Return-Path: Received: (qmail 70440 invoked from network); 1 Dec 2004 15:40:09 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore02.plus.net with SMTP; 1 Dec 2004 15:40:09 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1CZWbr-0003xp-Co for dave@picks.force9.co.uk; Wed, 01 Dec 2004 15:41:39 +0000 Received: from [192.168.67.1] (helo=ptb-mxcore01.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1CZWbq-0003xi-Rp for dave@picks.force9.co.uk; Wed, 01 Dec 2004 15:41:38 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (Exim 4.30; FreeBSD) id 1CZWaO-000P7P-FT for dave@picks.force9.co.uk; Wed, 01 Dec 2004 15:40:08 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1CZWZn-0002Yf-Ay for rs_out_1@blacksheep.org; Wed, 01 Dec 2004 15:39:31 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1CZWZm-0002YW-Sz for rsgb_lf_group@blacksheep.org; Wed, 01 Dec 2004 15:39:30 +0000 Received: from h34.rdg.cp.net ([209.228.29.84] helo=n068.sc1.cp.net) by relay.thorcom.net with esmtp (Exim 4.41) id 1CZWZb-00007Q-OE for rsgb_lf_group@blacksheep.org; Wed, 01 Dec 2004 15:39:30 +0000 Received: from l8p8y6 (62.252.208.90) by n068.sc1.cp.net (7.0.030.2) id 419EA27C001008B9 for rsgb_lf_group@blacksheep.org; Wed, 1 Dec 2004 15:39:13 +0000 Message-ID: <000201c4d78f$77fed0e0$5ad0fc3e@l8p8y6> From: "hamilton mal" To: rsgb_lf_group@blacksheep.org References: <102.5527a8fc.2edcb062@aol.com> Date: Tue, 30 Nov 2004 10:47:22 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4807.1700 X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4807.1700 X-SPF-Result: relay.thorcom.net: 209.228.29.84 is neither permitted nor denied by domain of virgin.net X-Spam-Score: 0.9 (/) X-Spam-Report: autolearn=no,HTML_30_40=0.809,HTML_MESSAGE=0.001,RCVD_IN_SORBS=0.1 Subject: Re: LF: Linear modes Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit

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

From: WarmSpgs@aol.com

To: rsgb_lf_group@blacksheep.org

Sent: Monday, November 29, 2004 5:03 PM

Subject: Re: LF: Linear modes

>>> The 500 khz band if it becomes available to radio amateurs has traditionally
been a CW band. >>>

And RTTY. And other digital modes.

Only rtty and variations on 516 khz in recent years. This ex marine band was 99.9% CW until it was phased out in favour of INMARSAT.

Of course, it's also MF rather than LF, where a transmitting antenna of a given size is eight times more efficient than at 2200m, and where there's only about a third the QRN.

This is not true. If there is an electrical storm generating QRN then all bands suffer equally from LF through to HF.

I have checked this over the years and 160 metres suffers very severely during an electrical storm.

There is very little difference on 137, 500 and 1800 khz when it comes to QRN. I have checked it so many times.

Yes, I suppose under those conditions, "normal CW" might be adequate.

CW is the only mode. PSK is useless on LF/MF/HF under noisy condx and especially in QRN. The phase gets totally distorted and the information at the RX end lost. PSK has been tried in the past by some commercial operators and it never was a success except at VHF/UHF and beyond.

For amateur radio purposes a couple of good CW operators is all that is required to exchange the necessary information between stations in an economical bandwidth. Use data modes if you have a large volume of traffic to shift.

de G3KEV