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JavaScript®
Electronic
Notebook

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I have created this page for two main reasons. First, to help keep track of the changes I am making to this web site and things that may need fixing. Secondly, so other people accessing this web site can see quickly if there is something new added to the system.

I haven't fully decided on the format of this page but it should list things with the most current items at the top. Older changes will be pushed down. I will try to include links so you can go right to the new stuff.

November 28, 2004

Well, in the past month I have made so many changes that I couldn't document each one as I made them. The overall format for all of the pages have changed. I made it easier to navigate from page to page. You can get from any-page to any-other-page in usually one click.

I have eliminated a lot of the <textbox> structures and switched over to dynamic paragraphs. Output from calculations are now inserted directly into descriptive and highlighted sentences, instead of <input> boxes.

October 12, 2004

Once again I made some changes to the VHF/UHF Yagi Antenna Design page. The changes were to the web pages that are generated when you press the view buttons. I split the view pages into two colums and used some new graphics for the antenna elements instead of the simple ascii characters.

On the view pages for the ARRL designs, I removed the mast design and gave it it's own view page. As with the design view pages, I split the view pages into two colums and used some new graphics for the antenna elements instead of the simple ascii characters.

October 6, 2004

I added a page to the Antenna section. The page is intended to describe the physical requirements for the VHF/UHF Yagi Antenna Feed. Specific dimensions, except for the length of the 1/2 Wavelength Phasing Loop, are not included because that is to dependent on the materials available to the builder. Only the Folded Dipole type of driven element is discussed. Other types can be used, but that will have to wait till I have more time.

September 29, 2004

I finally finished the pages for the High-Pass Active Filter and Band-Pass Active Filter. The High-Pass page gave be a problem due to an inefficiency in attempting to reverse calculate a filter. This page doesn't actually do a reverse calculation but just presents an estimate.

The Band-Pass filter, however, does do a reverse calculation, yielding filter response from parts values. This section will, at a later date, be split off to a page that allows users to insert part values and determine filter responses. I'll use some real world examples so you can see that advertised filter specs are not always correct.

September 14, 2004

I finally got my laptop back and all of the data was recovered.

I changed all of the buttons/switches that I had for navigating the site. Rather than graphic buttons I started using the <button> structure. You can make a pretty nice button, complete with custom background, using it this way. It also make them easier to maintain. I have two filter pages to convert yet and then I can delete the old buttons from the directories.

I added a drop down menu system on the Javascript Electronic Notebook front page. This allows the user to skip the index pages and go straight to page.

I finally re-worked the VHF/UHF Yagi Antenna Design page. I changed the overall coloring and setup to match all of the other pages. The navigation buttons were changed and colors adjusted for a more pleasing look. There will be a few more minor changes but not real soon.

I have started to add some statistic buttons to all of the pages. In the end, each page will have one which will allow me to get a better idea of what pages and features are most popular. I had something similar from Bravenet but the stats were open to anyone and their pages were so full of adverts that you could hardly see the data.

August 28, 2004

I upgraded to Windows XP Pro. This also means that I upgraded all of my browsers. I am now testing on Netscape 7.2 and Internet Explorer 6. I have no easy way of going backwards and can no longer test on lesser versions.

My main computer crashed and I lost a little data. Mostly it was just some cosmetic changes and doesn't affect any of the Javascript programs. I will be getting a replacement some time next week.

August 17, 2004

Some small bug fixes were implemented in the VHF/UHF Yagi Antenna Design page. There were some small problems with the element length calculations. Although they were within dimensional tolerances, they needed to be corrected.

August 8, 2004

OK, so it's been a while since I added anything to this page. But, a lot of things have been getting done. I have been busy converting a lot of pages over to the new display format. Overall it seems to look nicer.

My email has been very quiet for the past 2 weeks. Maybe no one is sending me notes, but I did find out that the form-mail I was using is broken. It's been broken for a while so I don't know who I am ignoring. I have switched over to another form-mail and we will see how that works. Several form-mail sites have complained about spammers shutting down their systems. I suspect this is the problem here. Anyway, I appologize to those who tried to get through, but didn't. If you would try again I would appreciate it.

July 23, 2004

Added a new look for the front page. I think it make it easier to read and is a little more pleasing to the eye. If you have any comments on it, Send Me Some Email. These cosmetic changes may turn up on the other pages but I may not advertise them here.

July 19, 2004

I wanted to wait until I had all three, low-pass, high-pass, and band-pass audio filters completed, but I thought I would start by posting the Low-Pass Active Filter page now and the others as I get to them. The high-pass page will be identical to the low-pass page except for the filter type. The band-pass page is actualy complete but I want to go over it one more time.

July 13, 2004

Add a length scaling section to the Center-Fed Half-Wave Dipole page to allow for pruning.

July 13, 2004

More new buttons for the Electronic Notebook front page.

Re-worked the Help page for the Yagi Design program.

July 12, 2004

I came across some output errors in the Short Center-Fed Dipole. The calculations were correct but the metric output was missing some parentheses and converted the measurement incorrectly.

July 11, 2004

Changed the front page slightly by adding some buttons, rather than the icons. I think it looks cleaner but E-Mail me if you disagree because, I'm probably going to change the rest of the pages to look the same.

I'm working on some pages for designing Active Filters, on the side. I have two almost complete but want to finish up a third before I put them up (hopefully this week).

I also included a page on Developing in HTML and JavaScript®. It's still being developed but I thought I would put it out as a start.

July 1, 2004

Added the Electronic Notebook Antenna pages for designing a

Added some new buttons to the Electronic Notebook Index page and some icons to go with them.

June 26, 2004

Added the Electronic Notebook Power Supply pages for designing a

June 23, 2004

Added the Electronic Notebook Inductor pages for determining the inductance of a

June 23, 2004

Added the What's New web page for tracking changes.

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