I am very keen to learn to read and send CW/Morse and know I need to learn to read first but I just wanted to see how the straight key shapes up that I have. Had it hooked up for around 3 days and today noticed something thats puzzling me... The key will send if I select USB/CW and also LSB and USB. With BK-IN selected. I have been listening to my test transmission on my local on-line SDR on-line receiver...at 5w.on 160m I'm not sure but apart form today I seemed to be able to select any freq and I would be able to hear my tone on the SDR on-line. But now if I select say 1815.00 on my 450 and key up...I hear or seen no trace on the SDR...if I tune 1815.50 everything is fine I hear my tx with the tone and see the trace on the online sdr waterfall. On some freq I see my TX trace on the SDR but hear no CW tone. Also noticed if the 450 is tuned to freq say 1900.00 that may change when I key to 1900.50 when I key and revert back to 1900.00 when I un-key. Am I setting something wrong or do I have a problem. One more thing...if using CW can USB or LSB be used whatever band is being used. AS you can see I have a lot to learn re CW.