I find a lot of operators using 'BK' and not sure why. It seems that 'K' works just great and 'BT' does a great job also. So.....when should we use 'BK' and why!
The "BK" is normally used after asking a question in CW and allows for send/receive exchange without sending call signs. It is mostly used as a 'short-cut' during a QSO inside of the 10-minute ID rule. At least, that is how I used it for over 40 years.
Hope that helps...
73, Paul - K7IN
That certainly helps Paul, as I have heard BK being used all along in the 35 years I've been on air, so it certainly isn't something new. I agree that is exactly how we used it back then and still use it now. I agree that it may be more prevalent these days because in the old days we pretty much sent our callsigns at the beginning and end of each over.
But these days like all things, everyone is in a hurry, less is more, and I even hear CQ calls that don't end with ANYTHING but the call sign. Even it is getting very prevalent a very bad operating practice that people answer a CQ without sending the other persons call sign AT ALL sometimes even for the entire QSO! That is in my book very bad and also rude, and it is for most licenses illegal as you must send the call sign of the station you are transmitting to at the very start of the contact, then at least once every 10 minutes, and your callsign again at the end of the communication.
So I put a notice on my QRZ page explaining why I'm sometimes not going to answer weak DX calls from anyone who calls with only their callsign and why I like to hear mine, not least to know a) the station is calling me and not in some silly big split pile up again and so I don't waste my time sending an over and then there is nothing (has happened several times before), b) I know the other station copied my callsign correctly and not VK5EE as is so often the case, etc.
I honestly think those types of poor practice are much more serious in their impact and severity than the use of BK or not. Naturally in QRQ High Speed Telegraphy we don't use BK normally we just use full QSK and like in a normal voice conversation we just to and fro anytime the other hits the key. But I do agree that saying BK TO U is bad, especially in QRS, as soon as I hear BK I'm reaching for my key but the other isn't finished :-)