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[195.171.43.25]) by mx.google.com with ESMTP id mb4si10743568wjb.92.2013.08.05.07.13.04 for ; Mon, 05 Aug 2013 07:13:05 -0700 (PDT) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org; dkim=pass header.i=@gmail.com Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1V6Kp6-0004Y3-5H for rs_out_1@blacksheep.org; Mon, 05 Aug 2013 14:27:44 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1V6Kp5-0004Xt-HU for rsgb_lf_group@blacksheep.org; Mon, 05 Aug 2013 14:27:43 +0100 Received: from mail-ob0-f173.google.com ([209.85.214.173]) by relay1.thorcom.net with esmtps (TLSv1:RC4-SHA:128) (Exim 4.77) (envelope-from ) id 1V6Kp3-0001H5-8D for rsgb_lf_group@blacksheep.org; Mon, 05 Aug 2013 14:27:42 +0100 Received: by mail-ob0-f173.google.com with SMTP id ta17so5464401obb.4 for ; Mon, 05 Aug 2013 06:27:39 -0700 (PDT) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=8Sy8mrZs4nQPkmLiG66n7eRZpAABxD2HrDQ4ubdvPec=; b=npDaFKcIfhNUAemKZ5xpX+wBFHxXNoNJ6T3EwMVzTblfY8HSk/R1w2PRuuHB54Dvdg o+z/zZI3w9suyuKiWHdRDAc+U/tUSlWMjv0KU5658+ra8k3e/CGkmP5fzInAy0noHaUI n2S42x7MZ0HF7ASL2tCMDYkVoheAtu5zzYhufDm9pTCSqaTehzHCHkpyVpccmodJO8xV sSXac3FPBqgkIhqAZl7UaToSzhs+lPlO7p1hoblHZ8oJpHdRmuzJDmEAPV0/UnJ5Ssnc YfHat58ubvZSCQWhOG9IP3YUeepyeOafYcXT6i3A2ZZy1T+Xeqju7ZaQ1y5VHyDbnc21 l4XA== MIME-Version: 1.0 X-Received: by 10.60.145.241 with SMTP id sx17mr14146397oeb.57.1375709259215; Mon, 05 Aug 2013 06:27:39 -0700 (PDT) Received: by 10.60.161.237 with HTTP; Mon, 5 Aug 2013 06:27:39 -0700 (PDT) In-Reply-To: References: <5B7EABE7E07E4CBA942ABD001F4587E3@malHP> Date: Mon, 5 Aug 2013 09:27:39 -0400 Message-ID: From: Warren Ziegler To: rsgb_lf_group 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: Mal, Many thanks for the info on the low bad Decca tanks! Does your handbook call out the specs for the guard circuit (link coil and capacitance)? 73 Warren On Mon, Aug 5, 2013 at 8:00 AM, mal hamilton wrote: [...] 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 [209.85.214.173 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (wd2xgj[at]gmail.com) -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 2f90a4c609af5ffc8bc1d07d55c0cce1 Subject: Re: LF: Re: Decca Experts - Converting Red to Purple ? Content-Type: multipart/alternative; boundary=047d7b5d474ab5badd04e333451f X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40, HTML_FONTCOLOR_UNSAFE,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 Status: O X-Status: X-Keywords: X-UID: 2760 --047d7b5d474ab5badd04e333451f Content-Type: text/plain; charset=ISO-8859-1 Mal, Many thanks for the info on the low bad Decca tanks! Does your handbook call out the specs for the guard circuit (link coil and capacitance)? 73 Warren On Mon, Aug 5, 2013 at 8:00 AM, mal hamilton wrote: > Hi Warren > Decca LOW BAND --------------inductor L reqd to resonate on 73 khz > ------------126.75 uH ie Total C in PA unit 37.5 nF plus 126.75 uH in > series ===== 73 Khz > High band versions do not have enough C in PA UNIT > 73 DE MAL/G3KEV > > > > *From:* Warren Ziegler > *Sent:* Monday, August 05, 2013 1:59 AM > *To:* rsgb_lf_group > *Subject:* Re: LF: Fw: Decca Experts - Converting Red to Purple ? > > Hi Mal, > > Many thanks for the e-mail! > I am looking for details on the tank circuit for the "Purple" Decca which > was on 70.8 kHz - either inductance or number of turns or capacitance. > Also, any details on the guard circuit for the 70kHz version - how many > turns on the link and capacitance. > I have an unconverted 112kHz unit, not sure if that is considered high > band or low band? > > I really appreciate your help! > > vy 73 Warren K2ORS > > > > On Sun, Aug 4, 2013 at 3:08 PM, mal hamilton wrote: > >> >> >> *From:* mal hamilton >> *Sent:* Sunday, August 04, 2013 7:59 PM >> *To:* rsgb_lf_group@blacksheep.org >> *Subject:* Re: LF: Decca Experts - Converting Red to Purple ? >> >> Warren >> I have all the original handbooks for the Decca 5501 range if you need >> specific info let me know. The low band versions have a different Capacitor >> board and are easy to mod for 73 Khz >> The higher band versions are not so convenient to mod for 73 but more >> suited to 136. >> I have 2 x 5501 units for the high band modified for 136 but fortunately >> I have 2 x C boards for the low band so I just need to modify the Coils >> for 73 if we got this band again >> I was active on 73 towards the end but by then nearly everyone had moved >> to 136 >> Most hams in the UK were using modified Audio amps on 73 and I do not >> recall anyone using the decca on that band at the time. Decca amps were not >> available in the early days of 73 >> Modes at the time were CW and QRSS >> mal/g3kev >> >> >> >> >> >> >> >> >> *From:* Warren Ziegler >> *Sent:* Sunday, August 04, 2013 1:28 AM >> *To:* rsgb_lf_group >> *Subject:* LF: Decca Experts - Converting Red to Purple ? >> >> Hello to all of the Decca Navigator experts out there... >> >> I have an unconverted Decca 5501 transmitter which is marked "Red" - >> I believe that is 112kHz - would like to run it on 73kHz. The tank coil >> reads about 80uH, can I just pad it down with more "C" to get to 73kHz or >> would that mess up the L/C ratio and thus lower the loaded "Q" ? >> >> Another question - anyone have a spare "Purple" Decca on 71kHz that >> they would consider parting with? >> >> >> >> -- >> 73 Warren K2ORS >> WD2XGJ >> WD2XSH/23 >> WE2XEB/2 >> WE2XGR/1 >> WG2XRS/1 >> >> >> >> > > > > -- > 73 Warren K2ORS > WD2XGJ > WD2XSH/23 > WE2XEB/2 > WE2XGR/1 > > > -- 73 Warren K2ORS WD2XGJ WD2XSH/23 WE2XEB/2 WE2XGR/1 --047d7b5d474ab5badd04e333451f Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
Mal,
=A0 =A0 Many thanks for the info on the low bad D= ecca tanks!
Does your handbook call out the specs for the guard c= ircuit (link coil and capacitance)?

73 Warren



On Mon, Aug 5, 2013 at 8:00 AM, mal hamilton <g3kevmal@talktalk.net= > wrote:
Hi Warren
Decca LOW BAND --------------inductor L reqd to resonate on 73 khz=20 ------------126.75 uH ie=A0 Total C in PA unit 37.5 nF plus 126.75 uH in=20 series =3D=3D=3D=3D=3D 73 Khz
High band versions do not have enough C in PA UNIT
73 DE MAL/G3KEV
=A0
=A0
=A0
Sent: Monday, August 05, 2013 1:59 AM
Subject: Re: LF: Fw: Decca Experts - Converting Red to Purple= =20 ?
=A0
Hi Mal,=20
=A0
=A0=A0 Many thanks for the e-mail!
I am looking for details on the tank circuit for the "Purple"= ; Decca which=20 was on 70.8 kHz - either inductance or number of turns or capacitance. Also= , any=20 details on the guard circuit for the 70kHz version - how many turns on the = link=20 and capacitance.
I have an unconverted 112kHz unit, not sure if that is considered high= band=20 or low band?
=A0
=A0=A0=A0 I really appreciate your help!
=A0
vy 73 Warren K2ORS
=A0


On Sun, Aug 4, 2013 at 3:08 PM, mal hamilton <g3kevmal@talktalk.net> wrote:
=A0
=A0
Sent: Sunday, August 04, 2013 7:59 PM
Subject: Re: LF: Decca Experts - Converting Red to Purple=20 ?
=A0
Warren
I have all the original handbooks for the Decca 5501 range if you ne= ed=20 specific info let me know. The low band versions have a different Capacit= or=20 board and are easy to mod for 73 Khz
The higher band versions are not so convenient to mod for 73 but mor= e=20 suited to 136.
I have 2 x 5501 units for the high band modified for 136 but fortuna= tely=20 I have 2 x C boards=A0 for the low band so I just need to modify the Coil= s=20 for 73 if we got this band again
I was active on 73 towards the end but by then nearly everyone had m= oved=20 to 136
Most hams in the UK were using modified Audio amps on 73 and I do no= t=20 recall anyone using the decca on that band at the time. Decca amps were n= ot=20 available in the early days of 73
Modes at the time were CW and QRSS
mal/g3kev
=A0
=A0
=A0
=A0
=A0
=A0
=A0
=A0
Sent: Sunday, August 04, 2013 1:28 AM
Subject: LF: Decca Experts - Converting Red to Purple=20 ?
=A0
Hello to all of the Decca Navigator experts out there...= =20
=A0
=A0=A0=A0 I have an unconverted Decca 5501 transmitter which is=20 marked "Red" - I believe that is 112kHz - would like to run it = on 73kHz.=A0=20 The tank coil reads about 80uH, can I just pad it down with more "C&= quot; to get to=20 73kHz or would that mess up the L/C ratio and thus lower the loaded "= ;Q"=20 ?
=A0
=A0=A0=A0 Another question - anyone have a spare "Purple" = Decca=20 on 71kHz that they would consider parting with?
=A0
=A0
=A0
--
73 Warren=20 K2ORS
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=20 WD2XGJ=20
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=20 WD2XSH/23
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=20 WE2XEB/2
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=20 WE2XGR/1
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=20 WG2XRS/1


=A0=20


=A0
--
73 Warren=20 K2ORS
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=20 WD2XGJ=20
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=20 WD2XSH/23
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=20 WE2XEB/2
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=20 WE2XGR/1

=A0



--
73 Warren K2= ORS
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WD2XGJ
=A0 =A0 =A0 =A0 =A0 =A0 = =A0 =A0 WD2XSH/23
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 WE2XEB/2
=A0 =A0 = =A0 =A0 =A0 =A0 =A0 =A0 WE2XGR/1

=A0
--047d7b5d474ab5badd04e333451f--