RGO ONE – Page 9 – Ham radio blog

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

IF/AF unit

This unit includes the following: intermediate frequency IF amplification – MC1350 optional crystal filter (4 pole variable crystal Jones type filter) RX product detector – SA612 AF preamplifier – MC33079DG RX MUTE and sidetone input circuitry AF final amplifier –

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

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

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

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

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

Block interconnection diagram

My homebrew HF transceiver RGO ONE consists of the following printed circuit boards: Front Panel assembly – plastic front panel, control knobs, FSTN display and keyboards, control board Mother board – fits all connectors on the rear panel, power supply,

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