Return-Path: Received: from mtain-db11.r1000.mx.aol.com (mtain-db11.r1000.mx.aol.com [172.29.64.95]) by air-me05.mail.aol.com (v129.4) with ESMTP id MAILINME051-8bb04c20d73311d; Tue, 22 Jun 2010 11:30:59 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-db11.r1000.mx.aol.com (Internet Inbound) with ESMTP id DB1CC38000054; Tue, 22 Jun 2010 11:30:55 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OR5QH-0004F2-N3 for rs_out_1@blacksheep.org; Tue, 22 Jun 2010 16:30:01 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OR5QG-0004Ei-Eu for rsgb_lf_group@blacksheep.org; Tue, 22 Jun 2010 16:30:00 +0100 Received: from out1.ip09ir2.opaltelecom.net ([62.24.128.245]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OR5QF-0001rF-1y for rsgb_lf_group@blacksheep.org; Tue, 22 Jun 2010 16:30:00 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AkIFAE90IExcEYOE/2dsb2JhbACBQ51SccFYhRsE X-IronPort-AV: E=Sophos;i="4.53,460,1272841200"; d="scan'208,217";a="439257602" Received: from unknown (HELO your91hoehfy9g) ([92.17.131.132]) by out1.ip09ir2.opaltelecom.net with SMTP; 22 Jun 2010 16:29:50 +0100 Message-ID: <002901cb121f$c1ead570$0301a8c0@your91hoehfy9g> From: "mal hamilton" To: References: <000c01cb11dc$2b310020$0401a8c0@xphd97xgq27nyf> <3A2133327AFB454CAC336E25F96F4352@TonyLaptop> <00f301cb1204$27dc76c0$0217aac0@desktop> <5CB3170C92154284B48334F50A8DDD89@IBM7FFA209F07C>,<6AEC4DD1A0F04696AB42F2158C87F963@TonyLaptop> Date: Tue, 22 Jun 2010 16:29:50 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Re: RE: Re: Re: RE: Re: 137 Revival Content-Type: multipart/alternative; boundary="----=_NextPart_000_0026_01CB1228.22B748E0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=EXCUSE_16,HTML_50_60, HTML_FONTCOLOR_UNKNOWN,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 x-aol-global-disposition: G x-aol-sid: 3039ac1d405f4c20d72f5bbc X-AOL-IP: 193.82.116.20 ------=_NextPart_000_0026_01CB1228.22B748E0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable My 500 Kcs class E TX uses a LOPT and does not get warm generating suf= ficient RF for 10W erp g3kev ----- Original Message -----=20 From: Rik Strobbe=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, June 22, 2010 3:39 PM Subject: LF: RE: Re: Re: RE: Re: 137 Revival Tony, have a look at http://wireless.org.uk/136rig.htm I built a clone of the 400W version many years ago, just adapted th= e FET's (IRFP350's) and the output transformer as I wanted to run it= off a 56V PSU I had available. Further extended the LPF with an extra= L-C stage (although it works fine with the original LPF) and added a= zobel network (as in the 1kW version). Never had a FET blown, even not when transmitting without antenna ot= with a shortcircuit in the coax. Maybe also thanks to the 14A current= limiter in the PSU. In 2008 I adapted it to 500kHz, just replaced the output tranformer= (the double U core recycled from a TV HV worked fine on 136 but got= very hot on 500) and of course the LPF. 73, Rik ON7YD - OR7T ----------------------------------------------------------------------= -------- Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksh= eep.org] namens Tony Baldwin [ei8jk@o2.ie] Verzonden: dinsdag 22 juni 2010 15:57 Aan: rsgb_lf_group@blacksheep.org Onderwerp: LF: Re: Re: RE: Re: 137 Revival Thanks for that Chris. I have the 2nd edition LF Today and the DF3LP is now on p69 and was= one that I was looking at, so I'll steer clear. Shame there's no more G0MRF kits. Tony, EI8JK. ----- Original Message -----=20 From: Chris=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, June 22, 2010 1:37 PM Subject: LF: Re: RE: Re: 137 Revival Hello Tony, I tried the TX in 'LF Today', 'A Beginners Transmitter', p6 of the= first edition and had nothing but trouble, blowing numerous FETs. E-m= ailed the author DF3LP several times, but he never replied. Watch out= for errors in the circuits in this book! 73, Chris, G4AYT, Whitstable, Kent. ----- Original Message -----=20 From: James Cowburn=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, June 22, 2010 1:12 PM Subject: LF: RE: Re: 137 Revival Hi Tony Mal transmits reliably and doesn=92t suffer fools if that helps!= !?? J=20 There are some good designs in LF today Dr. James Cowburn G7NKS E james.cowburn@virgin.net The information transmitted is intended only for the person to= whom it is addressed and may contain confidential and/or privileged= material. If you are not the intended recipient, you are hereby notif= ied that you must not read this message. Any review, retransmission, dissemination or other use of, or ta= king of any action in reliance upon, this information by persons or en= tities other than the intended recipient is prohibited. Consequently,= this email is not intended to be contractually binding. If you received this in error, please contact the sender, return= the message as well as its attachments and delete the whole from any= computer. ----------------------------------------------------------------------= ---- From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_g= roup@blacksheep.org] On Behalf Of Tony Baldwin Sent: 22 June 2010 11:49 To: rsgb_lf_group@blacksheep.org Subject: LF: Re: 137 Revival I fully intend to be QRV on 137 by the winter. On that note, can anyone recommend a reliable foolproof transmit= ter that uses easily available components ? Tony, EI8JK. ----- Original Message -----=20 From: mal hamilton=20 To: rsgb=20 Sent: Tuesday, June 22, 2010 8:26 AM Subject: LF: 137 Revival LF How about a 137 kcs Revival, much more interesting than 500,= which is more like 160 metres. CW, QRSCW, Invisible Ros etc G3KEV ------=_NextPart_000_0026_01CB1228.22B748E0 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
My 500 Kcs class E TX uses a LOPT and= does not get=20 warm generating sufficient RF for 10W erp
g3kev
 
----- Original Message -----
From:=20 Rik Strobbe
Sent: Tuesday, June 22, 2010= 3:39=20 PM
Subject: LF: RE: Re: Re: RE:= Re: 137=20 Revival

Tony,
 
I built a clone of the  = 400W version=20 many years ago, just adapted the FET's (IRFP350's) and the output tr= ansformer=20 as I wanted to run it off a 56V PSU I had available. Furth= er=20 extended the LPF with an extra L-C stage (although it works fine wit= h the=20 original LPF) and added a zobel network (as in the 1kW=20 version).
Never ha= d a FET=20 blown, even not when transmitting without antenna ot with= a=20 shortcircuit in the coax. Maybe also thanks to the 14A current limit= er in the=20 PSU.
In 2008 I adapted it to= 500kHz, just=20 replaced the output tranformer (the double U core recycled from= a TV=20 HV worked fine on 136 but got very hot on 500) and of course th= e=20 LPF.
 
73, Rik  ON7YD - OR= 7T
 
Van:=20 owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.o= rg] namens=20 Tony Baldwin [ei8jk@o2.ie]
Verzonden: dinsdag 22 juni 2010= =20 15:57
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: LF: Re:=20 Re: RE: Re: 137 Revival

Thanks for that Chris.
I have the 2nd edition LF Today and= the DF3LP is=20 now on p69 and was one that I was looking at, so I'll steer=20 clear.
Shame there's no more G0MRF kits.
Tony, EI8JK.
----- Original Message -----
From:= Chris
Sent: Tuesday, June 22, 201= 0 1:37=20 PM
Subject: LF: Re: RE: Re: 13= 7=20 Revival

Hello Tony,
I tried the TX in 'LF Today', 'A= Beginners=20 Transmitter', p6 of the first edition and had nothing but trouble,= blowing=20 numerous FETs. E-mailed the author DF3LP several times, but he nev= er=20 replied. Watch out for errors in the circuits in this book!=
73,
Chris, G4AYT, Whitstable, Kent.
----- Original Message -----
Sent: Tuesday, June 22,= 2010 1:12=20 PM
Subject: LF: RE: Re: 137= =20 Revival

Hi=20 Tony

 

Mal transmits=20 reliably and doesn=92t suffer fools if that helps!!?? =20  J=20

 

There are some=20 good designs in LF today

 

From:=20 owner-rsgb_lf_group@blacksheep.org=20 [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Tony Baldwin
Sent: 22 June 2010= 11:49
To:= =20 rsgb_lf_group@blacksheep.org
Subject: LF: Re: 137=20 Revival

 

I fully intend to be QR= V on=20 137 by the winter.

On that note, can anyon= e=20 recommend a reliable foolproof transmitter that uses easily avai= lable=20 components ?

 

Tony,=20 EI8JK.

 

----- Original Mess= age -----=20

To: rsgb=20

Sent:=20 Tuesday, June 22, 2010 8:26 AM

Subject: LF:=20 137 Revival

<= SPAN style=3D"FONT-SIZE: 12pt"> 

LF

How about a 137 kcs= Revival,=20 much more interesting than 500, which is more like 160=20 metres.

CW, QRSCW, Invisibl= e Ros=20 etc

G3KEV=

<= SPAN style=3D"FONT-SIZE: 12pt"> 

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