Return-Path: Received: (qmail 19499 invoked from network); 22 Feb 2001 08:44:16 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by extortion.plus.net with SMTP; 22 Feb 2001 08:44:16 -0000 Received: (qmail 27332 invoked from network); 22 Feb 2001 08:44:17 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 22 Feb 2001 08:44:17 -0000 Content-Transfer-Encoding: 8bit Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14VrGy-00035d-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 22 Feb 2001 08:38:48 +0000 Received: from bob.dera.gov.uk ([192.5.29.90]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14VrGx-00035Y-00 for rsgb_lf_group@blacksheep.org; Thu, 22 Feb 2001 08:38:47 +0000 X-Priority: 3 X-MSMail-Priority: Normal Received: by bob.dera.gov.uk; (8.8.8/1.3/10May95) id IAA20011; Thu, 22 Feb 2001 08:40:36 GMT Received: (qmail 7788 invoked from network); 22 Feb 2001 09:30:51 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from gauntlet.mail.dera.gov.uk (172.16.9.10) by baton.dera.gov.uk with SMTP; 22 Feb 2001 09:30:51 -0000 Received: by gauntlet.mail.dera.gov.uk; id JAA06256; Thu, 22 Feb 2001 09:19:47 GMT Received: from unknown(10.71.64.31) by gauntlet.mail.dera.gov.uk via smap (3.2) id xma006233; Thu, 22 Feb 01 09:19:24 GMT Received: from FRN-MAIL-3.dera.gov.uk (unverified) by mailguard.dera.gov.uk (Content Technologies SMTPRS 4.1.5) with ESMTP id for ; Thu, 22 Feb 2001 08:42:34 +0000 Received: by frn-mail-3.dera.gov.uk with Internet Mail Service (5.5.2650.21) id ; Thu, 22 Feb 2001 08:37:55 -0000 Message-ID: <65AECDF1F89AD411900400508BFC869F0D75DF@pdw-mail-1.dera.gov.uk> From: "Talbot Andrew" To: rsgb_lf_group@blacksheep.org Subject: LF: RE: TECH: LF Converters Date: Thu, 22 Feb 2001 08:38:08 -0000 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Content-Type: text/plain; charset=iso-8859-1; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Remember to terminate the IF low freqeuncy port and a least one of the others with something close to 50 ohms at BOTH wanted and image frequencies if you want to preserve the full dynamic range and strong signal handling these are capable of. Use a diplexer filter if necessary to terminate properly at both frequencies Andy G4JNT > -----Original Message----- > From: PY3CRX PY2PLL [mailto:py2pll@py.qsl.br] > Sent: 2001-02-21 15:30 > To: LF Group > Subject: LF: TECH: LF Converters > > > Hi ... > > I've been using a MC1496 as a mixer and decided to try those SBLs from > Minicircuits. But the models that cover down to few KHz are > quite expensive > and not available here. > > Re-reading the Minicircuits book I have (from 1993, 700 pages > or so) they > say that for some applications we can use the SIG port as > output and the the > IF port as input when we need to "receive from DC to several MHz". > > This is the case below 500KHz for cheap SBL1, SRA1, etc or > even to an high > intercept home made DDBM. The isolation remains more or less > the same, so > the SWR. > > I checked this inverting feature on SBL1, SRA1 and TFM2. All > units gave the > same insertion loss (6.5dB) and produced the same LO > attenuation at receiver > input (-45dBc). I use a MAV11 as post amp. > > The performance actually is better than the MC1496 bug (less > noise) and 82Hz > ZEVS signal still there, so the regular utilities on 16K, > 18k2, 18k3, 19k8, > 21k4, 24k0 ... and some new ones between 50K and 100K > yesterday (rtty/msk). > > 73 > Marcus > PY3CRX/PY2PLL > S. B. do Campo - GG66rf > http://py.qsl.br > Active from "DC" to 24GHz > > > -- The Information contained in this E-Mail and any subsequent correspondence is private and is intended solely for the intended recipient(s). For those other than the recipient any disclosure, copying, distribution, or any action taken or omitted to be taken in reliance on such information is prohibited and may be unlawful.