MARTIN - G8JNJ

Hi All,

I'm currently updating the site in order to make it easier to maintain.

So please excuse any formatting errors whilst I'm implementing changes.

I hope you can still find the information you are looking for.

Details of my Amateur radio activites can be found by clicking on this link

All current projects can be found by clicking on this link

G8JNJ Broadband HF Vertical Antenna - Requires no tuner

Broadband Vertical antennas & the Comet CHA-250B

M3KXZ no-counterpoise antenna - Does it actually work ?

Slinky antennas - Compact antennas made from Slinky toys may be proor performers

Portable Vee Dipole - Uses fishing poles and a lighting tripod

1m HF loop antenna - Uses a novel hinged plate tuning capacitor

Broadband Terminated Vee antenna - A travelling wave antenna using 9:1 Ununs & a 50 ohm terminating load

Rotary Washing line antenna - Various antennas using hardware from scrap rotary washing lines

Washing line wire reel antenna - A cheap portable antenna

Multiband Wire HF antennas - Thoughts on the G5RV and similar designs

Low Band Wire Antennas - Which is best

HF Antenna Switches - Remotely select a Doublet, Tee or Vertical for use with your 100w tranceiver

1.3GHz Colinear

2.4GHz Colinear

Better than a G5RV - the ZS6BK / G0GSV multiband HF antenna  - External site

More information relating to ZS6BK antenna and matching section - External site

The best source of HF antenna information - Cebik - External site

Problems with broadband transformers using Iron Powder Cores

6:1 Unun construction - Similar to Comet CHA 250 matching unit

Using Auto-Tuners - Some general information, Hints & Tips

General notes on Balun performance and construction  

Baluns that actually work - a few turns of coax don't - use a kg of ferrite - External site

Useful notes on the selection of ferrite materials - External site

Design for remote antenna switch for use with ZS6BK antenna - External site

SSB TX audio equaliser - Originally published in the February and March 2009 issues of Radcom

Build an audio Processor and clipper

Boom microphone for Yaesu FT-857 / FT-897 & Icom IC-7000 - modify a cheap PC headset

FT-897D - Audio processing and ALC operation

FT-897D S Meter calibration chart

Amateur TV - Analogue satellite receiver modifications

Ham Radio Deluxe

Faros - HF beacon monitoring

WSPR - personal beacon reporting system

HF Pack

HF Link ALE

WSPR NET

Nearby,com - Convert map co-ordinates

Local Live - Detailed aerial photos with 3D views

Radio Rag - A blast from the past - Manchester Student Pirate Radio

See eham for my reviews of:-

Autek Research VA1 Vector RX Analyst

Array Solutions AIM 4170 by W5BIG

CG-3000 Auto-Tuner

Elad SNA-2550 2.5 GHz Scalar Network Analyzer

Ham Radio Deluxe - Superb free control and logging software

ICOM IC-7000 Tranceiver

LDG Z-11 Pro - Auto tuner

mRS miniVNA 0.1-180Mhz

Spectran HF-6080 - Low cost spectrum analyser

Spiderbeam 18m telescopic pole

W4RT OBP Module with Heil HC-4 & HC-5 mic capsules

W4RT One Plug Filter – 2.3KHz Collins mechanical filter board

W6ELProp - propagation prediction software

Yaesu FT-897D HF and VHF /UHF Tranceiver

Yaesu MH31 microphone