Amateur Radio Stack Exchange
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1500 questions
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3 answers

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

Can someone explain how can get the Lat/Lon of a given Grid square? (the middle of the grid would be the best). I've looked at this (that does the "reverse"...from lat/lo to grid"): How can one convert from Lat/Long to Grid Square? But i need to do…
Michele MichelinoK Costantino
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3 answers

Is there a preferred order for learning Morse code using the Koch method?

The Koch method of learning Morse code is based on the idea that you learn characters at full speed, but a reduced set of characters that is expanded over time, instead of learning the full set of characters from the beginning at reduced speed and…
user
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How to calculate effective isotropic radiated power apply to lossy antennas

If a band allows one watt EIRP and I have an antenna that is 1% effective could I legally run 100 watts into the antenna because only one watt is radiated? If that same antenna also has a gain would I then have to include this as well in the…
Arthur
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4 answers

CW "training" recordings

I'd like to get some recordings of typical receiver audio output of HF CW transmissions. I'd like to both train my mental copying capabilities and look into improved automatic (software) CW transcribers; hence, typical, humanly induced symbol rate…
Marcus Müller
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1 answer

ADS-B for Trains?

Is there any kind of technology similar to ADS-B for trains? I'm aware of HOT/EOT/DPU messages, but as far as I can see these don't allow you to see its location. I'm specifically wondering about the location aspect. Would be particularly nice if I…
lightbord
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How can we determine what repeaters to use?

My wife and I are studying for our Technician class licenses. We are thinking about how we could communicate with each other while both of us are at work, she being in Oakland, CA and myself in Pleasant Hill, CA. with several hills and about 15 to…
Jonathan
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2 answers

How Are US Call Sign Location ID's Assigned?

If I take my license exam in California, but my residence is in New York, would my call sign still reflect the New York location?
user7822
4
votes
2 answers

How do I evaluate the features and performance of radios?

A recent phenomena in amateur radio has been the influx of inexpensive handheld 2m/70cm radios from companies such as Baofeng. These claim to have the primary features like power output and frequency coverage that many other brands with a fraction…
W5VO
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What factors (out of operator control) can affect the range?

Some factors, such as the antenna type and power output can be easily adjusted by an operator to manipulate the range of a radio signal. However, others (such as the weather) are out of operator control. What such factors can affect the range of a…
berry120
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7 answers

How do I separate dovetailed PowerPole housings?

Anderson PowerPole connector housings can be joined side-to-side using dovetail joints molded into the plastic to make a multi-conductor connector, as seen in the conventional amateur radio 12V power positive/negative configuration. How does one…
Kevin Reid AG6YO
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3 answers

Receive directionality of a sub-optimal Yagi

How do I build the best antenna for a given VHF frequency given that an optimal design is too large? I am trying to understand the properties of a directional antenna of sub-optimal design. All the discussions of directional antennas assume…
dwitten
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4
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How to bypass LNA for TX in UHF Antenna?

I want to work with amateur, low power, and/or pico satellites. I would like to use an Eggbeater or Turnstile antenna with my UHF 433 MHz radio, since those antennas are very cheap and easy to build and I don't have to care about yagi rotors. The…
vz0
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4
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3 answers

Bridging LAN over ~1-2km distance

A friend of mine and I live across a lake from each other, and recently we thought it'd be fun to try and connect our computers together somehow across that distance. Running cable from either side is expensive, difficult (no boat), and probably…
haze
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4
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2 answers

Experiences on a 70 cm band shared with radiolocation service

I currently live in Brazil and our governmental regulatory agency (www.anatel.gov.br) has recently started a public consultation process regarding the allocation, in secondary nature, of part of the 70 cm band to the radiolocation service. Some of…
Rodrigo Magalhães
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1 answer

What does the APRS 'to'/destination address mean?

I'm looking at incoming packets. Here's the beginning of a few messages: KF7WXW-9>TU3RTW,WIDE1-1,WIDE2-1:`2D<.. KX5ONE-9>T5SRPV,WIDE1-1,WIDE2-1:`2E0.. KX5ONE-9>T5SRSV,WIDE1-1,WIDE2-1:`2E .. So, what to the Txxxxx labels mean? The APRS spec talks…
tedder42
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