Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-df02.r1000.mx.aol.com (Internet Inbound) with ESMTP id D457738000088; Wed, 3 Oct 2012 04:24:00 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TJKDk-0001Sr-DW for rs_out_1@blacksheep.org; Wed, 03 Oct 2012 09:22:20 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TJKDj-0001Si-H6 for rsgb_lf_group@blacksheep.org; Wed, 03 Oct 2012 09:22:19 +0100 Received: from out1.ip04ir2.opaltelecom.net ([62.24.128.240]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TJKDg-0007xI-Hw for rsgb_lf_group@blacksheep.org; Wed, 03 Oct 2012 09:22:18 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AssKAODda1BcHndj/2dsb2JhbABFgkuqHYkeAYdYA4EOgQmCGwUBAQUIAQEDCz4CLAEBAwUCAQMRAwEBAQolFAEEGgYWCAYTCgECAgEBCIdaAxO4Loo/ZGoDJIUpA4gjhUaGLIJpigsDhQiCZw X-IronPort-AV: E=Sophos;i="4.80,527,1344207600"; d="scan'208,217";a="386377972" Received: from host-92-30-119-99.as13285.net (HELO xphd97xgq27nyf) ([92.30.119.99]) by out1.ip04ir2.opaltelecom.net with SMTP; 03 Oct 2012 09:22:12 +0100 Message-ID: <002901cda140$2d3e2a00$0501a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: ,<506A399A.2070800@iup.uni-heidelberg.de>,,<506B61B0.7080501@iup.uni-heidelberg.de> Date: Wed, 3 Oct 2012 08:22:06 -0000 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 X-Spam-Score: 4.4 (++++) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. 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Content preview: Laurance I never had any problem working KL7 on 160 metres in the past and if there was anyone available I would like to try 500 Khz sometime for a two way QSO de mal/g3kev ----- Original Message ----- From: Laurence KL7UK To: rsgb_lf_group@blacksheep.org Sent: Tuesday, October 02, 2012 11:27 PM Subject: Was Strefans/G LF: LF/MF modification of TS850 for LF and band conditions [...] Content analysis details: (4.4 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [62.24.128.240 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 4.4 AXB_XMAILER_MIMEOLE_OL_024C2 AXB_XMAILER_MIMEOLE_OL_024C2 X-Scan-Signature: 4b1739ed9f8a5c36a1958dbdf5306bf7 Subject: Re: Was Strefans/G LF: LF/MF modification of TS850 for LF and band conditions Content-Type: multipart/alternative; boundary="----=_NextPart_000_0026_01CDA140.2CE5D0D0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE 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-sid: 3039ac1d40d6506bf6202fc0 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_0026_01CDA140.2CE5D0D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Laurance I never had any problem working KL7 on 160 metres in the past and if = there was anyone available I would like to try 500 Khz sometime for a two way QSO de mal/g3kev ----- Original Message -----=20 From: Laurence KL7UK=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, October 02, 2012 11:27 PM Subject: Was Strefans/G LF: LF/MF modification of TS850 for LF and = band conditions Very good chaps - yes the trick is to stay away from some resonaces = and get others! If it were soley for LF MF Id go in hard and change that = out put circuit but dont want to cripple the HF side as I can still use = it as a true transverter too - as L89 is accessible from the top of the = board I can play pretty easily and try a few things. Changing the drive = routing and termination Z will also have an effect which Ill investigate Ill do some more checking, but what is evident is that as the RX is = dang hot at LF/MF its going to be a pretty good addition to the = portfolio. Im presently building a 2X drive source from the 10MHz ref = which will replace the internal ref osc in the 850 and lock it down - I = got the "kit" off Ebay but Im a little shaky with the soldering iron = nowadays so Ill see how I do with this SM stuff. =20 Over the pole - well Im someways in a much better position s/n wise = this year though we have new noisy neighbors but using Cardoid or = Mults/Beverage I think we are going to do fine.=20 Ive never got a signal to Eu from here (I cant recall ever being heard = further than the poor East coast USA route), but I reckon that its going = to do pretty well into VK and ZL and Eu on good N Polar days (rarer this = year no doubt) but some ( alot) of the USA will be in a null = http://kl7uk.com/lobes.png - the appx -6dB pattern is estimated but is = derived from real time survey coverage from the WD2XDW loop in Oklahoma = taken at 7 mile radii back a few years ago - very rough and ready = version as I drove with GPS here http://kl7uk.com/XDWpolar.png =20 With all these nearby mountains the signal get bounced around in any = case so will see what empircally turns sup. (sic) Havnet heard the = 510kHz Fairbanks NDB yet this autumn... Laurence KL1X Wasilla AK =20 -------------------------------------------------------------------------= ----- Date: Tue, 2 Oct 2012 23:50:40 +0200 From: Stefan.Schaefer@iup.uni-heidelberg.de To: rsgb_lf_group@blacksheep.org Subject: Re: Strefans LF: LF/MF modification of TS850 for LF Hi Laurence,=20 Am 02.10.2012 23:20, schrieb Laurence KL7UK:=20 http://kl7uk.com/850.png =20 Stefan - heres the part of the circuit concerned - its the coupling = after the 3rd mixer - so its at TX base band frequency, so I can see = perhaps why this C219 could be increased to reduce LF losses, but not a = lot me thinks as the reactance to "Earth" is pretty low at 137 - the aim = is to improve LF without mucking up the HF side so you can only go so = far. Maybe you can make a series resonance for LF by adding a L in series. = This L must have a C in parallel or a low self resonance frequency. My = first guess... At least a to high C across C219 will make a almost short cut for HF = to ground... Still very poor LF and MF - nearly no signals from Siberia/Mongolia = on LF - still at least the snow has stayed away. Loran was around 15dB = down from "average" last nite. Getting very dark in the mornings and a = Huge Male Moose ran into a car on the road into work this morning - both = car/driver and Moose didnt make it. R. Tell me when the band opens. BTW i'm 3...5 dB stronger since the = last success in december so we may play a lot more this year. Just played arround with a NE612 for the first time in my life ;-) = Quite useful IC! It became a 475 kHz transmit mixer (460 kHz LO) and is = used in combination with my mechanical filter which i use for MF RX as = well. Then applying white noise from the SpecLab SG i can see the = resonance curve again, now confirming > 50 dB att. in 2 kHz outside the = passband!=20 73, Stefan/DK7FC ------=_NextPart_000_0026_01CDA140.2CE5D0D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Laurance
I never had any problem working KL7 on = 160 metres=20 in the past and if there was anyone available I would like to try 500=20 Khz
sometime for a  two way = QSO
 
de mal/g3kev
 
 
----- Original Message -----
From:=20 Laurence KL7UK =
Sent: Tuesday, October 02, 2012 = 11:27=20 PM
Subject: Was Strefans/G LF: = LF/MF=20 modification of TS850 for LF and band conditions

Very good chaps - yes the trick is to stay = away from=20 some resonaces and get others! If it were soley for LF MF Id go = in hard=20 and change that out put circuit but dont want to cripple the HF side = as I can=20 still use it as a true transverter too - as L89 is accessible = from the=20 top of the board I can play pretty easily and try a few things. = Changing the=20 drive routing and termination Z will also have an effect which = Ill=20 investigate
 
Ill do some more checking, but what is evident is that = as the RX=20 is dang hot at LF/MF its going to be a pretty good addition to = the=20 portfolio. Im presently building a 2X drive source from the 10MHz = ref=20 which will replace the internal ref osc in the 850 and lock = it down=20 - I got the "kit" off Ebay but Im a little shaky with the soldering = iron=20 nowadays so Ill see how I do with this SM stuff.
 
Over the = pole -=20 well Im someways in a much better position s/n wise this = year though=20 we have new noisy neighbors but using Cardoid or Mults/Beverage I = think we are=20 going to do fine.
 
Ive never got a signal to Eu from here (I cant recall = ever being=20 heard further than the poor East coast USA route), but I = reckon that its=20 going to do pretty well into VK and ZL and Eu on good N Polar = days (rarer=20 this year no doubt)  but some ( alot) of the USA will be in = a null=20 http://kl7uk.com/lobes.png  = -=20 the appx -6dB pattern is estimated but is derived from=20 real time survey coverage from the WD2XDW loop in Oklahoma = taken at=20 7 mile radii back a few years ago  - very rough and ready = version as=20 I drove with GPS  here  http://kl7uk.com/XDWpolar.png&= nbsp;=20
 
With all these nearby mountains the signal get bounced = around in=20 any case so will see what empircally turns sup. (sic)  = Havnet heard=20 the 510kHz Fairbanks NDB yet this autumn...
 
Laurence KL1X
Wasilla AK
 
Date: Tue, 2 Oct 2012 23:50:40 +0200
From:=20 Stefan.Schaefer@iup.uni-heidelberg.de
To:=20 rsgb_lf_group@blacksheep.org
Subject: Re: Strefans LF: LF/MF = modification=20 of TS850 for LF

Hi Laurence,

Am 02.10.2012 23:20, = schrieb=20 Laurence KL7UK:=20
http://kl7uk.com/850.png
 
Stefan - = heres the=20 part of the circuit concerned - its the coupling after the 3rd = mixer -=20 so its at TX base band frequency, so I can see perhaps why this = C219=20 could be increased to reduce LF losses, but not a lot me thinks as = the=20 reactance to "Earth" is pretty low at 137 - the aim is to = improve LF=20 without mucking up the HF side so you can only go so=20 far.
Maybe you can make a series resonance for = LF by=20 adding a L in series. This L must have a C in parallel or a low self = resonance=20 frequency. My first guess...
At least a to high C across C219 will = make a=20 almost short cut for HF to ground...



Still very poor LF and MF - nearly no signals = from=20 Siberia/Mongolia on LF - still at least the snow has stayed = away. Loran=20 was around 15dB down from "average" last nite. Getting very dark in = the=20 mornings and a Huge Male Moose ran into a car on the road into work = this=20 morning - both car/driver and Moose didnt make = it.
R.=20 Tell me when the band opens. BTW i'm 3...5 dB stronger since the last = success=20 in december so we may play a lot more this year.


Just played arround with a NE612 for the = first time=20 in my life ;-) Quite useful IC! It became a 475 kHz transmit mixer = (460 kHz=20 LO) and is used in combination with my mechanical filter which = i use=20 for MF RX as well. Then applying white noise from the SpecLab SG i can = see the=20 resonance curve again, now confirming > 50 dB att. in 2 kHz outside = the=20 passband!

73, = Stefan/DK7FC
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