2016-08-07

The plumber has left the building!

So the plumber has gone away with a smile on his face. Sten came and in-between other jobs, fixed my leaky pipe. The pipe had been leaking in the wall for some time...maybe years?

Well the wall and plaster and floor are now drying out.

Me, I am just thawing out. The temperature has climbed to 18C in my study. I wanted to do several things today, but events and people have diverted me again!

So before I forget, let me type this in...


USB bootable stick creation in Windwoes

Insert a USB flash drive into your computer:-

Start a Command Prompt as an administrator (right-click on the entry and select Run as administrator) and type 'diskpart' and then press ENTER.

Next, type the following lines a line at a time, pressing ENTER at the end of each line after the command has completed:

DISKPART> list disk
DISKPART> select disk X
[Note: X is the number for your USB flash drive you obtained from the list command from the previous step. ]
DISKPART> clean
DISKPART> create partition primary
DISKPART> select partition 1
DISKPART> active
DISKPART> format FS=NTFS
DISKPART> assign
DISKPART> exit

Next you need to make your USB flash drive bootable.
Start another Command Prompt as an administrator and navigate to the boot folder of the Windows 8 ISO image then type the following:
bootsect /nt60 X: [Enter]
[Note: Where X is the drive letter for your USB flash drive]

From a Command Prompt type the following:
XCOPY X:\*.* Y:\ /E /J /H
[Note: Where Y is the drive letter for your USB flash drive and X is the drive letter of your mounted Windows 8 .ISO file]

Amateur Radio in the 21st Century [1]


As I write this, we are still without power after an hour. What made me write this? Well I thought of this subject this morning. All day it has been at the back of my mind. Something for the younger and newcomers to the hobby of “Amateur Radio”.

In the old days, that is before 2000, we amateurs “hacked” our hardware. Whenever someone threw away some thing that we could use, we 'acquired' it. Adapting wartime radios, assembling kits or developing new hardware, we 'hacked' it.

Last century as a constructor you could drive into Johannesburg and visit a component store. Here on the West Rand, you could drive to the top of CR Swart and visit “Vidi-Kits”. These stores have mostly disappeared or service our small electronics companies. Our market here in SA is minute in comparison to a major city in Europe or USA. It is not big enough to support the small number of constructors or electronic enthusiasts. All the components are imported. Attracting import duty. With the exchange rate not in our favour, the value of a component is way beyond a youngster with pocket money or a pensioner.

Some time ago, I suggested to some members that the only way 'we' will acquire components in future, will be by taking electronic hardware apart. After all some Africans are already gaining notoriety on Youtube constructing wood-burning-cutting laser devices using DVD writers! Whilst others [Germans] are tutoring hackers in CNC machines using parts scrounged from CD/DVD drives and mice [the computer kind!].


Component Mining

A lot of hardware survives a catastrophic failure or electrical surge. Ironically the fuse in the ATX power supply used in most modern desktop PC's, never blows! Most of the transistors are re-usable in virtually any application. They were supposed/reckoned to last 150 years in the 1960's. Most will lie unused in a landfill. Certain IC's will also provide a long and useful life, if you can determine the function of the IC from the obscure number. Fortunately for you these days we have very good search engines on the Internet. A small IC inside a CD-ROM drive turned out to be a 300 milliWatt stereo audio amplifier.

A lot of the cases or housings can be re-used. The metal [thin!] box the ATX power supply uses can house a variety of constructed projects. The power supply used in old [out of date] networking product can power a lot of TTL and CMOS circuitry. Usually these are non-switch-mode power supplies. Therefore they are 'RF clean'.

Old television sets, radios and computers, can provide suitable parts for use in a multitude of projects. Sometimes the construction or assembly can be obstinate in getting at the parts. Expertise is quickly gained after a few mishaps. At the very least this will improve your soldering! De-soldering joints is not an art but a skill. After the first dozen components it becomes second nature to apply sufficient heat and some new solder, to release that 1% resistor from the PCB.

More to come ...


2016-08-04

Amateur Radio in the 21st Century.

Hi All

I have decided to write articles about the hobby. Based in South Africa and relevant to "hackers" of the veteran sort and newcomers to the hobby.

It has become obvious over the last 30 years that the hobby has a shrinking number of "young blood". That is not an ageist term and does not refer to the youth of today. But the "newbies" to the hobby.

The 'hobby' has grown in appeal to certain interested people. Especially with experimentation and communication. No longer confined to H.F. or slow speed analogue modulation. Our hobby has grown in various parts of the world and shrunk in others.

My personal activity has always been hardware 'hacking'. With writing software coming a close second. With the local electronic market at the end of an expensive exchange rate pipeline, it has become almost impossible for low income enthusiasts to build anything. I hope to change that.

With this in mind, let me know what you think.

73
John Brock ZS6WL