[hpsdr] Pan adapter passband accuracy

[Helmut Oeller]

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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