Posts Tagged ‘CW Key’
Another portable test of the BLT+ tuner
|KX3 operating on internal battery. What a fantastic portable rig.|
I took the BLT+ balanced line tuner out to the Excalibur antenna site to try it out on the doublet antenna that we put up last Saturday. This was the first test of that antenna (40m and 80m using a common feedpoint).
|BLT+ connected to open wire line (under the gloves) going to ta 40m Doublet at 65ft|
I used the BLT+ to tune the 40m/80m doublet. Balanced line antennas perform better with a tuner designed for balanced line and this was a good test for both the tuner and the new antenna.
|Portable shack, courtesy of three plastic chairs|
I quickly matched the doublet using the BLT+ using the lowest impedance setting which is also the most efficient. I was glad to see that the BLT SWR LED indicator is bright enough to be seen in direct sunlight. I was wondering about that but you can definitely tell when it dims even in direct sunlight.
AA4OO sitting back and listening to the QSO
The Doublet's feed line has not been brought to the shack yet so I was just sitting under the antenna. The open feed line is running along the ground for a bit which certainly didn't help the signal but we haven't installed the posts to carry the feed line over to the shack and I was too lazy to move the chairs far enough away to keep the feed line in the air.
In the foreground is some saw-grass common on the NC coast. I'm not sure why it's growing this far inland.
|Portable shack at the Excalibur antenna site... The Doublet is 65 feet above my head|
|Waiting my turn in the QSO... holding the Palm Single Paddle. BLT+ tuner in the chair to the right|
Behold… mechanical beauty
|N3ZN ZN-QRP Iambic Paddle (sporting my new call sign)|
I re-entered the amateur radio hobby in the summer of 2015 after a bit of a hiatus. To get my General license in 1996 a Morse code proficiency test was required. At that time I had purchased a cheap MFJ practice key and a used version of the ubiquitous Bencher BY-1 paddle. My Bencher was in reasonable shape but I just never became comfortable with it. It always felt a bit imprecise to me and I wasn’t happy with the width and size of its paddles.
You can't always get what you want, but you try sometimes...
|Key lineup... Palm Single (paddle), Vibroplex Bug (circa 1970s), Kent Hand key|
It only seems pointless until you try
|1 mighty watt|
My assumptions are often incorrect
Calling QRP CQ - Inconceivable
Amazingly my 80m Windom / OCF Dipole has 4.5:1 SWR native around 1.8 mHz and it matches easily with a tuner across the entire 160m band. That was a surprise.
I tossed my mighty 5 watts call out at 1810 kHz not expecting much...
So how do you know if and where your signal is getting out ?
The Reverse Beacon Network
|Map of the last 100 reports from Reverse Beacon stations of my call sign|
Color coded by band
It even includes a speedometer
|My brief speed key session with N4HAY|
Vibroplex Bug Morse Keys
|Vibroplex Original Semi-automatic Bug|
The Vibroplex semi-automatic Bug is considered a manual key by the SKCC (Straight Key Century Club) so it counts in SKCC contacts.
|Wrap the pendulum weight with solder to slow it a bit|
Here is a video running through the keys to see if learning a Vibroplex messes up my ability to use a paddle with an electronic keyer
The Vibroplex Bug next to a Kent Hand Key.
|Manual Morse Code Keys|
Amaze your friends / Confound your enemiesOk so maybe all the cool kids aren't doing it... who wants to be a cool kid anyway? They have issues.
So whats up with all this beeping?
Morse code is fundamentally a method of encoding every letter in the alphabet plus numbers and punctuation as two pieces of data. Two sounds actually, one 3 times longer than the other. If you were to speak the two sounds out loud one would sound like DIT and the other DAH. That's it. That's all you have to know. Two sounds, one 3 times longer than the other. There, and you thought this would be hard? Pah!
|Beep Beeeeeep -- There you have it... Morse Code. Any questions?|
Why is it called Morse Code?
Why learn Morse code?
CW is small but powerfulCW uses between 100Hz and 150Hz of bandwidth compared to 2400Hz - 3000Hz used by phone modes. That makes it about 20 times more efficient, or put another way, your signal to noise is improved by a factor of 20 over phone. It's also easier to copy (interpret) a CW signal down in the noise than a spoken voice.
So you want to learn "the code"
A "C" in Morse Code sounds like DAH DIT DAH DIT. It has a beautiful rhythm when you listen to it out loud. Go ahead and shout it out, you've got nothing to lose at this point.
So, if you have toyed around with learning Morse Code and have some visual chart with dots and dashes. Shred that chart right now. Go ahead and do it. I'll wait... Did you shred it? Ok let's proceed.
One wrong way
Morse Code was a requirement for my General amateur radio license in 2006, but I only had to prove copy skills at 5 words per minute. Someone recommended a set of tapes that employed mnemonic phrases to memorize each letter. Basically each letter "sounds" like some phrase. I'm going to tell you one of the mnemonic phrases as an example but please immediately erase it from your memory because it takes a long time to un-learn this method. The letter "Y" sounds like the following phrase said out loud "Why did I die?" OK, now just imagine you've memorized some phrase like that for every letter of the alphabet and punctuation mark. Now every time you hear a letter in Morse Code one of these phrases runs through your head and you have to let it run its course before the letter pops out on the other side of your consciousness. You can understand how crippling this becomes when the speed goes above 5 words per minute. Trying to counts DITs and DAHs hits the same wall.
One right way
I'm not going out on a limb to say there is only one right way to learn Morse Code so I will say that what follows is "One right way" to learn the code and it is working for me.
This method is recommended by the ARRL and is implemented by many applications used for Morse Code training. This allows you to learn the sound of the letters at the full target speed you want to operate at. If you learn the sound of the letters at 13wpm then you will find yourself stuck there until you relearn them at a higher speed because you're learning to recognize sounds, not DITs and DAHs. Our brain has an easier time of slowing a sound down than speeding it up so if you start at the target speed the slower speeds will work themselves out. I started with a target speed of 18wpm and I am kind of stuck there right now, while learning the sound of the characters at a higher speed to progress. I wish I had originally chosen 20wpm as my target speed because in my experience that is a common speed in many QSOs.
Farnsworth MethodLearn the sound of the letters at the full target speed you wish to be able to copy.
Keep the speed of the letter spacing (silence between the letters) to be at your current learning speed to give you thinking time. I.e. you're letter spacing may be set at 8-10wpm to start out with while you're actually learning the characters at a target speed of 20wpm.
Your training should also incorporate the Koch Method which directs the order in which you learn the letters, numbers and punctuation and determining when to progress to the next element.
Koch MethodBegins with just two characters (K, M). Once strings containing those two characters can be copied with 90% accuracy, an additional character is added, and so on until the full character set is mastered.
Code TrainerI looked at a number of different code trainers. I tried PC applications, mobile device apps and internet based applications. I live in a very internet connected place and I nearly always have access to the internet. I don't always have my PC with me but I do usually have access to a guest PC or a mobile internet capable device so I chose a website that has a training application that incorporates both the Farnsworth and Koch methods and would keep track of my progress.
Learn CW Online http://lcwo.net/
Learn CW Online is a really nice Morse Code tutor. You create a login for it to keep track of your progress and settings for character speed and effective speed. It has multiple ways to train so try the different ones out to find out what works best for you. I used the Koch Method CW Course which is accessible after you log in. It starts out with two letters and keeps track of your accuracy, making suggestions as to when you should add an additional letter. There are 40 lessons in that course which include the alphabet, numbers and punctuation. I've read that other people really like the MorseMachine application on that site.
After you've gone through all 40 Koch lessons you may still have trouble with a particular set of characters. Use the Code Groups application to work through your stumbling blocks. Lastly natural language training is provided in the plain text training application which sends real sentences at your speed settings. You can also paste text into the convert text to cw application and download the resulting MP3 to practice off-line.
Listen to real QSOs
Secondly you'll begin to start copying the myriad of abbreviations and prosigns and jargon used during QSOs that exists nowhere outside of amateur radio CW conversations. As you come across new "words" that you copy. Circle them until you begin to recognize what they mean. Some of the abbreviations are standardized but many others are just shorthand and sometimes unique to a particular operator or region. You'll also start to become familiar with the way operators communicate their goodbyes which vary greatly in content, abbreviations and length. Some goodbyes in morse code seem to take as long as the entire previous part of the QSO. In other cases the conversation ended and you didn't even hear the door slam behind you.
A word about Morse Code translators
Pace yourself and have fun
Morse Code is a mode for folks that don't have a lot to say but want to take a long time to say it; so why rush?
Sending Morse Code
Personally, I'd recommend that you hold off practicing sending code until you have worked through all the lessons and can properly copy. Your brain needs time to memorize the proper sound for each letter. If you start practicing too soon you could develop poor timing habits that will take time to correct.
I have had a little over 300 CW QSOs now and while that is still a relatively small number easily a 3rd of them have been lengthy ragchews lasting over 20-30 minutes so I've spent a lot of time "off-script" from the standard exchange. At this point I don't have to concentrate much on what I'm sending, it just comes out. I only have to think about spelling long words.
Remember the golden rule. It's better to send good code than receive.
What kind of key
The video below discusses some difference in learning to send on a straight key versus a paddle...
|Straight Key (manual key)|
Straight keys are simple, inexpensive and can work with many inexpensive practice oscillators such that you don't need a radio to practice sending. The disadvantage of straight keys is that your reflexes are entirely responsible for properly spaced DITs and DAHs in addition to intra-character and word spacing. The advantage is that after some practice they become an extension of your arm and simply repeat what you're hearing in your head. I personally started with a straight key and still like to use one for the majority of my QSOs but it's a personal preference.
Paddle with electronic keyer
|Paddle -- requires electronic keyer|
A paddle works with an electronic keyer. The disadvantage of a paddle is it requires additional equipment and that you will be learning a different reflex from the actual code that is in your head. I.e. when you send an I or an S or an H you are not reflexively sending the DITs that make up the letter but are instead training yourself how long to depress the paddle for the string of DITs. This is a new skill and doesn't directly correspond to what you hear in your head. The advantage to using a paddle with an electronic keyer is that the keyer will send perfect length and ratio DITs and DAHs every time so your reflexes don't have to be as quick or precise. Also it requires far fewer movements of your hand to send code with a paddle and you won't tire as quickly as you would with a straight key. I won't go into the concept of squeeze keying here. For now don't worry about it.
As to the specifics of using a paddle with a keyer:The electronic keyer may be external or built-in to the radio. If it's external then it will normally have a speaker or mic jack to provide a sidetone allowing you to practice without connecting to a radio. If you don't have an external keyer and want to practice with a paddle you will need a radio with a built-in electronic keyer and be aware how to set it to not transmit for practice. Usually this is accomplished, strangely enough, by turning off VOX (which stands for voice activation) in the radio's menu. Keyers have a speed setting and weighting. Speed seems pretty obvious. Weighting is the ratio of the length of the DIT to the DAH in length. In general the weighting should be set to a higher value when you are sending at a slow speed and set to a lower value as your speed goes up.
Your first on-air QSO
You are ready to venture into your first, heart pounding, fight or flight response on-air QSO
If none of those options present themselves then just go for it on-air. Find an ongoing QSO that you feel you can copy or is moving just slightly faster than you can copy. Copy the call-sign of the station you can best copy and wait for them to sign with each other (they will each send their 73s / 72s and send a DIT DIT at the very end). Then call that station.
AA4XX AA4XX DE N4PBQ N4PBQ N4PBQ PSE QRS KNIf you've been listening to regular QSOs you'll recognize the form above. The repetition of the other station's call is to get their attention. You repeat yours for their benefit. The PSE QRS is asking them to slow down and the prosign KN means you're asking only them to respond. Have a prepared QSO text ready in terms of what to send. The SKCC beginners corner has a good sample QSOs.
Here is a sample QSO from when I was just venturing onto the air.
What is going on in the radioAs far using Morse Code in radio communication is concerned; a transmitter modulates a 100Hz to 150Hz wide signal called a Continuous Wave or CW at a particular frequency. The time the signal is transmitted corresponds to the length of time the trasnmitter key is depressed. When listening on a receiver you hear a tone whose pitch is determined by your offset from the frequency of the transmission. If you are listening exactly on the same frequency you will hear nothing because there will be zero Hz offset. So most modern receivers offset the receiver frequency above or below the signal and offset their own transmit frequency by the chosen offset. So if the offset is 750Hz you will hear a 750Hz tone if you are exactly on frequency with the other station. Confusing? Good, you're well on you way.
I've jotted down my thoughts on the ins and outs (mostly outs) of learning Morse Code as part of my QRP Ham Radio adventure. I think it is relevant enough to visitors to the Ham Radio QRP website to make it a static page available from the main menu:
Operating QRPI had the day off today and it was a beautiful morning. I decided to spend part of it at Lake Wheeler Park in Raleigh, NC operating QRP from a stone bench under a tall oak tree.
Can mean operating from a "Quiet Restful Place"
|rock 'n radio|
I threw a line over a tree using a throwing weight. I hit my mark the first time, untied the weight, tied on the end of the antenna, and hoisted the 31 foot end-fed up exactly where I wanted it with the feed point a couple of feet off the ground.
|31 feet of wire end-fed by a 9:1 balun.|
A kite string winder holds the throwing line
A metal stake with a bit of rope anchors the balun and the other end of the rope
|Another view of the end-fed with 9:1 balun, stake and coax|
|QRP operating position|
I called CQ on the 20m QRP calling frequency (14.060) and had a brief QSO with a lot of QSB (fading). I didn't hear much activity that early in the morning on 20m so I dropped down to 40m and worked the QRP calling frequency (7.030) and had my call answered right away. After that QSO another station jumped in there calling for a specific station so I moved on. 40m was busy. Every time I thought I'd found an open frequency someone would jump back in or if I called QRL? I'd get an R R.
The Palm key has a clip-on, magnetic base which I use to temporarily attach it to my clipboard when I'm not sending. When I'm ready to send I simply pull it off the clipboard and hold it in my left hand. As I noted in an earlier review of the Palm Single Paddle it can be used as a straight key if you turn it on its side. The long ragchew I had on 30m was with a gentlemen who sent me his SKCC number in the first exchange so I quickly turned off the electronic keyer in the KX3's and turned the Palm Single on its side. That station sent me a nice compliment on my straight key FIST; so the little Palm Single key can serve duty as a paddle into a keyer or (in a pinch) as a straight key. I far prefer to use my Kent Hand Key if I'm operating manual key but it's too big to bring along for portable operations and I can't quite picture myself trying to hold onto the giant Kent Hand Key with one hand whilst operating it with the other like I can the Palm Single.
|The Palm Single Paddle works great in portable operating positions|
|What could be finer than to be in Carolina in the Mooo-oor-ning|
|Enjoying the last nice days of our Fall... birds singing and morse code beeping|