Return-Path: Received: from rly-db07.mx.aol.com (rly-db07.mail.aol.com [172.19.130.82]) by air-db05.mail.aol.com (v119.12) with ESMTP id MAILINDB053-ad6471657c5210; Wed, 17 Oct 2007 14:43:24 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-db07.mx.aol.com (v119.12) with ESMTP id MAILRELAYINDB074-ad6471657c5210; Wed, 17 Oct 2007 14:43:19 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1IiDql-0005KY-Ul for rs_out_1@blacksheep.org; Wed, 17 Oct 2007 19:42:35 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1IiDql-0005KP-FK for rsgb_lf_group@blacksheep.org; Wed, 17 Oct 2007 19:42:35 +0100 Received: from smtp811.mail.ird.yahoo.com ([217.146.188.71]) by relay3.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1IiDqi-0001tq-QN for rsgb_lf_group@blacksheep.org; Wed, 17 Oct 2007 19:42:35 +0100 Received: (qmail 28230 invoked from network); 17 Oct 2007 18:42:27 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btinternet.com; h=Received:X-YMail-OSG:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MIMEOLE; b=nQGBdkIA9L00LtfuMHghDKrxubCx3B4N/slgtod2m2orCODx2m8SdTrvNgP1rZ/Gg3UNOp5fndyxSUgM2DoTVJQxRjMJcVTrjhlvLQ+6xhDhYB5ZwLGY2NkAssITXUZo7sHk7FDmd1KIgCk6R65Lzv13b/5dVtorcTlqHIFSE+k= ; Received: from unknown (HELO Lark) (alan.melia@btinternet.com@81.131.47.87 with login) by smtp811.mail.ird.yahoo.com with SMTP; 17 Oct 2007 18:42:26 -0000 X-YMail-OSG: Lz0WabMVM1nO2fFXwwLNKQlLhycnXbuuy6RO_CbT7uAFsaqYas9NLWbqUxZU4jfqGiKeVaZbSw-- Message-ID: <002201c810ed$7fa3e480$0900a8c0@Lark> From: "Alan Melia" To: References: <101720071453.22380.471621E3000421690000576C22058861720B97010D0A020E06979D0E03@comcast.net> <001a01c810e7$91a48ff0$baccfc3e@g3kev> <4716534A.7080202@w1tag.com> Date: Wed, 17 Oct 2007 19:42:36 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: MFJ259B Content-Type: text/plain; charset="iso-8859-1" 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 : X-AOL-SCOLL-AUTHENTICATION: listenair ; SPF_822_from : Just a thought you could use the divide chip as a DAC and generate a stepwise sinewave and then filter ?? Alan G3NYK ----- Original Message ----- From: "John Andrews" To: Sent: Wednesday, October 17, 2007 7:24 PM Subject: Re: LF: MFJ259B > Mal, > > The harmonic content of a divider's rectangular waveform would be a > problem for the wideband detector circuitry in the analyzer. The > waveform is typically not an issue for a classic bridge with a receiver > for a detector, as the harmonics are ignored. > > If you could incorporate a good low pass filter to take out the third > harmonic and above, then your idea should work. > > John A. > > hamilton mal wrote: > > Tnx Warren for the prompt reply and also all the others that responded, much > > appreciated. > > One approach that I had in mind was an outboard bit of hardware like a > > divider that fed the ant socket of the mfj 259 b and for instance use the > > 4 - 10 mhz range, divide by 10 to give 400 - 1000 khz (500 khz band). Has > > anyone seen a cct along these lines. >