Message-ID: <005901cd6a90$a40a5d70$0401a8c0@xphd97xgq27nyf>
From: "mal hamilton" <g3kevmal@talktalk.net>
To: <rsgb_lf_group@blacksheep.org>
References: <CAK59VFNOneVPmCEjVc1kK3FpvfmCX5qp_gZo5-AFy58Hmiq-6g@mail.gmail.com> <500FF064.1030109@iup.uni-heidelberg.de> <DEF0879101734958AE61D0D590E070DF@AGB> <500FFDDD.6070204@iup.uni-heidelberg.de> <16CA55FCF4C44B789AA114D2CCB51D1B@AGB> <004f01cd6a8c$7566a7c0$0401a8c0@xphd97xgq27nyf> <50103225.5040003@iup.uni-heidelberg.de>
Date: Wed, 25 Jul 2012 18:09:32 -0000
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Subject: Re: LF: 4X OP32 report
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Stefan
There are software programmes about that can read CW and print it on screen
especially machine sent CW es QRSS
The facility already exists but it is another level of demodulation that is
unnecessary. Basic CW and good EARS or QRSS and a VISUAL observation are the
preferred methods

de mal/g3kev

----- Original Message -----
From: "Stefan Schäfer" <Stefan.Schaefer@iup.uni-heidelberg.de>
To: <rsgb_lf_group@blacksheep.org>
Sent: Wednesday, July 25, 2012 5:51 PM
Subject: Re: LF: 4X OP32 report


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
chance to use QRSS-3 instead and program an application that will decode
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 they
> need another level of demodulation and cannot really compete with the
basic
> 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 lost.
> 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
>
>
>
>> schrieb   Stefan, :)
>>
>> Why do you think so?
>>
>> Its linked to the  DSP  engine  in Op , there is a  timing  issue  , if
>> other  applications  lock the  sound  card at a  different   rate , due
to
>> the  % tolerances  , low level  decodes  can be  lost ,   noting, Op is a
>> 'data  mode  , so the  overheads in the  transmission  are  much  higher
,
>> 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  2.5Khz
>> B/w ?
>>
>>
>>
>>
>> --------------------------------------------------
>> From: "Stefan Schäfer"<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
>>
>>
>>> Am 25.07.2012 15:51, schrieb Graham:
>>>
>>>> Pity  nothing decoded  in the  US last night , but  signal 's in 1500
>>>> /2000 mile  range where  quite  substantial ...
>>>> from this , it seems  that propagation  on 136  is  really  linked to
>>>>
> the
>
>>>> seasons ?
>>>>
>>> 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 the
>>> solar activity. Don't know how the condx have been yesterday.
>>>
>>>
>>>> One  point  from previous  trials , If  Spec-lab  is  used  with  Opera
>>>> , then  SL must  be  set to  48Khz  sample  rate , or  OP can loose
>>>>
> low
>
>>>> level decode sensitivity.
>>>>
>>> Why do you think so? As long as the frequency range of a SSB bandwidth
>>>
> at
>
>>> 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 kHz.
>>>
>>>
>>> 73, Stefan
>>>
>>>
>>
>