Return-Path: Received: from rly-me02.mx.aol.com (rly-me02.mail.aol.com [172.20.83.35]) by air-me06.mail.aol.com (v121_r4.4) with ESMTP id MAILINME063-9a3495a00cbb2; Tue, 30 Dec 2008 06:07:04 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-me02.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINME027-9a3495a00cbb2; Tue, 30 Dec 2008 06:06:54 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LHcQi-0003kF-MP for rs_out_1@blacksheep.org; Tue, 30 Dec 2008 11:06:32 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LHcQi-0003k6-6D for rsgb_lf_group@blacksheep.org; Tue, 30 Dec 2008 11:06:32 +0000 Received: from smtp-out-3.talktalk.net ([62.24.128.233] helo=smtp.talktalk.net) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1LHcQh-0007Lc-Hn for rsgb_lf_group@blacksheep.org; Tue, 30 Dec 2008 11:06:32 +0000 X-Path: TTSMTP X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ArwEAN+PWUlOlWwJ/2dsb2JhbACCQC+BZoQrgiYGsVNYkEeFBoE+ Received: from unknown (HELO mal769a60aa920) ([78.149.108.9]) by smtp.talktalk.net with SMTP; 30 Dec 2008 11:06:11 +0000 Message-ID: <003701c96a6e$9fe87bd0$0301a8c0@mal769a60aa920> From: "mal hamilton" To: "rsgb" Date: Tue, 30 Dec 2008 11:06:10 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Spam-Score: 1.2 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RCVD_IN_SORBS_WEB=1.236 Subject: LF: QSB Content-Type: multipart/alternative; boundary="----=_NextPart_000_0034_01C96A6E.9F608720" 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=HTML_20_30,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-IP: 193.82.116.20 ------=_NextPart_000_0034_01C96A6E.9F608720 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable All One way to help overcome QSB on LF/MF/HF is to increase the RF power. Most o= f the QRP acty on these bands suffers badly from QSB whereas the medium and=20= high power stations over come it most of the time. This is one reason why it would be better if we had more permitted power on=20= 500 khz.=20 100 watts erp was considered low power in the marine service, applicable mos= tly to emergency and standby transmitters. The main ship transmitters had ar= ound 1kw - 2kw available, using a 4cx1500 tube, 2 x 4-400 tubes, 4 - 6 x 4c= x250 tubes and a variety of others in the PA stage. 73 de mal/g3kev ------=_NextPart_000_0034_01C96A6E.9F608720 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
All
One way to help overcome QSB on LF/MF/HF is= to=20 increase the RF power. Most of the QRP acty on these bands suffers badly fro= m=20 QSB whereas the medium and high power stations over come it most of the=20 time.
This is one reason why it would be better i= f we had=20 more permitted power on 500 khz.
100 watts erp was considered low power in t= he=20 marine service, applicable mostly to emergency and standby transmitters. The= =20 main ship transmitters had around 1kw -  2kw available, using a 4cx1500= =20 tube, 2 x 4-400 tubes, 4 - 6 x 4cx250 tubes and a variety of others in the P= A=20 stage.
73 de mal/g3kev
 
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