Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dl03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3619138000082; Mon, 1 Oct 2012 20:32:45 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TIqOE-0006gx-6a for rs_out_1@blacksheep.org; Tue, 02 Oct 2012 01:31:10 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TIqOD-0006go-9g for rsgb_lf_group@blacksheep.org; Tue, 02 Oct 2012 01:31:09 +0100 Received: from blu0-omc1-s4.blu0.hotmail.com ([65.55.116.15]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TIqOA-0001kT-V0 for rsgb_lf_group@blacksheep.org; Tue, 02 Oct 2012 01:31:08 +0100 Received: from BLU153-W24 ([65.55.116.7]) by blu0-omc1-s4.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Mon, 1 Oct 2012 17:31:03 -0700 Message-ID: X-Originating-IP: [136.226.254.42] From: Laurence KL7UK To: "rsgb_lf_group@blacksheep.org" Date: Mon, 1 Oct 2012 16:31:03 -0800 Importance: Normal MIME-Version: 1.0 X-OriginalArrivalTime: 02 Oct 2012 00:31:03.0813 (UTC) FILETIME=[34800B50:01CDA035] 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: Looking for a bit of assistance. Ive modded my TS850 to allow LF/MF transmit from info from http://we0h.us/Amateur_Radio_stuff/TS850/ts_850_lf_tx_mod.pdf (thanks Mike, original by Bob ZL2CA) but the "supplemental" parallel capacitor value in uF to increase the LF level isnt mentioned. Ive actually tried another 0.01 and smaller and higher values but at 137kHz it doesnt appear to increase the level - any takers or experiences out there who have modded the beast? We had a load of snow here at the weekend but thankfully its gone already and Im in the garden pulling up new ropes into 2 Spruce trees - a bit stronger than the bendy Birch and Ill attempt to pull up the loop this week. The loop will be slightly bigger, about 50m in length and slightly higher than WD2XDW in Bartlesville. We will see. COnditions are lousy at LF and MF given the Geo/Mag at this latitude but I was hearing Eu on 20m over the Pole pre dawn. We lose nearly 6 mins of sun per day at this time of year.... Laurence KL1X "The TS-850 transmit drive to the transverter port is reasonably broadband as manufactured, and passes some LF energy for amplification using an external LF amplifier. It is difficult to modify the TS-850 circuitry to decrease the LF droop without impacting on response at other HF bands. One modification to improve low frequency response is to supplement the value of C219 (a 0.01 uF capacitor, located near L88). It is possible to solder a parallel capacitor to the top side of the RF Unit PCB. Otherwise the "broadband" circuits in the TS-850 transmit drive are accepted for what they are. With C219 supplemented in value, 180 kHz output from IF OUT 1 is between about 100 and 250 millivolts, whereas on HF it is more like 1 volt." [...] 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 [65.55.116.15 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: 69d86b33142413363dd56bd312139bf4 Content-Type: multipart/alternative; boundary="_c3cff8f6-d644-439e-9e84-22f204248fe6_" Subject: LF: LF/MF modification of TS850 for LF 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: 3039ac1d4ad1506a362d0b6e X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --_c3cff8f6-d644-439e-9e84-22f204248fe6_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Looking for a bit of assistance. Ive modded my TS850 to allow LF/MF transm= it from info from http://we0h.us/Amateur_Radio_stuff/TS850/ts_850_lf_tx_mo= d.pdf (thanks Mike=2C original by Bob ZL2CA) but the "supplemental" paral= lel capacitor value in uF to increase the LF level isnt mentioned. Ive act= ually tried another 0.01 and smaller and higher values but at 137kHz it doe= snt appear to increase the level - any takers or experiences out there who = have modded the beast? We had a load of snow here at the weekend but thank= fully its gone already and Im in the garden pulling up new ropes into 2 Spr= uce trees - a bit stronger than the bendy Birch and Ill attempt to pull up = the loop this week. The loop will be slightly bigger=2C about 50m in length= and slightly higher than WD2XDW in Bartlesville. We will see. COnditions a= re lousy at LF and MF given the Geo/Mag at this latitude but I was hearing = Eu on 20m over the Pole pre dawn. We lose nearly 6 mins of sun per day at t= his time of year.... Laurence KL1X "The TS-850 transmit drive to the tran= sverter port is reasonably broadband as manufactured=2C and passes some LF energy for amplification using an external LF amplifier. It is diff= icult to modify the TS-850 circuitry to decrease the LF droop without impacting on response at other H= F bands. One modification to improve low frequency response is to supplement the value of C219 (a 0.0= 1 uF capacitor=2C located near L88). It is possible to solder a parallel capacitor to the top side of= the RF Unit PCB. Otherwise the "broadband" circuits in the TS-850 transmit drive are accepted for what= they are. With C219 supplemented in value=2C 180 kHz output from IF OUT 1 is between about 100 = and 250 millivolts=2C whereas on HF it is more like 1 volt." = --_c3cff8f6-d644-439e-9e84-22f204248fe6_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Looking for a bit of assistance.
 =3B
 =3BIve modded my T= S850 to allow LF/MF transmit from info from =3B http://we0h.us/Amateur_R= adio_stuff/TS850/ts_850_lf_tx_mod.pdf =3B (thanks Mike=2C original = by Bob =3BZL2CA)  =3Bbut the "supplemental" =3Bparallel =3B= capacitor value in uF to increase the LF level isnt mentioned.
 =3B=
Ive actually tried another 0.01 and smaller and higher values but at 13= 7kHz it doesnt appear to increase the level - any takers or experiences out= there who have modded the beast?
 =3B
We had a load of snow her= e at the weekend but thankfully its gone already and Im in the garden pulli= ng up new ropes into 2 Spruce trees - a bit stronger than the bendy Birch a= nd Ill attempt to pull up the loop this week. The loop will be slightly big= ger=2C about 50m in length and slightly higher than WD2XDW in Bartlesville.= We will see. COnditions are lousy at LF and MF given the Geo/Mag at this l= atitude but I was hearing Eu on 20m over the Pole pre dawn. We lose nearly = 6 mins of sun per day at this time of year....
 =3B
Laurence KL1X=
 =3B
 =3B
 =3B
"The TS-850 transmit drive to the transverter port is reaso= nably broadband as manufactured=2C and passes


some LF energy for amplification using an external LF= amplifier. It is difficult to modify the TS-850


circuitry to decrease the LF droop without impacting = on response at other HF bands. One modification


to improve low frequency response is to supplement th= e value of C219 (a 0.01 uF capacitor=2C located


near L88). It is possible to solder a parallel capaci= tor to the top side of the RF Unit PCB. Otherwise


the "broadband" circuits in the TS-850 transmit drive= are accepted for what they are. With C219


supplemented in value=2C 180 kHz output from IF OUT 1= is between about 100 and 250 millivolts=2C


whereas on HF it is more like 1 volt."
= --_c3cff8f6-d644-439e-9e84-22f204248fe6_--