uprog research

2024. január 10., szerda

Two element delta-loop antenna for 20m band

Two element critical coupled delta-loop antenna for 20m band.

The distance between elements is 3m. One element is radiator the another is the reflector. The radiation direction can be changed using relay.

The F/B ratio is 26..30 dB. The SWR is 1.2- 1.4.

2023. augusztus 23., szerda

QRO - Linear Power Tube Amplifier - 800W PEP CW/SSB

2x GI7B tubes.

2023. március 24., péntek

2023. január 29., vasárnap

XtremeDX HF SDR

- development in progress

- 2x A/D - 0...50 MHz RF input

- 1x D/A - 0...50 MHz RF output

- USB2 on ARM

- USB3 on FPGA

- 7 series FPGA, BGA 484

- dual core 1 GHz ARM (DSP)

- 7'' TFT

- 12 Layer PCB, controlled impedance

2023-05-02 - "DONE"

2x USB2, USB3 connections and FPGA, CPU capacitors

One layer from 4 high speed layers.

Bottom side copper and silks

Top side copper and silks

2023-05-13

Synchronized PWR SUPPLY

for RFDSP board and TFT display

(not a real size)

2023-08-23

XDX and XDX PWR PCBs

XDX RFDSP assembled - 2023

XDX PWR supply - assembly in progress

2024-03-14

PWR supply done

Testing the FPGA and the input/output clocks of the A/Ds - LED blink

Testing the RF input relay

2018. január 15., hétfő

Cort A5 basszusgitar tuningolas

Folyamatban, Cort A5 Woodhead hangszedokkel [ PU ]

2018. január 4., csütörtök

FPGA / ARM DSP radio

The beginning 2017.m.d
RFDSP board dev. done 2018.01.04

[ High speed RF-DSP board ]

122 MSPS AD & DA,
Altera Cyclone IV FPGA,
STM32 ARM,
TI Audio CODEC,
5'' TFT

FW: I/Q based demodulation, signal processing in freq. domain.

H7R HF SSB radio DSP board 1v0

02.12

2018.04.dd

2018.05.dd
Spread spectrum DCDC 12V IN, 3V3 5V 48V OUT

VHDL CIC [ DEC by 10 ] simulation

Spread Spectrum DCDC power source

2019.06.19

Első tesztek / First tests ~ 14.2 MHz.SSB / USB

2019.06.23

2019.07.15

2019.09.30

2019.10.27 CyanBlue skin. 7MHz.

2020-2021. ------------------------------------------------------------------------------------------------------------

H7R HF SSB radio 1v1 DSP board assembly in progress

New / modified DCDC PWR supply

H7R HF SSB radio 1v1 DSP board & the new power supply assembled, FW modified

RF router,
RX/TX preamps, HP and RX/TX NYQ filters, A/D & D/A direct connect - work in progress

TX / RF spectrum measurements
TX DAC is working

2022.07.dd

MIC input / PTT input RF blocking & ESD protection

- i2c controlled audio compressor and RF blocking - PCB design done

PA driver & HF PA100 W

- 100W PA in progress

100W HF PA & PA driver test

The PA input power is aprox. 0.7W, the output power is 100..120W. Tested from 3.5 MHz to 30 MHz.

The PA output Power will be aprox. 160..180W with 1,4..1,5 W input Power (modified PA driver development in progress).

New PA driver and improved IMD

PA100W driver with RD15HVF. BIAS current thermal stability. BIAS On / Off on PTT. The output power is 26 dBm (the sum of spectrum power measured with dual tone), That's enough to drive the PA100W. The IMD performance is 60 dBc IM3.

100W PA with 2x MRF101 DMOS. Improved IMD performance, 30 dBc IM3, the IM5 and others are below. The output power is 100..130 W PEP with SSB. Improved BIAS current thermal stability.

- 3.65 MHz - 90W PEP @ 30 dBc IM3

- 7.15 MHz - 90W PEP @ 30 dBc IM3

- 14.2 MHz - 130W PEP @ 30 dBc IM3

- 21.2 MHz - 110W PEP @ 30 dBc IM3

- 24.9 MHz - 90W PEP @ 30 dBc IM3

- 29.9 MHz - 80W PEP @ 30 dBc IM3