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[195.171.43.25]) by mx.google.com with ESMTP id v1si158707wiy.66.2013.08.05.11.13.04 for ; Mon, 05 Aug 2013 11:13:05 -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 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1V6Ow3-0005iK-As for rs_out_1@blacksheep.org; Mon, 05 Aug 2013 18:51:11 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1V6Ow2-0005iB-ML for rsgb_lf_group@blacksheep.org; Mon, 05 Aug 2013 18:51:10 +0100 Received: from out1.ip03ir2.opaltelecom.net ([62.24.128.239]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1V6Ow0-0002Q9-E1 for rsgb_lf_group@blacksheep.org; Mon, 05 Aug 2013 18:51:09 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AnwGAJzl/1FcECWM/2dsb2JhbABbgkJEhBWrJZBAgSAXdIIkAQEFCBszFRkFBQMDEQQBASsCAjkWCAYTCAmHbQMTo3GIUg2IXo0ngTqBP4JmM3QDjwCGd44RhSeDGDuBNQ X-IPAS-Result: AnwGAJzl/1FcECWM/2dsb2JhbABbgkJEhBWrJZBAgSAXdIIkAQEFCBszFRkFBQMDEQQBASsCAjkWCAYTCAmHbQMTo3GIUg2IXo0ngTqBP4JmM3QDjwCGd44RhSeDGDuBNQ X-IronPort-AV: E=Sophos;i="4.89,820,1367967600"; d="scan'208,217";a="433081289" Received: from host-92-16-37-140.as13285.net (HELO malHP) ([92.16.37.140]) by out1.ip03ir2.opaltelecom.net with SMTP; 05 Aug 2013 18:51:06 +0100 Message-ID: <14DF884860084F5B83C1FD88B0FC763B@malHP> From: "mal hamilton" To: References: <5B7EABE7E07E4CBA942ABD001F4587E3@malHP> In-Reply-To: Date: Mon, 5 Aug 2013 18:51:03 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 15.4.3555.308 X-MimeOLE: Produced By Microsoft MimeOLE V15.4.3555.308 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: GUARD CCT LOW BAND IS C1 –330nF plus C2 –470nF in parallel resonates with the link winding of 9 turns The link winding has 9 turns on LOW band units and should be within tolerance for73 khz 6F units/85 Khz had 59 turns on main coil, 5F units would have more turns. Hope this helps de mal/g3kev [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 5047c9669d5f66b4c9d7ff0d693cf68a Subject: LF: Re: Decca Experts - Converting Red to Purple ? Content-Type: multipart/alternative; boundary="----=_NextPart_000_000F_01CE920C.BBF595E0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.7 required=5.0 tests=HTML_40_50, HTML_FONTCOLOR_UNSAFE,HTML_MESSAGE,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 Status: O X-Status: X-Keywords: X-UID: 877 This is a multi-part message in MIME format. ------=_NextPart_000_000F_01CE920C.BBF595E0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable GUARD CCT LOW BAND IS C1 =E2=80=93330nF plus C2 =E2=80=93470nF in parallel = resonates with the link winding of 9 turns=20 The link winding has 9 turns on LOW band units and should be within = tolerance for73 khz=20 6F units/85 Khz had 59 turns on main coil, 5F units would have more = turns.=20 Hope this helps de mal/g3kev From: Warren Ziegler=20 Sent: Monday, August 05, 2013 2:27 PM To: rsgb_lf_group=20 Subject: Re: LF: Re: Decca Experts - Converting Red to Purple ? Mal,=20 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 =3D=3D=3D=3D=3D 73 Khz High band versions do not have enough C in PA UNIT 73 DE MAL/G3KEV From: Warren Ziegler=20 Sent: Monday, August 05, 2013 1:59 AM To: rsgb_lf_group=20 Subject: Re: LF: Fw: Decca Experts - Converting Red to Purple ? Hi Mal,=20 Many thanks for the e-mail!=20 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=20 Sent: Sunday, August 04, 2013 7:59 PM To: rsgb_lf_group@blacksheep.org=20 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.=20 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=20 Sent: Sunday, August 04, 2013 1:28 AM To: rsgb_lf_group=20 Subject: LF: Decca Experts - Converting Red to Purple ? Hello to all of the Decca Navigator experts out there...=20 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? --=20 73 Warren K2ORS WD2XGJ=20 WD2XSH/23 WE2XEB/2 WE2XGR/1 WG2XRS/1 =20 --=20 73 Warren K2ORS WD2XGJ=20 WD2XSH/23 WE2XEB/2 WE2XGR/1 =20 --=20 73 Warren K2ORS WD2XGJ=20 WD2XSH/23 WE2XEB/2 WE2XGR/1 ------=_NextPart_000_000F_01CE920C.BBF595E0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
GUARD CCT
LOW BAND IS C1 =E2=80=93330nF plus C2 =E2=80=93470nF in parallel = resonates with the link=20 winding of 9 turns
The link winding has 9 turns on LOW band units and should be within = tolerance for73 khz
6F units/85 Khz had 59 turns on main coil,  5F units would = have more=20 turns.
Hope this helps
de mal/g3kev
 
 
 
Sent: Monday, August 05, 2013 2:27 PM
Subject: Re: LF: Re: Decca Experts - Converting Red to = Purple=20 ?
 
Mal,=20
    Many thanks for the info on the low bad Decca=20 tanks!
Does your handbook call out the specs for the guard circuit (link = coil and=20 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  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
 
 
 
Sent: Monday, August 05, 2013 1:59 AM
Subject: Re: LF: Fw: Decca Experts - Converting Red to = Purple=20 ?
 
Hi Mal,=20
 
   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,=20 any details on the guard circuit for the 70kHz version - how many = turns on the=20 link and capacitance.
I have an unconverted 112kHz unit, not sure if that is considered = high=20 band or low band?
 
    I really appreciate your help!
 
vy 73 Warren K2ORS
 


On Sun, Aug 4, 2013 at 3:08 PM, mal hamilton = <g3kevmal@talktalk.net> wrote:
 
 
Sent: Sunday, August 04, 2013 7:59 PM
Subject: Re: LF: Decca Experts - Converting Red to = Purple=20 ?
 
Warren
I have all the original handbooks for the Decca 5501 range if = you need=20 specific info let me know. The low band versions have a different = Capacitor=20 board and are easy to mod for 73 Khz
The higher band versions are not so convenient to mod for 73 = but more=20 suited to 136.
I have 2 x 5501 units for the high band modified for 136 but=20 fortunately I have 2 x C boards  for the low band so I just = need to=20 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=20 moved to 136
Most hams in the UK were using modified Audio amps on 73 and I = do not=20 recall anyone using the decca on that band at the time. Decca amps = were not=20 available in the early days of 73
Modes at the time were CW and QRSS
mal/g3kev
 
 
 
 
 
 
 
 
Sent: Sunday, August 04, 2013 1:28 AM
Subject: LF: Decca Experts - Converting Red to Purple=20 ?
 
Hello to all of the Decca Navigator experts out = there...=20
 
    I have an unconverted Decca 5501 transmitter = which=20 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=20 more "C" to get to 73kHz or would that mess up the L/C ratio and = thus lower=20 the loaded "Q" ?
 
    Another question - anyone have a spare = "Purple"=20 Decca on 71kHz that they would consider parting = with?
 
 
 
--
73 Warren=20 = K2ORS
          &nbs= p;    =20 WD2XGJ=20 =
           &nb= sp;   =20 = WD2XSH/23
          =      =20 = WE2XEB/2
          &= nbsp;    =20 WE2XGR/1
=
           &n= bsp;   =20 WG2XRS/1


 =20 =

 
--
73 Warren=20 = K2ORS
          &nbs= p;    =20 WD2XGJ=20 =
           &nb= sp;   =20 = WD2XSH/23
          =      =20 = WE2XEB/2
          &= nbsp;    =20 WE2XGR/1

 =20


 
--
73 Warren=20 K2ORS
          &nbs= p;    =20 WD2XGJ=20
           &nb= sp;   =20 WD2XSH/23
          =      =20 WE2XEB/2
          &= nbsp;    =20 WE2XGR/1

  ------=_NextPart_000_000F_01CE920C.BBF595E0--