tag:blogger.com,1999:blog-66402483481229146972024-02-06T22:57:41.378-06:00WA5MLFJohn Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.comBlogger109125tag:blogger.com,1999:blog-6640248348122914697.post-37808332984093118202019-08-10T16:48:00.000-05:002019-08-10T16:54:32.773-05:00Adobe Flash blocked in Chrome 76When 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 John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-35776432328365744362019-01-31T22:22:00.000-06:002019-01-31T22:24:04.030-06:00Propagation Maps for 7 MHzUsing the VOACAP online program, I collected color-coded maps representing the predicted signal power (dB relative to 1 watt) centered on a designated transmitter site. In the program this map is obtained from the SDBW button at the lower right corner of the main page.
I used the grid square location for W4UOA as the transmitter site and specified SSB mode, 500 W power and antenna at 33 ftJohn Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-44990122675300262302019-01-25T06:26:00.000-06:002019-01-25T22:30:20.527-06:00AM broadcast received audio -- local and remoteAudio quality testing this morning involved reception of WWL-AM (870 kHz) on my Flex-3000 transceiver. I recorded audio samples from two places:
Flex-3000 speaker output
RCForb client program output
Below is a drawing that shows the arrangement of radio and computer software, and the software components that are involved in the two audio paths that I used for recording. I also showed the John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-88089924143903861232019-01-24T14:54:00.000-06:002019-01-25T22:31:54.709-06:00Graphs of Maximum Usable Frequency from Ionosonde DataIn support of a forthcoming article on 40 m propagation during the daily East Coast RV Service Net, data has been collected for two ionosonde sites: one at Eglin AFB in Florida and one at Wallops Island in Virginia. The locations of ionosondes around the world can be seen at this web page.
Thanks to Dan KC4GO for collecting data on
critical frequency (foF2)
MD = MUF(3000) / foF2
MaximumJohn Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-3341489980766910402018-09-19T16:39:00.001-05:002018-09-19T16:39:46.005-05:00Hidden Damage to 450-ohm Balanced LineRecently I installed new coax cable from my rig to the outdoor surge protector on the back of my garage, where the balanced feed line terminates from my multi-band dipole. This is the latest evolution of the dipole from its initial design based on pages 7 - 10 of the article Choosing the Correct Balun. The current configuration has adopted some characteristics of a G5RV design.
While John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-12455490889891341832018-08-13T06:39:00.000-05:002018-08-13T06:39:08.258-05:00Lightning - Sunday nightHere's a screen shot of the real time display from LightningMaps.org during a 15-minute period last night. The yellow and orange dots are the lightning detections. The blue dot is my home location.
My rain gauge collected 1.3" last night.
John
John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-3804697184326290752018-08-06T11:45:00.002-05:002018-08-06T11:48:46.858-05:00Joining Google Hangout from shared linkHere 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 John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-45166401939136140522018-05-03T09:57:00.004-05:002018-05-03T10:03:06.808-05:00Email addressee "auto-complete" entries
I and several friends have noticed the annoying behavior of some email applications to pull up multiple email addresses for a friend when entering part of a name or partial email ID in the To: field of a new email. With a careful search I found the following two (of many articles) that address the issue:
How to Clean Up Your Gmail Autocomplete List
I searched through my Google contacts John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-71593358519938843322018-03-20T14:36:00.001-05:002018-03-20T14:54:22.754-05:00Customizing arrangement of RCForb windowsBased 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.
(John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-58812518976283965282017-12-09T11:20:00.004-06:002018-01-12T22:09:35.362-06:00Cryptocurrency and BlockchainHere are some informative links about cryptocurrency (Bitcoin is the first and best-known) and the enabling Blockchain technology.
Cryptocurrency
The introduction and Overview in this article provide a good quick view of the topic, including the concept of a production cap that limits the ultimate amount of the currency in circulation.
Cryptocurrency Mining
In the early years of Bitcoin, John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-33028978448348741342017-10-31T10:57:00.001-05:002017-10-31T10:57:16.508-05:00Test of blog post from outside emailTest of blog post from outside email. Sent by John on 10/31/17.John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-64059824470531647832017-10-31T06:57:00.001-05:002017-10-31T06:57:12.643-05:00Test of email post to blog Test of posting to blog via email. 10/31/17 John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-58061412536512001172017-09-28T11:59:00.000-05:002017-09-28T13:39:48.890-05:00WiFi Analyzer AppsHere 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
John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-72797522700952487502017-08-24T07:26:00.000-05:002017-08-24T07:33:46.474-05:00VOACAP 7191 kHz - Aug 24 at 0715
Best signal would be indicated by green and blue contour lines, but they are missing today. Not the best conditions.
John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-24831586122134996432017-06-01T16:59:00.001-05:002017-06-01T17:38:27.479-05:00HF Radio Propagation ModelingBelow 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 John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-29643622526006132172017-04-24T06:58:00.000-05:002017-04-24T06:58:45.991-05:00BRARC-80thJohn Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-13223310510353014392017-04-22T17:14:00.002-05:002017-04-22T17:21:38.777-05:00160 m Dipole - Old and NewHere is a series of plots that compare the radiation patterns of two versions of multi-band dipole antennas at KB0BH:
Old dipole: 240 ft end-to-end, 35 ft high, 450-ohm balanced line feed
New dipole: 230 ft end-to-end, 60 ft high, 450-ohm balanced line feed
Modeling for the old dipole includes the fact that 20 ft on each end hangs down vertically.
The graphics below include horizontally John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-55757052555183177542017-03-13T15:10:00.000-05:002017-03-17T13:40:42.835-05:00Map of QSO participantsI updated a pair of Google Earth map views to show the locations of participants in our morning round table QSOs on 75 m. These are extensions of the earlier maps I made a few years ago of participants in the Saturday Bell Ringers Net. Click on either graphic below for a full-size view. The place marker dot, not the call sign label, represents the location of each station.
The view above John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-88126444961613643752017-03-06T21:45:00.000-06:002017-03-16T13:44:12.117-05:00Baluns -- Under the HoodBelow are views of 3 baluns that I own, with their covers removed to see the internals. The first photo shows 2 LDG baluns that are rated for 200 W. The one on the left is a 1:1 current or choke-type balun. The one on the right is a 4:1 balun that appears to be a voltage-type balun. For some in-depth discussion of balun types, see this article by W7EL.
LDG baluns
1:1 John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-75762355837507773872017-03-06T21:01:00.001-06:002017-03-06T21:01:38.125-06:00Comparing 3 Feed Line LengthsI added another 3 ft of 450-ohm ladder line to my antenna feed line, bringing the total length of ladder line to about 99 ft. Using data measured by my antenna analyzer, I compared the current data with what I collected with the previous lengths of 91 and 96 ft. Below are graphs that compare the SWR and impedance (magnitude) for the 80 m and 40 m bands.
SWR 80 m
SWR 40 m
John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-65706087577121371572017-03-05T14:36:00.000-06:002017-03-05T14:36:25.597-06:00Bringing Gamma Back -- Alzheimer's Research
A December 2016 NPR Radiolab podcast reported on research using mice that discovered
the beneficial effects of blue light flashing at the brain's gamma wave
frequency, reversing Alzheimer's effects, at least temporarily. The
audio program runs for almost 25 minutes and has a few promotional
announcements (commercials).
Below the web page graphic are some
recommended links for additional John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-22098613804496477872017-03-03T16:22:00.000-06:002017-03-03T16:27:50.357-06:00230 ft Multi-band DipoleThis posting provides a collection of antenna model graphs for a multi-band dipole with the following specs:
230 ft end-to-end horizontal
60 ft above ground
75 ft of 450-ohm balanced feeder
Model results are provided for the following bands: 160, 80, 60 and 40 m. For each band the graphs are:
SWR at the transmitter end of the feed line
Impedance data (R, X, |Z|, phase) at the transmitter end John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-18009386211045903742017-02-24T20:09:00.002-06:002017-02-24T20:14:00.092-06:00Multi-band Dipole -- ladder line 96 ft vs 91 ftFollowing another suggestion for tweaking my dipole, I added 5 ft to the 91 ft 450-ohm ladder line and used my antenna analyzer to compare the results with what I obtained previously. The two graphs below compare what the auto-tuner was able to achieve on selected frequencies on the 80 m and 40 m bands. SWR readings are what my transceiver reported after the tuner had reached its best match. John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-43368513779639692072017-02-19T22:45:00.000-06:002017-02-20T10:07:25.482-06:00Multi-band Dipole - version 2This posting continues my exploration of the performance of my multi-band dipole as reported earlier. Based on suggestions from KE4ID, I revised my antenna to the following specs:
102 ft total length of horizontal portion (previously 110 ft)
91 ft of 450-ohm ladder line (previously 84 ft)
DX Engineering 1:1 balun (also tested with LDG 1:1 balun on 80 m band)
12 ft of 50-ohm coax to the antenna John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0tag:blogger.com,1999:blog-6640248348122914697.post-89123273614346227782017-02-17T22:35:00.000-06:002017-02-17T22:36:34.631-06:00Multi-band Dipole SWR on 75 mAs part of my continuing effort to get acceptable performance of the W8JI-style multi-band dipole (described in this article), I'm working with the original suggested 110 ft dipole length to cover 80 - 10 m. My current feed line has:
84 ft of 450-ohm ladder line
a 1:1 choke balun
12 ft of 50-ohm coax cable to the tuner (I may shorten this)
When operating on 3.74 MHz, I find that the antenna John Krupskyhttp://www.blogger.com/profile/09847430779861356747noreply@blogger.com0