[hpsdr] Pan adapter passband accuracy

[Marc OLANIE]

Agreed... Thanks Helmut

A "hard coded" bw limitation is definitely a nonsense. A limitless signal input It's the easiest way to work on experimental wide band digital transmissions, and it's a pitty that low minded "hifi ssb pundit" are messing with HF regulation. 
Ham radio is essentially motivated by experimentation, and restricting an open source/open hardware project on the sole basis of "contest-contact stacking-enhanced CB-like" kind of use is the best way to confine and asphyxiate (and finally kill) our hobby. 

Imho
73'
 Marc f6itu
-----Message d'origine-----
De : Hpsdr <hpsdr-bounces at lists.openhpsdr.org> De la part de Helmut Oeller
Envoyé : lundi 13 avril 2020 11:07
À : 'Willi Reppel' <wi.re at telia.com>; 'Dean' <vk5lb at yahoo.com.au>; hpsdr at openhpsdr.org
Objet : Re: [hpsdr] Pan adapter passband accuracy

***** High Performance Software Defined Radio Discussion List *****

Hey Willi,

how many years of  HPSDR experience are necessary to recognize the 'problem'? Are 15 years enough? :)

It's more important that scaling and other readings on HPSDR displays are absolutely accurate.

But it's another story, if people disregard the ITU (not IRAU!) recommendations to use a net bandwidth of 2.7 kHz for SSB. No wonder, we can daily watch the violaton of international commitments by egomanics or check the compliance of speed limits on the road.

BTW, there doesn't exist a 'problem'. There are good reasons to make this variable  AF bandwidth available. E.g. think on experimental work on bands above HF together with transverters.

73, Helmut, DC6NY


-----Ursprüngliche Nachricht-----
Von: Hpsdr [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Willi Reppel
Gesendet: Montag, 13. April 2020 10:13
An: Dean <vk5lb at yahoo.com.au>; hpsdr at openhpsdr.org
Betreff: Re: [hpsdr] Pan adapter passband accuracy

***** High Performance Software Defined Radio Discussion List *****

Hi Dean,
Sending from Sweden to "down under" my best wishes for your Happy Ester festivities.
The problem you report is well know to older users of HPSDR. In the beginning of Gerald Youngblood´s Software Radio programs, you  could choose all audio frequencies in SSB from zero to 10 kHz. I made short test QSOs with ham operators of my region here and they reported a FM-radio-like audio quality when  trans-mitting a short tune of musik with an audio bandwidth of
10 kHz. However, the receiver of my illlegal transmission was asked to tune his bandwidth in recption to a maxi-mum.
Later on the US-authorities interfered and reminded Flex Radio Inc. to restrict the choice of audio bandwidth to max 3000 Hz. They complied and in later versions of HPSDR software radio programs, the bandwidth became limited to the legal regulations in the US.
Yet, may be  that some smart programmers change this part of HPSDR and allowing themselves a greater bandwidth again.
This is my guess work, but::What can be done will be done will be done by wizard programmers.
vy 73 gl es cuagn de
SM6OMH  Willi

---- Original Message -----
From: "Dean" <vk5lb at yahoo.com.au>
To: <hpsdr at openhpsdr.org>
Sent: Monday, April 13, 2020 6:20 AM
Subject: [hpsdr] Pan adapter passband accuracy


> ***** High Performance Software Defined Radio Discussion List *****
>
> Happy Easter to all,
>
> I see many signals on my panadapter that seem wider that 3KHz.
> They are usually strong signals but I am not sure the spectrum scope 
> is accurately reporting the received stations bandwidth.
> Any comments on spectrum scopes on HPSDR and in general such as on 
> Icom etc?
> I doubt their accuracy.  Very curious.
>
> Dean VK5LB.
>
> Sent from my iPad
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