Frequently asked questions about DXMAPS.COM propagation maps

Q) Maps are not shown / Maps are not updating automatically. What can I do?

A) First of all, make sure that Javascript is enabled for DXMAPS.COM in your browser.  Second, check the configuration of your Internet explorer and clear the cache (Internet temporary files)

Q) Why some callsigns are shown in different colours (blue, green, black....)?

A) The colour of the callsigns indicates the source of the information for a given report:

Additionally you will see some callsigns remarked on a yellow background (like XX0XX).  These are the DXMAPS supporter users. This is, users who are contributing to keep the server running.

Q) I'm not interested in WSPR, RB and APRS spots. How to do it to view only human made reports?
Q) I'm not interested in FM-SWL spots. How to do it to view only amateur radio reports?

A) Simply tick the "Only DXC" option at the top-right corner of the maps
 
    

Q) Can I see a listing of the contacts, instead of a map?

A) Yes. Simply select the "List" tab at the top-left corner of the maps.  You can also select "Graph" to get a band-scope view.
 
    

Q) Why the DX-spots I sent from DXMAPS are not shown?

A) That could be done for a good number of reasons. First of all you have to understand that when you send a DX-Spot from DXMAPS pages, it is not directly incorporated to the database, but sent to the DX-Cluster network.  When that spot is received back from DX-Cluster, as all spots from other stations, is analyzed by a sophisticated routine that filters out spots that apparently are not real spots.  You would be amazed to know that more than 25% of spots flowing thought the DX-Cluster are not reporting a QSO, but are the result of misusing the network to cheer each other, ask questions, complain about something, etc.   There are also many spots which frequency is clearly wrong, or that the spotted grid square is outside the boundaries of the country of the reported station, etc.

Some basic rules to make sure your spots are not filtered out:

  1. Don't write useless comments.  Texts like "Hello" or "Please" for instance will possibly lead your spot to be filtered out as it will no be considered the report of a QSO.
  2. Make sure that your grid square/locator is correct in the callbook
  3. Make sure that the reported data (callsign, frequency, grid square, etc.) are all correct.

Q) Is there an historical record of the maps and QSO?

A) Yes. You can query the database and and also look at former 2m animated sporadic-E maps.

Q) When I put a comment it shows both locators then my comment. How do I eliminate the locators from my comments?

A) Locators are the most important information you can add when sending a spot, as it shows the exact location of the stations, and allow DXMAPS to make the calculations. I don't understand any reason why you would like to eliminate the locators, but if that is really so important for you and you want to take the risk that your spot could be filtered out you can always send an unformatted spot.

Q) The service is free, but how is it funded?  Can I make a donation to contribute keeping the service up and being improved in the future?

A) Yes, the service is free and it will continue being free. However it requires hiring a powerful server with an approximate cost of US $250 per month.  This cost is covered thanks to the donations of supporter users and to the advertising.  If you like the service please consider some kind of donation.

Q)  What are the little red dots that I sometimes see on the lines?

A) They mark the estimated ground reflection points in multi-hop sporadic-E paths. They are only an estimate based on the geometry and as such should be interpreted.

Q)  What is the blue line that appears across the world maps?

A) It is the geomagnetic equator. An interesting reference for north-south and TEP propagation.

Q) How can I post FM DX spots?

A) Please use FMLIST to report the received FM station on-line. As soon as you spot it there it will be also shown in DXMAPS maps.

Alternatively you can also use DXMAPS form to spot FM stations, but in that case you will have to indicate the Locator of the spotted station, so that the system can locate it.

Q)  Can I post VOR spots?

A) Yes, simply use the format VOR/xxx (being xxx the callsign of the VOR).  If you don't know the Locator of the VOR leave that box blank and the system will try to take it from the VOR database. This is an example of how to spot VOR CDP (Capdepera) on 112.900 MHz.

Q)  I have an AIS receiving station. Can I post AIS spots?

A) Yes, simply download the AIS DX Aggregator program that will automatically upload AIS DX spots to DXMAPS.

Q)  I have an APRS station. Can I report the DX reception of APRS stations?

A) Yes, simply download the APRS DX Aggregator program that will automatically upload APRS DX spots to DXMAPS.

Q)  Is there some tutorial on how to use DXMAPS?

A) There is a good, although unofficial video on Youtube

 

 

 
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2 user comments


#2 - jim - 08/05/2013 - 14:41
I run DXMAPS on two seperate computers. on one , if I click on a fillin space (like "Freq", it will show a popup with previous freqs for me to select by clicking on it.
on the other computer this auto fill doesn't happen and I have to manually insert any info into the box. is this normal? both are running Ver 2.4 ND6M

#1 - jim - 08/05/2013 - 14:40
I run DXMAPS on two seperate computers. on one , if I click on a fillin space (like "Freq", it will show a popup with previous freqs for me to select by clicking on it.
on the other computer this auto fill doesn't happen and I have to manually insert any info into the box. is this normal? both are running Ver 2.4 ND6M

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