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Re: LF: LF Receiver

To: <[email protected]>
Subject: Re: LF: LF Receiver
From: Jan Verduyn <[email protected]>
Date: Thu, 17 Jan 2008 07:53:38 -0000
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Peter,
 
Can you please provide some details of the Softrock mod by Jim M0BMU covering the two LF bands.
 
Thanks.
 
I am using a Softrock lite here on 500 Khz using a 4096 Khz Crystal and can confirm sensitivity is good,
however a better input filter maybe needed in some locations as there is some breakthrough from strong Local Broadcast stations (Radio Bristol) mixing with the 2nd harmonic of the LO.  Ie 1548 - (2 x 512 ) = 524 Khz = +12 Khz
In the Softrock the image is audible when tuned to 500 Khz (-12 Khz)
 
73s
 
Jan G0BBL
 
 
----- Original Message -----
Sent: Wednesday, January 16, 2008 4:04 PM
Subject: Re: LF: LF Receiver

Hi Laurie
It is great to see a technical discussion on the reflector. It?s much better than using the reflector as purely the return path of a one way VLF qso!
I have been using a Tony Parks? KB9YIG Soft Rock SDR RX (about £20 kit from WS) for some time now.  I use the excellent free SDR application software from Duncan Munro M0KGK 1.1 with Cesco?s  HB9TLK.DLL (Loop.DLL) VAC (Virtual Audio Cable) software link to Patrick Lindecker F6CTE?s Multpsk 4.2 decoder software.  Soft Rock does use the IQ sound card input but this way only the one card is needed. The results are incredible for such a small out lay. I think this setup outperforms most conventional RX in terms of selectivity and ease of use over a limited spectrum, 48kHz using built in soundcards and 96kHz using a high quality int /ext  Soundcard. 136 and 500 kHz bands are only about 3 kHz wide so it gives ample coverage of the EU and US beacon frequencies as well. Please also note that Jim Moritz M0BMU has done an excellent mod to the current Soft rock 6.2 kit that gives these two bands as they are not standard in the Soft rock kit range.
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