Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk02.r1000.mx.aol.com (Internet Inbound) with ESMTP id A118E380001B4; Fri, 5 Apr 2013 11:56:22 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1UO8yU-0003dh-9w for rs_out_1@blacksheep.org; Fri, 05 Apr 2013 16:54:46 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1UO8yT-0003dY-JG for rsgb_lf_group@blacksheep.org; Fri, 05 Apr 2013 16:54:45 +0100 Received: from smtpout3.wanadoo.co.uk ([80.12.242.59] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1UO8yQ-0006d0-VX for rsgb_lf_group@blacksheep.org; Fri, 05 Apr 2013 16:54:44 +0100 Received: from AGB ([2.26.47.40]) by mwinf5d37 with ME id LFuJ1l00g0s1AyA03FuKWa; Fri, 05 Apr 2013 17:54:22 +0200 Message-ID: From: "Graham" To: References: <122E7FDB629A419F812E13FCF3EAF6BD@AGB> <515DB85B.6090603@iup.uni-heidelberg.de> <1365098839.67356.YahooMailNeo@web133203.mail.ir2.yahoo.com> <515DC8EB.6@iup.uni-heidelberg.de> <515E83F5.6050705@iup.uni-heidelberg.de> In-Reply-To: <515E83F5.6050705@iup.uni-heidelberg.de> Date: Fri, 5 Apr 2013 16:54:18 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Stefan If you need more dynamic range This was a thread on the other mf group , when the possibility of direct-sampling was first announced , but then, only for lynux based systems, using a 24 bit instrument A/D convertor [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.59 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 4bc3491b614f043141ec87e58a12dcbf Subject: Re: LF: Dongel-SDR on LF? Content-Type: multipart/alternative; boundary="----=_NextPart_000_001F_01CE321E.36AA6F30" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.7 required=5.0 tests=HTML_40_50,HTML_MESSAGE, HTML_TAG_EXISTS_TBODY,MISSING_OUTLOOK_NAME 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-global-disposition: G x-aol-sid: 3039ac1d6186515ef4260a3d X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_001F_01CE321E.36AA6F30 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Stefan=20 If you need more dynamic range=20 This was a thread on the other mf group , when the possibility = of direct-sampling was first announced , but then, only for lynux = based systems, using a 24 bit instrument A/D convertor=20 Up to now, no such device has been tested , but it would offer a = solution to the 'large signal ' problem , with 100 dB dynamic range , = the chips are =A37 on ebay . or there is a AD7760 Evaluation = Board=20 Model Price=20 EVAL-AD7760EDZ Status: Production $59.00 =20 http://www.analog.com/static/imported-files/eval_boards/EVAL-AD7760_7762E= DZ.pdf Cypress FX2 usb board's , round $10 , so that's , $70 for a = top level MF rx ?=20 Just need some one , who is conversant with hooking these = things together ! Alberto has all ready offered to write the DLL = ! Any one ? 73-G.. Re: [rsgb_lf_group] SDR 0..1MHz=20 Thinking about an SDR receiver meant for the 0..1 MHz band, a possible,=20 minimal hardware-wise realization could perhaps be that of using an = Analogue Devices AD-7760 ADC, with its superb SNR, sampling at 2.5 MHz, 24 bits, followed by a Cypress FX2 chip to implement a USB dialog with the PC. No FPGA nor DDC would be needed. The hardware would then send a 2.5 MHz stream of digitized data to the PC, which will process them with, e.g. Winrad. Winrad is quite capable of coping with such data = rate. In this very moment I am listening with Winrad and the Elad FDM-S1=20 receiver to a local MW station, and the FDM-S1 is set for a final output frequency (after its DDC) of 3072 kHz. So 2.5 MHz would be a breeze for Winrad. If somebody designs and builds such a hardware, I am more than willing = to write an ExtIO DLL to interface Winrad with it. 73 Alberto I2PHD From: Stefan Sch=E4fer=20 Sent: Friday, April 05, 2013 8:57 AM To: rsgb_lf_group@blacksheep.org=20 Subject: LF: Dongel-SDR on LF? Thanks to all for the advice. Now i have the necessary informations to = start some tests. Has someone tried such a stick on 137 kHz? What is the dynamic range? = You know, the DCF-39 problem... I.e. 60 dB would be problematic here... 73, Stefan/DK7FC Am 04.04.2013 21:08, schrieb Graham:=20 Same stick Stefan=20 The layout is uff/vhf down convertor feeding 28 MHz A/D = , every one started using HF to VHF convertors , but they = have a problem as the off set qrg approaches 'zero' in the = oscillator starts to leak into the signal path=20 At first there was very little code data on the chips , but = some one managed to get the command listings and now , can turn = the down-mixer off or make it idle - and with connecting = directly to the a/d , you now have a HF radio =20 you need to google to buy or for drivers etc ...=20 main chip set for dongle >> RTL2832U + E4000 Amazon , etc = but some of the prices are now a bit silly , some of the = HongKong sellers are adding plugs and software =20 HDSDR =20 SDRSHARP http://sdrsharp.com/downloads/sdr-install.zip <<< very simple , = grabs all the needed files=20 This is the dongle I modified for HF , you can see C2 , = linked to pin 1 of the A/D , just connect to that ( if it was a = one way mod , you could remove the cap to isolate the a/d) http://erewhon.superkuh.com/gnuradio/rtlsdr_QS_FSC_USB_DVB-T.jpg Good luck ! if it go's bang , then its =A310 wasted , not = $1000 ! 73-G. ------=_NextPart_000_001F_01CE321E.36AA6F30 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Stefan
 
If you  need  more  dynamic  range
 
This  was a  thread  on the  other  = mf =20 group  , when the  possibility  of = direct-sampling  =20 was first announced , but  then, only  for  lynux =20 based  systems, using  a  24  bit =20 instrument  A/D   convertor 
 
Up to  now, no  such  device has been  tested , = but  it  would  offer  a solution to the  = 'large =20 signal ' problem , with  100 dB dynamic range , the  = chips =20 are  =A37  on ebay  . or  there  is =20 a   AD7760 Evaluation Board =
Model Price
EVAL-AD7760EDZ Status: Production =
$59.00
 
 
http://www.analog.com/static/imported-files/eval_boards/E= VAL-AD7760_7762EDZ.pdf
 
Cypress FX2  usb  board's  , round  $10  , = so  that's   , $70  for  a  top  = level =20 MF rx  ?
 
Just  need  some  one , who  is =20 conversant   with  hooking  these  things  = together !  Alberto  has  all ready offered  = to  write=20 the  DLL !
 
 
Any one ?
 
73-G..
 
 
 
 
 
Re: [rsgb_lf_group] SDR 0..1MHz =

Thinking about an SDR receiver = meant for the=20 0..1 MHz band, a possible,
minimal hardware-wise realization could = perhaps=20 be that of using an Analogue
Devices AD-7760 ADC, with its superb = SNR,=20 sampling at 2.5 MHz, 24 bits,
followed by a Cypress FX2 chip to = implement a=20 USB dialog with the PC.

No FPGA nor DDC would be needed.  = The=20 hardware would then send
a 2.5 MHz stream of digitized data to the = PC, which=20 will process them
with, e.g. Winrad.    Winrad is = quite=20 capable of coping with such data rate.
In this very moment I am = listening=20 with Winrad and the Elad FDM-S1
receiver to a local MW station, and = the=20 FDM-S1 is set for a final output
frequency (after its DDC) of 3072 = kHz. =20 So 2.5 MHz would be a breeze for
Winrad.

If somebody designs = and=20 builds such a hardware, I am more than willing to
write an ExtIO DLL = to=20 interface Winrad with it.

73  Alberto  = I2PHD
 
 
 
 
 
 

From: Stefan = Sch=E4fer
Sent: Friday, April 05, 2013 8:57 AM
To: rsgb_lf_group@blacksheep.org= =20
Subject: LF: Dongel-SDR on LF?

Thanks to all for the advice. Now i have the necessary=20 informations to start some tests.

Has someone tried such a stick = on 137=20 kHz? What is the dynamic range? You know, the DCF-39 problem... I.e. 60 = dB would=20 be problematic here...

73, Stefan/DK7FC

Am 04.04.2013 = 21:08,=20 schrieb Graham:=20
Same  stick  Stefan
 
The  layout  is  uff/vhf   down =20 convertor  feeding    28 = MHz    =20 A/D    ,    every  one  = started =20 using   HF to  VHF convertors  , but  = they  have=20 a  problem as the  off  set  qrg =20 approaches   'zero'   in the  = oscillator  =20 starts  to  leak  into  the  signal  = path
 
At  first  there  was  very  = little  =20 code  data  on the  chips  , but  some =20 one  managed to  get the  command  listings  = and now=20 , can  turn the   down-mixer   off  = or =20 make  it  idle  -  and with   = connecting =20 directly  to  the  a/d   , you  = now =20 have  a  HF  radio 
 
you  need  to  google    to  = buy =20 or  for  drivers etc  ...
 
main  chip  set  for  dongle >>  =
 
73-G.
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