This is one recording from Massachusetts of the WG2XKA 630 CW (472 kHz) signal on 13 November 2016.

0029 UTC

DE WG2XKA WG2XKA FN33LQ VT

Receiving setup:

• FN42ne (Massachusetts)
• 160 meter inverted L
• USRP (version 1) Rev 4.1
• LFRX-LF Rev 2.2 daughterboard
• HDSDR version 2.75 beta 1
• ExtIO for USRP version 1.8 beta 2

Shortly after this, there was a stronger signal from a Pennsylvania station on 474.5 kHz, giving the callsign WD2XSH/46 but explaining that his former callsign was WG2XJM.

0148 UTC

THIS IS WG2XJM WG2XJM ERIC ERIC PA PA, MY XJM GRANT EXPIRED XJM EXPIRED HI HI SO USING OLD XSH CALL HI BT BT TU RPT ES CU LTR 73 73 AR XSH/12 DE WD2XSH/46 K

This is not a good 630m receiver choice. Version 1 of the USRP is a "vintage" SDR from 2005. According to the manufacturer's web site, "The LFRX daughterboard ... ADCs ... provide a relatively high noise figure (NF) - in the order of 20-30 dB ... [with] BPF, LNA and USRP hardware ... cascaded NF [of] approximately 14 dB [can be achieved]." For this 630m reception, no external amplification or filtering was used. There was simply a direct connection of the antenna to a daughterboard of the USRP, which was connected to the computer via USB.