SV3ORA website

	26 Sep 2023
Website runs 24/7 on 5 watts of power!	Have you got any unwanted electronics? Components, projects, radios, equipment? Recycle by donating them to me for re-use. I undertake all shipping costs!

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Theory, information and tutorials

Natural radio

Electronics and RF techniques

Circuits and Projects

Poor man's laboratory equipment

Online software

Mechanical work

Useful Links

Contact me

HP8601A loop hybrid reproduction 

Detector probe 

The super probe miniaturized

Theory, information and tutorials
5-9 Report (archived Greek amateur radio magazine) Set up your own dial-up server (vintage networking through telcos) RF radiation and electroagnetic field safety Assembly tutorial and information Diodes evaluation for crystal sets - A simple test A tribute to the watch movement A tribute to the wind-up gramophone engine Linear UHF vacuum tube circuits Vacuum tube television General diode applications All diodes transceiver Passive crystal receivers Tunnel diodes Varactor diodes Schottkey diodes Rectifier diode audio amplifier Passive DSB transmitter Passive CW transmitter Ferrite core mixers Magnetic amplifiers Transformers Electromechanical transmitters and receivers Neon lamps Radar history The phasitron tube Thermoelectric generator Analog computers Logic gates technology 5000 IC audio amplifier circuits My designs on electromechanical transmitters for LW RCA power tubes comparison handbook The myth of reflected power Fundamentals of electronic counters	TV transmitters SSB transistorized CB Barlow Wadley loop Radio spectrum frequency allocation chart dBm, mw, Vpp, Vp, Veff conversion table Optimum wire size for RF coils Observations on ferrite rod antennas Designing wideband transformers for HF and VHF power amplifiers Crystal parameter measurement and ladder crystal filter design Quartz crystal parameter measurement Crystal filters with variable bandwidth and constant center frequency Easy to build crystal ladder filters (page26) Ultra low noise active devices on a budget 74LSxx series chips internal schematics Common varicaps in radio RF mixers explained. Part 1, part 2 and part 3. Understanding mixer products AM/SSB modulation and peak envelope detector Calculating transmitter efficiency Measuring transmitter power, do and don't Harmonics generation using step recovery diodes (HP) Understanding noise types in oscillators Motorola master selection guide - Small signal BJTs, FETs and diodes Voltage controlled capacitance without varactors IARU region 1 VHF and up band plan IARU region 1 HF Europe band plan IARU region 1 HF band plan Aeronautical HF radio map Greek spectrum allocation

Electronics and RF techniques	Natural radio
Idea for a simple wire recorder Notch to BPF conversion Hacking the GSM codecs to pass FSK data through Lead-free solder comparison. SAC305 vs SnCxPlus07 Wheatstone bridge splitter/combiner construction and measurements Using capacitors as varicaps Holder for RF toroids Transformers winding on HF in-phase splitter BJT negistor applications Salvaging electronics components for QRP projects Common mode chokes in boost converters Exponential RF amplifier for reducing harmonics without filtering Crystal oscillator oscillates in more than one frequencies simultaneously! An adaptable crystal set that has it all? Homebrew your own SiC LED Reliability of data storage media A generalized prototype board for digital electronics work The simplest way to program and read the PIC16F84 MCU Measuring and selecting the actual received frequency in regenerative and direct conversion receivers Ultra narrowband adjustable shape and bandwidth crystal phasing filter Making precision PCB coils Experiments on circuits on paper - Dwawn resistors Homemade film capacitors	The sounds of the earth and other natural sources and simple equipment E-field VLF natural radio receiver H-field VLF/ELF/ULF natural radio receiver (in development)

Circuits and Projects
RF electronics HP8601A loop hybrid reproduction Collins 51S-1 bandscope Converting the FRG-7 to true SSB (all mods) TAP, a morse alternative mode for the HAM Low voltage tube crystal oscillator Low voltage tube RF preamplifier Bucking transformer 240V to 225V An all-bands random wire antenna KISS703. A new mode for the HAM sv3ora's ultra minimalist transmitter A 15-components versatile keyer and powerful PSU modulator for the EMTX Rigs selector and automatic antenna switch for your shack All HF bands transmitter (experiment) Installing a mechanical SSB filter on the FRG-7 Tune your FRG-7 to true SSB Correcting the fine tune in the FRG-7 RF power switch for your rigs Classic 40 CW/AM transmitter Emergency transmitter - A 8-components high-power 40m/30m transmitter to get you quickly on the air The magical audio filter refined The brilliant "miniVFO". As stable as a crystal and mini! Dimming the panel lights on the Yaesu FT-301 Add general HF receive coverage to the Yaesu FT-301 HF DSB walkie talkie Simple all bands superhet CW receiver DDS DSB/AM receiver 0-60MHz QRP audio amplifier Mini AM transmitter The all waves RX powered by 1.5v DDS VFO 0-60MHz The "Super VFO". As stable as a crystal Simple MCU-free HF frequency counter Improving the Albrecht AE2990AFS Easy and reliable bfo A cheap and easy all hf bands transceiver A broadband concept receiver that will amaze you HF+6m active antenna for the Kenwood TH-F6/TH-F7 HF all bands handheld transceiver for the radio amateur An easy to build UHF TV modulator Single signal reflexed regenerative receiver All-bands single-signal filtered regenerative detector Universal, very low distortion, HF broadband crystal oscillator Vacuum tube microwave oscillator (Greek) All about LPD/PMR transceivers (Greek only) Wide range quadrature oscillator without DDS easy40 - A 14-components high-power transmitter to get you quickly on the air A 2-components oscillator High dynamic range broadband LNA for handheld transceivers Preamplifier switching and bypassing using RF as control HF directional coupler Broadband CW QRPp HF transmitter Ultra low noise, low distortion, general purpose LF/MF/HF oscillator All HF bands low distortion sinusoidal XO The ultimate QRP HF transceiver A simple, good quality UHF TV modulator The S53MV ZIF microwave transceivers reborn An easy to build all HF bands discrete SSB transceiver In-phase splitter/combiner 4:1 balanced to unbalanced balun 10GHz gunnplexer (in development) Magnetic receiver (in development) Fine tuning the SM0VPO HF amplifier for better performance An ultimate quality shortwave transceiver (in development) The fully transistorized radio project Smart KIT 1W FM transmitter reverse engineered Single span, high spectral purity oscillator 3KHz-30MHz (in development) A simple to assemble regenerative SW receiver My 10GHz SDR phasing SSB transceiver (in development) HF all-band tuneable bandpass filter 1-30MHz deluxe crystal controlled CW/CDW transmitter 1-30MHz ultra low noise and distortion crystal oscillator Control the transmitter from the computer Coaxial built transverter for the X-Band Alcatel BF4 (One Touch 511) information	Digital electronics CB2 microcomputer Bell 103 multi-interface modem micro SD locker and instructions for a safe PC (Greek only) The ATLAS computer A single chip micro-computer for the lab A universal variable VCO clock Reverse linear ramp, sawtooth generator Saturable inductor amplifier (an invention of mine) Diode amplifier (an invention of mine) Core rope memory Coincident current NOR gates Experiments on square loop toroids A transistorized 4-bit digital computer made out of discrete DTL (in development) A full-sized microcomputer inside a keyboard Development of a Tele-control Home Appliance Controller (my MSc project) First pages, Main report, Schematics and datasheets A simple, failure immune 4-bit digital computer made out of common TTL chips (in development) The ZX-80 computer (A useable home computer built REALLY from scratch. This includes PCB etching) The Jupiter Ace computer (A useable home computer built REALLY from scratch. This includes PCB etching. In development) Reverse engineering of the Vectrex system (The unique vector graphics system and how to build one yourself from scratch) The homemade PC-XT project (A greater scale PC-clone home computer. Some parts are in KIT form. In development)
Other electronics Electromechanical "magic eye" display Vibration activated LED charge pumps High power thrifty regulator A simple and cheap UPS UPS for ADSL routers and embedded systems Personal ballooning - A pioneer flying concept Experiments for Energy Harvesting and Efficiency A blinking LED Christmas tree The LED Zapper game (a game for the blind or the deaf) The SkyNet project (Low data rate laser data links, in development)	Audio electronics My High Fidelity audio page Audio compressor The vacuum tube poly-synth project (VCO section)

Poor man's laboratory equipment	Software I have developed (and other's useful software)
Detector probe The super probe miniaturized Quick and easy marker generator All waves RF generator Potentiometer noise tester 3-30MHz signal generator based on the brilliant "miniVFO". Simple MCU-free HF frequency counter High range LED meter display Quick components tester HF crystal tester Versatile oscillator/demodulator instrument (in Greek) Ultra wideband sinusoidal VFO with AM capability A handheld multi-purpose meter for the HF experimenter A low profile lamp designed specifically for SMD rework Poor man's HF spectrum analyzer A BASIC computer designed especially for lab use (in development) A low frequency circulator/isolator A mini reference oscillator A return loss bridge for impedance measurements A mini dummy load for impedance measurements Solid state UV PCB exposure Semiconductor analyzer (For BJTs, mosfets and diodes. An Elektor project) A homemade UV exposure box for big double-sided PCB fabrication	Schematix. Schematic drawing and exchanging for the radio amateur Morse code encoder/decoder Modified tap code encoder/decoder DataText. Transfer data through any radio amateur text mode The CDW communications mode (version 2) JLab - an online electronics software suite How to draw ARRL-style schematics The XDOS A complete software TNC for the radio amateur (other's project, documentation by me) NBTV programs for the radio amateur (other's projects)

	Mechanical work
	Repairing the tuning knob of the IC-728 transceiver Increasing the capacity of the Unimat SL (DB-200) Making a special knob for tuning the DDS in a handheld transceiver A depth gauge or Z-axis meter for the Unimat-SL (DB-200) Making a special screwdriver for the lab (under development) A table for the lathe How to mill an enclosure on a small lathe (part of another project) Experiments on the olive oil fuel

Useful Links
Dc4ku website. Measurements and RF (only in German) Great RF experiments website S53MV website. Microwave and advanced RF projects. JF1OZL website. Archived from www.intio.or.jp/jf10zl Greek Microwave Group website. Amateur group for microwave radio projects. YO3DAC - VA3IUL website. Amateur radio projects. LA8AK website. Amateur radio projects SM0VPO - G4VVJ website. Amateur radio projects. Hans Summers. Radio, Electronics and Computing Projects. QRP and SWL homebrew equipment. Cool homemade stuff homemade electronics components. Digital modes experimenter website. My professional website. Elm Chan website. Great microcontroller projects.	Freddy Alferink website. All about accurate measurements. Radio waves below 22KHz. Simple QRP equipment Homebrew electronics from Germany QRP4u Circuits from Russia Circuits from Czech Useful radio amateur scanned circuits Useful ham scanned circuits Electronics Circuits Reference Archive HF propagation prediction data Web SDR - Listen to DC-30MHz without an RX

	Places that I have visited
	A trip on a passive repeater Rhodes island Santorini island Samos island Lefkada island

Contact me (different options)
E-mail me The email to contact me is:	Video call me (Audio/Video) Read how!

Talk to me live on my transceiver (Audio only) Read how!	Enter the CB2 micro BBS It runs from a microcontroller! (Located at Patras city, started on late 2021) Two ways to connect Telnet: cb2.qrp.gr:2323 Dial-up: comming soon

* I purposely do not use Skype, Gtalk, Twitter, Facebook, or any other external services.
Disclaimer You are free to copy and use everything on this non-profit amateur website. Note that for copyrighted material, you may need to ask for the authors permission first. All material on this website is provided as is without any guarantee. Many of the material is my own thoughts and do not necessarily represent the truth. It is provided for you to read in order to understand the basic principles of operation. If you find your material is listed somewhere in this page and you want to remove it or get credit for it, please let me know and I will remove it immediately or add relevant notes. You may copy and use any content of this website to other pages, only if you clearly include in your pages the source that it has been taken from (which is this website). You may build and use any project only at your own risk and you are the only one that are responsible for its use. You should always consider your country regulations before building anything. * I am paying lots each year for maintaining this website and you get that for free, please gain knowledge from what you find here and be reasonable about copyright stuff anyway. Contact me FIRST before you make any nasty post anywhere on the web about my website! Website intentionally built using web 1.0 technology