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CQ WW 2017 with my all new QRP transceiver

CQ WW DX contest 2017 participation.
First QSO’s with my new transceiver Rgo One.

Here are the results:
Band     QSOs     Pts    ZN   Cty  Pt/Q
3.5       235       265     8      44     1.1
7         275       405    16     58    1.5
14       108       188     12     42     1.7
21        55        103      12     22    1.9
Total     673       961     48    166   1.4
Score: 205,654
1 Mult = 3.1 Q’s

Band conditions were pretty good (though I haven’t heard stations on 10m).

Here is P40L on 20m:

Here is 6Y0W on 20m:

IF/AF unit

This unit includes the following:

  • intermediate frequency IF amplification – MC1350
  • optional crystal filter (4 pole variable crystal Johnson type filter)
  • RX product detector – SA612
  • AF preamplifier – MC33079DG
  • RX MUTE and sidetone input circuitry
  • AF final amplifier – SA58631
  • Fast IF 134kHz Automatic Gain Control scheme – SA612,MC33079DG
  • Optional AF filter board

PCB component side



MIC amplifier, DSB, CW modulator unit – SSBGEN

In order to form DSB/CW modulation on TX, a SSBGEN board is used.

It consists of the following parts:

  • Microphone preamplifier and TX audio amplifier – TL082
  • Switched input: LINE IN or MIC (MUX 4053)
  • DSB modulator – SA612
  • CW drive level and form circuit – ½ of MCP4631 dual digi pot
  • SSB drive level (mic level) – ½ of MCP4631 dual digi pot

PCB component side




Six band pass filters were built to cover 10-80m bands on RX. Schematic utilizes Skywork solutions AS169 PHEMT GaAs SPDT switches, used in modern wirelless equipments. In order to perform individually “fine tune” a variable coil inductors are used. The module fully meets project CLICKLESS concept as there aren’t any mechanical switching components. MCP23008 serial controlled I/O expander is used to engage needed filter. The board has a provision for two optional filters.

PCB component side (bottom)

PCB top

The board

Filters spectrum analyzer plots:


Custom made control knobs

Three types control knobs are used in this project:

MAIN dial knob – for VFO frequency tune


ENCODER knobs – various functions


DUAL CONCENTRIC knobs – AF/RF gain control




To bring more professional and stylish appearance we decided to design custom front panel especially for this project.


Next question was: Injection plastic mold or machined aluminum

First, we made one prototype of machined aluminum in order to test if everything in design is right on the place


Then we start building (ordered) our face panel plastic injection mould. It is known that this was pain process and it took almost 3 months to build it .. after three revisions here it is now ready to “SHOOT” our plastic panels


We made some samples of all three materials available: Glass filled polyamide (black colored), Glass filled polypropylene (grey colored), ABS plastics (white colored)



Final 50W amplifier is designed using 4pcs. QFET N-MOS FAIRCHILD FQP13N10 transistor. The module consist of three stages: predriver with NXP PD85004, driver in push-pull configuration (2xPD85004) and final unit utilizing 4pcs. (2 by 2 push-pull in parallel) FQP13N10 transistors in easy to mount TO-220 case.

Main reason we chose such a general purpose switching MOSFET’s is that they are cheap and is in current production so can be delivered anytime from a trusty supplier.

Input matching and especially Ciss (~400pF) compensation is performed by input transformer TR2, inductors L3, L7, L8, L9, swamp resistors R7, R16, R26, R39. This group of components increases input drive signal for frequencies over 10MHz and swamps input energy for low frequencies where the overall gain is more than sufficient.

Bias voltage for all transistors is provided by voltage regulator 78L05 (U1) and MPSA13 (T11) which is in good contact with final transistor heatsink in order to perform needed temperature compensation.
In order to minimize voltage drop power supply input and current sensor are also on this board – C58,C59, D1, ZXCT1081E5

PCB component side:

PCB component side (references)


This board consist of the following modules:

5 sub PCB with low pass filters chebyshev type for all HF bands. There is place where to be nested one optional LPF subboard (for 160m)

High voltage (210V) scheme (voltage tripler)

Antenna RX/TX switching

SWR directional coupler and measurement of Vfwd/Vref

Optional LPF (160m) connector

This module ensures clear harmonic output of the linear amplifier, also fits the components for antenna RX/TX switching. Following the “click-less” concept, there are no mechanical relays in the circuit. After long searching for suitable power switching component I found VISHAY high voltage rectifier diode S07J (S07M) that met all the requirements for reverse voltage capacity, reverse recovery time, forward current and reverse voltage. So S07J were used in the project to ensure good switching of TX power to the antenna via proper LPF and also reliable isolation between each other low pass filters not selected for this band portion.

High voltage generated from input signal polarizes unused switching diodes in reverse direction ceasing the chance for signal leak. Same votage is used in RX/TX switch for completely disconnecting receiver front end on transmit.

PCB layout
Component side (bottom) values:

Component side (bottom) reference names

Top – connector side:

Picture of the ready board with filter subboards on it:



Block interconnection diagram

My homebrew HF transceiver RGO ONE consists of the following printed circuit boards:

  1. Front Panel assembly – plastic front panel, control knobs, FSTN display and keyboards, control board
  2. Mother board – fits all connectors on the rear panel, power supply, I/O controller (second CPU) intended to be a chassis for all RF boards and options, as long as “cable harness” and board interconnections.
  3. IF/AF Board – IF and audio circuitry, IF AGC 134kHz. Second narrow band crystal filter (option). AF filter (option)
  4. RF mixer board – RX/TX switching, receiver front end, first RX mixer, TX mixer, first roofing crystal filter, ALC circuit. Noise blanker (option). SSB monitor amplifier.
  5. Band pass filters – Front end filters 160-10m (160m option)
  6. SSB GEN board – forms both CW and SSB signals, microphone amplifier, compressor unit (option, Line in/Mic in circuit.
  7. LO board – local oscillators, side tone and beep tone oscillator. First oscillator and BFO oscillator. SSB monitor .
  8. Compressor unit (option)
  9. Automatic antenna tuner (option).
  10. Transverter/RX antenna board (option).
  11. Power amplifier assembly – consist of two boards PA55W and LPF nested directly onto the rear panel

    Block diagram and coax interconnections

Crystal filter 9MHz 2.7kHz

One of the most important modules in the home made HF transceiver project is the crystal filter. It is made of individual quartz crystals with matched parameters – Fser. (+/- 15Hz), Lm and Q factor > 100 000.  A large quantity of 9MHz oscillator crystals were purchased to extract only few to fit those requirements. Three type of quartz filters are used in this project – main (roofing) filter, narrow filter for SSB or CW modes and noise filter. All the filters are internally impedance matched to 50 ohm input/output circuitry and individually aligned.

img_3916  img_3917

Here is information about first – wide 2.7kHz SSB filter:

Filter type                          Chebyshev 8 pole

Center frequency             9MHz

Bandwith at -6db             2.7kHz

shape factor -6/-60db    1.75

IN/OUT impedance        50ohm

Band pass ripple              <1db

Stop band attenuation    >80db

VNA plot


Circuit diagram. Chebyshev 8 pole ladder type crystal filter


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