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RGO ONE day one at hamvention 2018, Xenia OH
After the successful presentation start of RGO one we made some contacts on 40/20 meters. Here is a short video of a special event station for the hamvention – W8BI
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
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.
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
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.
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)
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 (references)