Showing posts with label software. Show all posts
Showing posts with label software. Show all posts

Saturday, August 10, 2019

Adobe Flash blocked in Chrome 76

When you now run version 76 of the Google Chrome browser you will see the message shown in the screen shot excerpt below.

Click above to enlarge image.
If you click on Learn more at the right-hand side, you will see a 2017 message about the termination of Adobe Flash late next year.



 As explained in this article, Chrome now blocks Adobe Flash by default.  Flash support has been built into Chrome for a long while, thereby not requiring the user to download it separately from Adobe each time an urgent security update was needed.

Mozilla's Firefox browser will disable Flash starting in version 69.  I already have it disabled in my current version (68.0.1) of Firefox.

Based on what I see on the Adobe Flash Player download page, Flash is still supported in all versions of Windows, along with macOS and Linux. Web browsers other than Chrome may still support Flash, but the number of websites that still require Flash is rapidly shrinking.

If you still use a particular website for a service that is important to you and it will not run unless Flash is enabled, I recommend that you enable Flash only for that particular website.

John





Monday, August 6, 2018

Joining Google Hangout from shared link

Here are some notes from my recent testing of joining a group Hangout on an Apple iOS device via shared link.

First, install the Google Hangouts app. The screen photo below shows the correct app to use, from the Apple App Store. There are 3 other Hangouts apps published by Google.


In order to use the app you must log in with your Google account.

My ham radio friends who meet on 3740 kHz have often used a group Hangout to supplement voice communication with live video and sharing of photos or software demonstrations / assistance. One of the group members starts a Hangout from the app on a mobile device or from a desktop / laptop computer by directing the Google Chrome web browser to hangouts.google.com.  The person starting the Hangout then copies the link for sharing (see image below) with other group members via the chatroom.  The group members can then click on the shared link to launch their Hangout apps and join the Hangout in progress.

This process works smoothly on Windows PCs, using the Google Chrome browser.  Some iPad users are able to join a group Hangout by clicking the shared link in the chatroom, viewed from the Safari browser. I have tested this multiple times successfully with a model A1474 iPad running iOS 11.4.  It is not clear whether older iPad models are able to "join via link" easily or consistently.  I've seen some indication that cookies must be enabled for the Hangouts app to work properly.

A member of a group Hangout can also send a direct invitation to another person via email, using the window shown below. Also, the copied link can be emailed to another person.


Communication between two individuals via Hangout can be initiated from the app by one person simply inviting the other.

Send me a reply if you have questions or comments.

John WA5MLF


Tuesday, March 20, 2018

Customizing arrangement of RCForb windows

Based on discussion and screen shots shared this morning on 75 m, I explored some additional options for arranging and customizing the contents of components displayed in the RemoteHams  RCForb client window.

Below is a screen shot of the arrangement (active portions) I normally use when connected to the w4uoa remote.  These screen shots where made while the station was powered off.
(Click on any image below for a larger view.)


This arrangement has the KPA and KAT windows pinned to remain visible alongside the K3 graphic, as shown in the close-up view below.













This arrangement can be tailored by adjusting the boundaries among the 3 tiled windows, as illustrated below.














It is possible to drag the KPA window or the KAT window (or both) away from the pinned position to any other place on the Windows desktop.


The next screen shot shows the KPA window overlapping the K3 and KAT windows -- not a useful arrangement.  The window can be dragged away from the RCForb window completely, if desired. The pinned arrangement is probably preferred by most users.











A floating window like the above can be returned to the RCForb main window by drag-and-drop as shown below.


Click and hold on the top of this floating KPA window and move the mouse pointer toward the top right. A blue shaded area shows the current position based on the mouse pointer. A cross icon appears indicating possible landing positions for the window when the mouse button is released.













This view shows the selected landing position of the window.
















Another display option is to auto-hide the KPA and/or KAT windows.


This view shows both windows auto-hiding. When the mouse pointer is moved onto one of these tabs, the window will open for viewing, until the mouse pointer is moved away.








This view shows the KPA window pinned, so it displays full-time, while the KAT window is auto-hiding.










Comments and questions are welcome.
WA5MLF


Thursday, September 28, 2017

WiFi Analyzer Apps

Here is a collection of some links to apps that enable you to analyze and troubleshoot your WiFi configuration and coverage at a given site.

iOS
Network Analyzer - wifi scanner, speed test, tools
For iOS devices, but does not have all the WiFi details that are available on other platforms

Mac OS
7 Best Wifi Analyzers for Mac OS

Windows and Mac
9 free Wi-Fi stumbling and surveying tools
Slides 3 and 9 are Mac apps

Android
8 Best WiFi Analyzer And WiFi Scanner Apps For Android

Linux

Also see:
How to Find the Best Wi-Fi Channel for Your Router on Any Operating System





Thursday, June 1, 2017

HF Radio Propagation Modeling

Below is a series of cropped screen shots I collected at 0830 CDT today from the VOACAP map feature of the KE9NS PowerSDR software that I am currently using. My station location is marked with the red star. The predicted signal level scale ranges from blue (strongest) to green to yellow to orange to gray (weakest). Only the 30 m plot has gray contour lines. The 60 m plot has vertical lines that mark two of the defined frequency channels.



















During earlier discussion of this topic, Tom KQ5S told us about the VOACAP propagation modeling presented on the K6TU web site. The link I provided here gives an overview of what's needed to run the model program on the web site.

A little web searching today about "do-it-yourself" VOACAP usage brought the following article from 2004:

Two other search results raised my awareness of the VOACAP dependence on sunspot data and how it is defined and published:
My searching today reminded me that the VOACAP capability is also a plug-in built into the 4nec2 antenna modeling software that I use. I've seen it in one of the program menus, but have not digested the documentation enough to use it.

John WA5MLF

Monday, February 13, 2017

Multi-band Dipole Impedance and SWR

Related to my earlier posting, here are some plots of impedance magnitude and SWR for some variations of the W8JI-style multi-band dipole with balanced line feeder. All cases use a height above ground of 60 ft.

The first two plots below show SWR and impedance magnitude vs frequency for:
  • 220 ft dipole with 220 ft 450-ohm feed
  • 220 ft dipole with 186 ft 450-ohm feed
The color legend at the top right identifies the two curves. Click on the image for a larger view. The SWR data are computed using a 450-ohm source, matching the balanced transmission line impedance. An antenna tuner is used by the operator to match the transmitter's 50-ohm output. The antenna analysis software can be set to use a 50-ohm source (or any impedance for SWR calculation) or can be told to calculate the required (L & C) matching components at each frequency, if desired.

SWR - 220 ft Dipole at 450 ohms













Impedance - 220 ft Dipole















The next two plots are for:
  • 202 ft dipole with 60 ft 300-ohm feed
  • 220 ft dipole with 60 ft 300-ohm feed
In these cases the balanced transmission line has 300 ohm characteristic impedance. SWR data are calculated for a 300-ohm source.
SWR - 202 & 220 ft Dipoles












Impedance - 202 & 220 ft Dipoles














Both plots show the peaks and valleys at higher frequencies for the shorter antenna.

As always, these models cannot predict the exact conditions that will be seen at a typical ham residential installation of HF antennas, due to nearby buildings, trees, fences, etc. not included in the model. A commercial antenna installation with lots of clear area around the antenna (e.g. AM broadcast stations) will have much closer agreement between model and real world. The NEC software has been used extensively for many decades in designing commercial and military antennas, and is applicable to many ham radio antenna designs.

The simple models are capable of indicating the general behavior of a given antenna's shape, dimensions, height, feeder length and impedance. The models also predict the effects of changing a given antenna's parameters. The "cut and try" method is always important to achieving the optimal performance at a given site.

- John




Monday, January 16, 2017

Google Voice & Video - Network Activity

The Windows Resource Monitor provides expanded details of CPU, memory, disk and network activity. A link to the Resource Monitor appears on the bottom of the Windows 7, 8 and 10 Performance tab of the Task Manager. This older article describes briefly the features and displays of the first 4 tabs of the Resource Monitor.

During this morning's conversation on 3740 kHz I joined a Google Hangouts session with W4BXI and explored the Resource Monitor a bit more than I had previously. I looked at the Network Activity tab to see the usage of the Google Talk plug-in that provides voice and video for Google Hangouts. Below are 3 partial screen shots showing the levels of network activity for both voice and video.


This first view shows network activity with a table of processes on the left. (Click on the image for a larger view.) Separate columns show send, receive and total Bytes/sec. For the voice activity in progress you see the average receive rate of 6,856 Bytes/sec. By clicking the check box to the left of googletalkplugin.exe its activity is highlighted in orange on the graph to the right. The receive activity corresponds to 8 x 6,856 = 54,848 bits/sec or 54.848 kb/s, which is very low on the 1 Mb/sec full scale graph.


This view shows the greatly increased average send rate of 61,170 Bytes/sec when I started sending live webcam video. The average rate corresponds to 489,360 bits/sec or almost 1/2 Mb/s. The graph on the right shows the variation in data rate as I was moving the camera around.




This view shows the data rate dropping on the graph when I stopped sending video. Due to the averaging time for the data on the left side, the send rate had not yet settled back to its voice-only rate.



I hope you will think of the Resource Monitor program the next time you are wondering about what is going on in your Windows computer.

- John


Thursday, May 19, 2016

Windows 10 Upgrade Topics

There is much discussion now about recent changes in the Windows 10 upgrade notifications and behavior, and the scheduled July 29 end of the free upgrade availability. Below are some recent articles that address these topics.


An alternative to upgrading in-place is to perform a clean install. This requires more work, but results in better performance and reliability by virtue of not carrying forward the baggage and debris accumulated by years of running Windows 7 or 8. Below are some articles about clean installation.They cover much of the same ground, with some variation in wording. The first link gives important details about the overall process, including how to handle your programs, files and settings. Note: in order to use the media creation tool you must be logged in with an Administrator account.

Windows 10 Guides:
Also see these two Youtube videos:


Friday, January 15, 2016

Linux Distributions and Desktop Environments


We've had recurring discussions on HF radio about Linux, especially following the end of Microsoft support for Windows XP and the arrival of Windows 10. For some Windows users, Linux offers an effective alternative to upgrading or replacing older hardware. I've used Linux for many years on an alternating basis with Windows. Currently I use only two applications at home that do not have Linux versions or equivalents, and my understanding is that they do not run under the Wine software that enables many Windows programs to run on Linux. At my part-time job I am supporting Windows 7 computers, so it is helpful to maintain familiarity with that environment.

Linux provides many opportunities to learn more about computers and networking, and has many capabilities that are less common or are absent from Windows. Occasionally these have been helpful for me to troubleshoot computer hardware and network connections, and have helped to distinguish between hardware and operating system software troubles.

Most users of personal computers can accomplish the majority of their routine tasks with software applications on Linux. System maintenance does require some new learning, but all who use and maintain Windows today had to learn to use it, too.

For my friends who are curious about Linux and want to try it out or even use it part time or full time, I assembled this collection of web links that address the following topic areas:
  • Linux challenges & tips
  • Choosing a Linux distribution
  • Choosing a desktop environment
  • Trying Linux without installation 
____________________________________________________

 Linux Challenges & Tips
  • Why it's not mainstream - This article explores some of the issues that inhibit greater adoption for desktop computers. As noted above, you need to be willing to learn if you want to install and use this operating system. Most Windows users are using computers with Windows pre-installed. There are a few computers available for purchase with Linux pre-installed.
  • Rules for a new Linux user - The author gives some tips for the new user. Her recommendation of carefully choosing your first distribution relates to my second topic area below. She includes a link to a separate article to cover the question "should I use Linux".
  • Helpful Communities - This lists some of the communities that are good resources for finding resolutions to problems encountered. There are general Linux communities as well as distro-specific communities. 
  • Tips & how-to articles: 

Choosing a Linux Distribution

Choosing a Desktop Environment (DE) (e.g. GUI)
You select a distribution and use its included default DE or change the DE after installation.

Trying Linux Without Installation
Many computer hobbyists like to download a Linux distro and try it out before installing. There are two options for this
  • CD /DVD - After downloading the chosen Linux distro ISO (disk image) file you use a program that can burn a CD  or DVD with the ISO file. You can then boot the computer from this disk, but the performance is limited by the slow speed of the optical drive.
  • USB Flash Drive - Better performance is obtained by running Linux from a USB flash drive, but not all computers can boot from USB. Here are some of the available programs for making a bootable USB flash drive with your chosen Linux distro:
 A bootable Linux CD or DVD is a good tool to keep for troubleshooting on any computer.


Wednesday, September 9, 2015

Windows 10 installing without permission

Click to enlarge
I found many references to this issue, reported by folks who are fighting the same upgrade demon.  The screen shot here shows the history of failed upgrades on one of the Windows 7 office computers that I support. This behavior has sometimes bogged down the computer's performance, hampering the user's productivity.






Below are a few of the links with answers that seem to have the following elements in common:
  • Uninstall updates KB3035583, KB2990214, and KB2952664
  • If KB3035583 comes back, uninstall it again, then in the updates available for download and install, right-click on it and select Hide update.If that does not work, see the 3rd link below.
  • Turn off automatic updates to prevent these from installing again. There is an "Optional" update 'Upgrade to Windows 10 Pro' which IS automatically selected. You'll need to manually select future critical / important updates for installation.
Stop Windows 10 upgrade


Windows 10 upgrading without permission


Removing the get Windows 10 icon


Uninstalling a Windows update


Windows 10 may already be on your PC even if you don’t want it






Wednesday, August 12, 2015

Windows 10 Issues & Tips

Now that Windows 10 is officially available, various privacy issues are being discussed, along with numerous tips for upgrading from Windows 7 & 8. Here are some selected articles that may be of interest to those who are upgrading to Windows 10 or purchasing new computers with it pre-installed:
Update 8/21/2015:  Also see:



Tuesday, March 10, 2015

Two online malware scanners

A recent issue of PC World magazine suggested two free online malware scanners as a supplementary check of your Windows PC that may already have installed anti-malware software, or if you are having current malware symptoms:
Free Online Virus Scan - Antivirus Software - Trend Micro USA
Free Virus Scan | Online Virus Scanner from ESET 
I mentioned these to the Monday morning radio group, and used them later on my two desktop PCs that currently have the Avast Free AV installed.


On my office PC, 2006 vintage with two drives, I first rain the ESET online scanner. It ran for 2 hours and appears to check all files. It found several instances of potentially unwanted applications  (listed below) and deleted/quarantined them. Drive C is the newer Win 7 drive; Drive F is the older Win XP drive, which I almost never boot up now. I did a Google search on the reported Win32/InstallCore.QW and found the tally at virustotal.com to be very interesting:
https://www.virustotal.com/en/file/2ca33500c1e3c129aad55a092717a9044cd0e1919e24ce78211ebd4611572826/analysis/

Next I ran the Trend Micro Housecall and it found nothing. It took only a few minutes to run and I'm not sure if it also checks for potentially unwanted applications in additional to the truly malicious stuff.

On the ham shack PC, 2013 vintage with two drives, the Trend Micro Housecall scan found nothing. Then I ran the ESET scan, with the option again set to include potentially unwanted applications in its search. It took just over an hour to scan the two drives (315,385 files). On the older drive F, that was originally in the office PC years ago, it found two potentially unwanted applications. The program automatically quarantined them and gave me the option to delete them upon completion of the scan.

I concluded that both online scanners are worth running if you have current malware symptoms or just want to occasionally supplement your normal resident anti-malware software.  As malware developers and users have become more sophisticated and sneaky with their methods, it is more important than ever to not rely on any single protection method and to be even more vigilant about emails and web links.

==================================================================
Results of ESET scan on 2006 vintage PC.  User names replaced with ****.

C:\Users\****\AppData\Local\Temp\ICReinstall_Evernote_5.7.1.5586_inst.exe   
a variant of Win32/InstallCore.QW potentially unwanted application    deleted - quarantined

F:\Documents and Settings\All Users.WINDOWS\Application Data\InstallMate\{16782E9C-
E344-47BD-
A045-B9BA79870632}\_Setupx.dll   
a variant of Win32/InstalleRex.U potentially unwanted application    deleted - quarantined

F:\Documents and Settings\****\
My Documents\Downloads\aoeprzip.exe   
a variant of Win32/OpenInstall potentially unwanted application    deleted - quarantined

F:\Documents and Settings\****\
My Documents\Downloads\outlookexpress-setup(1).exe   
Win32/DownloadAdmin.G potentially unwanted application    deleted - quarantined

F:\Documents and Settings\****\
My Documents\Downloads\setup-bluegriffon.exe   
Win32/DownWare.W potentially unwanted application    deleted - quarantined

Thursday, March 5, 2015

TPWINLOG 2015 in Windows 10

Click above for large view
TPWINLOG 2015 installed flawlessly in the Windows 10 Technical Preview that I have running in a virtual machine hosted by Ubuntu 14.04 Linux. This screen shot shows the program window displaying some practice contacts I entered for test purposes. I also verified that the Print ToFile feature produces the desired text file.

I don't know yet if I can test the CW send feature with this arrangement.

Sunday, February 22, 2015

Windows 10 Preview on Linux Virtual Machine

Click above for a larger view.


Here is a screen shot of the Windows 10 Technical Preview running as a guest OS in a virtual machine in Ubuntu 14.04. Windows 10 is in the smaller window (1024 x 768) in the center of the wide screen (1920 x 1080) Linux display. It can also be run in full screen mode.

The Kernel-based Virtual Machine is configured to use one CPU core, 2 GB RAM and 12 GB disk space.  The Windows 10 setup asked for 11.1 GB of disk space. After install there was 2.64 GB of free disk space. A bunch of apps were downloaded and installed automatically after the basic Windows 10 installation completed.


At the far left of the Linux screen is the standard Ubuntu Unity launcher (dock). At the far right is the Conky Seamod widget that shows various aspects of resource usage on the host PC.

My reference for setting up the virtual machine was this article. Performance of Windows 10 is quite good under this configuration, and gives a good opportunity to try out the preview version.




Wednesday, August 20, 2014

Java updates -- suppress sponsor offers

Those who use Java on a regular basis know that when a version update is published, its installer offers to include some third-party programs that are selected by default to install. Yesterday I learned from the Security Now netcast that the Java control panel includes an option, in the advanced tab, to suppress the offering of third-party programs. The screen shot below shows the location of this option.

 
I tested it on a PC this morning and confirmed that it works.

-John

Thursday, April 3, 2014

WiFi Tips & Tools

Episode 76 of the Know How show on TWIT.TV covered some good tips and tools for setting up and maintaining your 2.4 GHz WiFi system. (They promised to cover the 5 GHz band on a future show. I'll search for that after completing this post.) There's a brief summary in the show notes -- scroll down the page to the topics: WiFi Tools, AP/Router Setup, and Antennas.  I recommend downloading and viewing one of the video copies of the show. Jump ahead in your video player to 18:51 where the WiFi topic coverage starts. It runs about 13 minutes total.

Update: Now see this discussion of using multiple access points. 

Several WiFi tools are mentioned in the Know How show, to help with evaluating the coverage within your home or business. After viewing the show back in January I added the free WiFi Analyzer to my Android phone. I also like another program inSSIDer that is not mentioned in the show. I've used it with good results on my Windows laptop and my Android phone. The current version 4 for Windows and Mac is available here for $19.99, but the free version that I installed a while back is still available elsewhere. The Android version costs $9.99.

John

Tuesday, May 17, 2011

Updating Vulnerable Software

There is no end in sight to the parade of malware exploits that make use of vulnerabilities in popular Windows-based programs. If you are not sure of your system's vulnerability or don't trust the automatic notifications that you receive from some programs, you should consider running a scan on a regular basis to determine what programs need to be updated. Two facilities that I have used and trust are:
  • FileHippo - You can download popular program updates from their home page, or install and run their free Update Checker for a scan of the most popular programs installed on your PC. You can choose to have it run every time you start Windows or just run it on demand. The results are displayed on a convenient web page where you can click and download any updates you need or want. They include beta versions of programs that you may or may not want to use. This scanner identifies version updates for a select group of popular programs, not every program installed on your system. The updates are not all associated with patching security holes. Below is a screen shot fragment that shows the scan results I obtained today. Click on the image for a full-size view.
  • Secunia Online Software Inspector - This scanner concentrates on identifying vulnerable programs on your PC. It also provides a web page report with links to the updated program versions. It is a Java applet and so requires Java to run. Below is a screen shot fragment that shows the scan results I obtained today. Click on the image for a full-size view.

    Scanning takes only a few minutes on most systems. Downloading and installing the updates may take some time, especially if you have many outdated programs, but all experts in the field of computer security agree that patching vulnerabilities is very important to the overall secure use of your computer.

    Wednesday, March 30, 2011

    PC Software Upkeep

    Our recent morning QSO on 3740 kHz included some discussion of software maintenance on Windows-based PCs. The most important reason for this task is to avoid software vulnerabilities that can provide opportunities for criminals to take control of your PC, either for extracting your personal information or for using your PC in criminal activities, or both.

    We all recognize the need to use and regularly update anti-virus programs. Since no anti-virus program detects every instance of malicious software, you may consider occasionally running supplemental scans with other programs. However, you should avoid installing multiple anti-virus programs as they may conflict with each other. Malwarebytes Anti-Malware has a free version that I've found to be very effective in removing malware on some friends' and relatives' PCs that had other well-known anti-virus programs installed. You may also consider running Spybot Search & Destroy. Note that serious malware infections may require much more aggressive software tools and techniques, up to and including clean installation of the operating system!

    Anti-malware programs should not be relied upon for complete protection. Software updates are often issued to patch vulnerabilities that criminals are exploiting to gain access to computers. FileHippo has a very nice free update checker, a small program that you can download and run to check many of the commonly used programs installed on your PC to find out if updated versions are available. If you'd like a more thorough scan of many more programs installed on your PC, specifically for vulnerabilities, try one of the two free consumer products from Secunia.

    Many web sites offer free or shareware programs that appeal to PC users' wants and needs. Purveyors of malware can also use their own (or compromised) web sites to push their programs. Here are a few trusted web sites where you can download free or shareware programs:
    cnet download.com
    FreewareFiles.com
    FileHippo.com
    One example of a popular utility program available on these sites is CCleaner. I like to use it periodically on my PCs. The publisher's web site encourages you to purchase the program or make a donation, but you can download a free copy from FileHippo or from a separate link on the Piriform web site.

    When installing programs that you download, be sure to pay attention to various options presented during the installation. Some programs will have options pre-selected to install extra web browser tool bars or extra software that you probably don't need. Many programs will pre-select an option to run automatically every time Windows starts. You may want to de-select that option to avoid burdening your CPU with too many things starting and running all the time.

    News about PC software and security can be found at many web sites. You may consider visiting some of the following to see which ones you might want to check on a regular basis:
    Krebs on Security
    cnet
    Kim Komando
    PC World
    MakeUseOf
    ZDNet
    ars technica
    There are MANY more to choose from.

    Finally, be sure to use caution in your Internet usage to avoid the risks that exploit human carelessness and gullibility. See the following sites for well-written guidance:
    OnGuard Online
    GetNetWise
    These two sites are well-suited for sharing with your family members and friends.

    Wednesday, January 13, 2010

    Selected computer security tools

    Here are a few links about certain computer security tools that I have repeatedly suggested to friends and family members:
    • OpenDNS -- Can be set in your router or in each PC individually. For a laptop that is used elsewhere to access the Internet, it should be set up in the laptop even if set up in the home router. For a household with many PCs, especially children's, the router may be a good place to set it. The optional user account can enable more powerful and customized filtering of web sites.
    • Password Managers
      • SplashID -- I use on my PDA. It syncs with the version on my PC.
      • Password Safe -- Free. Duplicates what I have on SplashID. Has a nice Auto Type feature that provides single-keystroke entry of userid & password at a web site's log-in screen.
      • LastPass -- A web-based password manager; I have not used it.
    • File Shredder -- Can process individual files or entire folders and their subfolders with contained files. Example of the latter usage is to shred the entire "Documents and Settings" folder of a PC being recycled or discarded.
    • CCleaner -- Excellent product for cleaning up software debris that accumulates in your PC.
    • Drop My Rights -- A free utility from Microsoft that reduces the administrative rights of a web browser, email program, or media player to prevent most accidental installations of malicious software when using these routine programs.

    Electronics Recycling
    Off topic, but included here for convenience. See the blog posting about Technical Knock Out, a good place for recycling old computers.