Questions tagged [cw]

Continuous Wave (CW), or Morse code over audible tones. Use this tag for any question relating to Morse code.

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6
votes
2answers
2k views

Configuring an SDR for CW?

So I'm developing my own SDR software from scratch (I like to "own" the code). The channel between the RF-to-USB hardware and the software is 192kHz sample-rate IQ audio samples. The degrees of ...
10
votes
1answer
1k views

Fastest Speed allowed for CW FM repeater ID in USA

What is the fastest legal WPM I can use for my repeater's Morse code identification? I am in the USA.
1
vote
1answer
882 views

Spacing between words in CW using Farnsworth timing?

What is the proper way to calculate or determine the amount of time between words (the key up of the last character of one word to the key down of the first character of the next word) when using ...
3
votes
1answer
618 views

Audio Morse Code to CW converter?

What kind of circuit can be constructed and/or could be used to convert audio containing Morse Code sounds (say from an old practice tape, or from computer generated audio) into key, switch or relay ...
6
votes
2answers
3k views

Preventing CW key clicks

What are "key clicks"? How much does the rise time or bandwidth of a CW signal need to be limited to prevent other QSOs on adjacent frequencies from being annoyed by "key clicks"? Is there a legal ...
3
votes
1answer
155 views

How to tell other party of scheduled QSO that frequency is in use?

It may happen that, at the start of a scheduled CW rag chew, the frequency is in use, but only one side can hear that it is in use. A cannot hear the existing QSO. B can hear the existing QSO. A ...
8
votes
5answers
2k views

Is Morse code a requirement for ham licensing?

As I recall, it used to be in the U.S. that the ability to read and send Morse code over CW was a requirement for an amateur license (and was tested, I believe). Is that still true in the U.S.? If ...
2
votes
3answers
773 views

What is morse code used for in amateur radio? [duplicate]

Ok , so I know very very little about amateur radio, I've hear in some websdr frequencies morse code transmissions and I've got quite curious, what are they? Who sends moresecode transmissions ...
4
votes
1answer
179 views

What is the record for highest successful (automated) CW transmission rate?

I understand high speed CW is used with meteor scatter, because the path only exists for a few seconds after the meteor passes. I was wondering if automated high speed CW has an effective "speed ...
9
votes
1answer
330 views

CW on phone band

In the U.S., regulations permit CW operations throughout the amateur bands. That makes the phone section of a band look tempting when the CW/digital part of the band is busy with a contest. I wonder ...
8
votes
1answer
4k views

Audio frequency used for Morse code in licensing exams?

Back when Morse code proficiency was required for certain radio licenses, what audio frequency was used by the exam tapes, equipment or examiner that generated the Morse code audio? Was there a ...
6
votes
2answers
127 views

Is CW necessary to be competitive in most ARRL contests?

The ARRL hosts many contests throughout the year, and maintains a leaderboard of sorts to encourage competition. Is it possible to rank on any of the leaderboards without knowing or using morse code?
4
votes
1answer
199 views

What would letter T mean in this radio beacon message?

I'm currently picking up signal from a beacon using RTL-SDR and decoding the Morse code on a computer using gMFSK program. The beacon is sending message which decodes as "T DE YU1VHF LOC KN04OO". I ...

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