Return-Path: Received: from mtain-dj04.r1000.mx.aol.com (mtain-dj04.r1000.mail.aol.com [172.19.187.140]) by air-di06.mail.aol.com (v129.4) with ESMTP id MAILINDI063-eacc4c20cb83fb; Tue, 22 Jun 2010 10:41:07 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dj04.r1000.mx.aol.com (Internet Inbound) with ESMTP id F00B038000200; Tue, 22 Jun 2010 10:41:03 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OR4dV-0001Se-A1 for rs_out_1@blacksheep.org; Tue, 22 Jun 2010 15:39:37 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OR4dU-0001SV-Lg for rsgb_lf_group@blacksheep.org; Tue, 22 Jun 2010 15:39:36 +0100 Received: from cavuit02.kulnet.kuleuven.be ([134.58.240.44]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OR4dR-0000Tv-0a for rsgb_lf_group@blacksheep.org; Tue, 22 Jun 2010 15:39:36 +0100 Received: from smtps01.kuleuven.be (smtpshost01.kulnet.kuleuven.be [134.58.240.74]) by cavuit02.kulnet.kuleuven.be (Postfix) with ESMTP id 0F4BE51C00B for ; Tue, 22 Jun 2010 16:39:13 +0200 (CEST) Received: from ICTS-S-HUB-N2.luna.kuleuven.be (icts-s-hub-n2.luna.kuleuven.be [10.112.9.12]) by smtps01.kuleuven.be (Postfix) with ESMTP id 0A4E131E705 for ; Tue, 22 Jun 2010 16:39:13 +0200 (CEST) Received: from ICTS-S-EXC2-CA.luna.kuleuven.be ([10.112.11.13]) by ICTS-S-HUB-N2.luna.kuleuven.be ([10.112.9.12]) with mapi; Tue, 22 Jun 2010 16:39:13 +0200 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Date: Tue, 22 Jun 2010 16:39:12 +0200 Thread-Topic: Re: Re: RE: Re: 137 Revival Thread-Index: AcsSE4Z7MNjRF4D3SL+6VjyhlxtQZQAA2Fu6 Message-ID: References: <000c01cb11dc$2b310020$0401a8c0@xphd97xgq27nyf> <3A2133327AFB454CAC336E25F96F4352@TonyLaptop> <00f301cb1204$27dc76c0$0217aac0@desktop> <5CB3170C92154284B48334F50A8DDD89@IBM7FFA209F07C>,<6AEC4DD1A0F04696AB42F2158C87F963@TonyLaptop> In-Reply-To: <6AEC4DD1A0F04696AB42F2158C87F963@TonyLaptop> Accept-Language: nl-NL, nl-BE Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: nl-NL, nl-BE MIME-Version: 1.0 X-KULeuven-Information: Katholieke Universiteit Leuven X-KULeuven-Scanned: Found to be clean X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: RE: Re: Re: RE: Re: 137 Revival Content-Type: multipart/alternative; boundary="_000_BF4A524700075746A6467658DFC7102C5107CB12A7ICTSSEXC2CAlu_" 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,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: 3039cdbc9d084c20cb7f44c6 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --_000_BF4A524700075746A6467658DFC7102C5107CB12A7ICTSSEXC2CAlu_ Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Tony, have a look at http://wireless.org.uk/136rig.htm I built a clone of the 400W version many years ago, just adapted the 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 (al= though 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@blacksheep.or= g] 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 th= at I was looking at, so I'll steer clear. Shame there's no more G0MRF kits. Tony, EI8JK. ----- Original Message ----- From: Chris To: rsgb_lf_group@blacksheep.org 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-mailed 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 ----- From: James Cowburn To: rsgb_lf_group@blacksheep.org 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!!?? :) 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 notified that you must not= read this message. Any review, retransmission, dissemination or other use of, or taking of an= y action in reliance upon, this information by persons or entities 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 messa= ge as well as its attachments and delete the whole from any computer. ________________________________ From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@black= sheep.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 transmitter that= uses easily available components ? Tony, EI8JK. ----- Original Message ----- From: mal hamilton To: rsgb 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 --_000_BF4A524700075746A6467658DFC7102C5107CB12A7ICTSSEXC2CAlu_ Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Tony,
 
I built a clone of the  40= 0W version many years ago, just adapted the FET's (IRFP350's) and the outp= ut transformer as I wanted to run it off a 56V PSU I had available.&n= bsp;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 lim= iter in the PSU.
In 2008 I adapted it to= 500kHz, just replaced the output tranformer (the double U core recyc= led from a TV HV worked fine on 136 but got very hot on 500) and of= course the LPF.
 
73, Rik  ON7YD - OR= 7T
 
Van: owner-rsgb_= lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.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 -----
From: Chris
Sent: Tuesday, June 22, 2010 1:37= PM
Subject: LF: Re: RE: Re: 137 Reviva= l

Hello Tony,
I tried the TX in 'LF Today', 'A Begi= nners Transmitter', p6 of the first edition and had nothing but trouble,= blowing numerous FETs. E-mailed the author DF3LP several times, but he ne= ver 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= PM
Subject: LF: RE: Re: 137 Revival

Hi Tony

 

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

 

There are som= e good designs in LF today

 

 <= /p>

 <= /p>

 <= /p>

Dr. James Cow= burn  G7NKS

E james.cowburn@virgin.net

 

The= information transmitted is intended only for the person to whom it is add= ressed and may contain confidential and/or privileged material. If you are not the intended recipient, you are hereby notified= that you must not read this message.
Any review, retransmission, dissemination or other use of, or taking of an= y action in reliance upon, this information by persons or entities 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 messa= ge as well as its attachments and delete the whole from any computer.<= /font>

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

 

I fully intend to be QRV on 137 by the wi= nter.

On that note, can anyone recommend a reli= able foolproof transmitter that uses easily available components ?<= /font>

 

Tony, EI8JK.

 

----- Original Message -----

To: rsgb

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

Subject: LF: 137 Revival

 

LF

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

CW, QRSCW, Invisible Ros etc

G3KEV

 

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