FreeDV Frequencies
Band	Frequency kHz	Mode	Locale
80m	3.6250	USB, 700D	Netherlands
80m	3.6430	USB, 700D	United Kingdom
80m	3.6930	USB, 700D	United Kingdom
80m	3.6970	USB, 700D	United Kingdom
60m	5.3665	USB, ?	Europe (No USA allocation)
60m	5.4035	USB, ?	United States
40m	7.0450	USB, ?	Argentina
40m	7.1770	USB, ?	Australia
20m	14.2360	USB, ?	United States
20m	14.2400	USB, ?
17m	18.1180	USB, ?
15m	21.3130	USB, ?
12m	24.9330	USB, ?
10m	28.3300	USB, ?
10m	28.7200	USB, ?

Source: https://freedv.org, http://qso.freedv.org (requires prior login at https://www.hamqth.com).

FreeDV HF Modes
Mode	Date	CODEC	Modem	RF Bandwidth	Raw bits/s	FEC	Text bits/s	SNR min	Multipath
1600	2012	Codec2 1300	14 DQPSK + 1 DBPSK pilot carrier	1125	16000	Golay (23,12)	25	4	poor
700C	2017	Codec2 700C	14 carrier coherent QPSK + diversity	1500	1400	-	-	2	good
700D	2018	Codec2 700C	17 carrier coherent OFDM/QPSK	1000	1900	LDPC (224,112)	25	-2	fair
700E	2020	Codec2 700C	21 carrier coherent OFDM/QPSK	1500	3000	LDPC (112,56)	25	1	good
2020	2019	LPCNet 1733	31 carrier coherent OFDM/QPSK	1600	3000	LDPC (504,396)	22.2	2	poor

Source: https://www.youtube.com/watch?v=OfDkjVXrtOI at time index 26:44.

Applications for 700C vs 700D are as follows (source: time index 15:02 at https://www.youtube.com/watch?v=qVWQc2Cg13c&t=1613s ):

• 700C works better on fast fading signals
• 700D works better on slow fading signals and signals with a low Signal to Noise Ratio (SNR)

An audio demo of 700C, 700D and 2020 modes can be found starting at time index 18:20 at: https://www.youtube.com/watch?v=qVWQc2Cg13c&t=1613s