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[Linrad] Re: off subject Delta 44
- Subject: [Linrad] Re: off subject Delta 44
- From: Stan W1LE <verizon.net; stanw1le@xxxxxxxxxxxxxxxx>
- Date: Mon, 30 Mar 2009 18:38:11 -0400
The Delta-44 PCI soundcard has a max sampling rate at 96,000 samples per
sec at 24 bit quantization.
using a single channel, you can display/use up to 48 KHz wide spectrum.
Using I and Q channels, can display/use up to 96 KHz spectrum.
Lotsa broadcast band and other energy out there impinging on the
soundcard input, when fed directly.
Add a band pass filter around you freq of interest and away you go.
Low pass filters or high pass may also be effective.
Lotsa more energy in a lightning storm at low freqs.
Do not forget the potent LORAN-C TX's at 100 KHz.
The 137 KHz and 160-190 KHz Lowfer bands would not be covered in a 1 or
setup unless you do a block down conversion after the antenna and before
Would work with the rare 17.2 KHz SAQ broadcasts from Sweden..
If you want to use the WSE stuff for lowfer work, , build a block up
converter to feed the
2.5 MHz IF box or the 10.7 MHz IF box or the 70 MHz IF box.
Others have put together a program with GUI for SAQ, 17.2 KHz RX
directly from antenna into soundcard.
Now, If you had a 24 bit, 192 KHz sampled soundcard and I + Q channels,
then you could make the 137 and 160-192 KHz RX work.
The commercial selective volt meters or receivers like the HP-3586A/B/C
or the RYCOM 6041 selective level meter would work, well with limitations.
For my VLF RX work I use a ICOM IC-703+, direct tunable down to 100 KHz
and with factory TXCO to stabilize the LO for QRSS/CW 120 copy and no
I feed the fixed level audio output to the soundcard and use ARGO, WOLF,
to decode.I also use a IC-706MK2G.
My plan is to add a G4HUP external reference to the 706 to
eliminate freq drift on RX (only) due to the fan thermal cycle.
IMHO the HP-3586 is a pig on AC power and operating position real estate.
But, you can use a GPSDO 10 MHz reference to stabilize most of the LO's
(but not the last LO).
The Rycom 6041 is a great portable RX but is not freq stable for QRSS/CW
at 120 second dots.
Others use a ICOM R75 for lowfer RX
Jeremy Alexander wrote:
> Aloha to all:
> I am curious about using the delta 44 and the Linrad for lowfer listening. What precautions should I follow before connecting antenna to input of the sound card. Also I am sure someone is doing this, what kind of success would one have with this setup over say a commercial selective voltmeter type receiver? The dual antenna thing is curious to me at LW and wonder who is doing it, please contact me: jeremy@xxxxxxxxx
> Mahalo! w7eme
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