[digitalradio] I/Q Audio

2010-08-10 Thread AC TALBOT
An appeal to datamode software authors...   Could anyone writing / contemplating any datamode software please consider incorporating I/Q stereo outputs and  inputs.    With SDR receivers becoming more widespread, I/Q audio inputs will allow direct use with simple receivers such as Rocky and home

[digitalradio] Direct RTTY Generation

2010-08-03 Thread AC TALBOT
A  back-to-basics question for once...   Is there any modern RTTY datacomms software that gives a single wire digital output for driving an FSK transmitter?   Looked in the MultiPSK and MMTTY setup menus and nothing.     While I realise there may be little call for such a one-wire  drive now (a

[digitalradio] NUE PSK31 Modem

2010-05-22 Thread AC TALBOT
Does anyone have a valid web address for the  NUE PSK31 Modem now.   All the ones found on a Google search seem to be broken   Andy www.g4jnt.com  

[digitalradio] (unknown)

2010-02-19 Thread AC TALBOT
The term "Spread Spectrum"  can apply to any mode that spreads its energy over more than the necessary bandwidth.   If we assume the necessary bandwidth to be equal to the signalling rate than anything other than single carrier modes technically fall into this category.   Even WSPR coul dbe cons

[digitalradio] (unknown)

2009-06-02 Thread AC TALBOT
Strictly, CW is a three symbol code with source coding (variable length alphabet, like varicode) with soft decision coding, and mild FEC (operators interpretation of the code based on S/N) and some convolutional coding with soft decisions (matching characters received against patterns / words.