Very similar to the article in QST back in the early 60's where they detailed the new findings that under certain conditions, signals sent with less power, were able to get through better because they did not "burn" the ionsphere. High powered stations would frequently damage the ionosphere with this "burn effect" and be much less effective.
It was many years later that I finally realized that this was in an April edition of QST and that April had a significance to the article that escaped me as a teen trying to understand all this new stuff. 73, Rick, KV9U Andrew J. O'Brien wrote: >Just received this and thought I would pass it along, looks like a new one >to play around with! Software is available from my site (see below). > > >Announcing a new digital mode that uses the sound card of your PC. This one >is DUSK-A1. developed by Walter DU1SK. DUSK has some fundamental >differences from the other digital modes (PSK, MFSK Olivia, etc) in that this >mode >has been developed primarily for the low bands (80 and 160) with an emphasis >on grey-line propagated signals. DUSK-AI takes advantage of AMI- Alternate >Mark Inversion . Many digital hams will already be aware that AMI has a >12.5% density minimum. The reduced density minimum of DUSK-A1 creates a >more tolerable AOA, or Angle of Arrival >A position identification technology that detects the direction of a signal >received from a transmitter at only one point. In this system, the >transmitter's location is determined from the receivers' antenna position >and the AOA of the signals that are from the antennas. In practical terms, >grey-line like conditions are created regardless of the actual position of >the sun. > >DUSK-A1 grey line performance, and sun position irrelevance , is also >enhanced by the inclusion of CTA. Continuous Time Oversampling A technique >that simplifies the job of synchronizing data generated from disparate >sampling rates. The technique resamples and synchronizes audio data as >needed, and it eliminates the substrate noise and feedthrough problems. > >The beta version of DUSK-A1 also includes Enhanced Data Rates for Global >Evolution an enhanced radio modulation technique for GSM and TDMA >(ANSI-136) networks that expands radio timeslots . The expanded time slots >also factor in enhanced daylight propagation , especially on 160 meters. >When combined with GPRS, it gives a maximum performance with narrow >bandwidth. > >The software does not have full macro features or logging components as yet. >Those wishing to test this new mode may download the free software at >DUSK-A1 from http://www.obriensweb.com/dusk.htm > > > > >------------------------------------------------------------------------ > >No virus found in this incoming message. >Checked by AVG Free Edition. >Version: 7.1.385 / Virus Database: 268.3.4/299 - Release Date: 3/31/2006 > > 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/
