Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 673C0380000AE; Tue, 2 Oct 2012 19:28:31 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TJBs1-0000yy-2K for rs_out_1@blacksheep.org; Wed, 03 Oct 2012 00:27:21 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TJBs0-0000yp-4a for rsgb_lf_group@blacksheep.org; Wed, 03 Oct 2012 00:27:20 +0100 Received: from blu0-omc1-s10.blu0.hotmail.com ([65.55.116.21]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TJBrx-0006s9-Ny for rsgb_lf_group@blacksheep.org; Wed, 03 Oct 2012 00:27:19 +0100 Received: from BLU153-W40 ([65.55.116.9]) by blu0-omc1-s10.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Tue, 2 Oct 2012 16:27:14 -0700 Message-ID: X-Originating-IP: [136.226.254.42] From: Laurence KL7UK To: "rsgb_lf_group@blacksheep.org" Date: Tue, 2 Oct 2012 15:27:14 -0800 Importance: Normal In-Reply-To: <506B61B0.7080501@iup.uni-heidelberg.de> References: ,<506A399A.2070800@iup.uni-heidelberg.de>,,<506B61B0.7080501@iup.uni-heidelberg.de> MIME-Version: 1.0 X-OriginalArrivalTime: 02 Oct 2012 23:27:14.0980 (UTC) FILETIME=[74C03E40:01CDA0F5] X-Spam-Score: -2.1 (--) 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: 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. [...] Content analysis details: (-2.1 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [65.55.116.21 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (hellozerohellozero[at]hotmail.com) -0.0 SPF_PASS SPF: sender matches SPF record -2.1 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: b16f5c37bc0c21b41453c2ac5e65973c Content-Type: multipart/alternative; boundary="_d23aaf39-8b68-411d-a5fc-740fcf39a249_" Subject: Was Strefans/G LF: LF/MF modification of TS850 for LF and band conditions 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=FORGED_HOTMAIL_RCVD, HTML_MESSAGE,TO_ADDRESS_EQ_REAL 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: 3039ac1d618a506b789e4551 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --_d23aaf39-8b68-411d-a5fc-740fcf39a249_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 c= ircuit 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 pla= y pretty easily and try a few things. Changing the drive routing and termin= ation Z will also have an effect which Ill investigate Ill do some more che= cking=2C but what is evident is that as the RX is dang hot at LF/MF its goi= ng to be a pretty good addition to the portfolio. Im presently building a 2= X drive source from the 10MHz ref which will replace the internal ref osc i= n 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 ye= ar though we have new noisy neighbors but using Cardoid or Mults/Beverage I= think we are going to do fine. Ive never got a signal to Eu from here (I = cant recall ever being heard further than the poor East coast USA route)=2C= but I reckon that its going to do pretty well into VK and ZL and Eu on goo= d 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 estima= ted but is derived from real time survey coverage from the WD2XDW loop in O= klahoma 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 With all= these nearby mountains the signal get bounced around in any case so will s= ee what empircally turns sup. (sic) Havnet heard the 510kHz Fairbanks NDB = yet this autumn... Laurence KL1XWasilla AK =20 Date: Tue=2C 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 =20 Hi Laurence=2C=20 Am 02.10.2012 23:20=2C 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=2C so I can see perhaps why this C219 could be increased to reduce LF losses=2C 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. =20 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... =20 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. =20 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 =3B-) 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=2C now confirming > 50 dB att. in 2 kHz outside the passband!=20 73=2C Stefan/DK7FC = --_d23aaf39-8b68-411d-a5fc-740fcf39a249_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Very good chaps =3B- =3Byes the trick is to stay a= way from some resonaces and get others! If it were soley for LF MF =3BI= d go in hard and change that out put circuit but dont want to cripple the H= F side as I can still use it as a true transverter too - as =3BL89 is a= ccessible 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 =3Bhave = an effect which Ill investigate
 =3B
Ill do some more checking=2C but what is evident is that as the R= X is dang hot at LF/MF its going to be a pretty =3Bgood addition to the= portfolio. Im presently building a 2X =3Bdrive source from the 10MHz r= ef which will replace the internal =3Bref osc in the =3B850 and loc= k it down - I got the "kit" off Ebay but Im a little shaky with the solderi= ng iron nowadays so Ill see how I do with this SM stuff.
 =3B
Ove= r the pole - well Im someways in a =3Bmuch better position s/n wise thi= s year =3Bthough we have new noisy neighbors but using Cardoid or Mults= /Beverage I think we are going to do =3Bfine.
&n= bsp=3B
Ive never got a signal to Eu from here (I cant= recall ever being heard further than the poor East coast USA route)=2C but= I reckon =3Bthat its going to =3Bdo pretty well into VK and ZL and= Eu on good N Polar days (rarer this year no doubt) =3B but some ( alot= ) =3Bof the USA will be in a null http://kl7uk.com/lobes.png =3B - the appx -6dB =3Bpattern is = estimated but =3Bis derived from real =3Btime survey coverage from = the WD2XDW loop =3Bin Oklahoma taken at 7 mile radii back a few years&n= bsp=3Bago =3B - very rough and ready version as I drove with GPS = =3B =3Bhere =3B http://kl= 7uk.com/XDWpolar.png =3B
 =3B
With all these nearby mountains the signal get bounced around i= n any case so will =3Bsee what empircally turns sup. (sic) =3B Havn= et heard the =3B510kHz Fairbanks NDB yet this autumn...
 =3B
Laurence KL1X
Wasilla AK
 =3B
Date: Tue=2C 2 Oct 2012 23:50:40 +0200=
From: Stefan.Schaefer@iup.uni-heidelberg.de
To: rsgb_lf_group@blacks= heep.org
Subject: Re: Strefans LF: LF/MF modification of TS850 for LF
=20 Hi Laurence=2C

Am 02.10.2012 23:20=2C schrieb Laurence KL7UK:
h= ttp://kl7uk.com/850.png
 =3B
Stefan - heres the part of the circuit concerned =3B- its the coupling after the 3rd mixer - so its at TX base band frequency=2C so I can see =3Bperhaps why this C219 could be increased to reduce LF losses=2C = but not a lot me thinks as the reactance to "Earth" =3Bis 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...


 =3B
Still very poor LF and MF - nearly no signals from Siberia/Mongolia on LF - still =3Bat 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 =3B-) 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=2C now confirming >=3B 50 dB att. in 2 kHz outside the passband!

73=2C Stefan/DK7FC
= --_d23aaf39-8b68-411d-a5fc-740fcf39a249_--