Return-Path: Received: from mtain-mj01.r1000.mx.aol.com (mtain-mj01.r1000.mail.aol.com [172.21.164.85]) by air-dd04.mail.aol.com (v129.4) with ESMTP id MAILINDD041-860a4ccbf66fa1; Sat, 30 Oct 2010 06:41:51 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mj01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 8EE6F38000081; Sat, 30 Oct 2010 06:41:49 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PC8qs-0003Px-QS for rs_out_1@blacksheep.org; Sat, 30 Oct 2010 11:39:58 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PC8qs-0003Po-BT for rsgb_lf_group@blacksheep.org; Sat, 30 Oct 2010 11:39:58 +0100 Received: from mailout-de.gmx.net ([213.165.64.22] helo=mail.gmx.net) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1PC8qp-0000iQ-7N for rsgb_lf_group@blacksheep.org; Sat, 30 Oct 2010 11:39:58 +0100 Received: (qmail invoked by alias); 30 Oct 2010 10:39:48 -0000 Received: from p5DC430D1.dip.t-dialin.net (EHLO Clemens04) [93.196.48.209] by mail.gmx.net (mp044) with SMTP; 30 Oct 2010 12:39:48 +0200 X-Authenticated: #17214767 X-Provags-ID: V01U2FsdGVkX1/8gwdoYz3808zX1eTQ4QYPZT8V38jP0gQn/IcZ17 Vs0cv3GkEA3O/g Message-ID: <040001cb781e$c6a2a150$0201a8c0@Clemens04> From: "Clemens Paul" To: References: <4CCAED49.6030007@o2.ie> Date: Sat, 30 Oct 2010 12:39:43 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3664 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3664 X-Y-GMX-Trusted: 0 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: RFspace SDR-IQ Content-Type: multipart/alternative; boundary="----=_NextPart_000_03FC_01CB782F.86E17670" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE 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: 3039400c89a24ccbf66d7b04 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_NextPart_000_03FC_01CB782F.86E17670 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I believe when you are measuring decent crystal oscillators with e.g. the SDR-IQ you can not be sure if you meaure its own phase= noise (of the clock oscillator) or that of the DUT. Indeed one can use *very clean* OCXOs to measure the SDR's phase noise= . I've done this with my Perseus using a Wenzel OCXO (probably the same that Peter Hart uses). 73 Clemens DL4RAJ ----- Original Message -----=20 From: Andy Talbot To: rsgb_lf_group@blacksheep.org Sent: Friday, October 29, 2010 8:58 PM Subject: Re: LF: RFspace SDR-IQ Lovely receiver. And just as useful as a piece of test equipment too - I use mine for= phase noise measurements=20 of crystal oscillators / PLLs when its not receiving LF - HF signals Only downside is that it only shows 190kHz spectrum in one go. Andy www.g4jnt.com On 29 October 2010 16:50, Tony wrote: Hello group. Has anyone any experience with this SDR ? It looks interesting and I'm a bit tempted, especially as it works= full spec down to 500 Hz=20 and "usable" to 100 Hz. But as I have never used an SDR, I haven't got a clue if it's any= good or not. ----------------------------------------------------------------------= -------- Eingehende eMail ist virenfrei. Von AVG =FCberpr=FCft - www.avg.de Version: 9.0.864 / Virendatenbank: 271.1.1/3225 - Ausgabedatum: 10/2= 8/10 20:34:00 ------=_NextPart_000_03FC_01CB782F.86E17670 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I believe when you are measuring dece= nt crystal=20 oscillators
with e.g. the SDR-IQ you ca= n not be sure=20 if you meaure its own phase noise
(of the clock oscillator) or that of= the=20 DUT.
Indeed one can use *very clean* OCXOs= to measure=20 the SDR's phase noise.
I've done this with my Perseus using= a Wenzel=20 OCXO
(probably the same that Peter Hart=20 uses).
 
73
Clemens
DL4RAJ <= /DIV>
----- Original Message -----
From:=20 Andy Talbot
Sent: Friday, October 29, 201= 0 8:58=20 PM
Subject: Re: LF: RFspace SDR-= IQ

Lovely receiver. 
 
And just as useful as a piece of test equipment too - I us= e mine for=20 phase noise measurements of crystal oscillators / PLLs whe= n its not=20 receiving LF - HF signals
 
Only downside is that it only shows 190kHz spectrum in one go.<= /DIV>
 
On 29 October 2010 16:50, Tony <ei8jk@o2.ie>= wrote:
Hello=20 group.

Has anyone any experience with this SDR ?
It look= s=20 interesting and I'm a bit tempted, especially as it works full spe= c down to=20 500 Hz and "usable" to 100 Hz.
But as I have never used an SDR,= I haven't=20 got a clue if it's any good or not.



Eingehende eMail ist virenfrei.
Von AVG =FCberpr=FCft= - www.avg.de=20
Version: 9.0.864 / Virendatenbank: 271.1.1/3225 - Ausgabedatum:= 10/28/10=20 20:34:00
------=_NextPart_000_03FC_01CB782F.86E17670--