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Frequency response tailoring should depend on the application. For
weak signal and competitive operation (contests and pileups) I
always use a shaped passband of 300 Hz - 2.4 kHz. The shaping is in
the form of a response rising at 6 dB/oct from 300 Hz to 1 kHz. Most
of the intelligibility in human speech is contained in the energy
above 1 kHz.<br>
<br>
For local armchair contacts you may desire something flatter.<br>
<br>
73, Greg, ZL3IX<br>
<br>
<div class="moz-cite-prefix">On 2021-10-21 00:09, Riho B., ES7AAZ
wrote:<br>
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<pre class="moz-quote-pre" wrap="">***** High Performance Software Defined Radio Discussion List *****
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<div dir="ltr">Hi Helmut,
<div><br>
thanks for pointing out the 2.7kHz SSB TX bandwidth law and
SNR stuff. I did a little research about human voice spectrum
and I found an article which says, "In general, the
fundamental frequency of the complex speech tone – also known
as the pitch or f0 – lies in the range of 100-120 Hz for men,
but variations outside this range can occur. The f0 for women
is found approximately one octave higher. For children, f0 is
around 300 Hz." I narrowed W1AEX 2.8kHz SSB TX profile down
to 2550Hz (same as 2.4kHz RX filter in PowerSDR) and I see no
difference in SSB TX quality. Anyway, 2100Hz seems too narrow
for SSB TX. So, I leave my SSB TX profile 100-2550Hz. Thanks
again!<br>
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Kontakt Riho B., ES7AAZ (<<a
href="mailto:es7aaz@gmail.com" moz-do-not-send="true">es7aaz@gmail.com</a>>)
kirjutas kuupäeval T, 19. oktoober 2021 kell 19:30:<br>
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<div dir="ltr">Hi Helmut and all,
<div><br>
</div>
<div>I did modify upper edge of W1AEX 2.8kHz SSB TX profile
a bit. It now corresponds to 2.7kHz RX filter. I really
like the W1AEX 2.8kHz SSB TX profile. He has done an
excellent job in all these settings - Leveler, ALC, CFC,
Post-CFC EQ, Phase Rotator, TX EQ. It sounds superb on
air.<br>
</div>
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Kontakt Riho B., ES7AAZ
(<<a href="mailto:es7aaz@gmail.com" target="_blank"
moz-do-not-send="true">es7aaz@gmail.com</a>>)
kirjutas kuupäeval E, 18. oktoober 2021 kell 17:12:<br>
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<div dir="ltr">
<div>Hi Helmut,</div>
<div><br>
</div>
<div>Agreed. Most frequently I've seen 2.9kHz SSB
signals on HF and therefore I personally use 2.8kHz
and 3kHz W1AEX SSB TX profiles. In fact, there are
people running 2.7kHz of audio that splatter across
very wide bandwidth.<br>
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<div>--<br>
<div dir="ltr">
<div dir="ltr"><i><font color="#666666">73,</font></i>
<div><i><font color="#666666">Riho ES7AAZ</font></i></div>
<div><i><font color="#666666"><br>
</font></i></div>
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Kontakt Helmut
Oeller (<<a href="mailto:dc6ny@gmx.de"
target="_blank" moz-do-not-send="true">dc6ny@gmx.de</a>>)
kirjutas kuupäeval E, 18. oktoober 2021 kell 16:23:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px
0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">***** High
Performance Software Defined Radio Discussion List
*****<br>
<br>
Hi Riho,<br>
<br>
in most countries on this globe the SSB-bandwidth is
limited by local<br>
law to 2700 Hz net. BTW this also complies with the
ITU regulations.<br>
More bandwidth make no sense as SNR drops and no
more readability can<br>
be achieved. On crowded low bands it's also a symbol
of courtesy to<br>
claim not more than 3 KHz. We need no imitators of
BBC speakers.<br>
<br>
73, Helmut, DC6NY<br>
<br>
<br>
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<div dir="ltr"><i><font color="#666666">73,</font></i>
<div><i><font color="#666666">Riho ES7AAZ</font></i>
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<div dir="ltr"><i><font color="#666666">73,</font></i>
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