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G4LTM England flag England

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Hi, my name is Graeme, I was born in 1945. My interest in Radio started way back in the 1950's when I was given a Crystal Set, this I had many an happy hour with, trying various lengths of wire for the antenna, not forgetting a good earth ( burying lead/copper pipes in the ground) later on the Crystal Set became more refined with the introduction of a 1 X Germanium Transistor and subsequently 2 & 3 Transistors were later added , power being now required, was provided by way of a small 4.5V battery.  Later on many ,many visits were made to the Ex WD stores for components of various kinds (I am sure many of us Radio Hams remember these with affection). I was first licenced on the 21st of April 1981. Then mid 80's I had a 32 year break from Amateur Radio (Work Commitments and Family), returned on VHF/UHF in 2014 and finally returning to my true passion which is H.F in April 2015 dosn't time fly when your having so much fun!!!

 

My Career

In the 1960's I joined the Royal Corps Of Signals and became a Radio Operator ,enjoyed myself immensely and learned an awful lot. I also swam (Breastroke) for the regiment and my best mate boxed for the regiment.

On leaving the Royal Signals, I joined the Technical Team at Aerialite Cables (later to be taken over by Delta Enfield Cables) Aerialite at the time, had a patent out on the five cell air spaced coaxial cable 75 ohms Impedance. Other types of coaxial cables were produced such as those that had a solid polythene dielectric or cellular dielectric  50 & 75 ohms Impedance . Other types were the balanced ribbon feeders 300 ~ 450 ohms Impedance.

Back in the 1970's I worked closely with the then Post Office Research Centre at Martlesham Heath chiefly on Coaxial Cable Measurement and Test Equipment

The above picture: In the early days of carrying out manual test and evaluation of coaxial cables

 

 

In 1985 I along with Hewlett Packard was responsible for the providing the company's  first turn-key solution for the Test and Evaluation of the many characteristics of the coaxial cable ( which when carried out manually was extremely time consuming and costly) here then are some photo's of the Automated Coaxial Cable Test System:-

The 4x8 way Coaxial Cable Multiplexer (totalling 32 coaxials that could be accomodated for automated test)

 

The 32 way coaxial multiplexer switch assembly with the Test Console and Computer

 

The main heart of the test system being the Hewlett Packard 8507c Spectrum Analyser & S - Parameter Test Set

The graph being shown is that of the Return Loss Ratio 40 ~ 860 MHz.

 

The Main Test Console with the Hewlett Packard Series 200 Computer and program running

 

I finally finished my service in 1996 with Delta Enfield Cables as Head Of Quality Assurance for the company.

 

Some suggestions when handling coaxial cables (hopefully these will assist in a good installation of your antenna system):-

1. Don't skimp when it comes to purchasing coaxial cable, choose a good quality and one that's appropriate to your operating conditions

2. Don't allow the coaxial cable to become kinked (could cause damage to the dielectric insulation).

3. Don't allow coaxial cable wall/fastening cleats to crush the cable again this could cause damage to the cables dielectric.

4. When using coaxial cable/wall fasteners try to space unevenly (this will prevent impedance irregularities being   unintentionally introduced).

5. Use good quality coaxial cable connectors of the correct impedance of your system.

6.. Remember to use a good Balun when going from a balanced feeder to an unbalanced feeder ( Ribbon Feeder= balanced Coaxial cable=unbalanced).

7. When soldering, use a good fluxed solder with a soldering iron that's hot enough to provide for good flow of solder ,ensure that the soldered joint is bright and not dull in finish, this will prevent a dry joint being perhaps created.

8. Lastly ensure there's no possibility of water ingress at the point of termination (the use of self-amalgamating tape or heat shrink tubing is highly recommended).

 

 Hobbies

Alongside amateur radio, my other interest are Photography both above water and below (having done quite a lot of marine photography throughout the world) Both my wife and I have been fortunate to have done quite a lot of cruising throughout the world including a world cruise. I also like gardening.

I am a member of the Royal Signals Amateur Radio Society.

My Station mainly consists of the YAESU FT-2000D, ICOM 5100E,Yaesu MD-200 Dynamic Desktop microphone,MFJ-993B Intellituner

My Antenna's are  a G5RV Half Size @ 24 Feet High( running West to East) An HyEndFed 5 Band for 80,40,20,15 & 10 Meters  running North West to South East and a Diamond V2000 for 2m/70cm and 6 Meters, QTH appro 590ft a.s.l, my garden space will not allow for anything larger, that and local planning authorities are not very amenable when it comes to granting permission. So we do the best we can, as I suspect do many Radio Amateurs.I have recently got interested with Dstar (April 2017) and I must mention G4HFG, from whom I have received quite alot of assistance in getting up and running with Dstar/ICOM 5100, Thank You Graham.

 

 

I am not interested in doing contest work or 59 in it etc on the radio, prefers to rag-chew instead!!

My main interest is with H.F on perhaps 80, 40 & 20 M. And now Dstar

73's

and good DX'ing, Take care when either on the roof or erecting your antenna/s

QSL Card via EQSL only

 

Graeme

8019682 Last modified: 2017-04-08 15:47:54, 6779 bytes

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