Return-Path: Received: from rly-mg07.mx.aol.com (rly-mg07.mail.aol.com [172.20.83.113]) by air-mg09.mail.aol.com (v121.4) with ESMTP id MAILINMG093-a2447989b23c8; Thu, 24 Jan 2008 09:06:07 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mg07.mx.aol.com (v121.4) with ESMTP id MAILRELAYINMG076-a2447989b23c8; Thu, 24 Jan 2008 09:05:25 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1JI2gg-0005d5-3J for rs_out_1@blacksheep.org; Thu, 24 Jan 2008 14:04:14 +0000 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1JI2ge-0005cw-W8 for rsgb_lf_group@blacksheep.org; Thu, 24 Jan 2008 14:04:13 +0000 Received: from qmta09.emeryville.ca.mail.comcast.net ([76.96.30.96]) by relay2.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1JI2gZ-00022r-Bj for rsgb_lf_group@blacksheep.org; Thu, 24 Jan 2008 14:04:12 +0000 Received: from OMTA12.emeryville.ca.mail.comcast.net ([76.96.30.44]) by QMTA09.emeryville.ca.mail.comcast.net with comcast id h1qj1Y0010x6nqcA901s00; Thu, 24 Jan 2008 14:03:47 +0000 Received: from WarrenPC ([24.91.18.115]) by OMTA12.emeryville.ca.mail.comcast.net with comcast id h2401Y0062Uxt088Y00000; Thu, 24 Jan 2008 14:04:01 +0000 X-Authority-Analysis: v=1.0 c=1 a=VIwnBwsWAAAA:8 a=COeAEh7mAAAA:8 a=3LvXAftEKI8ZNSeJXn0A:9 a=dyX561OrGJSYmiCsPrYA:7 a=Bsc2P8wkMANu4who-TRcUJ_Ma98A:4 a=wk6s2zzMB60A:10 a=8t1bfcIUh0QA:10 a=9xyTavCNlvEA:10 a=oltf0pfCdT4A:10 a=CjxXgO3LAAAA:8 a=-YLlOlvvwe3b4vmyq70A:9 a=9dEPs7WJweDlOqIpTF0A:7 a=SKa0Tpjh2FzqHTtxRlFeW7z9p_8A:4 a=AfD3MYMu9mQA:10 Message-ID: <9A19E4E5366A41338FA50494BEF73D30@WarrenPC> From: "K2ORS" To: References: <469225.24693.qm@web28102.mail.ukl.yahoo.com> In-Reply-To: <469225.24693.qm@web28102.mail.ukl.yahoo.com> Date: Thu, 24 Jan 2008 09:04:08 -0500 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6000.16480 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6000.16545 X-Spam-Score: -0.1 (/) X-Spam-Report: autolearn=disabled,AWL=-0.134,HTML_MESSAGE=0.001 Subject: Re: LF: Re. LF Receivers Content-Type: multipart/alternative; boundary="----=_NextPart_000_0203_01C85E68.1421FA80" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.7 required=5.0 tests=HTML_20_30,HTML_FONTCOLOR_BLUE, HTML_MESSAGE,MISSING_OUTLOOK_NAME,NO_COST autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-AOL-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_helo : n X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : ? ------=_NextPart_000_0203_01C85E68.1421FA80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dallas Lankford has just done an analysis on the SDR-IQ and found the stron= g signal performance to be wanting: http://www.kongsfjord.no/dl/SDR/SDR-IQ%20Oveload%20Characteristics.pdf 73 Warren K2ORS/WD2XGJ ----- Original Message -----=20 From: Peter March=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Thursday, January 24, 2008 5:10 AM Subject: Re: LF: Re. LF Receivers Hi Laurence Whilst I don't have experience the Perseus SDR RX, I do with Softrock, s= ame principle but simpler execution at radio frequency (and much much cheape= r). You can at zero cost down load SDR software to play with. You can also dow= n load recorded examples of on air activity. This gives you the ability to t= une all over the band listen to various qso's in SSB or CW as if you had the= SDR RF section feeding your computer.=20 This technology is quite unique and very worth while the effort to try out= . Alberto is quite right about the lack of a nice dial knob to turn but if y= ou are wedded to a nice big dial knob you can get a custom encoder that does= just that... at a cost though!! One out of many advantages is you can see the signals as a panoramic displ= ay or as a waterfall you vary the water fall speed and read the qrss CW ....= . The Rocky software has built in PSK decoder and as I understand it other d= ecoder features are to follow. So long as the SDR software you are using has an HP9TLK.DLL file attached=20= and similarly the decoder software then you have a Virtual Audio Cable conne= ctivity i.e. no need for external wire or additional sound cards. The on board sound cards on most PCs are adequate if you are using a IQ co= nnection from your RF stage to the PC i.e. the mic input. It is worth fittin= g a higher quality card see M0KGK's web site for an explanation. One aspect of SDR is this the ability of recording the whole band for late= r interrogation even if you had not tuned to that frequency during the origi= nal recording.=20 The subject is too vast to detail it here but for a very small out lay yo= u can experience it first hand. Also the software is advancing where all the= signal prossing basically takes place so without change to the RF section y= our radio can be up dated at no cost as this advance takes place! Follow the Softrock-40 Interest Group for up to date information. I hope this helps in your search for another RX ...... Alberto's comments=20= are very valid and the beauty is you can try it out at zero cost. I have no commercial interest in SDR I am just a poor retired HAM in every= sense of the word with a Bee in his bonnet ... hi. Try http://www.flex-radio.com/ but ignore all the expensive toys, just the= free software. 73 petefmt=20 lawrence mayhead wrote: Well I managed to fix my RA1792 receiver at last! But all this investigation has whetted my appetite for something better. At the moment I am torn between the AOR7030, conventional non DSP a bit difficult to drive but could be OK with computer display, spec. lo= oks=20 good for LF. Or a take drive in unknown country with the Perseus SDR. I really am in the dark here and would like to know wether is is neccess= esary=20 to re-digitise the audio output in order to get an ARGO FFT display or=20= does it=20 do this itself? and if so can I get 60/120 sec.dot resolution? Any help gratefully received. 73 Laurie ----------------------------------------------------------------------------= -- Sent from Yahoo! - a smarter inbox. ------=_NextPart_000_0203_01C85E68.1421FA80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Dallas Lankford has just  done an anal= ysis on=20 the SDR-IQ and found the strong signal performance to be wanting:
 
 
73 Warren K2ORS/WD2XGJ
 
----- Original Message -----
Peter March= =20
Sent: Thursday, January 24, 2008 5:= 10=20 AM
Subject: Re: LF: Re. LF Receivers

Hi Laurence
Whilst I don't have experience the Perseus SDR RX,  I=20= do=20 with Softrock,  same principle but simpler execution at radio=20 frequency (and much much cheaper).
 
You can at zero cost down load SDR software to play with. Y= ou=20 can also down load recorded examples of on air activity. This gives you th= e=20 ability to tune all over the band listen to various qso's in SSB or CW as=20= if=20 you had the SDR RF section feeding your computer.
 
This technology is quite unique and very worth while the effort to tr= y=20 out.
 
Alberto is quite right about the lack of a nice dial knob to turn but= if=20 you are wedded to a nice big dial knob you can get a custom encoder that d= oes=20 just that... at a cost though!!
 
One out of many advantages is you can see the signals as a panoramic=20 display or as a waterfall you vary the water fall speed and read the qrss=20= CW=20 ..... The Rocky software has built in PSK decoder and as I understand it o= ther=20 decoder features are to follow.
 
So long as the SDR software you are using has an HP9TLK.DLL file atta= ched=20 and similarly the decoder software then you have a Virtual Audio Cable=20 connectivity i.e. no need for external wire or additional sound cards.
 
The on board sound cards on most PCs are adequate if you are using a=20= IQ=20 connection from your RF stage to the PC i.e. the mic input. It is worth=20 fitting a higher quality card see M0KGK's web site for an explanation.
 
One aspect of SDR is this the ability of recording the whole ban= d=20 for later interrogation even if you had not tuned to that frequency during= the=20 original recording.
 
The subject is too vast to detail  it here but for a very small=20= out=20 lay you can experience it first hand. Also the software is advan= cing=20 where all the signal prossing basically takes place so without change to t= he=20 RF section your radio can be up dated at no cost as this advance takes=20 place!
 
Follow the Softrock-40 Interest Group=20 for up to date information.
 
I hope this helps in your search for another RX ...... Alberto's= =20 comments are very valid and the beauty is you can try it out at zero=20 cost.
 
I have no commercial interest in SDR I am just a poor retired HAM in=20 every sense of the word with a Bee in his bonnet  ... hi.
 
Try http://www.flex-radio.= com/ but=20 ignore all the expensive toys, just the free software.
 
73 petefmt 
 
 


lawrence mayhead=20 <laurie.mayhead@googlemail.com> wrote:
Well=20 I managed to fix my RA1792 receiver at last!
But all this investigati= on=20 has whetted my appetite for something better.
At the moment I am torn= =20 between the AOR7030, conventional non DSP
a bit difficult to drive bu= t=20 could be OK with computer display, spec. looks
good for LF. Or a tak= e=20 drive in unknown country  with the Perseus SDR.
I really am in t= he=20 dark here and would like to know wether is is neccessesary
to=20 re-digitise the audio output in order to get an  ARGO FFT display o= r=20 does it
do this itself? and if so can I get 60/120 sec.dot=20 resolution?
Any help gratefully received.
73 Laurie

Sent from Yahoo!=20 - a smarter inbox.
------=_NextPart_000_0203_01C85E68.1421FA80--