FreeDV question ...

Gary L. Robinson

Mark Erbaugh

FreeDV is sideband dependent. A station listening in USB cannot decode a station transmitting in LSB. The "standard" for FreeDV has become LSB below 10 MHz. Since the Flex Waveform only works in USB, it cannot decode standard transmissions below 10 MHz.

Gary L. Robinson

Thanks Mark!  Appreciate the info even though it is a big bummer hihi  I think I will see if I can get the latest release of FreeDV program to work with my 6300 and just take the wave form version out for now.

--Gary WB8ROL

David

Flex provide the current version of the FreeDV waveform and has release it to the community to maintain. Hopefully someone is able to pick it up and make the need updates along with adding LSB support. In the meantime the native FreeDV will just like you would use FLdigi.

hans weijers

As FreeDV is not a digital but a voice mode, FDV must follow the sideband conventions on the amateur bands, So LSB under 10Mhz and USB above as said before. Keep in mind that the current FreeDV waveform from Flexradio still has problems with spikes, due to timing problems in the 6000 series, which can end up with damaging, even destroying, a LDMOS amplifier. Just get the latest FDV program at freedv.org (V1.2), install it on your Flex PC, configure the (virtual) audio and PTT settings, use DIGI-L or DIGI-U and be able to decode and transmit in FDV mode. A bonus is that you will not only be able to use the 1600 mode but also 700B, 700C and 800XA mode. We in The Netherlands use this method with great succes.
73, Hans PA0HWB

Chris

except for reasons of intransigence or habitual tradition, there is no reason to use LSB with a mode using a digital transmission on any band. since the great majority of digital transmissions are USB, and government and military long ago transitioned to USB below 10 MHz, so too should FDV use USB on all HFs bands.

my 0.02 USD.

= 73 =