Folder 0  Miscellaneous

Details of family tree

Please wait for file to load - may take a minute or so.

MVI_1346_Family.AVI

After the file has finished loading (left hand corner give MB in file) press up-arrow and then OPEN

Some family groups starting with the youngest member of our family :

Marion with grand children

Dot and Aidan (Picky) with children and grandchildren

Families of Frank and Marian

Various members of Ed and Bun's family

Adifferent take of Ed and Bun's family with Vin and Pat Garbutt's children

Grand children of Dan and Elizabeth

*********************************************************************************************************

A video presentation of a Field Mill  is a large file  --- takes SEVERAL mins to load

MVI 0662.AVI

This is another experiment. Microwaves is an important subject and this video , MVI 0698.AVI , shows how a Standing Wave detector can be used to see where the microwave energy is going - a strong standing wave pattern indicates that all the energy is being reflected back to the source, a small pattern shows that the energy is being transmitted. Getting the energy out of a line is quite a task. We see that an open line is a very good reflector. BUT by making a gradual change  from a line to the outside world with, say a horn, one can see that most of the energy WILL radiate into space. This process of getting each load to look like the Characteristic Impedance  of the line is called "MATCHING". In years gone by one was happy to get a microwave circuit matched at a single frequency; now we need "broadband" matching and something like a FIREFOX instrument from Keysight Technologies will help us in this task. Please see the TEN excellent videos from Jake Daly and David Von Workum on  "Firefox Fundamentals" (www.keysight.com) .

MVI 0698.AVI

The vital piece of theory is given in the article LL where we see that IF THE LINE IS MATCHED then there is no reflected wave.

Another article of interest is the pathway from electronics to microwaves EM  .