soldering it on the PCB.

CAUTION: Do not overheating this component otherwise you can melt the insulation part inside and most important part of analyzer – the measuring port could failure due to inserting the DUT (movement causing short circuit or so)

You should also double check the polarity orientation of the both AA cells holders before soldering them to PCB.

All parts assembled on the motherboard PCB

Correct height of the LCD panel and well assembled input port BNC

The SMD components are pre-assembled on arrival

Housing the analyzer using pre-drilled box. All fits perfectly 

After the assembling the analyzer it should work for the first time. Do not use the charging AA cells as it will not work because of their low voltage.

Initial screen should be displayed after turning ON the analyzer.   

Building document done by P. Ourednik, 9-Mar-2020. Document 03-20, rev.1.0

73 - Petr, OK1RP

07 January 2020

The ATU add-on module for RGO ONE is coming soon

Hi all,

as you know the optional module of ATU is under finishing and the f/w code under tweaking for the RGO ONE.

One of the hardest point of the ATU performance - the very low impedance matching has been successfully tested on the beta test piece of RGO.

Look over here: https://youtu.be/aImge42dZZk

The antenna in use was an 80m band dipole. Tested band was 160m.
The ATU f/w code is still under tweaking and hardware is in beta testing to be sure that all will perform excellently in RGO ONE.

73 - Petr, OK1RP

The RGO ONE pre-order form online available now

Hi folks,

Due to the high volume of inquiries recently received Boris, LZ2JR decided to post this google form which reserves the right to the user who filled in this form to get advantage ordering RGO ONE transceiver on “first come – first serve” basis. Please FILL IN and SUBMIT the form as soon as possible.

The link is added to the Boris, LZ2JR page as same as to home page description of the RGO groups.io.

You can place the pre-order anytime online here:

Also directly on Boris, LZ2JR page here:

73 - Petr, OK1RP

06 December 2019

RGO ONE - new classic CW / SSB transceiver on the market - part 3 (first impression)

Hi all,

I got the chance to test this new radio coming on the market these days. Last evening I found the time to bring the RGO ONE to our contest station in order to make first short test on the air.

I have to say that I am impressed how the receiver is quiet. Compare to other radios and mainly SDR architecture radios the RGO ONE receiver has smooth and low noise. The VBF is very effective and nice feature for close in signals.

I had only short time yesterday evening so I tested it quickly on 40m then 80m band. As I found the pile-up for T6AA on 80m I had chance also to testing the RIT/XIT features etc. It is easy to manage and operate the RIT/XIT on RGO ONE.

Big surprise came after switching to 40m where that nite was hearable OTHR intruder at around 7005kHz. I tried to switch antenna to our contesting Icom IC-756PROIII quickly to found that OTHR occupied most of the CW portion in 40m band with over S9+20dB wideband mess. Even with 500Hz filter on Icom I was not able to hear any signals on 40m CW band as 30kHz far from the center I still had S8 wideband noise.

After switching to RGO ONE the surprise happened. Of course the OTHR blasted to S9+30dB at 7005kHz and covered wide portion of CW band but when I switched the VBF ON and reduced it down to 200Hz then I noticed that when I tuned up over the 7015kHz the wideband mess gone and I was able to operate and make QSO without any problem or QRM. Amazing!

I did not make video unfortunately as my phone battery lasted exactly at that time when I need it, hi... but I made QSO 15kHz away from the OTHR intruder with VBF set to 300Hz and I was not disturbed at all...

I had no more time to test it yesterday evening so more tests will come later.

And one more think... I like very much the sentences posted by KW6LA:
"I do like the old style controls. RGO ONE looks like a radio, not a garage door opener!"

73 - Petr, OK1RP