There is nothing holding back such experimentation here in the U.S. For one thing, you don't even need to test this on HF first. If it ever proved to be successful on VHF/UHF in a narrow bandwidth format, then it could be adopted for HF use as well.
Just wishing something technical to happen or believing that you can have multiple voice conversations within the ultra narrow 3 KHz or so BW is very unlikely due the scientific limitations. But even if current theory was shown to be false and a breakthrough ever occurred, it would be easy to test on HF. The bandwidth proposals seem to me to LIMIT the future possibilities for new voice and high throughput modes on HF due to the very limits placed up the maximum bandwidths permitted on HF. Right now the main limit is baud rate. From what the best minds in the commercial world have been able to come up with, we don't see any digital voice modes that are narrow (~ 3 KHz). While the reason for the required move to digital was to narrow the BW's, they are still much wider than 3 KHz if I understand the current state of the art and while they work fairly well under good signal conditions, they can be a problem under difficult conditions where older analog signals may get through when the digital ones do not. The move to digital seems to be more related to spectrum conservation. Even though high data throughput real time modes are difficult to work with narrow BW signals, we should see some improvement (and we have) with data modes that do not have to be as much in real time and which have a magnitude less signalling rate throughput needs. I see no legal framework changes that will "free" developers to do all that much on HF except for the baud rate increase. But that did not need a sea change to implement. As you know you have made pronouncements about this and were asked to give examples of what limitations were now present with existing rules and you have not responded. The one limitation that I have been most concerned about is the ability to mix data/voice/(analog or digital)/ and image on one frequency. Based upon ARRL statements and looking at the overall plan, I am not sure if this will be allowed under new band plans. Rick, KV9U Dr. Howard S. White wrote: > JIm: > > You have made a very good case as to why we need to experiment and > come up with new technologies... > > Instead of concentrating on all the potential and imaginary > negatives... which very much reflect the old anti SSB and anti FM > arguments...you need to look at the positives... > > There are a myriad of technologies for squeezing high baud rates into > tiny channels... there are a myriad of new and not so new technologes > out there ... such as TDMA, CDMA and Spread Spectrum... > > It's going to take some clever hams to develop these into a practical > DV system for HF on Ham Radio... > > I believe that the technology is there to allow multiple QRM free > multiple QSO's to share a standard HF voice bandwidth... some ham > needs to put it together... and some ham (likely not in the USA under > current baud rate limited rules) will likely do it.. > > Equipment.. Anything Hams develop will likely be computer based... > maybe even sound card based as that is the cheapest technology.... and > it is likely that you will still be able to use your HF transceiver.... > > New Modes: Stop being so negative.....Heck... new modes is what > this Reflector is all about... Olivia, Contestia...new versions of > DV...we welcome new modes as they improve things.... > > I do not have all the answers.. I just know that there has to be a > better way..... > > DV... has lots of potential to give us more channel capacity with less > QRM... we just need to legal framework in place so that we can > experiment with it to dispell all those imaginary negatives.... > > Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org Other areas of interest: The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/digitalradio/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
