Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mg05.r1000.mx.aol.com (Internet Inbound) with ESMTP id EF537380000CC; Thu, 5 Jul 2012 16:43:39 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Smssl-0002Yz-QH for rs_out_1@blacksheep.org; Thu, 05 Jul 2012 21:42:35 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Smssl-0002Yq-79 for rsgb_lf_group@blacksheep.org; Thu, 05 Jul 2012 21:42:35 +0100 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1Smssi-00009v-Rd for rsgb_lf_group@blacksheep.org; Thu, 05 Jul 2012 21:42:34 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id q65KgVmu012893 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 5 Jul 2012 22:42:31 +0200 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id q65KgVc5028815 for ; Thu, 5 Jul 2012 22:42:31 +0200 Message-ID: <4FF5FBBE.4000604@iup.uni-heidelberg.de> Date: Thu, 05 Jul 2012 22:40:30 +0200 From: =?UTF-8?B?U3RlZmFuIFNjaMOkZmVy?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <7E7DFBB4D102A04DB5ADC88D66628A4A0FAB99CC@ICTS-S-MBX5.luna.kuleuven.be> <1SmrFA-199XcW0@fwd21.t-online.de>, <4FF5EB68.9040507@iup.uni-heidelberg.de> In-Reply-To: X-Spam-Score: -0.7 (/) 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: Hello Hans, I alreda y have a DDS from ELV, since several years. But this one has a sine output and needs a +- input volatge. So i added a DC/DC converter from 12V -> +-12V to the circuit. This DDS consumes 250 mA when running. Apart from that i want to build and run my own equipment, even if it is a bit less comfortable or has some restrictions e.g a mono-band RX instead of a wideband IQ RX like the Perseus. Another reason is the need to use 4x the frequency i want to transmit on because the PA has a /4 divider inside. So if i can have a very small oscillator that just covers 472 to 479 kHz (actually running on 4x that QRG) then this effect is compensated. [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [129.206.100.212 listed in list.dnswl.org] -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 7a302ec14fb4a62f16f049454b6dc54d Subject: Re: LF: RE: Analog oscillators Content-Type: multipart/alternative; boundary="------------060809000602090509070000" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_20_30,HTML_MESSAGE, HTML_TAG_EXISTS_TBODY 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: 0:2:464763392:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d60cd4ff5fc7b73b2 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. --------------060809000602090509070000 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by relay.uni-heidelberg.de id q65KgVmu012893 Hello Hans, I alreda y have a DDS from ELV, since several years. But this one has a=20 sine output and needs a +- input volatge. So i added a DC/DC converter=20 from 12V -> +-12V to the circuit. This DDS consumes 250 mA when running. Apart from that i want to build and run my own equipment, even if it is=20 a bit less comfortable or has some restrictions e.g a mono-band RX=20 instead of a wideband IQ RX like the Perseus. Another reason is the need to use 4x the frequency i want to transmit on=20 because the PA has a /4 divider inside. So if i can have a very small=20 oscillator that just covers 472 to 479 kHz (actually running on 4x that=20 QRG) then this effect is compensated. For the ELV DDS i added a circuit that allows DFCW operation, a logic=20 circuit that acts on the increment/decrement sensor. It works well,=20 although with some limitations. 73 and maybe AWDH this evening. 73, Stefan Am 05.07.2012 22:16, schrieb Hans-Albrecht Haffa: > > Dear Stefan, > building stable oscillators was a topic in the eighties, and it=20 > depeded all on getting stable components. Later developing OMs=20 > reported, that the oscillator for the qrp-TRX was the most difficult=20 > and time consuming part in development. My recomendation: Buy aready=20 > built up DDS-oscillator, available at Funkamateur.de (herre with=20 > IQ-sigs) or ELV-Elektronik. It is stable, shows little noise on=20 > LF/MF. Must just be built into a enclosure. It is a time saving=20 > solution. But: DFCW is not possible, and a keyed frequency divider =20 > must be added; I divide by factor ten with CMOS-ICs. More details on=20 > request. > 55, Hans-Albrecht, DK 8 ND > > > *Gesendet:* Donnerstag, 05. Juli 2012 um 21:30 Uhr > *Von:* "Stefan Sch=C3=A4fer" > *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 b= e > > mixed with each other. The mixer is another bipolar transistor, and i= ts > > 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 > > > > > > > > > > > > Ihr WEB.DE Postfach immer dabei: die kostenlose WEB.DE Mail App f=C3=BC= r=20 > iPhone und Android. > *https://produkte.web.de/freemail_mobile_startseite/* > --------------060809000602090509070000 Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by relay.uni-heidelberg.de id q65KgVmu012893 Hello Hans,

I alreda y have a DDS from ELV, since several years. But this one has a sine output and needs a +- input volatge. So i added a DC/DC converter from 12V -> +-12V to the circuit. This DDS consumes 250 mA when running.
Apart from that i want to build and run my own equipment, even if it is a bit less comfortable or has some restrictions e.g a mono-band RX instead of a wideband IQ RX like the Perseus.
Another reason is the need to use 4x the frequency i want to transmit on because the PA has a /4 divider inside. So if i can have a very small oscillator that just covers 472 to 479 kHz (actually running on 4x that QRG) then this effect is compensated.

For the ELV DDS i added a circuit that allows DFCW operation, a logic circuit that acts on the increment/decrement sensor. It works well, although with some limitations.

73 and maybe AWDH this evening.

73, Stefan


Am 05.07.2012 22:16, schrieb Hans-Albrecht Haffa:

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=C2=A0 (herre with IQ-sigs) or ELV-Elektronik.=C2=A0 It is stable, shows=C2=A0 little noise = on LF/MF. Must just be built into a enclosure.=C2=A0 It is a time saving solution. But: DFCW is not possible, and a keyed frequency divider=C2=A0 must be added; I divide by factor ten with CMOS-ICs.=C2=A0 More details o= n request.
55, Hans-Albrecht, DK 8 ND




=C2=A0=C2=A0

Ihr WEB.DE Postfach immer dabei: die kostenlose WEB.DE Mail App f=C3=BCr iPho= ne und Android.=C2=A0=C2=A0=C2=A0
https://= produkte.web.de/freemail_mobile_startseite/
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