Unauthorized US 60m WSPR activity on 5.2872 MHz
As evidenced in the WSPR database, some US hams are transmitting on the default WSPR 60m dial frequency 5.2872 MHz which is outside FCC authorized 60m channels.
Some of the questionable 60m reports in the WSPR database appear to be uploads from stations with HF receivers that are not synchronized with the WSPR program frequency, such as in this listing http://wsprnet.org/olddb?mode=html&band=60&findreporter=w4djw
But others are truly operating the WSPR software on its default 60m dial frequency of 5.2872 MHz, unaware that this is outside US authorized frequencies. This problem appears to have been ongoing for some time now, see http://wsprnet.org/drupal/node/3703
US amateurs can only legally transmit 60m data modes like WSPR on one of the five FCC assigned USB dial frequencies: 5330.5, 5346.5, 5357.0, 5371.5 or 5403.5 kHz, with the WSPR program set to transmit in precisely in the center of the channel, that is, 1500 Hz. Refer to http://www.arrl.org/60m-channel-allocation.