MARTIN - G8JNJ

ECLECTIC AETHER

Latest additions

Modified loss measurement details in 33ft Verticals and 4:1 Ununs section on Current Projects page

Other recent updates

 

Added comparison graph to CHA250 page

Updated Terminated Vee on Current Projects page

 

Created Current Projects page including 

  • M3KXZ 'no-counterpoise' antenna
  • Variable pitch normal mode helical
  • Broadband terminated Vee
  • Portable Vee Dipole
  • Broadband 1:1 choke baluns for tuners

Radio Related Ramblings

Hi,  Welcome to my website which I hope you will find useful and entertaining.

I'm an electronics engineer and licenced radio amateur

These pages mainly reflect my interests in Radio communication, but a few other subjects and interests are likely to sneak in, probably whilst I'm being distracted.

Background

Even when very young I was interested in all things electrical

                                     

As I got older this interest became more focused

                                                   

In 1974 I obtained my Amateur Radio Licence which I have now held for 30+ years
Some of the highlights include:-

Manchester

First operation was with a Pye Ranger on 2m AM - tuning High to Low for contacts
Pause of five years

2m NBFM using a Trio 2200G portable tranceiver
2m using modified Trio TS700  - mainly FM DX, SSB  and Satellite operation

Home built items included:-

      4CX250B Amplifier
      10 ele IP quad for 2m
      Copy of MM 2m to 70cm Transverter
      23 cm transvertor using nasty high level 23cm mixer (10w of 384MHz  injection)
      Much modified IC22A for 2m and 70cm mobile operation      
      In-car UHF talkthrough and control system using PF1 modules and CMOS logic
      Car to home UHF link, remote control of TS-700, RX AGC varying TX power
      UHF talkthrough systems in and around Manchester
      Other stuff for student events !


South Wales

RTTY and other Data modes using an Acorn Atom
Home built 23cm duplex link to hiltop, including filters and antennas
Remote controlled 2m and 70cm FM base stations and talkthrough systems
2m operation using antennas on top of 750' high tower
Occasional HF operation
Communication monitoring with AOR 2001 and other scanning receivers
Reception of Space Shuttle EVA comms - great letter back from commander & Crew
Wrote various magazine articles


Hampshire

Microwave operation
Satellite reception
Scanning - wrote a popular 'Short Wave Magazine' column for five years
ATV on 23cm,13cm and 3cm
HF operation using IC-7000 & FT-897 mainly on 160, 18, 12, 10 & 6m SSB, PSK, SSTV, ALE & WSPR
Various antenna experiments including Windoms, Broadband Verticals and Compact Loops

Investigations regarding Balun construction

 

Change log

Last Updated 1st July 2009

 

Modified loss measurement details in 33ft Verticals and 4:1 Ununs section on Current Projects page

Other recent updates

 

Added comparison graph to CHA250 page

 

Updated Terminated Vee on Current Projects page

 

Added Current Projects page including 

  • M3KXZ 'no-counterpoise' antenna
  • Variable pitch normal mode helical
  • Broadband terminated Vee
  • Portable Vee Dipole
  • Broadband 1:1 choke baluns for tuners

Added PDF scans of Radcom article SSB Speech Intelligibility including construction details

 

Updated Comet CHA-250 notes to include new graphs and information.

 

Further updated Baluns information to include placement of baluns and use with tuners 

 

Modified auto-tuners page

 

Updated reviews page

 

Added page relating to Radcom article on Speech Intelligibility

 

Addition to HF Antenna Switching

 

Rewrite of Multiband Wire HF antennas and Low Band Wire Antennas 

 

Updated Comet CHA-250 notes and associated pages.

 

Major rewrite of Ruthroff voltage baluns

 

        Visitor number