The answer is: yes you can. It is part of the set-up for WSPR on the U3S. To set the clock you will need a clock that shows seconds. It can take a little practice to get close but anything less then 30 sec. should work for a few hours.? As for a loop antenna, OM0EM has a very good qrp multiband (40m-10m) magnetic loop antenna.
Paul
KD9JYV
