“An Iambic Keyer”

The November-December 2011 issue of TCA (pages 23-26) features the article “An Iambic Keyer" by Allen Wootton, VE7BQO. Details of the software and its interaction with the circuitry are provided in the fully annotated program which has been recently updated by the author. For more information see the letter by Allen in the "Feedback" section of the May-June 2012 TCA (page 5) which was written in response to an inquiry by Jeff Davis, VE3COJ:

Keyer 18 (zip file) (5.75 kB)

“Microcontroller Projects for the Radio Amateur”

The May-June 2011 issue of TCA (pages 20-23) featured the article “Microcontroller Projects for the Radio Amateur" by Allen Wootton, VE7BQO. The Assembly Language Programs mentioned in the article are available in the zip file provided below:

Microcontrollers (zip file) (7 kB)

“Digi-Mode: PSK”

The March-April 2011 issue of TCA (pages 35-38) featured the article “Digi-Mode: PSK" by Bill Karle, VE4KZ. Larger, colour versions of the images used in this article are available in the zip file provided below:

Digi-Mode PSK images (zip file) (208 kB)

“A 20 Watt HF Amplifier”

The November-December 2010 issue of TCA (pages 25-31) featured the article “A 20 Watt HF Amplifier” by Allen Wootton, VE7BQO. The Parts List which accompanied the article is available in the file below:

Amplifier Parts List (pdf file) (75 kB)

“Introducing Microcontrollers To Your Amateur Radio Club”

The January-February 2010 issue of TCA (pages 43-47) featured the article “Introducing Microcontrollers To Your Amateur Radio Club” by Dave Green, VE3TLY, David Conn, VE3KL and Mike Kelly, VE3FFK. A sample of the PICAXE programs that were used in the Ottawa Amateur Radio Club's project have been provided at the link below. The programs all open in Notepad. These programs use ordinary hardware such as displays, keyboards and an interface program to a PC (RealTerm). All of the software that was used in the project is free.ink.

Note: After you download the file provided at the link below, open the Word file and then right-click on each icon for the appropriate file and then select “package objects” and then “activate contents”. You will receive a warning indicating that the “package that you are about to open is a file type that can be unsafe”. Since none of the files included are executable files please ignore the warning and click on OK and the file will open in Notepad.

Picaxe (Word .doc file) (63 kB)

“On The Bench”

In the column “On The Bench” by Frank Merritt, VE7FPM (“The Receiver Front End”, page 27 of the November-December 2009 issue of TCA), Frank writes the following:

“Over the years, while radio receivers have improved very much we find that there are few real standards to evaluate the operation of receivers. Some standards have evolved to produce more or less sensible reviews. Unfortunately, not all manufacturers make available measurements that are of common nature. An example of this is the review of the IC-707 receiver that was provided by Peter Hart, G3SJX, in the April issue of RadCom 1994.”

A copy of this review has been provided to us by RadCom magazine and is being reproduced by kind permission of our good friends at the Radio Society of Great Britain. Thank you! The article is available as a pdf file at the following link:

Peter Hart, G3SJX – IC-707 review 9404 (693 kB)

“The Semi-Vertical Trap Antenna”

In response to a letter from Don Dorward, VA3DDN (page 5 of the November-December 2009 issue of TCA), Bob Rice, VE3HKY, refers to an article entitled “Which Aerial” by B.A. Watling, G3RNL, which was included in the March 1968 issue of Radio Communication magazine. We have been able to obtain a copy of the article and it is being reproduced by kind permission of our good friends at the Radio Society of Great Britain. Thank you once again! The article is available as a pdf file at the following link:

B.A. Watling, G3RNL – “Which Aerial” (1.1 MB)

“A Compact, Versatile, Multi-Mode 'Grab & Go' Kit”

The May-June 2009 issue of TCA included the article “A Compact, Versatile, Multi-Mode 'Grab & Go' Kit” by John Brodie, VA7XB. On page 54 – 12th paragraph a diode described as a “Zener” in line 5 should be “Schottky”. In addition an incorrect photo was used. The article has been updated and it is available as a pdf file at the following link:

SEPAR (1.83 MB)

“On the Air with Flare”

The May-June 2009 issue of TCA (see pages 49-51) also included the article “On the Air with Flare” by Alan Macdonald, VA3TET.

A colour version of the article is available as a pdf file at the following link:

Flare (9.24 MB)