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
1answer
678 views

Coherent CW synchronization?

When using coherent CW, how is the receiver frequency and/or Morse Code dot clock synchronized to the transmission precisely enough to allow for synchronous decoding?
3
votes
1answer
3k views

Yaesu FT-450D CW from computer - DATA and CAT connectors

Yaesu FT-450D Transceiver USB-to-DB9 cable installed to the CAT interface Computer runs the ADMS-450 channel-programming program fine. Computer can run the PCC remote-control program fine. DATA ...
9
votes
3answers
1k views

What is the origin, history behind “Ben's Best Bent Wire”?

Bens Best Bent Wire My uncle, who was a Merchant Marine in WWII used to tell me this. He was a ham, and said it would develop my fist musically. I was a small child at the time, and through his ...
6
votes
2answers
4k views

Morse Code meta-command sequences?

When using Morse Code as an accessibility/disability communication or input method, are there any non-alphanumeric dot-dash sequences that are more common or more suitable for meta-commands, such as “...
18
votes
6answers
23k views

Using a Morse code key with a computer?

Are there standard ways to connect a hand key (straight or paddle) to a contemporary computing device (PC laptop with no parallel port, Mac, Android, iOS device, etc.) for developing or improving ones ...
9
votes
2answers
2k views

Is Morse code allowed on FM in the USA

Let's say I get my little 2 meter FM handheld out and make a little sine-wave generator with which I pulse a morse code and if I connect it to headphones a speaker, I hear the dits and dahs of a nice ...
9
votes
3answers
8k views

Bandwidth of a CW signal?

What is the RF bandwidth of a typical CW signal? How is the signal bandwidth affected by WPM and/or transmitter rise-time? What is the narrowest bandwidth that can still be copied by a human? Or ...
14
votes
6answers
1k views

Where can one find recordings of Morse code, generated by humans and not machines?

I need some recordings of CW / Morse code for use in a project. Most of what I find is either nonsense (it just exists for the 'sound of CW', but doesn't contain a message) or is generated by a ...
15
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2answers
2k views

How does selecting the opposite sideband when receiving CW on HF reduce interference?

I am studying for my FCC General Class license, and question/answer G4A02 reads as follows: Q: What is one advantage of selecting the opposite or "reverse" ...
1
vote
1answer
239 views

Morse code in a puzzle

I'm working on a morse code geocache puzzle. Firstly I had to listen to Morse code and I got the following words from it SYGYO UMPET KUSIK MUMWY MOPPE MACOP TUGNY WAAXT MUFAJ MIAMG TUGND I suspect ...
11
votes
6answers
491 views

Key CW on zero crossings - zero bandwidth?

I remember being surprised to learn that a CW signal has a bandwidth (albeit small), but when I thought it over, it made sense. Essentially, we are modulating the carrier with a low frequency square ...
7
votes
2answers
301 views

Are there any rules/conventions for transmitting coordinates in CW?

I am wondering how hams transmit coordinates in Morse code. Considering that coordinates can be represented in many different formats (such as DD, DDM, DMS, WGS84, etc.) and that an error in the ...
6
votes
3answers
325 views

How do I send negative numbers or below zero in CW?

Sometimes when operating CW I want to send numbers that are negative. In particular when operating outdoors during the winter and someone asks the temperature, I would like to come back in CW with -...
1
vote
1answer
89 views

“;” in morse “-.-.-” or “-.-.-.”? [duplicate]

What is the correct sign for ";" in morse? FLdigi converts "-.-.-." to ";" whereas in various code lookup tables I see "-.-.-" Can both be used or is one of the morse codes valid?
3
votes
4answers
1k views

What's this maybe-morse-code “CQ CQ GE EDEN” and “DD” in Le Eden de la Grisaia?

The ending song of an anime television series called Le Eden de la Grisaia here has a light flashing. I suspect it may be Morse Code. By watching the video a little more slowly than usual (frame by ...
2
votes
1answer
3k views

Decoding the Morse code

I am using a crystal to transmit morse codes, and I am using Kenwood radio receiver to obtain the signal. It receives the signal with a lot of noise, though we can figure out the morse code sound. I ...
3
votes
1answer
864 views

Difference between Iambic keyer modes?

What is the difference between Iambic Keyer mode A and mode B? Are there any other popular keyer modes? Why would one choose one mode over the other? If only one Iambic keyer mode is to be ...
5
votes
3answers
934 views

How slow is slow telegraphy?

On the UK Band Plan there are frequencies stating “QRS (slow telegraphy) Centre of Activity”. For example, 14,055 kHz on 20m and 3,555 kHz on 80m. What is considered slow? (<15 wpm?) How close ...
2
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4answers
316 views

CW “training” recordings

I'd like to get some recordings of typical receiver audio output of HF CW transmissions. I'd like to both train my mental copying capabilities and look into improved automatic (software) CW ...
3
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2answers
569 views

Looking for a morse code decoder that simulates keyboard input

I know that there are several commercial programs that will decode incoming CW using the computer's sound card, but this is not quite what I need. The specific requirement that I have is to feed the ...
6
votes
3answers
489 views

Morse Code Key Grease

I just got an old brass key at a hamfest, and it appears to be in pretty good mechanical condition, aside from some dirt and dust. Taking it apart, the key (apologies for not knowing the exact ...
3
votes
1answer
335 views

Where exactly is the Morse code character “;” defined?

I've seen that quite often in Morse code tables (for example here), under punctuation, a semicolon ";"character is listed. However, the ITU-R M.1677-1 doesn't specify that character as a part of ...
5
votes
2answers
142 views

Air gapped digital communications mode on VHF?

According to this question MCW (modulated continuous wave) is allowed on large portions of the VHF bands in the U.S. Is using MCW suitable for passing small amounts of digital data between 2 PCs or ...
3
votes
3answers
530 views

Consistency of Morse Code/CW sending speed

How important is it to maintain a consistent Morse Code WPM keying speed when transmitting CW? I occasionally hear operators slow way down when sending RST and location info, and then later ...
10
votes
2answers
713 views

Scoring quality of Morse Code “fist”?

When learning, teaching oneself, or training a class in Morse Code sending using a hand key, how can acceptable quality be scored (other than the letters being correct terms of dot-dash sequence)? ...
2
votes
2answers
137 views

Morse code help

http://vocaroo.com/i/s0fsMOJ82A7k Trying to decipher this morse code if someone can help me. It's 14 characters long and the first lot is Illuminatih I think.
2
votes
1answer
784 views

Where can I find the definition of the Q Codes as they should be used in amateur radio (CW)?

Where can I find the definition of the Q Codes for amateur radio? So far I could only find ITU-R M.1172 ANNEX 1 Miscellaneous abbreviations and signals to be used for radiocommunications in ...
7
votes
5answers
4k views

Should I learn morse at “both” speeds?

There are many anecdotes of hams learning Morse Code at e.g. 5wpm and then "hitting a wall" trying to gradually speed up to 15wpm. David G. Finley, N1IRZ claims the reason is this: Morse at 5 wpm ...
2
votes
2answers
2k views

Is there a preferred order for learning Morse code using the Koch method?

The Koch method of learning Morse code is based on the idea that you learn characters at full speed, but a reduced set of characters that is expanded over time, instead of learning the full set of ...
3
votes
3answers
789 views

Comms between Raspberry Pis over CW on 40m

I'm completely new to amateur radio, so please forgive me if this is a silly question. I'm looking at these devices: Assembled HAM RADIO 40M CW HF QRP Pixie Transmitter Receiver 7.023-7.026MHz DIY on ...
0
votes
1answer
198 views

CW paddle interface wiring problem

I have the MFJ-564B iambic paddle which I need to wire to the MFJ-552 CW interface. The paddle is stereo (dits/dahs) and the interface is mono (when connected to paddle, only gives DITS). How can I ...
1
vote
0answers
67 views

Is it suitable to use DSSS in a narrow-band channel for a power-starved system

I want to build a system that can transmit data through 2-way radios as far as possible. I use the "line-in" as the input of the baseband signal in the transmitter and use the "audio out" as the ...
1
vote
6answers
679 views

Looking for a CW Tutor app [closed]

Is there an app that sends random morse code that I can copy to paper, then shows me what was sent for me to check my work? Basically an app that works like the MFJ-418 Code Tutor. All the apps I find ...
0
votes
1answer
230 views

Testing my HB-1B QRP CW Transceiver on 40m

I'm a new ham and have only used 2m/70cm so far. I have recently completed a QRP CW setup: a YouKits HB-1B transceiver and a simple wire dipole. I haven't made any contacts yet, and I'm wodering if ...
8
votes
6answers
6k views

International characters in Morse Code?

Does the official International Morse code include alphabetic characters other than the 26 letters of the English alphabet? If so, what are the most common other alphabets or characters that one ...
1
vote
1answer
120 views

Where can I find documentation on Handicode? [closed]

Apologies, this may be off topic. Ham radio operators are the probably the only community that might have used Handicode. Back in 2002, a company "Microsystems Software" made a DOS program that ...
5
votes
6answers
22k views

How to convert a Morse Code Message/QSO from Mp3 file into text?

I tried to use both: Cwget CW decoder But neither one worked. Can you recommend a tool or an alternative approach to decode a Morse message saved as an Mp3 file?
2
votes
0answers
237 views

How can I connect a CW keyer to my Mac and transmit CW on VHF? [duplicate]

I currently have a Kenwood TM-V71A 2m/70cm transceiver that I would like to connect to my Macbook to transmit morse code, using the cocoaModem software. Aside from the cables needed to connect the ...
5
votes
1answer
250 views

History and significance of term “lid”

What is the history on the term “lid” when referring to a telegrapher’s capability? How did it originate and what is the significance if any of each letter?
2
votes
1answer
2k views

Morse code for hash (#)

Is there a morse code for a hash character? If so, what is that morse code? My thoughts where that there is morse code for an @ but why not for a #?
2
votes
1answer
1k views

Do I need a Balun for a single band QRP antenna?

I have a little MFJ QRP CW 20m rig that I plan to turn into a portable kit for SOTA peaks. I have everything figured out except for the antenna. I am wanting to make a dipole. However, I was wondering,...
0
votes
2answers
3k views

Wiring a CW paddle

What kind of cable would be suitable for wiring an MFJ-564B Iambic CW Paddle to an Icom IC-718? I have heard that you can just use a length of old electric guitar cord but I was not sure what to do.
4
votes
1answer
231 views

Listening below the carrier frequency gives a weaker signal than above the carrier frequency - why?

I have a 20m CW transceiver with an option for a wide or a narrow filter. When the narrow filter is selected, a crystal ladder filter is used in the intermediate frequency filter, between two mixers. ...
5
votes
4answers
675 views

What if someone responds to my CQ, but I can't hear him?

I tried making a CQ on 20 m, 14.060 MHz (the QRP CQ frequency) and parallel to that I had a WebSDR on my computer just to keep an eye on the band. I saw someone responding on the WebSDR, which is ...
3
votes
3answers
1k views

CW contact content

I received my license and built and tested my first CW transceiver. I've spent the last weeks learning Morse code. Now, time has come to make the first contact. But what is a typical CW contact? When ...
1
vote
2answers
2k views

Do I really need a side-tone oscillator?

I'm throwing together bits-and-pieces towards my rig on a less than shoestring budget. It is possible to apply a take-off from the key and use it to drive a piezo-buzzer. Of course, there won't be any ...
2
votes
2answers
131 views

Terminology for written “CW-like” Code?

Morse Code is defined by most dictionaries in terms of sequences of short and long signals. What would be the most common or most descriptive terminology for un-timed written or printed code, where ...
5
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3answers
3k views

How are capital letters sent in Morse code?

There is only one alphabet in Morse code, so is there a recognised way to indicate a capital letter?
5
votes
3answers
387 views

Characteristics of a “bad fist”?

What are some characteristics, when sending CW, of a "bad fist"? How bad can it get, typically, and still manage to communicate the message text sent to a human operator on the receiving end? Contra-...
5
votes
2answers
434 views

Circuit to send MCW on 2m FM

I regularly practice Morse with a friend on 2m NFM by holding our tone generators, which we also use for personal practice, close to the microphone. We send text by CW, read it back, and discuss how ...