Message-ID: <50103225.5040003@iup.uni-heidelberg.de>
Date: Wed, 25 Jul 2012 19:51:33 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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Subject: Re: LF: 4X OP32 report
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That reminds me about a thought i recently had:

If the decode level of OP8 can be compared to QRSS-3, isn't there a=20
chance to use QRSS-3 instead and program an application that will decode=20
the callsign???
The other features can be applied as well of course (listing, mapping...).

Then everybody would be happy :-)

73, Stefan

Am 25.07.2012 19:39, schrieb mal hamilton:
> Graham es Co
> While Opera es other data modes are an alternative to CW for a change t=
hey
> need another level of demodulation and cannot really compete with the b=
asic
> CW mode or QRSS CW.
> I often see traces of all data modes that could easily be identified in=
 QRSS
> but they do not decode therefore the purpose of the transmission is los=
t.
> de mal/g3kev
>
> ----- Original Message -----
> From: "Graham"<g8fzk@g8fzk.fsnet.co.uk>
> To:<rsgb_lf_group@blacksheep.org>
> Sent: Wednesday, July 25, 2012 4:07 PM
> Subject: Re: LF: 4X OP32 report
>
>
>   =20
>> schrieb   Stefan, :)
>>
>> Why do you think so?
>>
>> Its linked to the  DSP  engine  in Op , there is a  timing  issue  , i=
f
>> other  applications  lock the  sound  card at a  different   rate , du=
e to
>> the  % tolerances  , low level  decodes  can be  lost ,   noting, Op i=
s a
>> 'data  mode  , so the  overheads in the  transmission  are  much  high=
er ,
>> as are the  DSP  engine  requirements , as can be seen  with  'older' =
pc's
>> cpu loading  can be a  issue , as  is a  one-pass  system , all  the
>> processing  is  taking place in real  time
>>
>> But  on with the  show ,
>>
>> 73 -G..
>>
>> -76 dB  in 28  mHz  b/w    , what  is  that  when  translated  to  2.5=
Khz
>> B/w ?
>>
>>
>>
>>
>> --------------------------------------------------
>> From: "Stefan Sch=E4fer"<Stefan.Schaefer@iup.uni-heidelberg.de>
>> Sent: Wednesday, July 25, 2012 3:08 PM
>> To:<rsgb_lf_group@blacksheep.org>
>> Subject: Re: LF: 4X OP32 report
>>
>>     =20
>>> Am 25.07.2012 15:51, schrieb Graham:
>>>       =20
>>>> Pity  nothing decoded  in the  US last night , but  signal 's in 150=
0
>>>> /2000 mile  range where  quite  substantial ...
>>>> from this , it seems  that propagation  on 136  is  really  linked t=
o
>>>>         =20
> the
>   =20
>>>> seasons ?
>>>>         =20
>>> Yes (of course) and no. W1VD received me quite well a few weeks ago, =
see
>>> https://dl.dropbox.com/u/19882028/LF/07_July2012.jpg
>>> Not to forget W1TAG:
>>> https://dl.dropbox.com/u/19882028/LF/DK7FC_Juli2012.jpg
>>>
>>> So there is some propagation in summer but of course it depends on th=
e
>>> solar activity. Don't know how the condx have been yesterday.
>>>
>>>       =20
>>>> One  point  from previous  trials , If  Spec-lab  is  used  with  Op=
era
>>>> , then  SL must  be  set to  48Khz  sample  rate , or  OP can loose
>>>>         =20
> low
>   =20
>>>> level decode sensitivity.
>>>>         =20
>>> Why do you think so? As long as the frequency range of a SSB bandwidt=
h
>>>       =20
> at
>   =20
>>> audio levels passes through the SL filter, then it should be fine. So=
 8
>>> kHz SR should be fine. Of course it depends on which shift frequency =
you
>>> have to use. I have to use 11 kHz shift and so i choosed a SR of 30 k=
Hz.
>>>
>>>
>>> 73, Stefan
>>>
>>>       =20
>>     =20
>   =20