by carrier frequency I am referring to the actual frequency of the signal. If you were tuning in a shortwave broadcast station which was transmitting on 7285kHz where it's mode was AM (amplitude modulation) then 7285kHz would be it's carrier frequency.
In the case of an on-off keyed signal like the PIP or a CW signal, if your radio is set to USB or LSb (upper or lower side band) and you tune the signal so that you are hearing a tone of about 1kHz (1000 hz) then your radio would be set to a frequency 1kHz below 7285kHz or 7284kHz if you were in USB mode and if you were in LSB mode then your radio would be tuned 1kHz high from the carrier frequency.
Make sense?
There is a mailing list on groups.io called UDXF which you might find interesting (if you haven't already stumbled across it)
http://www.udxf.nl/forum.html on how to subscribe
http://www.udxf.nl/ute-info.html lots of info to get you going. There was a beginners guide somewhere but I can't put my finger on it at the moment. You might find the FAQ useful:
http://www.udxf.nl/UDXF-FAQ-v4_6.pdfOh, and one tip, whenever you post something it would be helpful to others if you included an indication of where you are located. Specific coordinates are not needed just something general to give an idea on your location. It is helpful for others who might see your post and have a listen to try and hear what you are reporting. It gives them an idea as to whether or not they might be able to hear it as well.
cheers, Graham near ottawa Canada