It is my belief that if "voice" of the same bandwidth were allowed everwhere "data" is allowed, the data segments of the bands would be overrun with phone stations using DV. Phone is the easiest to operate and obviously the preferred mode. During the "bandwidth petition" discussions, it became clear that the phone people wanted to take over as much space as they could, which is understandable, since the phone bands are always overcrowded.
I don't pretend to know the real reasoning behind the FCC determination that DV is phone (just like analog voice), but practically, it currently serves to protect digital mode operators from being overrun by a multitude of phone operators. In light of the fact that you can sometimes copy an analog phone signal through another analog phone signal, but cannot do that with DV, I think we are fortunate that the FCC has taken the position they have. Skip KH6TY ----- Original Message ----- From: "Rick" <[EMAIL PROTECTED]> To: <digitalradio@yahoogroups.com> Sent: Saturday, December 22, 2007 10:13 AM Subject: Re: [digitalradio] 30 Meter digital > My use of the band is mostly based upon propagation and, as you pointed > out, minimal competition with other stations. This is particularly > important with non-cw digital modes since they are typically much wider > than cw and can not tolerate too much overlap in interference. > > Here in the U.S. could you use it for digital voice? The FCC made a > determination that DV and analog voice are considered ... voice, and > since voice is not permitted on the band for us, we could not use such a > mode. Which is a bit strange when you consider that someone listening to > the raw data would have no way of knowing if it was voice or other kind > of of "data." > > Even if we move toward bandwidth, rather than mode bandplans, it appears > that modes will still play an important part. And in the past few > months, I would have to say that I am much less supportive of > segregation by bandwidth since many of the modes simply do not play well > together. In particular, digital modes are severely impacted by even > slight interference from modes such as SSB voice. This has become more > noticeable on bands such as 40 meters with stations outside of the U.S. > going down low in the band, even in what has been mostly digital data > watering holes. > > For daytime range, the 30 meter band goes farther than 40 meters, so > 1000 mile contacts are quite reasonable. > > 73, > > Rick, KV9U > > > Andrew O'Brien wrote: >> I was reading the 30M Digital Group web page ( >> http://www.30meterdigital.org/ ) and thinking a bit... Much of what >> is posted there makes sense to many of the people that are avid users >> of the digitalradio Yahoo group. The band is not crowded with >> contests, there is less competition with other modes, etc, etc. So, >> perhaps we can make more of an effort to use this band, Has anyone >> tried it for Digital Voice. ? Also, what typical range does the band >> afford in daylight and evening conditions? >> >> >> >> > > -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.17.6/1192 - Release Date: 12/21/2007 1:17 PM
