Return-Path: Received: from rly-ma07.mx.aol.com (rly-ma07.mail.aol.com [172.20.116.51]) by air-ma02.mail.aol.com (v121.4) with ESMTP id MAILINMA021-8be478e8018170; Wed, 16 Jan 2008 17:07:44 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-ma07.mx.aol.com (v121.4) with ESMTP id MAILRELAYINMA078-8be478e8018170; Wed, 16 Jan 2008 17:07:22 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1JFGP0-0006ZR-9R for rs_out_1@blacksheep.org; Wed, 16 Jan 2008 22:06:30 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1JFGOz-0006ZI-Lx for rsgb_lf_group@blacksheep.org; Wed, 16 Jan 2008 22:06:29 +0000 Received: from pne-smtpout1-sn1.fre.skanova.net ([81.228.11.98]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1JFGOw-0000TE-1t for rsgb_lf_group@blacksheep.org; Wed, 16 Jan 2008 22:06:29 +0000 Received: from [127.0.0.1] (62.20.250.132) by pne-smtpout1-sn1.fre.skanova.net (7.3.129) (authenticated as u33233109) id 478CBB6300080255 for rsgb_lf_group@blacksheep.org; Wed, 16 Jan 2008 23:06:07 +0100 Message-ID: <478E7FDC.6080508@telia.com> Date: Wed, 16 Jan 2008 23:06:20 +0100 From: "Johan H. Bodin" User-Agent: Thunderbird 2.0.0.9 (Windows/20071031) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <88d2415e0801160551q12905110v3611d374f38a6963@mail.gmail.com> In-Reply-To: <88d2415e0801160551q12905110v3611d374f38a6963@mail.gmail.com> X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: LF Receiver Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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 : n X-Mailer: Unknown (No Version) Laurie, lawrence mayhead wrote: > So that leaves SDR receivers like the Perseus, thanks Johan, > but these are digital, can the AGC be turned off? Yes, at least on Perseus. It has a dedicated "AGC OFF" button. > and another problem if my computer sound card is tied up > processing I/Q signals can it also do the FFT analysis ? at > the same time. Perseus uses the computer's default soundcard only for audio output (for listening). High speed USB 2.0 is used to transfer the digital I/Q signal from Perseus to the PC, up to 500ksps => max 400kHz panoramic display. With an additional VAC program (Virtual Audio Cable), the audio output can be routed (digitally - without any loss of quality) to any software that expects an input signal from a soundcard (Argo etc). Perseus is the "cleanest" receiver I have ever seen/heard! Only a few very weak spurs and an exceptionally clean LO (or rather ADC clock). The LO "noise trumpet" is very narrow and the noise, measured with a crystal oscillator, is about -142dBc/Hz at 2kHz offset. Unfortunately, the receiver has no input for external frequency reference. This may be a problem for the QRSS120 guys? Anyway, the radio appears to be very stable. (I am not affiliated with the Peresus manufacturer in any way, just a very satisfied owner). Winrad supports Perseus, and it works very well. It can be used instead of the supplied Perseus software, however, Winrad does not have an "AGC OFF" button (yet) but since... ...Alberto di Bene wrote: > in case it is not implemented, just ask the author of the program... this problem can be considered already solved. Hi hi... :-) 73 Johan SM6LKM