VK6FH WEBPAGE INDEX

Introduction - (About me page)	AWA company collapse 1987
The Shipping News 1984-95	Seagoing Radio Officer: Exam Syllabus
Telephone Ring Generator Mk I	Telephone Ring Generator Mk II
DTMF decode store and display Mk I	DTMF decode store and display Mk II
The Siemens Neophone	Linesman's Buttinski circuit
Economical Valve Audio Power Amplifier 6CM5/EL36	Economical Valve Audio Power Amplifier "Eu version" 25E5/PL36

Williamson Amplifier 1947	Ultra Linear Audio Amplifiers - observations
Minature Class D (PWM) audio amplifier's PAM8610 Class D Audio-amp prac design	FROM RUSSIA WITH LOVE Triode 25 watt Audio Amplifier
X-Y CRT Indicator	Digi-display for CRO
CRO trace doubler	Millersweep sawtooth oscillator
The Lambda (λ) Diode	The Schottky Diode (& transistor)
100/200/400 Hertz - Frequency Reference	Kalitron oscillators
(4046 PLL) 100/200/400 Hertz - Frequency Reference Mk2 (2021)	NE602 Direct Conversion Receiver (2021)

Transformer Design	Simple high curent DC voltage-regulator
Battery Charger	Voltage regulator for Car Alternator
13.8 Volt 20Amp DC Supply (SMPS)	Radio 'B' battery circuit (DC/DC converter)
Voltage Multiplier circuits	Volt, Amp, Ohm Meter (Analogue)
Attracted Armature Relays	3 Volt World
Ferrites - the 2 types	Joule-Thief (voltage boost) circuit Theory & Application

In-circuit Transistor Tester	Transistor curve tracer for CRO
FET (Power Mosfet) tutorial	CMOS buffered/unbuffered 'The TRUTH'
FET Dip Meter (HF)	FET Dip Meter & Impedance Bridge
FET connections	Single Mosfet FM wireless-mic
LC Meter (PIC16F84A based)	Frequency Counters - 3 designs
DDS Frequency Generator ~55MHz	DDS Freq' Generator & 500MHz counter

Coaxial cable: Impedance & Standing Waves	p - Couplers
Magnetic Loop Antenna (MF & HF)	Remote Tuned Magnetic Loop Aerial
HF Antenna Tuner (manual)	SGC Antenna Tuner (Auto)
Log-Periodic Antennae	50 MHz 4 element Yagi Aerial
RF conductivity SKIN EFFECT & Litz wire	RF conductivity SILVER PLATING
Pocket sized Metal Detector	Metal Detector with only 4 components

Magic Eye Demonstration	EPROM burner/programmer
Restoration of "old" Radio Transmitter	Pre-emphasis & De-emphasis - FM broadcast
FREMODYNE - VHF receiver	"Pulse-counting" type VHF FM radio tuner
HF valve receiver - regenerative	1 Valve Regen' receiver 12 DC Volt powered
A "CIGAR BOX" RADIO (B'cst Band)	MK484 based radio designs
H.F. SUPERHET receiver Mk I	H.F. SUPERHET receiver Mk II

H.F. SUPERHET/HOMODYNE rcvr Mk III	AM VHF Air-band Receiver (passive)
Icom R8500 DBM I.F. mixer mk1	Icom R8500 MOSFET I.F. mixer mk2{WIP}
RF Mixer (diode ring)	RF Mixer (cmos & mosfet)
SDR - Software defined Radio (Q.S.D. )	SDR uses USB dvb-t TV tuner 'dongle'
"Lidia" 7MHz Direct Conversion Receiver	Frequency Meter (PIC16F628A based)
Chinese V115 Radio 2019 upgrade & mods	JFET 'Cascode' design RF pre-amp' for V115 Radio
The care and feeding of LiPo batteries (2019)	Valve based 'Cascode' RF pre-amp'

SSTV - the Analogue Chronicles (c 1970's) Update 2020	SSTV Digital modes
Phantastron Oscillators explained (CRT timebase) (2020)	Wireless Hill Radio Stn (Perth) History (2020)
Radio-teletype RTTY decode & display	Encryption - An Ancient Art
Electret microphone - Compressor	Electret mic' needs no DC supply ?
LM386 IC Audio Amp - Modifying Performance	Audio Output Stage
WW 2 Radar letter band designations	ITU RF emissions designator: look-up table
Narrow Band Television NBTV (CRO interface) (2021)	NBTV to CRO interface Mk 2 (2021)
NBTV to CRO interface Mk 3 (Digital) (2021)	Construct NBTV to CRO I/face Mk 4 (2021) plus Test Oscillator

VHF Propagation	Fractal Type Antennae
DC to DC boost converters Solar enabled boost converter supply Boost converters further info'	Yagi-type antenna for "Digital" TV reception
162MHz for PROPAGATIONIST's	Yagi antenna for 162MHz AIS data reception
10 Metre/28MHz band radio beacons	Line Section Impedance Diagram
SWR meter (Reflectometer) Design #1 Design #2	Handbuilt Rcvr uses EDDYSTONE 898 dial
VHF Super-Regen Receiver using 6BL8 valve Mk 1 & 2	VHF Super-Regen Receiver using 6BL8 valve Mk3 uses EDDYSTONE 898 dial

Complimentary AWV QSL card 1960's	Amateur Station - G5BD 1930's
Australian MW Broadcast stations - history c 1923 - 1990 (Excel spreadsheet)	US ham call zones
The "S" meter	Potentiometers explained
Accu-Keyer IAMBIC morse keyer	Roger bleep circuit
From the Serviceman Who Tells - (Nr1) AM Car Radio for XY Ford Falcon	From the Serviceman Who Tells - (Nr2) Valve(Tube) based Audio Amplifier rebuild
From the Serviceman Who Tells - (Nr3) Astor Airchief CR model car radio - restoration (1951)	From the Serviceman Who Tells - (Nr4) Solid State Vibrator upgrade for old radios
From the Serviceman Who Tells - (Nr5) LCR-T4 Component Tester (2019)	EHT module 5 volt to 3,000 volt!! (2019)

Soviet Valve Manufacturer's	STC & Stromberg Carlson headphones
RC (radio-control) Servo Test Jig	INTERCOM circuit design: uses obsolete electro-mechanical telephones
Amateur Radio - MENTORING {VK3BB}	Working esteemed persons on the ham bands ! (73 magazine)
RF Mixer - What is a DIPLEXER ?	Class D and E amplifiers
CATHODE RAY "CLASSICS" Wireless World Technical Articles by M G Scroggie AKA "Cathoderay"	MULLARD valve application notes Wireless World Technical Articles by M G Scroggie AKA "Cathoderay"

▄▀▄▀▄▀ Frank's "FIXIE" 2011 ▄▀▄▀▄▀	▄▀▄▀▄▀ Frank's "FIXIE" 2012 ▄▀▄▀▄▀
Fixed-gear bike : chain tensioning	Wheel-building (Bicycle)
Car Alarm	Alarm Siren circuits
2 Terminal Flasher for Automobile	My Car
U.S. military 'Command' Receiver	Command Receiver - Frequency Convertor & Power Supply
AM re-broadcaster Design #1	AM re-broadcaster Design #2

AM re-broadcaster Design #3	Ferrite cored Coils and Inductance calculation
Electronic modules (ex China)	7 MHz SSB transceiver "Knobless Wonder Design"
MAR6 RF amp (VHF satellite S S T V rcvr') MMIC SGA-3486	International Space Station ISS Radiodata & Video monitoring (updated 2020)
Masthead Amp with discrete components	Satellite tracking goes WIRELESS
L C X F Calculator	ISS live-data decodes on an Iphone
Using the NE602 balanced mixer/oscillator	Australian MW/Broadcast Radio 'off-air' recordings from 1960/70's

CRT Greenscreen A-V monitor (W.I.P.)	Neon Novelties
Lissajous pattern generator	913 1" CRT test jig
Sinclair X10 audio amplifier PWM Class D	Sinclair X20 audio amplifier PWM Class D
(Sinclair) Thandar SC110 CRO	(Sinclair) IC-10 Audio Amp'
(Sinclair) Transistor pulse-count VHF-FM receiver (1966-2016)	American Mosaic
Radio Mi AMiGO (offshore-radio themed) broadcaster in Eu	H.F. Digital Broadcast
Radio Australia (Shepparton) Antennas Amateur Service activation (2020)	(Archive) Radio Amateur Cine films (2020)

7 MHz band CW Transmitter (c1948)	QRP Transmitter - low parts count (2020) 50B5 and 50C5 valves (Comparison)
Low Power Transmitter build (c1966) (2020)	FET Low Power Transmitter build (2020)
Dimitri Mendeléeff and his periodic table	1960's H. B. SELBY Catalogue
2 Chip Frequency Counter	Low Freq Xtal Oscillator 2/4/8 ....32,768Hz
Tuning Capacitors - some theory	JFET Regen' Receiver with Digital readout
Hi-Z Bootstrapping - an explanation	Delta Modulation

Single-Transistor Radio Beacon	LIPD Radio Beacon (36.625MHz)
Tone-Modulated Radio Beacon	Radio Beacon Receiver's (2 designs)
455 KHz B.F.O. (JFET)	LEADER Signal Generator LSG-11
Basic Laws of Trigonometry	Basic Laws of Electricity
Power & Voltage ratio in Decibels	E explained (2.71828 naperian logs)
1973 Quadzilla databook (2020)	Hellschreiber data transmission (2020)

When is a not a triumph ?	twin 270°/450° or 360°/360° firing interval which is best?
Desmodromic Valve Gear - explained	Flywheel Sludge Trap - clean
The Earles Fork (Motorcycle)	FORD V8 Engines - firing order
Camshaft theory Pt 1	Camshaft theory Pt 2
Chevrolet (1955-57 'shoebox' types) Spotters guide	Chevrolet Corvette 1953-1990 Spotters guide
Autolite Voltage Regulators (Beware!) (2021)

CAVEAT

This web site has been running
continuously (& growing) since Nov 24, 2009.
At that time website hosting
was economically attractive.
This sites webhosting will be renewed for
a further 2 years from Nov 2019.
However beyond Nov 2021 I feel, at this stage,
I will not be able to administer
and maintain the website.
This is due to increasing web hosting
and domain registration fees. (>$500)
Therefore, if any information within the site
is of any value to you,
you can save the information
on your computer before Nov 2021 termination.
(i.e. right click "save web page as ....")
Thanks Frank Hughes