Return-Path: Received: (qmail 18523 invoked from network); 24 Jul 2002 15:24:51 -0000 Received: from warrior.services.quay.plus.net (212.159.14.227) by mailstore with SMTP; 24 Jul 2002 15:24:51 -0000 Received: (qmail 17894 invoked from network); 24 Jul 2002 15:22:11 -0000 Received: from post.thorcom.com (193.82.116.70) by warrior.services.quay.plus.net with SMTP; 24 Jul 2002 15:22:10 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 17XNrs-0000id-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 24 Jul 2002 16:16:00 +0100 Received: from mta1-svc.business.ntl.com ([62.253.164.41]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 17XNrr-0000iW-00 for rsgb_lf_group@blacksheep.org; Wed, 24 Jul 2002 16:15:59 +0100 Received: from l8p8y6 ([62.252.232.149]) by mta1-svc.business.ntl.com (InterMail vM.4.01.03.27 201-229-121-127-20010626) with SMTP id <20020724151555.NAEL19938.mta1-svc.business.ntl.com@l8p8y6> for ; Wed, 24 Jul 2002 16:15:55 +0100 Message-ID: <000c01c23323$0adfb460$95e8fc3e@l8p8y6> From: "hamilton mal" To: rsgb_lf_group@blacksheep.org Subject: LF: DL2NDO/P Date: Wed, 24 Jul 2002 16:01:17 +0100 MIME-Version: 1.0 Content-Type: text/html; charset=windows-1252 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4807.1700 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-transfer-encoding: 8bit

For those that like figures and data to speculate, invent or guess erp emitted by others on LF, I measured the signal today from DL2NDO/P and other associated callsigns used at various times.

on 136.5 khz.

Level meter SPM-12 (calibrated) Time 1020 utc

Signal level -50 db

Noise floor -90db

Signal above noise -40 db

---------------------------

Speclab (plotter)

Signal -18 db max amplitude

Signal -61 min amplitude

Signal excursion (key up/key down) -43 db

Noise floor indicated -90 db

---------------------------------

Antenna type.Vertical Loop, max signal N/S

Loop 124 feet horiz x 40 feet vertical symetrical rectangular = 4960 sq feet

Resonant natural freq 3065 khz

wire 2.5 mm insulated

Loop feed 75 ohm coax, connected to loop at right bottom corner,coax about 150 ft long to shack, parallel tuned for resonance.

Rx shows an increase of 14 db noise gain with antenna connected, no preamp, ant fed direct to rx. Local environment quiet no hostile local qrm.

Rx bandwidth 25 hz

My locator IO94SH

No attempt here to interpret or calculate voltage at rx input.

Signal steady all day until I went qrt at 1356 utc

73 de Mal/G3KEV