Return-Path: Received: (qmail 15374 invoked from network); 13 Sep 2001 13:20:34 -0000 Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur.plus.net with SMTP; 13 Sep 2001 13:20:34 -0000 Received: (qmail 3973 invoked from network); 13 Sep 2001 13:20:12 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 13 Sep 2001 13:20:12 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 15hVjX-0003ck-00 for rsgb_lf_group-outgoing@blacksheep.org; Thu, 13 Sep 2001 13:36:43 +0100 Received: from anchor-post-32.mail.demon.net ([194.217.242.90]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 15hVjV-0003cf-00 for rsgb_lf_group@blacksheep.org; Thu, 13 Sep 2001 13:36:41 +0100 Received: from boxernet.demon.co.uk ([194.222.47.214] helo=TRIXY) by anchor-post-32.mail.demon.net with smtp (Exim 2.12 #1) id 15hVig-00081y-0W for rsgb_lf_group@blacksheep.org; Thu, 13 Sep 2001 13:35:50 +0100 From: "Michael Probert" To: "lf group" Subject: LF: RE: Re: TV QRM. Date: Thu, 13 Sep 2001 13:34:55 -0700 Message-ID: MIME-Version: 1.0 Content-Type: text/html; charset=windows-1252 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal In-reply-to: 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

Hello All,

On the 30th August I wrote

>>>>>> Today I purchased & installed a new Panasonic TX-25 CK1 TV receiver to replace an older one of same make.

To my horror, I found that it radiates a strong rough carrier on 136.1 spreading both up and down several hundred hertz making the band inoperable on all three of my antennas. <<<<<<<<<<

The problem has now been solved .

Insertion of a filter (kindly loaned by Steve GW4ALG ) in the mains ( power ) supply was totally ineffective.

Removal of the antenna , with the TV on, also did not remove the interference.

Fortunately the dealer who supplied the TV was an independent family type Co. and the salesman was an" old time "repairman. He went to a great deal of trouble in contacting the Panasonic technical dept. They could offer no help other than suggesting that I "re tune it".

The supplier delivered two further TVs one the same model as the problem one. It produced the same qrm.

The second was an entirely different type (widescreen ). Panasonic TX-28DK1 UK standard..The interference was totally removed & I have been unable to detect any spurious signals in the LF band.

Many thanks to all who sent me advice and suggestions.

Regards

Mike GW4HXO.