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

[Riho B., ES7AAZ]

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>) 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>) 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>) 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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