Why was my Page De-Listed

I pulled up one of my To-Do lists, sort of; add these companies to these pages [last accessed 2006].
I don't make To-Do lists any more, a few years ago I just started putting the data in an email and saving it as a draft. But I'm not blogging about the amount of data I have sitting around waiting to be added.

I checked one of the companies listed to see if it had already been added to the web site, on-site Google search indicated it had not. So I navigated to the 'manufacturers listing' to add the new company. Well guess what, the listing was there [Component Manufacturers]. So I see that the page has no Page Rank, but I can also conclude that the page will not show in Google search results [which is worse]. Although the page does exist and provides site visitors with data about the companies residing on that page, off-site users will never find the information because it will not come up in a search.
As with all pages in the Manufacturers Listing, the page has been on the web for many years. I don't understand why I can't get them listed. I do have pages pointing to them and they do get updated every now and then. I even have those pages listed in the Engineering Site-Map, but because Google uses 'no-follow' on Google Sites the link does me no good.

Although it might defeat the purpose of the page, I guess I could find some kind of text to add to the pages.
Other wise I have no way to protect the page from the computer algorithm deciding to list it or not.

Test Equipment Manufacturers

Just at random I figured I would check how the small section of Test Equipment Manufacturers was doing. The page count, or the number of pages in the section has been stable for a while. The last addition was Thermal Test Chambers added back in Feb 2008. Before that the Frequency Counter page was added in Nov. 2007. All the other pages predate those additions and never showed up in the other blog...

So which page is doing the worst so far this year; LXI Test Equipment. Now I just saw an article, from last year, about how LXI was growing but I can't tell from the hits I'm getting. Also because I always update a page I blog about, a new manufacturer was added, which seem to be pushing LXI-VXI. It was my impression that LXI was competing with the HPIB interface. The difference being small, but HPIB gear is normally stand-alone equipment and VXI cards embedded in a chassis.
After that the page covering Thermal Image Manufacturers did the worst.
The rest of the pages in the section are listed below.
Spectrum Analyzer Manufacturers.
RF Power Meter Manufacturers.
OTDR Manufacturers.
Cable Tester Manufacturers.
Protocol Analyzer Manufacturers.
Used Test Gear.

While getting these links off the site I did notice that the page on Cable Testers has no page rank, not sure what is wrong here. The Cable Test page received more hits than five other pages in the section [which is not saying much] over the last 30 days. I see in Webmaster tools that no other external page links to it, that would effect the page rank.
Looking at last years data, these three pages did not even receive 1 visit per day [less then 365 page hits]:
LXI Test Gear, Thermal Chambers, and Frequency Counters......

Blu-ray disk player recomendation

I think it's finally time to purchase a Blu-ray disk player. Not really sure why I've been waiting so long. Of course when the players first came out they were over priced, but that was a while ago.

Some time later I heard that Blu-ray players took forever to boot the movie up, which stopped me from making any purchased. Now I see that they want to increase Blu-ray disk storage space from 25GB to 33.4GB. However it appears that any Blu-ray player would require a firmware upgrade. I also see that by next year there will be 3D Blu-ray players, which also tells me that I would also need a 3D TV [what ever that is] and 3D movies. The 3D Bluray specification was released in December 2009.

I assume I want a Bluray player that plays a number of formats
~ BD Live; Netflix-ready; Pandora-ready; Blockbuster-ready; plays BD-ROM, BD-R, BD-RE, DVD-R, DVD-RW, CD-R, CD-RW discs

Interfaces Required
HDMI,
DVI,
USB,
Component Video,
Ethernet, for the Internet.
Not that I would ever use one but;
Internet Connect-able.

Interfaces not required
S-Video, the interface is outdated.
Firewire, not realy used by any one.

Now it my seem a bit odd but I would also like to stay with Sony. A lot of my gear is already Sony, so it kind of makes it easy getting the remote to work. Plus my remote is a Sony Remote Commander [RM-AV3000]. Now the remote is a little dated now, but I see no reason to get a new remote, as I already have a dozen other remotes that of course I don't use.

Pageview Counter Data

I happened to be updating the Antenna Tracking System pages.
So I opened up the Pageviews from Google Analytics filtered by 'antenna-tracking'. The first thing I noticed was that those few related pages don't receive many pageviews, maybe 10/day at best. The first recorded page-view received was on September 7 2007. Now that date occurs before I started the Engineering Page Additions blog, so I checked to see if any of the pages were ever mentioned. A few of the pages were listed in regards to a new page addition on Waveguides [post], back in 01/01/09.

So the point is why are these several pages not getting any pageviews and why are the pageviews flat [and low] over the last few years. Just by adding the links below I see one problem, as a few of the pages only have one manufacturer.
Antenna Tracking Systems; Main section page.
.... Antenna Towers;
....  RF Amplifiers; High Power Amps.
.... Antenna Controllers; Positioning Gear.
.... Light Antenna Pedestals; 
.... Medium Antenna Pedestals;
.... Heavy Duty Antenna Pedestals;  
...... Waveguides; .
The first thing I did was update a few of the pages, by adding new manufacturers. However I could not up-date all the pages because I could not find many companies making antenna pedestals. Companies want to produce systems, not just pedestals.

The second thing was to add the page addresses in this blog posting. I'm not saying that so many people read this blog that the page views will increase. But that Google will see an external link and may give the page more importance.

Oh, and by up-dating the page I showed Google that the pages are 'fresh'. You may have noticed when doing a search that Google postings show the date [listed on the page] that it was last updated. That fact tells me that Google is looking at this date, and may be taking note of the date.

So I added the pages in 2007, blogged about some of them in 2009, and now re-listed them in 2010 and corrected a number of short comings. I even added two more page to page links on the site.

Graphic; a Servo control unit.

Proprietary Embedded Board Formats

I just happened to be checking a few of the COTS Board Manufacturer pages today. I noticed that the few pages I picked to update, at random, were receiving almost no incoming visits. It only took a few minutes before I realized that the three board formats I had updated were all proprietary standards. Really proprietary board formats, because I don't know that any board standard was ever released ~ other than a detailed data sheet so the board could be designed into an embedded system.

So I opened the STX Board Format page to do a routine update, or just to check to see it was up-to-date. Anyway I also opened site analytics to see how the page was doing for visits. That  board format receives almost no visitors, then I started to wonder why that was. That's when I noticed that the format was proprietary in nature.

There really is no reason for someone to visit my site for a board format that is only produced by one or two individual companies, unless they don't realize the standard is proprietary. So I can understand why the incoming visits to that page are so low. However; on the positive side, by listing the standard on the site the information is there to review if it ever comes up in conversation. That is, I don't have to claim ignorance, within minutes I know what the STX board is just by pulling up the page.

I figured I would then check a few other proprietary board standards, like E2Brain. Same story with this industrial format, except that this page received even lower page views by 30%. I pulled up the PISA board standard next. Now to my surprise the PISA format was getting 3x the page views even though I figured this format was obsolete. The PISA slot format is based on a modified PCAT slot connector, which by definition implies obsolesce because the industry moved onto PCI many years ago.

I don't have a point here, other then to indicate that some pages will never do well on the web, but they still deserve a place on interfacebus to insure the topic is covered; Industrial Embedded Board Formats.
I did make sure that the page clearly indicated that the board formats were proprietary......

Graphic; Single Board Computer [SBC]. Public Domain.

Zero Google Page Rank for Component Vendors

There are a number of distinct sections for topics on the web site. One section just lists manufacturers or vendors in alphabetic order. Because it's a section consisting of about 100 pages, I track it.

Back in June of 2008 I posted a listing of all the pages with in the section that had a zero Google Page Rank: Page Rank and Listing of Manufacturers. Guess I'm checking again.... I really see no improvement in the component pages yet.
Page hits have fallen by 50% from Jan. 2007. But the Bounce rate as decreased by 50% as well [which is a good think]. Of course the 'A' components page gets the most hits, followed by the page that covers 'D' vendors, and so on.

Component Manufacturers with no Page Rank:
Equipment Manufacturers, Ae [A2].
Equipment Manufacturers, Amd [A4].
Equipment Manufacturers, Ap [Ap].
Equipment Manufacturers, Ar [A6].
Equipment Manufacturers, Asq [A7].
Equipment Manufacturers, Av [A8].
Equipment Manufacturers, Be [Be].
Equipment Manufacturers, Bi [B1].
Equipment Manufacturers, Bl [Bl].
Equipment Manufacturers, Br [B2].
Equipment Manufacturers, Cm [C3].
Equipment Manufacturers, Con [C4].
Equipment Manufacturers, Cp [C5].
Equipment Manufacturers, Dem [D1].
Equipment Manufacturers, E.
Equipment Manufacturers, Ec [Ec].
Equipment Manufacturers, El [E1].
Equipment Manufacturers, Em [E2].
Equipment Manufacturers, Ev [E4].
Equipment Manufacturers, Em [F1].
Equipment Manufacturers, Ga [G].
Equipment Manufacturers, Ge [Gen].
Equipment Manufacturers, Gi [G1].

I stop checking all but the main page for each letter. But I don't see any rank for any of these pages listed below.

Equipment Manufacturers, H.
Equipment Manufacturers, J.
Equipment Manufacturers, K.
Equipment Manufacturers, L.
Equipment Manufacturers, N.
Equipment Manufacturers, O.
Equipment Manufacturers, P.
Equipment Manufacturers, Q.
Equipment Manufacturers, R.
Equipment Manufacturers, S.
Equipment Manufacturers, U.
Equipment Manufacturers, V.
Equipment Manufacturers, X.
Equipment Manufacturers, Y.
Equipment Manufacturers, Z.

So many of these pages were just updated. So any bad links have been removed and replaced with just a text listing. I've also been adding text to indicate the date a company was acquired by another manufacturer. Why are these pages lacking any page ranking.

So this listing will provide yet another link to the pages that require a ranking. More external links mean a page rank? Maybe the number of links on each page are bleeding page rank, but what would be the point with out the links.

Any way, the updates over the last few months have not been picked up by any search engine yet.
-----------------------------

Resistor Manufacturers

As part of interfacebus, I've had a page covering Manufacturers of Resistors on the web for about ten years now. The page covering Resistors is well established after 10 years on the internet

The Resistor vendors page grows in size or reduces as links are added or removed. The other day four 'redundant' manufacturers were removed from the listing as they all pointed to the company that acquired them. Normally I'll leave a reference to a company that was purchased so people can still find the new company, but after awhile the old link gets removed.

From the "What's New blog" I see a new page dealing with Current Sense Resistors was added in April 2008. Adding a related page to resistors means removing all references to Current Sense Resistors from the main Resistor listing, so that they only show up on the new page, other wise both pages would appear to cover the same topic. Of course removing any information relating to current sense resistors reduces the amount of text from on the main resistor page.

April 2008 also saw a number of new pages that related to Resistors but did not require information being drained off the main resistor page. The new pages provided more incoming links [external pages linking to] the Resistor Manufacturers page. Incoming links should help a page gain visits by providing additional ways to find a page topic. How ever at the same time similar topics on the same web site could end up dividing the traffic between all related topics.

The point is I see a reduction in visits to the Resistor Manufacturers page over the last few years. Page views in 2006 seemed flat, but appeared to start decreasing from 2007 on. Page visits look stable from July 2008 on but are down 60 percent.

Page Rank & Listing of Manufacturers

One of the sections of the site is a listing of Manufacturers in alphabetic order, instead of by topic. The alphabetic listing of Manufacturers spans 94 pages. The section received 1,255 pageviews in the last 30 days, and 8,205 page views this year. The alphabetic index page, which also happens to be letter 'A' receives most of the hits, and the rest are spread over the alphabet.

The section help people find companies when they might not be sure of the name, and it indicates who may have purchased the company if it changed hands. It's a lot of work keeping all the links active and valid, but it does seem to serve a purpose.

Any way, several months ago I broke up many of the pages to make them smaller, reducing the number of links per page. The new pages started with a zero page rank, which is normal, but they still have not recovered. Worse still, I checked one page today and the content didn't even show up during a search ~ meaning the page was not even indexed by Google.

Pages with a zero page rank:
Engineering Manufacturers starting with 'Amd'. html code updated, links checked ~ no issues..
Engineering Manufacturers starting with 'Asq'. links checked ~ no issues..
Engineering Manufacturers starting with 'Be'. html code updated, links checked ~ no issues..
Engineering Manufacturers starting with 'Bl'. links checked ~ no issues..
Engineering Manufacturers starting with 'Br'. links checked ~ no issues..
Engineering Manufacturers starting with 'Cm'. links checked ~ no issues..
Engineering Manufacturers starting with 'Con'. html code updated, links checked ~ no issues..
Engineering Manufacturers starting with 'Cp'. links checked ~ no issues..
Engineering Manufacturers starting with 'Dem'. links checked ~ no issues..
Engineering Manufacturers starting with 'Ec'. html code updated,links checked ~ no issues..
Engineering Manufacturers starting with 'El'. links checked ~ no issues..
Engineering Manufacturers starting with 'Em'. links checked ~ no issues..
Engineering Manufacturers starting with 'Fm'. links checked ~ no issues..
Engineering Manufacturers starting with 'G'. html code updated, links checked ~ no issues..
Engineering Manufacturers starting with 'Gen'. links checked ~ no issues..
Engineering Manufacturers starting with 'Gl'. links checked ~ no issues..
Engineering Manufacturers starting with 'Go'.
Engineering Manufacturers starting with 'Hb'. html code updated, links checked ~ no issues..
Engineering Manufacturers starting with 'Hj'.
Engineering Manufacturers starting with 'Il'.
Engineering Manufacturers starting with 'In'.
Engineering Manufacturers starting with 'Int'.
Engineering Manufacturers starting with 'Intel'.
Engineering Manufacturers starting with 'Jd'.
Engineering Manufacturers starting with 'Ke'. html code updated, links checked ~ no issues..
Engineering Manufacturers starting with 'Ki'.
Engineering Manufacturers starting with 'L'. html code updated, links checked ~ no issues..
Engineering Manufacturers starting with 'Mo'.
Engineering Manufacturers starting with 'Nik'.
Engineering Manufacturers starting with 'Oo'.
Engineering Manufacturers starting with 'P'. html code updated, links checked ~ One bad link..
Engineering Manufacturers starting with 'Po'.
Engineering Manufacturers starting with 'Ram'.
Engineering Manufacturers starting with 'Ren'.
Engineering Manufacturers starting with 'Sen'.
Engineering Manufacturers starting with 'Sig'.
Engineering Manufacturers starting with 'Sk'. html code updated, links checked ~ One bad link..
Engineering Manufacturers starting with 'Sp'.
Engineering Manufacturers starting with 'Tb'. html code updated, links checked ~ One bad link..
Engineering Manufacturers starting with 'Th'.
Engineering Manufacturers starting with 'Us'.
Engineering Manufacturers starting with 'V'. html code updated, links checked ~ no issues..
Engineering Manufacturers starting with 'Ve'. html code updated, links checked ~ no issues..
Engineering Manufacturers starting with 'Vi'. html code updated, links checked ~ no issues..
Engineering Manufacturers starting with 'Vm'. html code updated, links checked ~ no issues..
Engineering Manufacturers starting with 'Wi'. html code updated, links checked ~ no issues..
Engineering Manufacturers starting with 'Z'. html code updated, links checked ~ no issues..

Wow, 47 pages with a Google page Rank issue ~ that's not good. But what is the problem with the pages?

I did notice that the entire section declares xhtml 'strict' coding, so I updated a few to 'transitional' coding today. The pages will validate declaring 'transitional' coding, but that can't be the issue or they would all have a zero page rank.

Any non '.com' web site link has a "rel = nofollow" in the link so even if the link were bad Goggle would ignore it. The 'rel=no follow' must be on 20% of the links, making them save regardless.

I'm running Xenu tonight to check the site for bad links, but that program will not indicate if some other site has taken over an address ~ so I'll have to hand check each link to insure the page opens to the site listed. Xenu reports 8 bad links (0.13%), with 5937 good url's.

I hand checked a few pages, see the text above, but I don't see any issues. I don't mind so much about losing the page rank, but I would like to have the data searchable. I could be missing a number of visitors because the page are in Google's supplemental listing.

Operating Fuses using AC or DC Voltages

I was reading one of the usenet groups the other day, and came across a posting I replied to. The poster was asking about available voltage ranges for fuses {AC voltages}, as he could not find the [absolute] correct voltage rating for a fuse. My reply was basically a quote right off the page for Manufacturers of Fuses.

"The voltage rating of the fuse does not indicate the operational voltage of the fuse. The voltage rating determines the maximum voltage that will not jump the gap between the elements after the fuse has already blown. So the fuse will operate at the rated voltage and any voltage below the rating. "

Someone replied back indicating that in fact I was not correct and that;

".. DC is a more severe condition. ... You should not use an AC rated fuse in a DC circuit. ..."

Followed by another poster who had this to say;

"The AC/DC differential tends to be glossed over a lot .... . One way this shows up as physical difference in AGC style fuses is that DC rated fuses are often ceramic rather than glass, presumably to contain the arc."

I took note of that reply and turned to the internet to research the issue. I came across a site that seem to indicate the same thing I was saying. In the mean time others replied as well. I posted the quote I found on the internet and also a quote from a US Military Standard.

"... once the fuse has opened, any voltage less than the voltage rating of the fuse will not be able to "jump" the gap of the fuse. Because of the way the voltage rating is used, it is a maximum rms voltage value. ..."

MIL-PRF-23419: Fuse selection: The following steps should apply in the selection of a fuse for any application: Step 1: Select a fuse with a voltage rating equal to or in excess of the circuit voltage.

Ya know, if it's good for the government. In fact the third section of MIL-PRF-23419 indicates this:

1.2.1.3 Voltage rating. The voltage rating is the maximum dc or ac root mean square (rms) voltage for which a fuse is designed (see 3.1). The voltage rating is identified by a numerical value followed by the letter "V".

In fact if one of the "/" documents are referenced you'll find that the maximum voltage rating provided does not indicate AC or DC values, just 125 V [MIL-PRF-23419/H].

It appears that the newsgroup thread has ended [at least until the week end], but I kept looking into the voltage issue. I came across data that I intend to add to a new page covering the Difference between AC & DC Fuses. Because of this blog entry, generating that new page, up-dating the sitemap, and adding a new page to the What's new Blog; the new page is just a copy of a per existing page with a new page address. I should get some data out there within 12 to 24 hours.

Caution; always check the IEC, NEC or any other standards body that regulates Fuses. Never rely on the web for information when it comes to personal safety.

Web Page Updates

With the addition of the page covering Manufacturers of Thermal Chambers, I also added those 'few' companies to the appropriate OEM alphabetic listing. While adding those new links I also noted pages that contain an old google search bar or pages that could use a new referral link, or pages that still contain html comments [to save server bandwidth]. Pages that were up-dated in the
Alphabetic Manufacturers section;

Manufacturers 'Br',
Manufacturers 'Ea',
Manufacturers 'Ec',
Manufacturers 'El',
Manufacturers 'Emco',
Manufacturers Eon,
Manufacturers 'Tele',

Two additional companies were added to the PON IC's manufacturers page. A few words were added to the FTTH Description page, now linking to the Ethernet in the First Mile page. A number of Engineering Acronym pages were updated, this being but one example. Also all the IC Packaging pages were up-dated; The MEMS [MicroElectro-Mechanical Systems] had a new oscillator manufacturer added.

When required the pages received a new search bar, had hidden comments deleted, HTML code fixes and so on. Any how, other than posting what pages are changing this post serves a higher purpose, right. The posting serves to provide another external link to these pages which is always a good thing, perhaps insuring a page rank. It pings the search engine to check these pages as the engine reads these page....

The point is not to list all 25 pages that were updated today, but hit the highlights. Let viewers know what is going on and at the same time serve a dual function of working SEO issues ~ optimizing the pages for Search Engines, either on my web site or from this site.....

Oh, if you read this blog, Bandwidth is 60kB/visit, still growing after all my work to date?

Bandwidth vs Low Page Views

Yesterdays blog showed some site stats concerning low page views or page impressions, several hundred pages receiving less than 100 page views a month. So I wanted to list a few examples of what pages were performing so poorly.

I have a section within the web site that provides an alphabetic listing of manufacturers. Years ago it started out as just four very large web pages, but over the last few years have been divided up into 88 individual pages. The main landing page is Electronic Manufacturers, letter 'A', with links to all the other letters. So, for this section of pages, that landing page receives the most 'hits', 372 page views [last month]. The page views drop for all the other pages, as a visitor clicks on the desired letter to find the manufacturers their looking for. The next best performing page is 'D', at 49 page views. In fact only 15 of 88 pages saw more than 20 page views, the other 73 pages receive less than 20 page impressions. The section may not see much action, but people do find it useful as it indicates who may have acquired a company that no longer resides on the web.

Anyway there is another post from Nov 3 'Server Bandwidth' that also mentioned that same section of pages. The manufacturers section uses a page format with 'to many' graphics and the previous bandwidth post pointed that out. The server "Webalizer" report indicates the top 30 files that are taking up the highest bandwidth. Back in Nov. one of the files was the graphic on the top of the page. Now that the graphic was ported over to Google page creator [and other changes over the last few months] the report is now showing 5 of the smaller graphics in the top 30 files. It's time to port those pic files over to my page creator account so they drop off that server and not my web site server.

No Page Rank

I came across a page on the site yesterday that does not yet have a Google Page Rank. The page covers RF Phase Detector Manufacturers. ~ Not very well because the page only lists one manufacturer.

Any how I always assume waiting 4 months to receive a page rank, maybe 5 if the spider is running late. The 'Last Modified' date on the page is 3/17. All the other pages in that section already have a ranking: RF Device Manufacturers.

The Phase Detector page shows up in a Google search so I know its been spidered?

Of course all the new pages added with in the last few months don't have a page rank either, but I expect that.

New Posts

More new pages added to www.interfacebus.com

The ZigBee page is blank, but I should get to it this week end.
http://www.interfacebus.com/IEEE802-15-4_ZigBee_Description.html

The Protocol Analyzer page also only has a few companies.
http://www.interfacebus.com/Test_Equipment_Protocol_Analyzer_Manufacturers.html
http://www.interfacebus.com/COTS_InfiniBand_Board_Manufacturers.html
Many of the InfiniBand products I'm finding are server boxes and not boards.
http://www.interfacebus.com/WaveGuide_Manufacturers.html
http://www.interfacebus.com/High_Definition_Audio.html

I should be up-dating each of these pages this week, or as I have more time.

New Page Additions

I've been adding some new pages over the last few weeks;

http://www.interfacebus.com/HTX_Daughter_Card_Manufacturers.html

http://www.interfacebus.com/COTS_VPX_Board_Manufacturers.html

http://www.interfacebus.com/COTS_VXS_Board_Manufacturers.html

http://www.interfacebus.com/Test_Equipment_Thermal_Imagers_Manufacturers.html

http://www.interfacebus.com/GPS_Receiver_Manufacturers.html


http://www.interfacebus.com/WebCam_Manufacturers.html

Battery Manufacturers

In addition to the main listing for battery manufacturers, a new page was started that just covers Industrial Batteries

I also added a new page to cover Circuit Breaker Manufacturers, which is off the main Mechanical Fuse Manufacturers page.

I up-dated this page to show the new address for Circuit Breakers.

VME Bus

The VME interface still seems to be in high demand. There are a number of pages which deal with the VME bus, and the manufacturers which produce components and equipment on http://www.interfacebus.com/.

The main page that deal with the topic is the VME Bus page. Additional pages include Board manufacturers, Chassis manufacturers, Backplane manufacturers, and a number of pages providing Connector Pinouts.