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Yes , I think Gary has 192k cards for
his grabber , with than and sdr-sharp etc the
shift would be no problem
for some reason , fixed band has been the house
standard from day-1
73-G,
Sent: Sunday, December 29, 2013 6:50 PM
Subject: Re: LF: VLF exciter / signal generation in Spectrum
Lab
Hi Graham,
About 74 kHz reception: I recently
discovered that a Lenovo 'X61s' netbook, bought cheaply at a rally, supports
true 192 kHz sampling with the onboard 'soundcard' (once one discovers where to
configure that in the swamped windows 7 system control, or wherever they decided
to put the soundcard control dialog today. IIRC it was "Properties of
Microphone", translated from german into english).
Indeed the usable 'audio'
range covers a few Hz to 96 kHz ! This would allow direct reception on 74 kHz,
and also using DCF77, MSF, or similar time signal transmitters as reference for
the sample rate correction... SL could translate down into the audible
range, and downsample to 48 or 24 kS/second, before sending the converted signal
to other applications.
Anyway it would be much easier if the "hard coded
frequency range" would simply be removed from the original Opera software, and
completely leave it to the human operator to enter the frequency range in a
simple input field.
73,
Wolf .
Am 29.12.2013 18:56,
schrieb Graham:
Thanks Wolf,
With the 8K signals out side the Op decoder ,
some users wanted to monitor the test ,
but needed a way of changing the qrg
slightly to match ,
The other thing , that occurred to me
, was the other 75 K stations , may have a TA
chance using Op4H , +6 dB gain over op1H in
the 'window' time , may be 1 run or
2 max ? ... recovering the 8K audio may be
a problem , my ra6790gm has a locked
bfo range of +/- 19KHz or so , but ,
for normal ssb-rx , then a shift up
from 1500 would be needed [ may even catch Bob
on 4H hihi]
73-G,
Sent: Sunday, December 29, 2013 1:25 PM
Subject: Re: LF: VLF exciter / signal generation in Spectrum
Lab
Hello Graham,
Am 29.12.2013 14:04, schrieb
Graham:
Wolf,
Q How to configure SL as audio
frequency changer ?
say 1500 Hz to 8 KHz , or , 8100 to
8200 etc
how is the set up ?
The
easiest way is using the 'narrowband filter', which can also shift
frequencies.
Start by selecting 'Quick Settings' in the menu, then 'Other
amateur radio modes', 'Narrow CW filter with adjustable xyz'. You can see the
filter's passband on the main frequency scale, along with the 'zero beat'
indicator similar to a web sdr. Grab the passband widh the mouse and move it
to the 'source' frequency range. Alternatively, enter the frequency shift in
numeric form on the filter control panel. Details:
http://www.qsl.net/dl4yhf/speclab/filters.htm#filter_controls_on_main_freq_scale
will SL appeared as a sound source
? It can, but unfortunately only as an ASIO device.
Microsoft's ever-changing driver model is so utterly complex that I gave up
writing my own 'multimedia driver'. Also I didn't feel like re-inventing the
wheel for XP, Vista, Win7, Win8, and whatever-comes-next... :o)
Thus the easiest (??) method would be to use Virtual Audio Cable.
The
more complex (but VAC-less) way, if ASIO is supported by the audio-receiving
application, is decribed in the 'Audio I/O' manual:
http://www.qsl.net/dl4yhf/AudioIO/AudioIO_Manual.pdf
The
relevant chapter would be "Installation of in_AudioIO.dll as an ASIO
device".
Now back to the soldering iron..
73, Wolf
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