Digital voice fits in 1.2 kHz and digital image can fit in 1.2 kHz so why not do both simultaneously on HF?
73, John KD6OZH ----- Original Message ----- From: Rick W To: digitalradio@yahoogroups.com Sent: Thursday, September 18, 2008 21:06 UTC Subject: Re: [digitalradio] Re: Emision designators for EasyPal These "channels" are produced by transmitters that are designed to do this, such as sending a separate stream on USB and and another on LSB. While we can not do that with most current amateur type equipment, maybe something like this would be possible with DSP type rigs? While we would likely never want to do this on HF, it is possible for VHF and certainly quite reasonable for higher bands. The RFSM2400 waveform is mostly the same as MIL-STD-188-110A and is a high baud rate (2400 baud) single tone protocol modulated as 8PSK. Depending upon the bandwidth (there is the wide standard mode and a slightly narrower amateur mode that may work better for some transmitter's passband capabilities) the bandwidth characters (first number and letters) will of course vary, but if used for "data" transmission with an SSB transmitter, it would be the usual J2D. Some of the MIL-STD/FED-STD/STANAG protocols (and there are quite a few) also support any kind of information, including images and voice so that would change the last letter to C or E as needed. 73, Rick, KV9U John B. Stephensen wrote: > More than 1 subcarrier doesn't seem to make a difference to the FCC - > only the number of channels of information. 2 channels would typically > be image and voice. FDMDV is classified as 1K20J2E in the description > on the ARRL web site. I haven't looked into RFSM2400. > > 73, > > John > KDOZH > >
