WA8LMF Home Page | Main Ham Radio Page | Updated 31 March 2015   

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

 30 Meters HF    2 Meters VHF    ISS Satgate 

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

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.   The flare may also be accompanied by a blast of charged particles traveling far more slowly that reaches the earth in one or two days. The result is that there can be two fadeouts associated with one event, one within minutes and then a second one a day or two later. The only positive associated with these events is that people outside the Arctic or Antarctic regions of the world have a much better chance of seeing an aurora.

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.

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)