Return-Path: Received: (qmail 39268 invoked from network); 13 Aug 2004 11:57:08 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore01.plus.net with SMTP; 13 Aug 2004 11:57:08 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1BvakG-0006oz-99 for dave@picks.force9.co.uk; Fri, 13 Aug 2004 13:01:16 +0100 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1BvakG-0006ow-5y for dave@picks.force9.co.uk; Fri, 13 Aug 2004 13:01:16 +0100 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1BvagF-000D1Z-Jx for dave@picks.force9.co.uk; Fri, 13 Aug 2004 12:57:07 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Bvafg-0005zV-Sp for rs_out_1@blacksheep.org; Fri, 13 Aug 2004 12:56:32 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Bvafg-0005zM-AH for rsgb_lf_group@blacksheep.org; Fri, 13 Aug 2004 12:56:32 +0100 Received: from mailserver2.webhot2.dk ([130.228.0.22]) by relay.thorcom.net with esmtp (Exim 4.41) id 1Bvafb-0000Nu-IM for rsgb_lf_group@blacksheep.org; Fri, 13 Aug 2004 12:56:32 +0100 Received: from CPHL039 [80.199.163.98] by mailserver2.webhot2.dk (SMTPD32-6.06) id AC61957E0030; Fri, 13 Aug 2004 13:56:17 +0200 Message-ID: <000e01c4812c$342e4c10$020aa8c0@hasbro.co.uk> From: "OZ7QC" To: rsgb_lf_group@blacksheep.org References: <002601c480a7$e7ea4400$1600a8c0@hasbro.co.uk> <001501c480ad$373a9460$0fa424d5@jboi0045tiscali> <004501c480b3$58654670$1600a8c0@hasbro.co.uk> <008801c480cc$25700ac0$0fa424d5@jboi0045tiscali> Date: Fri, 13 Aug 2004 13:53:51 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 X-Note: This E-mail was scanned for SPAM and VIRUSES by Declude 1.75 X-SPF-Result: relay.thorcom.net: 130.228.0.22 is neither permitted nor denied by domain of schaui.dk X-Spam-Score: 0.5 (/) X-Spam-Report: autolearn=no,HTML_40_50=0.474,HTML_MESSAGE=0.001 Subject: LF: Re: Loop ant 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=0.5 required=5.0 tests=HTML_40_50,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
Hi Jeff and Lf group,
 
Take a look at this page http://www.imagenisp.ca/jsm/Loop.html in the mean time I will produce some data and pictures of my own version with some modifications for VLF and LF.
 
Vy 73
Ingolf OZ7QC
----- Original Message -----
From: F6CWN
To: rsgb_lf_group@blacksheep.org
Sent: Friday, August 13, 2004 2:26 AM
Subject: LF: Re: Re: Re: RX in OZ

12./08/2004   2223z
 
Hello Ingolf,
 
 Thanks for the infos, indeed,i should appreciate some additionals
comments if you have some time...
 
My system use very old 75 Ohms Andrew ( or something like that)
 coax cable out of order for VHF activity.( normaly i use it for 80 or
 160m dipole!)
Only the braid is used, with a space of 3.5 time the diameter between
every turn. The spacers are PVC type, but without lead ( you test it in
 the  µwave oven, it must be cold!). The number of turns is always even,
 for a central pick up to the ground. The tune capacity must to be a
very good one to keep high Q ( very important). I use PTFE capacitor or
mica type. The variable capacitor is a little one ( around 150 pF air model with
very good ground contacts). I use a little DC motor and a gear box to tune
this system from the station ( essential if you want to have the peace with
your neighbouring, otherwise take the audio to the maximum, open the window
and tune for max noise... at 2 o'clock in the morning it's super!  :0)  )
A little relay switch a additional capacitor to increase the band.
On the middle of the loop, i put a little second loop ( around 30 cm of diameter),
one turn, connect to a simple coax cable, this loop is used to  tune the RX
equipment to the desired frequency with the transmit generator ( ultra QRP
of course!), then the tune for max is very easy from the shack ( and more
sociable!).
At the two end of the loop i put a preamplifier ( not exactly preamplifier, rather
Z translator ) to convert the high Z symmetrical from the loop to 50 Ohms asymmetric.
I test many configurations (valves, bipolar and MOS) but at this moment no significant
results...( say you more in the 10 futures years...)
All this thingamajig ( loop, tune system, preamp ,rotator) is at about 1.5 meter AGL.
I must continue the investigations, but XYL ( F6IFR ) find me some other entertainings
during the freetime! (hi!)
To be continued...
 
Vy 73
Jeff / F6CWN
 
----- Original Message -----
From: OZ7QC
To: rsgb_lf_group@blacksheep.org
Sent: Thursday, August 12, 2004 9:28 PM
Subject: LF: Re: Re: RX in OZ

Hi Jeff,
 
Thanks for your reply
 
Yes I think I can receive him to but at the moment there is to much crack from thunder storm her in the array.
 
I have made the loop out of VE7LS http://www.lwca.org/miscdocs/ve7sl.htm idea, but with 40 turns 0,5mm in a special way to avoid internal capacity for the tuning coil, and 2 turns for the RX coil.
I don't have data or picture of my antenna yet but if you are interested I can produce some specification for you.
 
Vy 73
Ingolf OZ7QC