webmarc
  • Member for 7 years, 4 months
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  • Loudoun County, VA, USA
Why do people say, "get a nickel," on repeaters?
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31 votes

"Getting a nickel" is a reference to how metered pay phones work (worked?). You'd put in some coins, make your call, and when the time you'd payed for expired, the phone operator would ...

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Why does the audio on my FM transceiver cut out every 5.5 seconds?
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28 votes

It's a feature not a bug. When turned on, the weather alert function checks the local NOAA station for its alert tone every 5 seconds for half a second... doing so takes over the receiver. I'd turned ...

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Hearing Morse code after end of session?
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17 votes

This sounds very much like an aural example of The Tetris Effect (also known as Tetris Syndrome), in which "... people devote so much time and attention to an activity that it begins to pattern ...

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What is the capacitors purpose on a balun?
10 votes

Without having the ability to measure this particular one, I expect that it's to counteract the inductive reactance introduced as a side-effect of the balun design/implementation. Edited to add: check ...

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Why am I not hearing repeater identification more often?
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9 votes

(written assuming you and the repeater are in the USA) Also, repeaters (indeed, any station aside from telemetry) are only required to identify every 10 minutes during communication and at the end of ...

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Will the feds show up to my door? Is there a way to not get in trouble?
8 votes

The good news is that the license you'll need for that particular radio is an amateur radio license which is only a $35 application fee. You will need to pass an exam before you can apply. As far as I'...

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So how do HF nets work, anyways?
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5 votes

You nailed it in your supposition: you hear who you hear. For those with a steerable antenna, they may reposition depending upon who is transmitting to try to hear it all. Compared to a net on the ...

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Increase transmit and receive frequency of handheld transceiver
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5 votes

Yes. You're looking for a transverter that will take RF from one source (your radio) and treat it as if it were an IF stage into another system. Here is an example. Obviously, you'll need to take care ...

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Can ham radio interfere with LTE wireless internet signal?
5 votes

the short answer to #1 is that it is possible but not at all likely for the same reasons Kevin outlines in his answer to the question you linked to, especially the fact that almost no ham radio ...

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How do Radio Regulations and Frequency Allocations Apply to an Ionosonde?
5 votes

Some googling for "ionosonde operation" reveals some applications (for example) to the FCC to operate under 47 C.F.R. §§ 5.3(c) and (e) which details that "Stations operating in the ...

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Is tuning at all useful for an antenna that is already resonant?
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4 votes

This is one of those areas where "words matter" The typical "tuner" may actually accomplish one or more of several functions: matches impedance between two "things", for ...

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EIRP - Conservation of energy
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3 votes

I think what you're asking is: If a radio+antenna system transmits X Watts, then regardless of the configuration of EITHER the transmitting antenna OR the receiving antenna, the power measured at the ...

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Grounding a vertical antenna from a balcony
3 votes

It may be great, it may not... that's definitely an empirical question due to the many factors: how much of the xmit current on the ground leg will be parallel and next to your vertical? this could ...

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I have a 433MHz LoRa Dipole antenna mounted on a rocket. I am looking for a suitable Antenna to receive data from this. Any Suggestions?
3 votes

You could, very quickly and cheaply, experiment with a turnstile antenna. Alternatively, checkout a QFH antenna which are also inexpensive to make, but require a little more skill. And there are ...

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Is a magnetic loop antenna a good option for those in an apartment?
3 votes

Definitely read Hobbs's answer re ins-and-outs of mag loops, spot on... I don't have anything to add on that part. Another option is to make friends with the building super. Depending on his/her ...

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Transmitting Video Underwater
3 votes

SSTV could be an interesting answer here. Bandwidth requirement is about 30 KHz to reach your goal of 1 frame per second AND it's proven tech on HF bands... though you'll need to multiplex the video ...

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How to run chirp with python3-based system (workaround found now)
2 votes

a quick google of "install python 2.7 on Ubuntu Mate 20.04" gives this article as the top result, How to install Python 2.7 on Ubuntu 20.04 LTS Here's an abbreviated list of steps from that ...

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Calculating SWR for a dipole
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2 votes

here is a great answer to a similar question, "how do I calculate the bandwidth of an antenna". Assuming the antenna is in free space, you only need to know the length and diameter of the ...

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Why does beamforming bring more power to the received desired signal?
2 votes

Since the originating signal is not a unidimensional, laser-like effect, but rather an inverse-square-law wave... an enormous percentage of the original signal is neglected by a single element antenna ...

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Why are an antenna’s nulls sharper than its lobes?
2 votes

As @glen_geek points out in his answer, "getting to zero" is pretty definitive. If you'll accept "very narrow lobes" as an acceptable interpretation of "sharp lobes" then ...

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Store and forward system like voicemail for hams
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2 votes

You may like checking out svxlink. I've had success setting it up on a Raspberry Pi, interfaced with a baofeng (pls don't judge) to accomplish VM (as well as successfully interfacing with EchoLink) in ...

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QRN: How to chase down a solid S9 noise floor on 40m only
2 votes

You might consider an RF choke at the interface between your radio and feed line. The choke at the feed point will help prevent common mode current reflecting from the antenna... but the outside of ...

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How effectively do modern transmitters protect against high SWR?
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2 votes

I believe the answer currently is: yes it matters less, but it still matters. Variables include 1) the mode of operation and 2) the speed of the foldback circuit in the radio that provides the trigger ...

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Alinco DR-635 programming software
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2 votes

I can't speak to how it compares to the Alinco software, but I've used the RT software for a few different radios and it's straightforward, if pricey. But $50 for the RT solution is probably cheaper ...

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Is the Boom Strictly Necessary in a Vertical Dipole?
2 votes

You're right, the concern is coupling the feedline with the element. But there's a neat trick: if your bottom element is a tube of large enough diameter to accommodate your coax, you can run the coax ...

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RFI from radials
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2 votes

You might look into a noise cancelling device. The principle of operation on this is to use a second antenna to 1) capture the same noise but phase shifted 180º and 2) mix/add to the primary antenna's ...

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What should I put in a "Go box", "Go bag", or "go kit" for emergency communications?
2 votes

The Amateur Radio Emergency Service (ARES) for example uses the following checklist (source is http://www.arrl.org/files/file/ARES_FR_Manual.pdf): Basic Deployment Equipment Checklist: When ...

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Explain how an antenna works to an 18 year old
2 votes

An antenna is similar to a lightbulb. Lightbulbs spit out photons at a wavelength we can see. These are roughly in the range of 400 to 900 nanometers... a SUPER short wavelength compared to our ...

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Can I ignore the radial elements of a 2m/70cm antenna if it's on a metal roof?
2 votes

You can remove them and instead attach the shield of the transmission line to the actual roof! It will make a great ground-plane, probably much better than the radials that are currently attached. ...

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DIY Triplexer for HF (low), 6m (med), and 2m/440 (high)
1 votes

If you don't mind shifting your DIY attention to a home-brew 6m/10m vertical (perhaps a trap implementation), you might look at a triplexer like this that gives: low pass at <90 MHz for 10/6m mid ...

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