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[195.171.43.25]) by mx.google.com with ESMTP id ut2si2545707bkb.221.2013.08.05.01.52.23 for ; Mon, 05 Aug 2013 01:52:24 -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 1V6GTU-0003mm-FG for rs_out_1@blacksheep.org; Mon, 05 Aug 2013 09:49:08 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1V6GTT-0003md-Su for rsgb_lf_group@blacksheep.org; Mon, 05 Aug 2013 09:49:07 +0100 Received: from out1.ip01ir2.opaltelecom.net ([62.24.128.237]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1V6GTR-0008MT-Hg for rsgb_lf_group@blacksheep.org; Mon, 05 Aug 2013 09:49:06 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AmMGAJJm/1FcHYjX/2dsb2JhbABagkJErzmQRYEdF3SCJAEBBQhOFRkFBQMDEQQBAS85FggGEwgJh20DE6wJDYhejSeBOoE/gxl0A4hyhg6Gd44RhSeDGDuBNQ X-IPAS-Result: AmMGAJJm/1FcHYjX/2dsb2JhbABagkJErzmQRYEdF3SCJAEBBQhOFRkFBQMDEQQBAS85FggGEwgJh20DE6wJDYhejSeBOoE/gxl0A4hyhg6Gd44RhSeDGDuBNQ X-IronPort-AV: E=Sophos;i="4.89,817,1367967600"; d="scan'208,217";a="437962327" Received: from host-92-29-136-215.as13285.net (HELO malHP) ([92.29.136.215]) by out1.ip01ir2.opaltelecom.net with SMTP; 05 Aug 2013 09:49:02 +0100 Message-ID: <9EAB283AD71842919FC83FD11BC58188@malHP> From: "mal hamilton" To: References: <5B7EABE7E07E4CBA942ABD001F4587E3@malHP> In-Reply-To: Date: Mon, 5 Aug 2013 09:48:58 +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: Warren More decca info Low band models have total C 37.5nF so u can work out what L is need to resonate PA High band total C 25 nF With your H band version increase C to 37.5 nF approx and calculate L to resonate 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: 4933636f78fd1782d378a0372a2e835c Subject: LF: Re: Decca Experts - Converting Red to Purple ? Content-Type: multipart/alternative; boundary="----=_NextPart_000_0025_01CE91C1.019F3610" 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: 875 This is a multi-part message in MIME format. ------=_NextPart_000_0025_01CE91C1.019F3610 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Warren More decca info Low band models have total C 37.5nF so u can work out what L is need to = resonate PA High band total C 25 nF=20 With your H band version increase C to 37.5 nF approx and calculate L to = resonate 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 ------=_NextPart_000_0025_01CE91C1.019F3610 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Warren
More decca info
Low band models have total C 37.5nF so u can work out what L is = need to=20 resonate PA
High band total C 25 nF
With your H band version increase C to 37.5 nF approx and calculate = L to=20 resonate
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, 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?
 
    I really appreciate your help!
 
vy 73 Warren K2ORS
 


On Sun, Aug 4, 2013 at 3:08 PM, mal hamilton = <g3kevmal@talktalk.net> wrote:
 
 
From: mal hamilton =
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 = fortunately=20 I have 2 x C boards  for the low band so I just need to modify = the Coils=20 for 73 if we got this band again
I was active on 73 towards the end but by then nearly everyone = had moved=20 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 is=20 marked "Red" - I believe that is 112kHz - would like to run it on = 73kHz. =20 The tank coil reads about 80uH, can I just pad it down with more "C" = to get to=20 73kHz or would that mess up the L/C ratio and thus lower the loaded = "Q"=20 ?
 
    Another question - anyone have a spare = "Purple" Decca=20 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

  ------=_NextPart_000_0025_01CE91C1.019F3610--