Hi Tony , More than 60 hour’s that was quite a feat !
There are some interesting points linked to the development of the vara modem
The initial version, did deploy a change of protocol for the lower speed ranges , but, with development , the data rates / s/n of the ofdm modem , exceeded the conventional mfsk rate/s/n.
Actually better than 2fsk conventional rtty , hence the modem remains ‘single protocol’ ofdm with ‘low on air rate’ at all speeds , with advantages of noise rejection, selective fade , multiple path over narrow b/w mfsk
Q: When amtor changes to mfsk, do you note a higher level of power consumed ,ie , the supply current to the Tx increases , if so , what change ?
Q: Is it possible to run tests of the vara modem against the Pactor 4 modem, can anyone perform such a test ?
There is a interesting ‘clash of concept’ , with the use of high speed serial carriers , and the low on air rate multiple carriers of the vara ofdm modem , to date , this remains to be explored …