[hpsdr] HPSDR(Mercury, Pannylane, adn Metiz) and PowerSDR version

[Greg and Roberta]

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.

For local armchair contacts you may desire something flatter.

73, Greg, ZL3IX

On 2021-10-21 00:09, Riho B., ES7AAZ wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
> Hi Helmut,
>
> 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!
>
> Kontakt Riho B., ES7AAZ (<es7aaz at gmail.com <mailto:es7aaz at gmail.com>>) 
> kirjutas kuupäeval T, 19. oktoober 2021 kell 19:30:
>
>     Hi Helmut and all,
>
>     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.
>
>     Kontakt Riho B., ES7AAZ (<es7aaz at gmail.com
>     <mailto:es7aaz at gmail.com>>) kirjutas kuupäeval E, 18. oktoober
>     2021 kell 17:12:
>
>         Hi Helmut,
>
>         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.
>
>         --
>         /73,/
>         /Riho ES7AAZ/
>         /
>         /
>         Kontakt Helmut Oeller (<dc6ny at gmx.de <mailto:dc6ny at gmx.de>>)
>         kirjutas kuupäeval E, 18. oktoober 2021 kell 16:23:
>
>             ***** High Performance Software Defined Radio Discussion
>             List *****
>
>             Hi Riho,
>
>             in most countries on this globe the SSB-bandwidth is
>             limited by local
>             law to 2700 Hz net. BTW this also complies with the ITU
>             regulations.
>             More bandwidth make no sense as SNR drops and  no more
>             readability can
>             be achieved. On crowded low bands it's also a symbol of
>             courtesy to
>             claim not more than 3 KHz. We need no imitators of BBC
>             speakers.
>
>             73, Helmut, DC6NY
>
>
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>
>
>
>
>     -- 
>     /73,/
>     /Riho ES7AAZ/
>     /www.qrz.com/ES7AAZ <https://www.qrz.com/db/ES7AAZ>/
>
>
>
> -- 
> /73,/
> /Riho ES7AAZ/
> /www.qrz.com/ES7AAZ <https://www.qrz.com/db/ES7AAZ>/
>
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