13 votes
Accepted

Non-traceable radio emitters

IMO, your question is too general to give a good, specific answer. Also, it would help if you elucidated the motivation for the question. I am a semi-retired electrical engineer, not a security or RF ...
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11 votes

Non-traceable radio emitters

Another possibility to look into is meteor burst communication. This is a well-established technology. You beam a VHF signal up into the sky, it bounces off a meteor trail, and your recipient picks up ...
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8 votes

Can a FM tuner (receiver) be detected and triangulated?

The story is about Eric LeMarque who got lost after snowboarding out of bounds in the Sierra Nevada mountains. Radio receivers usually contain some kind of oscillator. Detecting the unintentional ...
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7 votes

How can one convert from Lat/Long to Grid Square?

My first post in SO. Here's a C version... made this for an Arduino project. ...
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5 votes

Non-traceable radio emitters

at least in the world where I come from Assuming this is the world of arrogant computer security experts (sorry I'm a bit allergic to this): Well, unlike computers, physics wasn't designed by humans. ...
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5 votes

How can one convert from Lat/Long to Grid Square?

This helped me. For anyone that needs it, here is a port to Java: ...
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4 votes
Accepted

Can a FM tuner (receiver) be detected and triangulated?

Is this [detection of a receiver through its amplification of received signals] possible in practice? Aaaah, no. Not exactly like described in that thread. In more general terms, yes, it is. So, ...
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3 votes

Is there a public standard for 8 and 10 character grid locators?

The Maidenhead locator system (which you correctly tagged) is described in detail in this Wikipedia page. A short summary from that page is: To summarise: Character pairs encode longitude ...
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  • 4,409
3 votes

How can one convert from Grid Square to Lat/Long?

if by "Grid" you mean "Maidenhead Locator" then here is a similar question, with some sample Python code as answer. The result from the code will be ...
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3 votes
Accepted

How Are US Call Sign Location ID's Assigned?

When you fill out the paperwork at the time of taking the test you specify your permanent home address for your license. Thus, if you take the test in California but use a NY address then you will be ...
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  • 2,868
3 votes

How can one convert from Lat/Long to Grid Square?

I've included Locator based calculations in PyHamTools - an open source python Library, which is easy to use: It's as easy as this: ...
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  • 131
2 votes

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

Yes, there is now. This is probably what you want. https://g7vjr.org/2019/08/google-earth-kmz-files-for-cq-zones-and-itu-zones/
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2 votes
Accepted

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

There is not any such listing, as the definitions for CQ zones are a bit ambiguous. The official definitions can be found at the CQ Magazine WAZ award definition. Areas like the ocean aren't covered, ...
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2 votes

Where can I find the official definition of ITU Zones?

Here. This is, I expect, what you want. https://g7vjr.org/2019/08/google-earth-kmz-files-for-cq-zones-and-itu-zones/
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2 votes

Is there a public standard for 8 and 10 character grid locators?

The Maidenhead system breaks down a grid into increasingly smaller chunks. The fourth pair is defined as an evenly spaced 100 square grid, or 10x10. This site has an excellent image that breaks that ...
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  • 727
2 votes

How can one convert from Lat/Long to Grid Square?

I didn't see any answers that had the extended square as referenced in the Wikipedia article. My Clojure implementation (GitHub Gist Here) encodes the fourth and fifth pairs. ...
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2 votes

What are the qualities of a good field day site?

(Posted as an answer instead of a comment due to size) In short, the current question ("What are the qualities of a good field day site? ") is unanswerable because: Objectively, it depends ...
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  • 2,855
1 vote

Non-traceable radio emitters

I remember an episode of the live action TMNT series in which Mike had a pirate radio station. To make detection harder, the transmitter was in his truck. I believe everyone here has been thinking ...
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1 vote

Non-traceable radio emitters

There are several techniques. first physically hide the transmitter and antenna. While this is hard for large antennas, it becomes more feasible at higher frequencies. I read a story about a HAM radio ...
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1 vote

Is there a public standard for 8 and 10 character grid locators?

A recommendation for a formal definition of the 10 character system is available in the IARU-R1 VHF Handbook. Here's the relevant quote: 3.7 Proposals to Clarify and Standardise the IARU Locator, ...
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  • 2,715
1 vote

Mobile Phone offline maindenhead or mgrs web app

I do a lot of off-network travel and one thing I found out is that you can cache Google Maps as described on this link. Then your Google Maps app will keep running as long as you have GPS (and if you ...
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1 vote

How can one convert from Grid Square to Lat/Long?

There is a Python package converting to/from Maidenhead/WGS84 Lat/Lon
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  • 89
1 vote

How can one convert from Lat/Long to Grid Square?

C# version ...
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1 vote

How can one convert from Lat/Long to Grid Square?

Here's the docs on it. http://www.qrz.ru/vhf/qth_h.pdf And of course you were given this one. https://en.wikipedia.org/wiki/Maidenhead_Locator_System Take a look at http://aprs.fi/ http://aprs.fi/...
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1 vote

How can one convert from Lat/Long to Grid Square?

The solutions I've seen all seem to be rehashing the same code with little thought to what is actually happening. I decided to write a solution that solves the general case, making it a simple matter ...
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  • 111
1 vote

How can one convert from Lat/Long to Grid Square?

Have a Look at numpy.meshgrid http://docs.scipy.org/doc/numpy-1.10.0/reference/generated/numpy.meshgrid.html
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  • 21

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