<div dir="ltr"><div>That makes sense, Willi, i.e. that perhaps there was a bandwidth restricted version distributed outside of the US, but never inside the US as far as I know.</div><div><br></div><div>It has always amazed me that nobody blinks an eye at the AM fanatics who often take up as much as 40KHz bandwidth, but as soon as an ESSB signal shows up using 4 or 5KHz it's the end of the world.</div><div><br></div><div>Once upon a time AM was attractive because it was the only way to obtain larger audio passbands. With the advent of ESSB this can now be achieved with much greater spectral efficiency. And with the proliferation of spectral displays on radios from all vendors, SDR and otherwise, it is much easier to find a friendly spot on the band, or know when it is time to be a good citizen and reduce bandwidth.</div><div><br></div><div>73!</div><div><br></div><div>Scott/w-u-2-o</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Apr 13, 2020 at 5:01 PM Willi Reppel <<a href="mailto:wi.re@telia.com">wi.re@telia.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
<div bgcolor="#ffffff">
<div><font size="2" face="Arial">Hi Scott,</font></div>
<div><font size="2" face="Arial">It is possible that Flex Radio Systems had
different versions of programs in their library for Europe. I noticed after
downloading of a new version after 2005</font></div>
<div><font size="2" face="Arial">that certain improvements were made and I could not
choose any longer said 10 kHz bandwidth and the keying speed was also limited to
30-45 wpm.</font></div>
<div><font size="2" face="Arial">It was great fun to send short music tu-nes in ssb
to show the outstanding per-formance of the SDR 1000, having in mind that this
was illegal in Sweden and most other countries in Europe. A FM-type of high
reproduction quality was confirmed by listeners who were instruc-ted to widen
their rx bandwidth.</font></div>
<div><font size="2" face="Arial">I´ll try to put my vintage SDR 1000 in operation
again and hope to find the old program on one of my defunct
compu-ters.</font></div>
<div><font size="2" face="Arial">vy 73 es cuagn de</font></div>
<div><font size="2" face="Arial">SM6OMH Willi</font></div>
<blockquote style="border-left:2px solid rgb(0,0,0);padding-left:5px;padding-right:0px;margin-left:5px;margin-right:0px" dir="ltr">
<div style="font:10pt arial">----- Original Message ----- </div>
<div style="font:10pt arial;background:rgb(228,228,228)"><b>From:</b>
<a title="scott.traurig@gmail.com" href="mailto:scott.traurig@gmail.com" target="_blank">Scott
Traurig</a> </div>
<div style="font:10pt arial"><br></div>
<div dir="ltr">
<div>I had a Flex-3000. The PowerSDR software client application provided by
Flex that ran that and the other legacy series Flex radios allowed a 10KHz
transmit passband (20KHz on AM).</div>
<div><br></div>
<div>The SmartSDR software client provided by Flex for the current day Flex
radios also allows 10KHz (20KHz on AM).</div>
<div><br></div>
<div>The software clients for openHPSDR architecture hardware, PowerSDR mRX PS
and Thetis, both allow 10KHz (20KHz on AM).</div>
<div><br></div>
<div>As far as I know there were no versions of the above applications that
limited the TX passband to 3KHz.</div>
<div><br></div>
<div>There are no regulations in the US that set limits on the
bandwidth of amateur radio phone signals except on 60M.</div>
<div><br></div>
<div>73,</div>
<div><br></div>
<div>Scott/w-u-2-o</div></div></blockquote></div>
</blockquote></div></div>