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Technical Documents by G8MNY

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List of Technical Bulletins produced and edited by John Stockley G8MNY

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Subject Title By Last Update
AERIALS

13cms 2 Lambda Slot G6KIU Dec 2004
13cms Dipole and Reflector VK3ABK Apr 2007
13cms Yagi from Pringles Can KN9MWR Mar 2006
23cm Skeleton Alford Slot G8MNY Dec 2003
23cms 65el loop Yagi details G8MNY Sept 2006
23cms 10ele Yagi for ATV G3ZJO Feb 2006
23cms 6el Yagi DG2GAJ Mar 2005
23cms Flat Plate Aerial G8MNY Jan 2003
23 element 1296 MHz antenna repair spec G0ATV Jan 1999
2m & 6m Band "Neptune" Aerial G8AMG
2m 3 ele Yagi G0FTD Mar 2006
2m 4el Quad you can build KI6DS
2m Fullwave Dipole G8MNY Mar 2007
2m JayBeam LR2 Colinear G8MNY Sep 2013
2m Slim Jim G0OEK
3 band VHF indoor aerial G0FTD May 2006
4m 5/8 Vertical G6OHM Nov 2004
4m J Pole G6OHM Nov 2004
6m 6el Yagis SP7QHP
6m 8el Yagi IK0ZIZ
6m Yagi from TV Antenna DG0OPK
70cm 19el Tonna Yagi info G0FTD
70cm 8el Yagi 2E1ESY
70cms & 2m Dual Band Aerial VK4XT
70cms 22el Yagi KE4IQQ
70cms 27 ele G3JVL's QLY G8MNY Jul 2010
70cms Bowtie Beam G6OHM
70cms Collinear 2E1ESY Nov 2005
70cms Bazooka Dipole PD2HFE May 2004
160m 7 Ferrite Rod Aerial G8MNY Oct 2010
A Nest of Dipoles for HF G8MNY Dec 2012 .
A Simple 3ele yagi for 144MHz G0FTD Mar 2008
Balloon & Kite Aerials G8MNY Aug 2008
Bent Dipole with GAIN! SP5RH
Coax Feeder Tests G8MNY Feb 2011
Delta Loops G4WYW
Growing Loft to Roof Aerials G8MNY Nov 2009
Simple /P HF Dipoles G8MNY Aug 2013
Simple Quarter Wave 2M /M Aerial Oct 2007
Tree antenna sky hooks G8MNY Jul 2009
Understanding Trapped Antennas G8MNY Feb 2006
Using a G5RV on 160 Metres G8MNY Aug 2013
Wall and Chimney Brackets G8MNY Dec 2008

AERIAL BITS
ATUs

A Homebrew UHF SWR Bridge G8MNY May 2009
HF ATU and SWR Bridge MFJ-904H G8MNY  Jan 2016
HF ATU and SWR Bridge VC300LP QT1  G8MNY Mar 2017
HF Balun and Marconi T switch G8MNY Jun 2015
VHF ATU Homebrew Design G8MNY Aug 2005

BALUNS

12 Uses if HF Trifilair Wound L G8MNY Apr 2015 
1:1 HF Balun G8MNY May 2009
1:6 HF balun(200,300,450,600 Ohm) PD2HFE Mar 2005
50-72 Ohm Balun for HF freq's G8MNY Mar 2005
50-200 Ohm HF Transformer G8MNY Nov 2009
Choke Balun for HF G8MNY May 2009
Coiled Coax Choke Balun for VHF G8MNY May 2009
HF Balun and Marconi T Switch G8MNY Jun 15
RF Directional Coupler G8MNY Nov 2016
Coax Sleeve Balun G8MNY Dec 2004
Pawsley Stub Coax Balun G8MNY Dec 2004
True VHF Impedance with MFJ259B G8MNY Dec 2016

FILTERS

23cms Filter G8MNY Dec 2003
2M Cavity Filter VK2DKW
6m Filter Design? G8MNY Apr 2004
60m Lowpass filter G3YRH Aug 2004
Coax Traps G8MNY Nov 2008
Drake TC-3300-LP QRO LP Filter G8MNY Oct 2009
HF RX Suckout Trap G8MNY Mar 2015
VHF/UHF TVI Filter G8MNY Feb 2010

ROTATORS

Rotator Alinco Diagram G8MNY Nov 2005
Rotator 12V /P G8MNY Jun 2007
Rotator Hishman Hit Ro 250 Info G8MNY Jan 2015
Rotator Kenpro KR400 info G8MNY Apr 2011
Rotator Radio Shack info G8MNY Jan 2015
Rotator Western WE115 info G8MNY Nov 2005
Rotator Yaesu G250 info G8MNY Jan 2006
Rotator Yamato YB101 info G8MNY Nov 2005

OTHERS

144/432MHz Homebrew Duplexers G8MNY Jun 2004
4 Aerial Doppler RDF G8MNY Jan 2015
4x Power Splitter for 2M or 70cm G8MNY Jan 2005
Coupler 2 TX into one aerial G8MNY
Doppler DF Aerial Design G8MNY Sep 2011
High Gain 70cm Preamp G8MNY Dec 2009
Making a Phasing Harness G8MNY Jan 2005
Stacking, Baying or Boxing Ant G8MNY Dec 2005

ATV/TV

23CM ATV Repeater GB3HV G8MNY Jun 2012
10 Pin VCR Camera Connections G8MNY
ATV Demo System at Kempton Park G8MNY Jun 2012
Black and Burst Sync Buffer G8MNY Feb 2005
Hearing the ATV Buzz G8MNY Jan 2009
IR Remote Control failures G8MNY Apr 2006
Low Power Video Buffer G8MNY Feb 2006
Radar Clipper for 23cms Feb 2006
Re Digital ATV  experience G8MNY Feb 2007
S-Video pin-out connections G8MNY Sep 2004
SCART Video Connections G8MNY Aug 2006
TV Systems and Displays G8MNY Jul 2009
Why analogue SAT RX bad for ATV G8MNY Feb 2005

BROADCAST

1W @ 531KHz MW Station system G8MNY Sep 2011
625 Line PAL Spec v Digital G8MNY Dec 2007
A Quality Crystal Set G8MNY Sep 2013
A TV masthead Preamp G8MNY Oct 2007
AM Broadcast Radio Principles G8MNY Ja
n 2010
AM TRF Radio G8MNY Nov 2008
Band 2  6Element Broadband  Yagi G8MNY Feb 2013
Band 2  6Element Narrowband Yagi G8MNY Feb 2013
BBC Testcard W G8MNY Apr 2013
Broadband 6el Yagi for Band 2 G8MNY Sep 2012
Coded Orthogonal Freq Div Mux G8MNY Nov 2008
Digital TV so far G8MNY Jan 2008
Digital TV /P G8MNY Feb 2007
Ever Growing TV Adverts G8MNY Jan 2009
FM Stereo Radio Principles G8MNY FEb 2016
HiFi Dynamic Noise Limiter G8MNY Mar 2013
IR Remote control failures G8MNY Sep 2012
Medium Wave Magnetic DF Loop G8MNY Apr 2015
MW Radio 1st stage G8MNY Dec 2003
MSF Time Signal Clock Feed Oct 2008
Odd Protection TV Fault G8MNY May 2007
Recording the whole LF and MF Band G8MNY Feb 2010
VCR Triplexer to TV G8MNY Mar 2006
VHF/UHF TVI Filter (As above) G8MNY Jan
2005
Technics RX ST RT550 G8MNY Jan 2009
TV Systems and displays G8MNY Jan 2009

CONNECTORS

 25 Pin D-Type Parallel Port G8MNY May 2004
Cables for Laplink, Fastlynx etc G8MNY
Diskette Drive Connector G8MNY
GAMEPORT/JOYSTIC Connections G8MNY
IBM Video Connections G8MNY
IBM XT/AT Keyboard connections G8MNY
ISA I/O card pin out M1BYT
Mouse Connections G8MNY Dec 2005
Serial Interface Connections G8MNY Mar 2005
USB Connections G8MNY Oct 07

CW

Passive CW headphone filter G8MNY Mar 2004
CW K Pip Tone unit G8MNY Jan 2010
FT290 CW KOX Circuit G8MNY Feb 2006
TS700G CW KOX add on unit G8MNY Sep 2009

MAINS CIRCUITS

70-260V Mains Auto Transformer G8MNY Dec 2012
APC Smart 900 UPS G8MNY Dec 2007
Constant Voltage Transformers G8MNY Oct 2007
Earths G8MNY Nov 2008
Economy Turn ON Timer G8MNY Feb 2007
Essential Mains Changeover G8MNY Sep 2013
Fairy Lights Flasher Feb 2010
Fluorescent Lamp Circuits  G8MNY Mar 2008
LED as a mains NEON G8MNY Dec 2005
Mains Plugtop Filter Adaptor G8MNY Sep 2014
Mains Power protector G8MNY Aug 2007
Power Line Telecomm QRM G8MNY Jan 2014
Saveplug Motor Economiser Jan 2013
Small Alafontronica 500W UPS G8MNY May 2016
SCR Drill Speed Controller G8MNY Feb 2005
Soldering Iron Economiser/Boost G8MNY Dec 2004
Thermostatic Soldering Iron LED G8MNY Mar 2011
TRAIC Light Dimmer G8MNY Aug 2010
UK 13A Fused mains plug G8MNY Mar 2008

MICROPHONES

A Simple V.O.X. Circuit G8MNY Sep 2009
Another Mic Preamp 2E1ESY
Autocaller with old Maplin Kit G8MNY Dec 2014
Hands Free Mobile Mic G8MNY Sep 2014
Mic DJ Preamp Dec 2012
Mic Preamps F5PBG Oct 2005
Phantom Bal Mic Preamp+Gun Mic G8MNY Oct 2004
Simple Mic Clipper for MC60A G8MNY May 2010
Toggle PTT PA3BNX Apr 2006
Yaesu DTMF Mic YM-48 G8MNY Nov 2008

MODIFICATIONS

3 way supplies for radio etc. G8MNY May 2005
BHI Noise Eliminating DSP LS Mar 2014
Comms Noise Squelch IC G8MNY Nov 2009
CTCSS add on Project G4WDZ Nov 2016
FT290/690/790 DC power mod. G8MNY Feb 2006
FT290/690/790 Mark1 PLL fault G8MNY Nov 2009
IC735 No RF Output Fault G8MNY Jan 2015
Laptop HDD Repair G8MNY Feb 2007
MSF Time Signal Clock Feed G8MNY Oct 2008
PA instability is ICOM IC735 G8MNY May 2013
PA and PSU Fan Noise G8MNY May 2015
PacCom Tiny2 Battery Tale G8MNY Jan 2008
PIC Frequency Counter Mods G8MNY Feb 2009
PSK31 Isolation Interface Nov 2009
PALSTAR AT1500 ATU G8MNY Jul 2013
Reducing Lamp Surge G8MNY Jan 2009
Simple Carrier Squelch G8MNY Dec 2006
Strange Scope Hum pdate G8MNY Mar 2008
TNC PC Clock Basic Program G8MNY Jul 2011
Variable Speed Fan for AF PA G8MNY Nov 2008
Variable Speed Thermal Fan G8MNY Jul 2015

POWER AMPLIFERS

2M 65W PA with 2X M6774H G8MNY Dec 2009
4CX250B PA regulated supplies G8MNY May 2013
4CX250B PA Timing and  Control G8MNY May 2013
ALC live for Drake L-4B PA G8MNY Mar 2012
DC/RF Sensing PA Switching G8MNY Dec 2003
Non relay instant RF Switching G8MNY Oct 2005
Power Factor of Drake L-4B PA G8MNY Oct 2010
PTT line for Drake L-4B PA G8MNY Jul 2007
T500M 12V 500W HF Linear G8MNY Feb 2017
Transistor PA Biasing G8MNY Aug 2007
Using 2 HF Ps's G8MNY Aug 2013
Valve Heater delay Drake L-4B PA G8MNY Aug 2016

PORTABLE and /Mobile

12V Cow Fence for /P G8MNY Dec 2003
12V Fluorescent Tube Inverters ZR6CPB & VK3EUB
12V Fluorescent Tube Fly Zapper G8MNY Jul2009
12V RF immune AF Booster Amp G8MNY Mar 2008
A light 17M /P Mast design  G8MNY  Sep 2013
A Proper Portable Setup G8MNY Aug 2008
Cheap Battery 12v LED light G8MNY Aug 2013
Delayed Interior Lamp G8MNY Jan 2010
Fluorescent 12V Dimmers G8MNY Aug 2006
GARMIN Nuvi 200 GPS G8MNY Jan 2009
Gin polling up large masts G8MNY Jan 2016
LED Bike Light Jan 2010
LED Lights DC0OS Jul 2012
Towing and Reversing Beeper G8MNY Sep 2008
Towing Socket for Caravans G4VVQ Jun 2012
Toggle PTT G8MNY Apr 2006
Vehicle Gutter /P Mast Support G8MNY Apr 2005
Wheel Nuts G8MNY Jun 2008
Windup 8m Mast for /P G8MNY Nov 2004
Windup Torch Info G8MNY Dec 2005

PORTABLE POWER

12V Switch mode adapters G8MNY Jan 2008
1A Float Charge Pb Acid Battery G8MNY Oct 2005
2nd Car Battery for /M & /P G8MNY Apr 2008
7AH "F" NiCad Battery Pack G8MNY Apr 2007
A battery Zapper by ON4CBL ON4CBL May 2011
Auto SCR charger for Car Batteries G8MNY Mar 2013
Car Alternators G8MNY Sep 2009
Cheaper Generators (EU Only) G8MNY Dec 2007
DC Power Conversion G8MNY Mar 2013
Diesel Generators G8MNY Aug 2013
DURITC 1kW 230V Inverter/UPS G8MNY Jan 2013
Honda Generator EX500 Info G8MNY Aug 2008
Inverter Petrol Generators G8MNY Jan 2014
Lead Acid Batteries G8MNY Feb 2010
NORTHEN 650W 2 Stroke Generator G8MNY Sep 2015
MEDUSA SIP2300 Generator Info G8MNY Jul 2013
MEDUSA SIP2300 Generator Repairs G8MNY Jul 2016
META HF Millennium 810H UPS G8MNY Nov 2012
Nisson Generator GL600 Info G8MNY Jun 2009
Power Devil Drill Charger G8MNY Oct 2007
Old Car Dynamos G8MNY Sep 2009
Performance Power 1kW Genny G8MNY Jun 2016
Petrol Generators for /P SSB Part 1 of 2 G8MNY Jul 2016
Petrol Generators for /P SSB Part 2 of 2 G8MNY Jul 2016
Power Devil Drill Charger G8MNY Oct 2007
Recovering OLD NICAD/NMHI Cells G8MNY Feb 2004
Regulating 12V Generator Output G8MNY Jun 2006
Simple SCR Regulated Charger G8MNY May 2013

PSU's

12V System Surge protection G8MNY Nov 2003
70-260V Mains auto Transformer G8MNY Jul 2011
A Common High Current PSU G8MNY Dec 2012
A Common UA723 PSU G8MNY Apr 2009
Adjusting 78xx/79xx Regulators G8MNY Feb 2005
Battery Backup PSU G8MNY Sep 2007
BNOS 12 Amp 13.8V PSU G8MNY Dec 2012
Chopper Regulators G8MNY Jul 2011
DC Power Conversions G8MNY Dec 2007
DELL 7000815 SMPSU 12V 75A Mods G8MNY Jun 2016
DRAE 24 Amp 13.5 PSU G8MNY Dec 2009
High AMP Crowbar Protected PSU G8MNY Sep 2008
Lab PSU ZR6CPB
Low Voltage Drop PSU G8MNY Jan 2013
PALSTAR PS06 6A PSU G8MNY May 2013
Reactance Controlled SM PSU G8MNY Dec 2010
Reforming Caps G8MNY Jul 2007
Regulating a Plug Top Power Supply G8MNY Oct 2008
Simple 20A PS G8MNY Sep 2011
Simple Variable PSU G8MNY Nov 2006
Splitting a floating PSU G8MNY Aug 2006
Stopping HF TX/RX SMPSU QRM G8MNY Jul 2006
Switch Mode Power Supply Principles G8MNY Dec 2006

TEACHING

80m VFO G8MNY Nov 2004
88mh Coils Explained G8MNY Dec 2007
AC Theory G8MNY Mar 2008
AC 3 Phase Power G8MNY Aug 2008
A Quality Crystal Set G8MNY Feb 2014
A ton per cell battery G8MNY Nov 2008
Actual Antenna SWR LZ1LEN
AF Standing Waves G8MAY Apr 2017
An AF amplifier stage G8MNY Dec 2004
ASCII table for diagrams G8MNY Aug 2011
Bad SMPSU design G8MNY Sep 2008
Calibrating Frequency G8MNY Nov 2007
Casting Lead Throwing Weights G8MNY Jul  2009
Christmas mains light chains G8MNY Dec 2006
Coax Faulting G8MNY Aug 2010
Coax Feeder Tests G8MNY Feb 2011
Coded Orthogonal Freq Dev Mux G8MNY Oct 2006

Corroded and Rusted Up G8MNY Oct 2009
CW SSB Rig Frequency G8MNYSep 2013
Darlington & Quasi Darlington G8MNY May 2006
DC Current Sources for Co-Ax AF G8MNY May 2009
dBW & dB Levels made easy G8MNY Jun 2016
Decoding BBS Data Files G8MNY Oct 2015
Driving Inductive Loads G8MNY Aug 2013
Dual phase AF AMP explained G8MNY May 2006
Faulting Tips G8MNY Apr 2017
Ferrite Ring Demo Circuit G8MNY Apr 2010
Flashing LED lamp driver G8MNY Jan 2014
FM Deviation Calibration G8MNY Jan 2016
Infra Red Camera Trick G8MNY Mar 2015
Kelvin Varley Voltage Divider G8MNYNov  2007
Laptop Fluorescent Tube Circuit G8MNY Nov 2006
Light Levels G8MNY Mar 2004
LM380/TDA2003 IC Audio Amps VE2ACT/G8MNY Mar 2006
Locking a Frequency with 555 G8MNY Jan 2016
Loud Speaker Protection G8MNy Dec 2008
Making ASCII Diagrams G8MNY Jan 2009
Measuring Motor Efficiency G8MNY Feb 2009
Microwave Ovens G8MNY Dec 2008
Mobile Mast Madness G8MNY Aug 2007
Modem Bauds and Bits G8MNY Dec 2012
Mono Stable Revisited G8MNY Jan 2016
Musical Scales G8MNY Apr 2010
My Home HF Set-up G8MNY Jul 2016
Night Light Switch G8MNY Jan 2016
Non relay instant RF Switching G8MNY Oct 2005
Odd Resistance Finder G8MNY Nov 2007
Old Valve Radios G8MNY Nov 2009
PL259 Losses G8MNY Apr 2011
Q Codes G8MNY Apr 2009
QRO V QRP G8MNY Mar 2014
Reducing Electronic RF QRM G8MNY Aug 2007
Reforming Caps G8MNY May 2015
RF Modules List G8MNY Apr 2006
RF Signal Calculations G8MNY Sep 2008
Rig DC power and RF Hazards G8MNY Feb 2012
Scope RF Trick G8MNY Apr 2011
Simple 80m VFO G8MNY May 2009
Sound Levels, dBA dBB & dBC G8MNY Jan 2006
Spectrum Harmonics Demo Circuit G8MNY May 2009
Spectrum IF Demo Circuit Feb 2010
SSB Demo Circuit G8MNY Dec 2004
Testing Auto ATU's G8MNY Mar 2016
TNC-PC Clock Basic Program G8MNY JUL 2011
Transistors, SCRs & TRIACs G8MNY Feb 2010
Transmission Line L & C VK2ZRG Oct 2004
Tuned Circuit Scope Demo Jan 2010
Understanding Multipath G8MNY Feb 2006
Understanding Transformers G8MNY Aug 2015
Unijunction Transistor Circuit G8MNY Nov 2005
Unit Madness G8MNY Aug 2012
Valves Tubes G8MNY Sep 2016
Variable RF Attenuator G8MNY Mar 2010
Variacs G8MNY Dec 2007
Voltage Dependent Resistor G8MNY Dec 2007
What is Multiplexing G8MNY Dec 2008
Why Extended ASCII Graphics G8MNY Jan 2014
Wind Up Torch Info G8MNY Dec 2005
Wire Conversion Table HB9ABX Dec 2005
Wiring and Form Tapping out Aug 2007
Xerox Principles G8MNY Dec 2004
Yet More IF Filters G3YRH Dec 2002

TESTGEAR

198kHz Off Air Standard G8MNY Nov 2016
AF 2 Tone Test Osc Design G8MNY Jan 2016
AF Noise Generator G8MNY Nov 2007
AF Waveform Generator G8MNY Oct 2008
A Homebrew HF SWR Bridge G8MNY May 2009
AKD's VHF/UHF Wavemeter WA1 G8MNY May 2005
Analyser Takeda Riken TR4122B G8MNY Jan 2017
A Simple Telephone Tester G8MNY Sep 2015
A Versatile Pulse Tester G8MNY Oct 2007
BURNS's MF-UHF Wavemeter TC-101 G8MNY Apr 2010
Car Dwell Angle and RPM Meter G8MNY Jan 2009
Clip on QRM probe G8MNY May 2013
Coax Tester G3YRH June 2006
Comparing Off Air Frequency Standards G8MNY Jan 2015
Crystal Drift Compensation G8MNY Jan 2008
Dip Oscillator G8MNY Nov 2007
Drake WH7 QRO SWR Bridge G8MNY Nov 2006
DYMAR Mod Meter Type 1785 G8MNY Mar 2008
Eagle DB120 Sound Meter G8MNY Dec 2007
Early AVO Valve Tester G8MNY Apt 2006
Edgcume Peebles Earth Loop Z G8MNY Jan 2008
Edgcume Peebles Megger and Low R G8MNY Jan 2008
High Voltage Probe G8MNY Feb 2017
HITACHI V-1050 Scope Info G8MNY Mar 2009
Kelvin Varley Voltage Divider G8MNY Nov 2007
Lab Breadboard G8MNY Nov 2007
Lab Measuring DMM Feb 2016
Lafayete 57 Range Multimeter G8MNY Jan 2016
LED test Screwdriver G8MNY Nov 2007
Logic Probe G8MNY Feb 2007
Mains Peak/RMS/Mean Meter G8MNY Dec 2004
Maplins Mains Meter 2000MU G8MNY Mar 2010
Maplins 13A Socket Mains Tester G8MNY Aug 2014
Marconi Counter Type 2432A G8MNY Oct 2016
Marconi Distortion Meter TF2337 G8MNY Dec 2008
Marconi 2019A Sig Gen G8MNY Nov 2016
Measuring 1 of 3 Resisters G8MNY Mar 2006
Meter Damping & Speed Up Circuits G8MNY Jan 2006
Meter Movement Types G8MNY Dec 2014
Off air lock for ref osc. G8MNY Jan 2015
Old Venner Counter Type TSA3334 Feb 2011
Oscilloscopes G8MNY Dec 2009 .
PEP Meter Modification G8MNY Aug 2007
PIC Freq Counter Mods G8MNY Feb 2009
Piston Absorption Wavemeter G8MNY Mar 2006
Portable Appliance Testing G8MNY Jun 2009
QRO Dummy Loads G8MNY Jul 2009
QRO 1KW HF Metered Dummy Load Dec 2012
QRP Power Meter & Dummy Load G8MNY Feb 2007
QRP SWR Bridge G8MNY May 2009
Reaction Timer G8MNY Jan 2006
RF Field Indicator FL-30AH G8MNY Mar 2009
RF Noise Bridge for LF M HF G8MNY Sep 2009
RTT Comms Test Set G8MNY Nov 2014
Scope & DMM Calibrator  G8MNY Sep 2013
RTT automatic Mod Meter G8MNY Jan 15
Scope Probes G8MNY Apr 2009
Simple Crystal Oven G8MNY Nov 2008
Simple PIV Test Circuit G8MNY Feb 2007
Spectrum Analyser Mods 1988/1989 G8MNY Mar 2015
Systron Donner 115 Pulse Gen G8MNY Jan 2016
Systron Donner 1702 Sig Gen G8MNY Jul 2013
VHF Test Oscillator G8MNY Jan 2016
Voltage Indicator Screwdriver G8MNY Aug 2007
Watson Hunter Counter Mods G8MNY Nov 2016

WiFi

Wifi Antennna M1BYT Feb 2009