Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 67DF538000092; Thu, 5 Jul 2012 16:17:55 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SmsTu-0002RN-Uq for rs_out_1@blacksheep.org; Thu, 05 Jul 2012 21:16:54 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SmsTu-0002RE-8b for rsgb_lf_group@blacksheep.org; Thu, 05 Jul 2012 21:16:54 +0100 Received: from fmmailgate01.web.de ([217.72.192.221]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1SmsTs-0008WR-JG for rsgb_lf_group@blacksheep.org; Thu, 05 Jul 2012 21:16:53 +0100 Received: from 3capp-webde-bs35.dlan.cinetic.de ( [172.19.170.35]) by fmmailgate01.web.de (Postfix) with ESMTP id 925B51AF49324 for ; Thu, 5 Jul 2012 22:16:51 +0200 (CEST) Received: from [91.11.125.43] by 3capp-webde-bs35 with HTTP; Thu Jul 05 22:16:51 CEST 2012 MIME-Version: 1.0 Message-ID: From: "Hans-Albrecht Haffa" To: rsgb_lf_group@blacksheep.org Date: Thu, 5 Jul 2012 22:16:51 +0200 (CEST) In-Reply-To: <4FF5EB68.9040507@iup.uni-heidelberg.de> References: <7E7DFBB4D102A04DB5ADC88D66628A4A0FAB99CC@ICTS-S-MBX5.luna.kuleuven.be> <1SmrFA-199XcW0@fwd21.t-online.de>, <4FF5EB68.9040507@iup.uni-heidelberg.de> Importance: normal Sensitivity: Normal X-UI-Message-Type: mail X-Priority: 3 X-Provags-ID: V01U2FsdGVkX19bK5NiX0N7+bjKGd0mf+B01vkNl5UqxURafXHG1uFzP43bOMrQ//mf 5uHLZL7/Q69UcEvvnvgs23rcL3d8r4j+w2IzzAwpOFvu3Kfl7kNyjQ== X-Spam-Score: 1.1 (+) 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: Dear Stefan, building stable oscillators was a topic in the eighties, and it depeded all on getting stable components. Later developing OMs reported, that the oscillator for the qrp-TRX was the most difficult and time consuming part in development. My recomendation: Buy aready built up DDS-oscillator, available at Funkamateur.de (herre with IQ-sigs) or ELV-Elektronik. It is stable, shows little noise on LF/MF. Must just be built into a enclosure. It is a time saving solution. But: DFCW is not possible, and a keyed frequency divider must be added; I divide by factor ten with CMOS-ICs. More details on request. [...] Content analysis details: (1.1 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [217.72.192.221 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dk8nd[at]web.de) -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message 1.1 MIME_HTML_ONLY BODY: Message only has text/html MIME parts X-Scan-Signature: 739d4fb39bd02fc5a2de5437a39bb056 Subject: Aw: Re: LF: RE: Analog oscillators Content-Type: text/html; charset=UTF-8 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=1.7 required=5.0 tests=HTML_30_40,HTML_MESSAGE, MIME_HTML_ONLY,PRIORITY_NO_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-SCOLL-SCORE: 0:2:477407904:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1db4084ff5f6720f50 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none

Dear Stefan,
building stable oscillators was a topic in the eighties, and it depeded all on getting stable components. Later developing OMs reported, that the oscillator for the qrp-TRX was the most difficult and time consuming part in development. My recomendation: Buy aready built up DDS-oscillator, available at Funkamateur.de  (herre with IQ-sigs) or ELV-Elektronik.  It is stable, shows  little noise on LF/MF. Must just be built into a enclosure.  It is a time saving solution. But: DFCW is not possible, and a keyed frequency divider  must be added; I divide by factor ten with CMOS-ICs.  More details on request.
55, Hans-Albrecht, DK 8 ND


Gesendet: Donnerstag, 05. Juli 2012 um 21:30 Uhr
Von: "Stefan Schäfer" <Stefan.Schaefer@iup.uni-heidelberg.de>
An: rsgb_lf_group@blacksheep.org
Betreff: Re: LF: RE: Analog oscillators
Hello Ha-Jo,

Can you pull one of the xtals to cover the whole band?

73, Stefan

Am 05.07.2012 20:57, schrieb hajo.brandt.dj1zb@t-online.de:
> Dear all,
>
> the only parts I have bought so far for MF (still beeing engaged in
> other developments) are two crystals: 6,5536 MHz and 7,0200 MHz, to be
> mixed with each other. The mixer is another bipolar transistor, and its
> emitter current is being keyed. A final source follower after the
> low-pass filter will deliver the output to 50 ohms.
>
> The same solution I have also used on LF.
>
> 73 Ha-Jo, DJ1ZB
>
>
>



  

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