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Questions tagged [map]

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7
votes
1answer
1k views

What's the difference between “maximum usable” and “critical” frequencies?

In discussing HF ionospheric propagation, you hear about both "critical" and "maximum usable" frequencies. For example: Above the critical frequency, the ionosphere is unable to refract the signal ...
3
votes
3answers
1k views

Convert maidenhead grid square to lat/long in Excel?

I have a list of maidenhead grid squares in an Excel sheet that I want to convert to latitude and longitude. I want to keep it as simple as possible. Does anyone know of a formula to convert from ...
2
votes
2answers
118 views

Contact Logging Software and Geospatial Mapping

Does anyone know of software and/or techniques to effectively and efficiently to: Merge contact logging with displaying location information on a digital map; e.g. Google Earth/Map I would like to ...
13
votes
2answers
12k views

How do I make a RF propagation map for a repeater?

Let's say I have a repeater. Knowing all of the information about antenna height and gain in each direction, as well as power, how can I create a map similar to this map I saw of a repeater in ...
5
votes
1answer
186 views

How to obtain raw data for Global Real Time foF2 Map

Note!!!!: I am not looking for help with how make a map using Google Maps API (that part is done). I need help with finding data. I am building a shortwave radio/HF listening log book online, and it ...
11
votes
2answers
442 views

Is there a KML or similar file that shows all of the CQ Zones?

I'm wanting to view the CQ Zones in Google Earth, and I understand that a KML file will allow me to do so. Is there a place where I can get a KML file that shows all of the CQ Zones?