RGO ONE on Dayton Hamvention 2018

RGO ONE homemade transceiver will be presented during this year HAM convention in Xenia, OH (18-20 may 2018). We welcome everybody to visit our booth #8014. Congrats for friends from AMECO who will give us a shelter.

Right after the HAM convention in Dayton pricing, configuration and availability of the radio will be known

Rgo ONE internal iambic memory keyer

Rgo ONE HF transceiver has built in CW iambic memory keyer.
1. Speed 5 – 45 WPM
2. Keying mode – Curtis A; CMOS B (Accu keyer;CMOS keyer but with 30% more tolerance)
3. 4 memory locations with 128 symbols each
4. Beacon mode
5. Normal/reverse paddle
6. Eligible dot/pause ratio (0,9 – 1,25)

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

 

 

BAND PASS FILTERS

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

capture

ENCODER knobs – various functions

rot-enc-knob

DUAL CONCENTRIC knobs – AF/RF gain control

dual-conc-knob-fit

 

FACE PANEL MOLD PLASTICS OR ALUMINUM MACHINED

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

argo-one-face-plate-silkscreenface-plate-new-measures-1

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

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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

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

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MOSFET LINEAR POWER AMPLIFIER 50 WATTS

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)

LOW PASS FILTER BLOCK 3.5-30MHz

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:

 

 

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