WA8LMF Home Page | Main Ham Radio Page | Updated 17 march 2017   

Click on the buttons below to go to the various
WA8LMF  APRS mapping webservers.

 30 Meters HF    2 Meters VHF    ISS Satgate 

 

 Special Events Webserver
(Typically used for balloon launches, hamfests, etc. Not always up.)

 IARU Beacons Monitor
(Real-Time Monitoring of the 20, 17, 15, 12
and 10-meter IARU HF Propagation Beacons.)
 

 TW700 Tablet uServer for 60M Tests

 

NOTE 1:  The pages linked above are on a server hosted on a PC connected to a consumer cable modem account with a 1.5MB/sec upload speed. Due to limited bandwidth of this connection, images may occasionally fail to load if I have other large bandwidth-sucking uploads in progress. If one or more of the maps fail to appear, hit "Refresh" or "Reload" on your browser toolbar.

NOTE 2:  Disable automatic image resizing in your browser. The maps sent by this server are likely to be much larger than your browser window. The automatic downsizing for large images provided in some browsers will make the thin lines and small details on the maps an illegible blur if not turned off. With resizing turned off, you will have to scroll down and/or to the right to see all of the maps.

NOTE 3:  This webserver is using  TCP/IP ports14439, 14441, & 14443  rather than the customary port 80 for http .   As a result, you may not be able to access it from some corporate or government Internet connections that severely firewall or otherwise restrict access to uncommon port numbers.

NOTE 4: Propagation on 30 meters HF is highly sensitive to the level of solar activity.  When the solar X-ray flux plotted on the graph below has a baseline above the first major division, or spikes upward (i.e. a solar flare), 30 meters will have very poor conditions, or black out completely, causing very few (or no stations at all) to show on the HF map.

X-ray radiation from the sun travels at the speed of light, reaching the earth in about 8 minutes.   When these intense blasts of X-rays reach the earth, they can temporarily disrupt the ionized layers of the earth's upper atmosphere (the ionosphere). These layers are responsible for reflecting long-range (beyond the horizon) HF radio signals back to earth.  The result is a weakening or even complete fade-out of HF radio signals.


Real-Time Solar Activity Monitor (Last 72 Hours)
Graph from NOAA website of solar X-Ray flux.
(Courtesy of US National Oceanic & Atmospheric Administration
 at http://services.swpc.noaa.gov/images/goes-xray-flux.gif )


More solar activity information.
The changing values on this display are, again, due to the
ever-changing flow of energy and charged particles from the sun.

Courtesy of Paul L Herrman  N0NBH  http://www.hamqsl.com/solar.html


Background on the WA8LMF Webserver Setup

The WA8LMF APRS webserver produces multiple map displays.

These displays are served by the UI-Webserver component of three copies of UI-View32 running simultaneously on the same computer. The VHF and ISS "Satgate" instances are running in two separate VMware virtual machines using micro-Server2003. The HF page is running directly on the Win7 host. All instances are connected to APRS Internet servers using filter ports set to receive JUST my own callsign, the ISS space station object, and the US National Weather Service feed.   All stations heard off-the-air in all three instances are passed to the APRS Internet System; i.e. all three instances function as igates.

All instances of UIview are set to capture and date-time-stamp an image of their map automatically every 2 minutes.

All of this, along with EchoLink, mmSSTV and EasyPal "digital" SSTV is running on an Acer 756 "netbook" PC dedicated to 24/7 "Ham SuperServer" duty.  (Review here)