Most Popular
1500 questions
5
votes
3 answers
Does an End-Fed Antenna need to be straight?
Typical yard and wondering if I can go out a window, to a tree, turn to another tree, turn to another tree simply trying to achieve the length required for 80m band? One video stated it doesn't need to be straight, but need to verify.
Mot
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5
votes
4 answers
Repeater Amplifiers DMR vs Analog
I have recently purchased an amplifier for my repeater. This was actually my first amplifier purchase ever and should probably have asked more questions prior to buying it. The repeater is a Motorola XPR8400 UHF R1 running in dynamic mixed mode. …
Mike
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5
votes
1 answer
How do I get QSL cards from the Incoming Bureau?
I'm new to QSLing and want to know how to get QSL cards from an incoming bureau in the USA. I have sent outgoing cards recently and want to know how to acquire the replies. Could somebody describe the process?
AI7OW
AI7OW
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5
votes
1 answer
Hearing impairment and CW?
Do there currently exist profoundly deaf operators who operate CW? If so, how does one operate without being able to hear a sidetone?
If licensed in the U.S. before 2006, how did they pass the Morse Code portion of the license exam?
hotpaw2
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5
votes
3 answers
Why don't J-Poles need to be grounded?
I'm building my first J-Pole and the different projects and articles I read about differ slightly but one commonility is a J-Pole does not need to be grounded. Why is that?
I read that it is optional to ground the J-Pole antenna to deal against…
john_ham_radio
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5
votes
1 answer
What is a general procedure for aligning directional antennas?
I want to establish a microwave link (1.2GHz) between two stations using antennas with a directional radiation pattern. The stations have a clear line of sight to each other. Each antenna is attached to a half-duplex transceiver operating at…
mtrberzi
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5
votes
1 answer
Can unlicensed users operate at a Canadian club station?
I am a radio amateur licenced in Canada and a member of a local club station. At a recent meeting, someone asked me whether they could operate at the station if they did not have a radio licence. I am aware that, in general, an unlicenced individual…
mtrberzi
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5
votes
1 answer
Why does my received power rise so much when I connect an antenna?
I am in early stages of making a narrow-band radio receiver (block diagram below). To give you an idea, I am using a simple CP-FSK based modulation scheme, and have achieved 5dB SNR with a Tx signal of -118 dBm on wires (feeding signal via an R&S…
Kraken
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5
votes
1 answer
What is this vertical antenna with radials pointing up
I work next to "Koninklijk Marine Kadettenkorps Afdeling Oostende" (Royal Marine Cadet Corps Ostend). They have an antenna that I've been wondering about for years now:
It is a vertical antenna, likely HF bands with four radials angled about 45…
Dieter Vansteenwegen
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5
votes
6 answers
How does single sideband work theoretically?
How does single-sideband (SSB) work theoretically? If a theoretical SSB transceiver is a "black box" and only its inputs and outputs can be analyzed, not the way it works internally, what is happening?
kj7rrv
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5
votes
1 answer
Why did the International Telecommunications Union denote CY for Canada?
CGP Grey recently released a video on the history of airport acronyms, e.g., LAX. He briefly said that you may wonder why codes for Canada started with Y and formerly CY, and that it traced its history to the telegram “but that’s a story for another…
Ethan Miller
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5
votes
2 answers
How can AM radio work differently when approaching the true frequency from different directions?
I bought a very cheap world band receiver, Nedis RDWR1000GY. It has MW, SW and FM reception. MW is useless where I live (no MW stations nearby and signals don't propagate far), but I was primarily interested in the SW and FM reception. The FM…
juhist
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5
votes
5 answers
Is FM effectively spread spectrum?
My understanding is that FM achieves better audio quality (under the right circumstances) than AM by spreading the narrow audio signal's information into a wider RF signal. Does this mean FM is technically a form of spread spectrum?
Someone
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5
votes
2 answers
When to use TSQL vs TONE for a (2m) repeater?
I'm trying to understand when to use TSQL and when to use TONE in the configuration of a repeater. I got a repeater file to import into my radio from http://www.dstarinfo.com/repeater-list.aspx and in the file some repeaters use TSQL and some use…
Pablo Fernandez
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5
votes
4 answers
UHF 70cm unlicensed use
We are farmers with (edit) 25-40w radios mostly old Kenwoods and Motorolas in all of our tractors and vehicles. I'm not exactly sure what frequency we have but the man who programmed them set them up with 2 preset channels. We are not licensed hams.…
Logan
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