rclocher3
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3 answers
10 votes
5k views
Is it legal for a non-profit to use ham radios for emergency purposes?
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19 votes

In the United States, Under the Code of Federal Regulations, Title 47, §97.113 "Prohibited transmissions": (a) No amateur station shall transmit (2) Communications for hire or for material ...

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1 answers
8 votes
1k views
What happens if a station did not submit a contest log?
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11 votes

In general, it is not a bad thing to work stations in a contest and not submit a log. In the big popular contests that don't have difficult exchanges, such as the ARRL DX contest or the CQ WPX ...

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2 answers
11 votes
2k views
How to do APRS in real wilderness?
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11 votes

So you want to broadcast your location using backpack-portable equipment from deep in a narrow valley hundreds of miles from civilization. I'll assume that you would also like the ability to get a ...

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2 answers
4 votes
249 views
Is the 1.5kW power limit per antenna? What about antenna arrays?
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10 votes

Here's 47 CFR § 97.313: § 97.313 Transmitter power standards. (a) An amateur station must use the minimum transmitter power necessary to carry out the desired communications. (b) No station may ...

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2 answers
7 votes
708 views
CW: when I supposed to send "E E"?
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10 votes

First, some history. As I understand it, the "dit-dit" (E E) comes from an old practice. There is a short tune in popular music that was often used to end a musical performance in a humorous way, ...

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2 answers
5 votes
2k views
What are the regulation requirements for running a repeater?
9 votes

WA9ZZZ's answer missed the issue of control of the repeater. The repeater must be under control of one or more control operators, or under automatic control, at all times when the repeater is on. ...

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4 answers
11 votes
2k views
Is "low loss" cable required for HF?
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9 votes

Your question seems as much about psychology as much as technical concerns. We mainly favor the technical questions, but I'll take a stab at the psychological aspects also. All of you, please feel ...

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1 answers
6 votes
17k views
Baofeng UV 9R Handheld programming
9 votes

Almost nobody programs Baofeng and similar radios by hand: too difficult, as you discovered. The thing to do is to get your hands on a programming cable and programming software. If you go to a ...

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4 answers
7 votes
836 views
How would you get an "I'm alive" message to family in another state using amateur radio?
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9 votes

When establishing emergency communications in a disaster, the natural choice of band is one that will allow you to communicate out of the disaster zone. Given the scenario you describe, a massive ...

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4 answers
10 votes
4k views
Single or Dual Paddle Key?
9 votes

Single-lever paddles have a single lever that generates dots when pressed to one side, and dashes when pressed to the other. Dual-lever paddles have two paddles, one of which generates dots and the ...

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2 answers
4 votes
355 views
What is "Meter" referencing in "60-Meter Band"?
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9 votes

That's right, the 5 MHz band has approximately a 60 m wavelength. Back in the early days of radio people often measured where they were on the airwaves by wavelength rather than frequency. Nowadays ...

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1 answers
3 votes
415 views
programming Pofung UV-82
8 votes

Commercially-sold radios that transmit for nearly every purpose other than the amateur service (Part 97) and Industrial, Scientific, and Medical (ISM) equipment (Part 18) in the US must be type-...

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2 answers
6 votes
7k views
What is Hinternet, in simple terms?
8 votes

The Hinternet is the "ham internet". In the US, and likely in other countries also, several WiFi channels fall into the 13cm ham band; being in the ham band is advantageous because licensed hams can ...

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1 answers
3 votes
3k views
Can one send data over Short-wave frequencies?
8 votes

Modern digital systems communicating over HF (aka short-wave) are legal in the US and practical, and in fact one such system is in routine daily use. Have a look at the Winlink system. (The official ...

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1 answers
2 votes
412 views
Detecting the listeners
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7 votes

No, that's not possible. There is no practical way to determine whether the transmitted power is usefully received by an antenna, or just absorbed by the ground. It is possible to detect that a ...

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1 answers
8 votes
3k views
Help understanding path taken by APRS packet
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7 votes

According to the way things work for simple AX.25 packets, the part after ">" is the destination address. However, the APRS specification commonly repurposes fields, with the goal being to keep the ...

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4 answers
5 votes
5k views
What is propagation like when there are no sunspots?
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7 votes

We went through quite an extended sunspot minimum before the current sunspot cycle started, and I well remember what it was like. 10m was open only when there was e-skip, which wasn't very often. ...

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1 answers
2 votes
432 views
What's the proper way to mount antenna mast to the side of a house?
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6 votes

I know that the gap between the wall and the antenna mast that would be created using the wall mounts you mention is not for lightning damage prevention purposes. If a bolt of lightning can travel ...

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1 answers
3 votes
597 views
Recomended coax for 100ft (2m/70cm)
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6 votes

According to this online coax loss calculator, the loss of 50 feet of new Belden 9258 RG-8X with an antenna with an SWR of 1.5 is 4.29 dB at 450 MHz (UHF), so the loss for 100 feet of the same coax ...

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1 answers
4 votes
131 views
Is A7RW a legal call sign?
6 votes

A7RW would be the call sign of a ham in Qatar, rather than the United States. The prefixes AA – AL are allocated to the United States. So AA7RW, AB7RW, AC7RW, etc. up to AL7RW would be valid US call ...

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3 answers
4 votes
248 views
Electromagnetic signal from spark gap
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6 votes

Don't worry, there have been many researchers before you, and you can borrow some of their work. Your English is fine. If you do a web search for "lightning spectrum", you will find a ...

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1 answers
2 votes
125 views
Substitute a car roof with radials?
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6 votes

Don't worry, your question is fine, because what works for a CB antenna works just as well for a 10m antenna. Yes, you could certainly substitute radials for the car roof. The general rule for ...

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1 answers
4 votes
382 views
What are the columns URCALL, RPT1CALL, and RPT2CALL in CHIRP?
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6 votes

"MYCALL", "URCALL", "RPT1CALL", and "RPT2CALL" are used to program D-STAR channels in D-STAR-capable radios. Those columns should be left blank for analog FM channels. MYCALL is your own call sign, ...

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3 answers
7 votes
394 views
How do I send negative numbers or below zero in CW?
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6 votes

According to Wikipedia there is a code for the hyphen or the minus symbol, − · · · · −. However very few hams are likely to recognize it. In the meantime I would suggest sending "MINUS" or "NEG". ...

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1 answers
4 votes
98 views
Steel Directors with Copper DE
6 votes

It's probably OK to use a different metal for the directors than the driven element, as long as you don't have dissimilar metals touching that would create a galvanic corrosion problem. But steel is ...

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1 answers
7 votes
142 views
How long should I wait to claim a frequency?
5 votes

On VHF/UHF, just ask, "This is [your call sign], is this frequency in use?" If you don't hear anything after five seconds or so, go ahead and use the frequency. On HF, things are more ...

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1 answers
1 votes
38 views
How to avoid acoustic feedback while fixing radios?
5 votes

You could use a headset or earphones with the receiving radio, so the received audio goes straight into your ears instead of to the microphone of the transmitting radio. Or you could use an assistant ...

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4 answers
1 votes
2k views
How to increase the bandwidth of half-wave dipole antenna?
5 votes

Marcus and Richard have answered the question that you asked, how to triple the bandwidth of a dipole, with the correct answer that it can't be done. I suggest that you edit your question to give us ...

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4 answers
6 votes
1k views
Any reason not to choose a discone antenna over a Wide/ MultiBand mobile antenna for TX/RX operations
5 votes

The discone antenna that you mention cites "effective" gain of 0 dBd. I don't know what they mean by effective gain, but dBd means decibels compared to a dipole; 0 dBd would mean that the discone has ...

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3 answers
4 votes
3k views
What Frequencies Are Open To People Without A License?
5 votes

Sorry, but you're legally not allowed to transmit on amateur radio frequencies without a license. I'd recommend that you work on earning your ham license. Not only would you be legal, but you would ...

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