Good morning Jeff and everyone,
AOR makes a digital voice unit which is intended for amateur hf use. I have
read posts to the HFPack list from people who are using it both in base and
portable setups.

Evidently, the normal audio from the radio is passed through the unit so
that you can hear regular analog signals and all of the atmospheric noise
but when a digital voice signal is detected and the two voice units sync all
of the background noise and static are muted and all you hear is speech
until the transmission has ended.

73


Ron Miller
N6MSA
Clearwater Florida
SKYPE: arjay1

-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Jeff Kenyon
Sent: Friday, August 04, 2006 10:18 AM
To: [log in to unmask]
Subject: Re: Digital Voice

I don't know, but the most experimenting I have heard with digital voice has
been the APCO-25 digital in use for public safety.  It is because public
safety radios for VHF/UHF can tune the ham bands and use the digital voice
mode.





On Fri, 4 Aug 2006, Colin McDonald wrote:

> what about the D star radios from Icom? don't they do some sort of 
> digital voice?
> I know they do digital data, but i thought they also did some sort of 
> digital voice incription as well.
>
> only problem with doing digital voice on the amateur bands is that it 
> has to be a completely open source incription type that anyone could 
> easily decode since if it weren't,it could be considered secret 
> encoded messages, which, as far as i know, are illegal in the US as 
> well without permission from the FCC?
>
> The canadian regulations, paraphrasing of course, make it illegal to 
> use any kind of secret code to pass messages without express 
> permission from the government.  Digital voice incription could 
> potentially fall under that category.
> If someone was using say provoice or even apco 25 on a local simplex 
> frequency, it would be nearly impossible for me, or anyone else to 
> know what they were saying since we wouldn't have the necessary codec 
> to decode their transmission.  The transmission would there for be in 
> a "secret" code and against regulations.
> Now,if a person offered the software or instructions on how to build a 
> decoder on a website, or in a popular monthly magazine, the idea of 
> secretive incoding would be no longer secretive since many people 
> would have the means of decoding it.
> just my view point anyway,i could be off the mark on this one, but i 
> have pondered it for some time since our 52 group has tossed around 
> the idea of digitalizing our transmissions.
> 73
> Colin, V A6BKX
> ----- Original Message -----
> From: "Jeff Kenyon" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Friday, August 04, 2006 2:40 AM
> Subject: Re: Digital Voice
>
>
> > Hi, there is an external card for APCO-25 modulation for the Uniden 
> > BC259D scanner, but nothing I know of for the ham bands.  There have 
> > been a few experiments though with APCO-25 useage on the ham bands
though.
> >
> >
> >
> >
> >
> > On Thu, 3 Aug 2006, Frederick wrote:
> >
> > > Hi
> > >     I have been wondering for sometime if there are any digital 
> > > voice converters that a person could plug in to there older analog 
> > > rigs. I
> think
> > > that transmitting and receiving in digital voice on the ham bands 
> > > would
> be
> > > the coolest thing.
> > >                     God bless,
> > >                     Mark WZ0K
> > > God loves you!
> > > My personal prayer book.
> > > Add your prayer or pray for others at the following link.
> > >
> http://prayerbook.homewithgod.com/cgi-bin/prayerbook/multi.pl?13196111
> 3534708:24:0
> > >
> > > http://lists.topica.com/lists/funhamradio.
> > > http://groups.google.com/group/funhamradio-list
> > >
> > > http://funhamradio.bloki.com
> > >
> >
>