Amateur Radio Stack Exchange
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1500 questions
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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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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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Can one send data over Short-wave frequencies?

I have an inkling of an idea- a modem system communicating over Short-wave. I know that WiMAX already exists, but the difference is that, while WiMAX works on the Gigahertz frequencies, and most concepts for Ham Radio ones think Megahertz…
Rory Yammomoto
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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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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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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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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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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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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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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…
300D7309EF17
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What is "Meter" referencing in "60-Meter Band"?

I know that there are various bands referenced in meters (or cm). My question refers to what exactly the word "meter" is referring to when identifying the 5MHz band? I know that the 60-meter band is 5MHz, and considering that communications on that…
RedDogAlpha
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3 answers

Recommended 9:1 unun core type(s)

I would like to construct a 9:1 unun that connects my QRP transceiver to a random-wire antenna. The transceiver's antenna connection is an unbalanced BNC jack and the random-wire antenna is, well, a random wire. ;) I have several toroidal ferrite…
Will B - AF7EC
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What should be in a one hour class about Radios in Boy Scouts

I have been tasked with teaching a one hour class to adults who lead Boy Scout troops about "Radios in Scouting". What should I teach them? Possible subjects include: Teaching the Radio Merit Badge Operating a Jamboree on the Air Use of radios on…
RobSartin
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What is the proper spacing away from a rare RTTY station?

How far away should I transmit from a rare DX station in RTTY? RTTY itself doesn't take that much bandwidth, but I've heard that I should be spaced 2-3 kHz away. Is that true? Thanks!
PearsonArtPhoto
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