Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mc01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 6A7CF380000A8; Thu, 5 Jul 2012 17:28:19 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SmtaM-000307-M7 for rs_out_1@blacksheep.org; Thu, 05 Jul 2012 22:27:38 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SmtaM-0002zv-5S for rsgb_lf_group@blacksheep.org; Thu, 05 Jul 2012 22:27:38 +0100 Received: from smtpout3.wanadoo.co.uk ([80.12.242.59] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1SmtaJ-0000N7-Qk for rsgb_lf_group@blacksheep.org; Thu, 05 Jul 2012 22:27:37 +0100 Received: from AGB ([2.26.14.221]) by mwinf5d39 with ME id WlTX1j00D4m9rMe03lTYJ6; Thu, 05 Jul 2012 23:27:34 +0200 Message-ID: From: "Graham" To: References: <7E7DFBB4D102A04DB5ADC88D66628A4A0FAB99CC@ICTS-S-MBX5.luna.kuleuven.be> <1SmrFA-199XcW0@fwd21.t-online.de>, <4FF5EB68.9040507@iup.uni-heidelberg.de> In-Reply-To: Date: Thu, 5 Jul 2012 22:27:31 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Spam-Score: 0.0 (/) 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: I would say the most useful thing to make would be a linear transmit HF > 500 convertor .. then all modes are possible , this is not 137 , ultra stable long qrss will not work , due to the short qsb and varying skip distance, this can be observed in qso or beacon mode , propagation will fail before the call is sent ! [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.59 listed in list.dnswl.org] 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 9af9bda535a078107136d2385fe00312 Subject: Re: Aw: Re: LF: RE: Analog oscillators Content-Type: multipart/alternative; boundary="----=_NextPart_000_0089_01CD5AFD.5E2A2B20" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.0 required=5.0 tests=HTML_30_40,HTML_MESSAGE, HTML_TAG_EXISTS_TBODY,MISSING_OUTLOOK_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: 0:2:482643584:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d60494ff606f304f9 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_0089_01CD5AFD.5E2A2B20 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable I would say the most useful thing to make would be a linear = transmit HF > 500 convertor .. then all modes are possible , = this is not 137 , ultra stable long qrss will not work , due to = the short qsb and varying skip distance, this can be observed in = qso or beacon mode , propagation will fail before the call is = sent ! G..=20 From: Hans-Albrecht Haffa=20 Sent: Thursday, July 05, 2012 9:16 PM To: rsgb_lf_group@blacksheep.org=20 Subject: Aw: Re: LF: RE: Analog oscillators 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.=20 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=20 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 > >=20 > =20 Ihr WEB.DE Postfach immer dabei: die kostenlose WEB.DE Mail App = f=C3=BCr iPhone und Android. =20 https://produkte.web.de/freemail_mobile_startseite/=20 ------=_NextPart_000_0089_01CD5AFD.5E2A2B20 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
I would  say  the most useful thing  to  = make =20 would  be a linear  transmit   HF > = 500  =20 convertor .. then  all  modes are  possible ,  = this  is=20 not  137 , ultra stable  long qrss  will  not  = work ,=20 due to the  short  qsb  and  varying   = skip =20 distance, this can be observed  in qso  or beacon  mode , = propagation  will  fail before the  call  is  = sent=20 !
 
G.. 

Sent: Thursday, July 05, 2012 9:16 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: Aw: Re: LF: RE: Analog = oscillators


Dear Stefan,
building stable oscillators was a topic in the eighties, and it = depeded all=20 on getting stable components. Later developing OMs reported, that the = oscillator=20 for the qrp-TRX was the most difficult and time consuming part in = development.=20 My recomendation: Buy aready built up DDS-oscillator, available at=20 Funkamateur.de  (herre with IQ-sigs) or ELV-Elektronik.  It is = stable,=20 shows  little noise on LF/MF. Must just be built into a = enclosure.  It=20 is a time saving solution. But: DFCW is not possible, and a keyed = frequency=20 divider  must be added; I divide by factor ten with CMOS-ICs.  = More=20 details on request.
55, Hans-Albrecht, DK 8 ND


Gesendet: Donnerstag, = 05. Juli=20 2012 um 21:30 Uhr
Von: "Stefan Sch=C3=A4fer"=20 <Stefan.Schaefer@iup.uni-heidelberg.de>
An: rsgb_lf_= group@blacksheep.org
Betreff: Re:=20 LF: RE: Analog oscillators
Hello Ha-Jo,

Can you pull one of the = xtals to=20 cover the whole band?

73, Stefan

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



  

Ihr=20 WEB.DE Postfach immer dabei: die kostenlose WEB.DE Mail App = f=C3=BCr iPhone und=20 Android.   
https://p= rodukte.web.de/freemail_mobile_startseite/ ------=_NextPart_000_0089_01CD5AFD.5E2A2B20--