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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 04
13cms Dipole and Reflector VK3ABK Apr 07
13cms Yagi from Prigles Can KN9MWR Mar 06
23cm Skeleton Alford Slot G8MNY Dec 03
23cms 65el loop Yagi details G8MNY Sept 06
23cms 10ele Yagi for ATV G3ZJO Feb 06
23cms 6el Yagi DG2GAJ Mar 05
23cms Flat Plate Aerial G8MNY Jan 03
2m & 6m Band "Neptune" Aerial G8AMG
2m 3 ele Yagi G0FTD Mar 06
2m 4el Quad you can build KI6DS
2m Fullwave Dipole G8MNY Mar 07
2m Slim Jim G0OEK
3 band VHF indoor aerial G0FTD May 06
4m 5/8 Vertical G6OHM Nov 04
4m J Pole G6OHM Nov 04
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 Bowtie Beam G6OHM
70cms Collinear 2E1ESY Nov 05
70cms Bazooka Dipole PD2HFE May 04
1 Watt UK MW Station Aerial system Sep 05
160m 7 Ferrite Rod Aerial G8MNY May 08
A Nest of Dipoles for HF G8MNY Jun 05
A Simple 3ele yagi for 144MHz G0FTD Mar 08
Balloon & Kite Aerials G8MNY May 06
Bent Dipole with GAIN! SP5RH
Coax Feeder Tests G8MNY Jul 08
Delta Loops G4WYW
Simple /P HF Dipoles G8MNY Aug 05
Simple Quarter Wave 2M /M Aerial Oct 07
Tree antenna sky hooks G8MNY Jul 09
Understanding Trapped Antennas G8MNY Feb 06
Wall and Chimney Brackets G8MNY DEc 08

AERIAL BITS
ATUs

A Homebrew UHF SWR Bridge G8MNY Jan 09
HF ATU and SWR Bridge VC300LP G8MNY May 08
VHF ATU Homebrew Design G8MNY Aug 05

BALUNS

1:6 HF balun(200,300,450,600 Ohm) PD2HFE Mar 05
50-72 Ohm Balun for HF freq's G8MNY Mar 05
50-200 Ohm HF Balun G8MNY Mar 05
Choke Balun for HF G8MNY Dec 04
Coiled Coax Choke Balun for VHF G8MNY Dec 04
Pawsley Stub Coax Balun G8MNY Dec 04
Coax Sleeve Balun G8MNY Dec 04

FILTERS

23cms Filter G8MNY Dec 03
2M Cavity Filter VK2DKW
6m Filter Design? G8MNY Apr 04
60m Lowpass filter G3YRH Aug 04
Coax Traps G8MNY Nov 08
Drake TC-3300-LP QRO LP Filter G8MNY May 07
HF RX Suckout Trap G8MNY Sep 08
VHF/UHF TVI Filter G8MNY Jan 05

ROTATORS

Rotator Alinco Diagram G8MNY Nov 05
Rotator 12V /P G8MNY Jun 07
Rotator Kenpro KR400 info G8MNY Mar 08
Rotator Radio Shack info G8MNY Nov 05
Rotator Western WE115 info G8MNY Nov 05
Rotator Yaesu G250 info G8MNY Jan 06
Rotator Yamato YB101 info G8MNY Nov 05

OTHERS

144/432MHz Homebrew Duplexers G8MNY Jun 04
4x Power Splitter for 2M or 70cm G8MNY Jan 05
Coupler 2 TX into one aerial G8MNY
Doppler DF Aerial Design G8MNY Jun 08
Making a Phasing Harness G8MNY Jan 05
Stacking, Baying or Boxing Ant G8MNY Jan 05

ATV/TV

23CM ATV Repeater GB3HV G8MNY Oct 08
10 Pin VCR Camera Connections G8MNY
ATV Demo System at Kempton Park G8MNY May 07
BBC Testcard W G8MNY Jan 08
Black and Burst Sync Buffer G8MNY Feb 05
Hearing the ATV Buzz G8MNY Jan 09
IR Remote Control failures G8MNY Apr 06
Low Power Video Buffer G8MNY Feb 06
Radar Clipper for 23cms Feb 06
Re Digital ATV experience G8MNY Feb 07
S-Video pin-out connections G8MNY Sep 04
SCART Video Connections G8MNY Aug 06
TV Systems and Displays G8MNY Jul 09
Why analogue SAT RX bad for ATV G8MNY Feb 05

BROADCAST

1W @ 531KHz MW Station system G8MNY Oct 08
625 Line PAL Spec v Digital G8MNY Dec 07
A Quality Crystal Set G8MNY Nov 07
A TV masthead Preamp G8MNY Oct 07
AM Broadcast Radio Principles G8MNY Oct 08
AM TRF Radio G8MNY Nov 08
BBC Testcard W G8MNY Jan 08
Coded Othogonal Freq Div Mux G8MNY Nov 08
Digital TV so far G8MNY Jan 08
Digital TV /P G8MNY Feb 07
Ever Growing TV Adverts G8MNY Jan 09
FM Stereo Radio Principles G8MNY Mar 08
HiFi Dynamic Noise Limiter G8MNY Dec 05
IR Remote control failures G8MNY May 06
Medium Wave Magnetic DF Loop G8MNY Sep 06
MW Radio 1st stage G8MNY Dec 03
MSF Time Signal Clock Feed Oct 08
Odd Protection TV Fault G8MNY May 07
Recording the whole LF and MF Band G8MNY Mar 08
VCR Triplexer to TV G8MNY Mar 06
VHF/UHF TVI Filter (As above) G8MNY Jan 05
Technics RX ST RT550 G8MNY Jan 09
TV Systems and displays G8MNY Jan 09

CONNECTORS

25 Pin D-Type Parallel Port G8MNY May 04
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 05
Serial Interface Connections G8MNY Mar 05
USB Connections G8MNY Oct 07

CW

Passive CW headphone filter G8MNY Mar 04
CW K Pip Tone unit G8MNY Jan 09
FT290 CW KOX Circuit G8MNY Feb 06
TS700G CW KOX add on unit G8MNY Sep 09

MAINS CIRCUITS

APC Smart 900 UPS G8MNY Dec 07
Constant Voltage Transformers G8MNY Oct 07
Earths G8MNY Nov 08
Economy Turn ON Timer G8MNY Feb 07
Fluorescent Lamp Circuits G8MNY Mar 08
LED as a mains NEON G8MNY Dec 05
Mains Power protector G8MNY Aug 07
SCR Drill Speed Controller G8MNY Feb 05
Soldering Iron Economiser/Boost G8MNY Dec 04
TRAIC Light Dimmer G8MNY Feb 05
UK 13A Fused mains plug G8MNY Mar 08

MICROPHONES

A Simple V.O.X. Circuit G8MNY May 07
Another Mic Preamp 2E1ESY
Hands Free Mobile Mic G8MNY Jan 09
Mic DJ Preamp Jan 08
Mic Preamps F5PBG Oct 05
Phantom Bal Mic Preamp+Gun Mic G8MNY Oct 04
Toggle PTT PA3BNX Apr 06
Yaesu DTMF Mic YM-48 G8MNY Nov 08

MODIFICATIONS

3 way supplies for radio etc. G8MNY May 05
BHI Noise Eliminating DSP LS Sep 09
Comms Noise Squelch IC G8MNY Jun 05
CTCSS add on Project G4WDZ Oct 07
FT290/690/790 DC power mod. G8MNY Feb 06
Laptop HDD Repair G8MNY Feb 07
MSF Time Signal Clock Feed G8MNY Oct 08
PacCom Tiny2 Battery Tale G8MNY Jan 08
PIC Frequency Counter Mods G8MNY Feb 09
PSK31 Isolation Interface Feb 06
Reducing Lamp Surge G8MNY Jan 09
Simple Carrier Squelch G8MNY Dec 06
Strange Scope Hum pdate G8MNY Mar 08
Variable Speed Fan for AF PA G8MNY Nov 08

POWER AMPLIFERS

4CX250B PA regulated supplies G8MNY Dec 03
4CX250B PA Timing and Control G8MNY Oct 05
DC/RF Sensing PA Switching G8MNY Dec 03
Non relay instant RF Switching G8MNY Oct 05
Power Factor of Drake L-4B PA G8MNY Jul 08
PTT line for Drake L-4B PA G8MNY Jul 07
Transistor PA Biasing G8MNY Aug 07

PORTABLE and /Mobile

12V Cow Fence for /P G8MNY Dec 03
12V Fluorescent Tube Inverters ZR6CPB & VK3EUB
12V Fluorescent Tube Fly Zapper G8MNY Jul 09
12V RF immune AF Booster Amp G8MNY Mar 08
A light 17M /P Mast design G8MNY Aug 06
A Proper Portable Setup G8MNY Aug 08
Delayed Interior Lamp G8MNY Sep 08
Fluorescent 12V Dimmers G8MNY Aug 06
GARMIN Nuvi 200 GPS G8MNY Jan 09
Gyn polling up large masts Mar 09
LED Lights DC0OS Jun 08
Towing and Reversing Beeper G8MNY Sep 08
Towing Socket for Caravans G4VVQ Sep 08
Toggle PTT G8MNY Apr 06
Vehicle Gutter /P Mast Support G8MNY Apr 05
Wheel Nuts G8MNY Jun 08
Windup 8m Mast for /P G8MNY Nov 04
Windup Torch Info G8MNY Dec 05

PORTABLE POWER

12V Switch mode adapters G8MNY Jan 08
1A Float Charge Pb Acid Battery G8MNY Oct 05
2nd Car Battery for /M & /P G8MNY Apr 08
7AH "F" NiCad Battery Pack G8MNY Apr 07
A battery Zapper by ON4CBL ON4CBL Apr 04
Auto SCR charger for Car Batteries G8MNY Jan 05
Car Alternators G8MNY Sep 09
Cheaper Generators (EU Only) G8MNY Dec 07
DC Power Conversion G8MNY Sep 08
DURITC 1kW 230V Inverter/UPS G8MNY Mar 08
Honda Generator EX500 Info G8MNY Aug 08
Lead Acid Batteries G8MNY Jul 08
META HF Milennium 810H UPS G8MNY Mar 08
Nisson Generator GL600 Info G8MNY Aug 08
Power Devil Drill Charger G8MNY Oct 07
Old Car Dynamos G8MNY Sep 09
Petrol Generators for /P SSB G8MNY Jan 09
Power Devil Drill Charger G8MNY Oct 07
Recovering OLD NICAD/NMHI Cells G8MNY Feb 04
Regulating 12V Generator Output G8MNY Jun 06
SIP2300 Generator Info G8MNY Aug 08
Simple SCR Regulated Charger G8MNY Apr 06
SIP2300 WOLF 2700 Generators

PSU's

12V System Surge protection G8MNY Nov 03
A Common High Current PSU G8MNY Dec 06
A Common UA723 PSU G8MNY Apr 09
Adjusting 78xx/79xx Regulators G8MNY Feb 05
Battery Backup PSU G8MNY Sep 07
Chopper Regulators G8MNY Oct 05
DC Power Conversions G8MNY Dec 07
High AMP Crowbar Protected PSU G8MNY Sep 08
Lab PSU ZR6CPB
Low Voltage Drop PSU G8MNY Dec 06
PULSTAR PS06 6A PSU G8MNY Jan 07
Reactance Controlled SM PSU G8MNY Dec 07
Reforming Caps G8MNY Jul 07
Regulating a Plug Top Power Supply G8MNY Oct 08
Splitting a floating PSU G8MNY Aug 06
Stopping HF TX/RX SMPSU QRM G8MNY Jul 06
Switch Mode Power Supply Principles G8MNY Dec 06

TEACHING

80m VFO G8MNY Nov 04
88mh Coils Explained G8MNY Sep 06
AC Theory G8MNY Mar 08
AC 3 Phase Power G8MNY Aug 08
A Quality Crystal Set G8MNY Nov 07
Actual Antenna SWR LZ1LEN
An AF amplifier stage G8MNY Dec 04
Calibrating Frequency G8MNY Nov 07
Casting Lead Throwing Weights G8MNY Jul 09
Christmas mains light chains G8MNY Dec 06
Coded Orthogonal Freq Dev Mux G8MNY Oct 06
CW SSB Rig Frequency G8MNY Aug 09
Darlington & Quasi Darlington G8MNY May 06
DC Current Sources for Co-Ax AF G8MNY May 06
dBW & dB Levels made easy G8MNY Oct 04
Decoding BBS Data Files G8MNY Jan 09
Diesal Generators G8MNY Aug 09
Driving Inductive Loads G8MNY Jan 09
Dual phase AF AMP explained G8MNY May 06
Faulting Tips G8MNY Nov 07
FM Deviation Calibration G8MNY Nov 08
Kelvin Varley Voltage Divider G8MNYNov 07
Laptop Fluorescent Tube Circuit G8MNY Nov 06
Light Levels G8MNY Mar 04
LM380/TDA2003 IC Audio Amps VE2ACT/G8MNY Mar 06
Loud Speaker Protection G8MNy Dec 08
Making ASCII Diagrams G8MNY Jan 09
Measuring Motor Efficiency G8MNY Feb 09
Microwave Ovens G8MNY Dec 08
Mobile Mast Madness G8MNY Aug 07
Modem Bauds and Bits G8MNY Dec 08
Musical Scales G8MNY Feb 08
Non relay instant RF Switching G8MNY Oct 05
Odd Resistance Finder G8MNY Oct 07
Old Valve Radios G8MNY Aug 09
PL259 Losses G8MNY Oct 08
Q Codes G8MNY Apr 09
Reducing Electronic RF QRM G8MNY Aug 07
RF Modules List G8MNY Apr 06
RF Signal Calculations G8MNY Sep 08
Simple 80m VFO G8MNY May 09
Sound Levels, dBA dBB & dBC G8MNY Jan 06
Spectrum Harmonics Demo Circuit G8MNY May 09
SSB Demo Circuit G8MNY Dec 04
Switch Mode PS Principles G8MNY Apr 06
Transistors, SCRs & TRIACs G8MNY Oct 03
Transmission Line L & C VK2ZRG Oct 04
Understanding Multipath G8MNY Feb 06
Understanding Transformers G8MNY Oct 07
Unijunction Transistor Circuit G8MNY Nov 05
Unit Madness G8MNY Feb 06
Valves Tubes G8MNY Mar 08
Variable RF Attenuator G8MNY Mar 09
Variacs G8MNY Dec 07
Voltage Dependent Resistor G8MNY Dec 07
What is Multiplexing G8MNY Dec 08
Why More Extended ASCII Graphics G8MNY Oct 08
Wind Up Torch Info G8MNY Dec 05
Wire Conversion Table HB9ABX Dec 05
Wiring and Form Tapping out Aug 07
Xerox Principles G8MNY Dec 04
Yet More IF Filters G3YRH Dec 02

TESTGEAR

198kHz Off Air Standard G8MNY Nov 08
A 2 Tone AF Test Osc Design G8MNY Jun 04
AF Noise Generator G8MNY Nov 07
AF Waveform Generator G8MNY Mar 08
AKD's VHF/UHF Wavemeter WA1 G8MNY May 05
A Simple Telephone Tester G8MNY Aug 07
A Versatile Pulse Tester G8MNY Oct 07
BURNS's MF-UHF Wavemeter TC-101 G8MNY Mar 09
Car Dwell Angle and RPM Meter G8MNY Jan 09
Coax Tester G3YRH June 06
Comparing Off Air Frequency Standards G8MNY Feb 08
Crystal Drift Compensation G8MNY Jan 08
Dip Oscillator G8MNY Nov 07
Drake WH7 QRO SWR Bridge G8MNY Nov 06
DYMAR Mod Meter Type 1785 G8MNY Mar 08
Eagle DB120 Sound Meter G8MNY Dec 07
Early AVO Valve Tester G8MNY Apt 06
Edgcume Peebles Earth Loop Z G8MNY Jan 08
Edgcume Peebles Megger and Low R G8MNY Jan 08
High Voltage Probe G8MNY Apr 06
HITACHI V-1050 Scope Info G8MNY Mar 09
Kelvin Varley Voltage Divider G8MNY Nov 07
Lab Breadboard G8MNY Nov 07
Lab Measuring DMM Aug 07
Lafayete 57 Range Multimeter G8MNY Feb 08
LED test Screwdriver G8MNY Nov 07
Logic Probe G8MNY Feb 07
Mains Peak/RMS/Mean Meter G8MNY Dec 04
Maplins Mains Meter 2000MU G8MNY Feb 08
Marconi Distortion Meter TF2337 G8MNY Dec 08
Measuring 1 of 3 Resisters G8MNY Mar 06
Meter Damping & Speed Up Circuits G8MNY Jan 06
Meter Movement Types G8MNY Dec 08
Off air lock for ref osc. G8MNY Jun 04
Oscilloscopes G8MNY Feb 09
PEP Meter Modification G8MNY Aug 07
Piston Absorption Wavemeter G8MNY Mar 06
Portable Appliance Testing G8MNY Aug 05
QRO Dummy Loads G8MNY Apr 05
QRO 1KW HF Metered Dummy Load Aug 08
QRP Power Meter & Dummy Load G8MNY Feb 07
QRP SWR Bridge G8MNY Jan 06
Reaction Timer G8MNY Jan 06
RF Field Indicator FL-30AH G8MNY Mar 09
RF Noise Bridge for HF G8MNY Dec 04
Scope & DMM Calibrator G8MNY Apr 09
Scope Probes G8MNY Apr 09
Simple Crystal Oven G8MNY Nov 08
Simple PIV Test Circuit G8MNY Feb 07
Spectrum Analyser Mods 1988/1989 G8MNY Aug 07
VHF Test Oscillator G8MNY Nov 07
Voltage Indicator Screwdriver G8MNY Aug 07
Watson Hunter Counter Mods G8MNY Jan 08

WiFi

Wifi Antennna M1BYT Feb 09