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<p>----- Forwarded Message ---- <br>
From: jk1zrw <<a href="mailto:7m3tjz%40jk1zrw.ampr.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">7m3tjz@jk1zrw.ampr.org</a>> <br>
Sent: Thursday, October 25, 2007 9:56:15 PM <br>
Subject: Re: UT118 Adaptor <br>
<br>
--- Tony Langdon <vk3jed@...> wrote: <br>
> <br>
> At 10:45 AM 10/26/2007, you wrote: <br>
> <br>
> >Yes, it works any band. Only requirement is AF bandwidth of your <br>
rig. <br>
> >If SBB of HF has above requirement, we can use D-STAR in HF. (I ma <br>
> >nore sure now.) <br>
> <br>
> SSB radios typically don't have the bandwidth, as they cut off <br>
> sharply around 300 Hz on the lower edge of the passband, due to the <br>
> crystal filters used in 99.99% of radios. You would normally use <br>
FM <br>
> mode in any case, resulting in the same 6.25 kHz wide signal as <br>
used <br>
> on VHF (which would be legal on any amateur band in Australia, as <br>
it <br>
> fits within the 8 kHz bandwidth limit). However, the performance <br>
is <br>
> likely to be lousy, and any attempt to use D-STAR based systems on <br>
HF <br>
> would require a more appropriate modem for HF conditions in my <br>
opinion. <br>
<br>
Yes, your are right now. SSB radios typically used crystal filter. <br>
But recent tequnical development are too fast, so we can make the <br>
ssb signal using Software (like SDR). For example, JH1DTX successed <br>
to modulate/demodulate from 50Hz to 3000Hz with PSN-SSB method <br>
(this is not SD mnethod). So, I think we can make the D-STAR rign <br>
in HF near future. The bandwidth(in AF) of D-STAR is 20Hz to 2400Hz. <br>
If future SBB rig has this bandwidth, we can. <br>
<br>
Satoshi 7m3tjz<br>
<br>
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