Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id wBR2hDoN005632 for ; Thu, 27 Dec 2018 03:43:14 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1gcLaD-0000VI-EN for rs_out_1@blacksheep.org; Thu, 27 Dec 2018 02:39:37 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1gcLaD-0000V9-09 for rsgb_lf_group@blacksheep.org; Thu, 27 Dec 2018 02:39:37 +0000 Received: from mail-pg1-x529.google.com ([2607:f8b0:4864:20::529]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1gcLa7-000888-2l for rsgb_lf_group@blacksheep.org; Thu, 27 Dec 2018 02:39:35 +0000 Received: by mail-pg1-x529.google.com with SMTP id t13so8196477pgr.11 for ; Wed, 26 Dec 2018 18:39:30 -0800 (PST) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to; bh=mBa3CucdFZYFacg+AfAZj7IQDX0OCjwqgut6+Na510A=; b=qGd0xuY9z6sgZId8XvutNU/fdo1v4sgl6BUw3oHyDk44ZYxLnqYE/MHMWdgCZh5sST aoo4dn95lH2xEWBB/bDaWyi1NhdxxK+7R54Lu979asEuoZG1UUeXBY+Zh7i45cRkgLm3 RPorinWFJXf1Ku4WltUjWqa4YD0Z1VWQ79d13sbzO+0k8j9gnMiOMoZvtOeqziKP3s8G ud13LLxsPNuusgufvdDHQzVfryB4Iegb6LnSzSVtK6Yz+td7aLj6GFT049fekzLrX6QL 0fLSO5hQ8DwnYIeMP+aHyQoxiTU7WDdQq77RbPUD09JiCn996vueWuvZvzlC4jsmYOdF Qd9w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to; bh=mBa3CucdFZYFacg+AfAZj7IQDX0OCjwqgut6+Na510A=; b=FiNyNYoEcsAlDKweYqX3wdzXlVw5IOoSibnK+7LN+vZHDoEWYZsjL5ASY93JTcB9Bh OQ7El1Yi1ef6rc6VQadT3SExZH2SeZ9xH2ZWr/JxCKjQzTkr5BCA3IBNi0vOQAWDpvli /8C2qdkF8JgCuhsyw+4lgR9dQze6M9N55XIeDms/McwUQ1INUA/k0bEdW3HNBL1MIg1g Z3JGf63wpDh1gTJAy2cLbFFeYI0+7Ek9r0a2rnPqf4y25wddfUjk9DeSItzqyvs8xF3m 6jdho6XzLdiLa3/YIr6sRF3ABbdpQaFycdjQICxZJ8IdkkaPUHLZFi4/ZYNwjR40WCPM 1kgA== X-Gm-Message-State: AJcUukd7BvXilqZWrwdGciY3AxAGtKsb9DlUPjee/ds/I30OyDe6zUdG Gyviu1eYuscGEXgQH1udWoNOxgxQOuHYwiQboXTJWBfQ X-Google-Smtp-Source: ALg8bN4/c4hGQE+rIhmjshKu6tGzFwPhUjvXq7Wgn04XnIzC/3EMjJzLnef4pJXj3yPu+Xi/sptNXV77/XBwPla2fQ8= X-Received: by 2002:a63:f34b:: with SMTP id t11mr21094934pgj.341.1545878368994; Wed, 26 Dec 2018 18:39:28 -0800 (PST) MIME-Version: 1.0 References: <5C23CB7D.2050306@posteo.de> In-Reply-To: From: Gaj Kumar Date: Thu, 27 Dec 2018 08:09:17 +0530 Message-ID: To: rsgb_lf_group@blacksheep.org X-Spam-Score: 1.6 (+) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: Thanks Jacek Yes The Flybacks are a rare comodity . I have a few left from Tesla coil experiments . The PC power supplies we have in plenty and will look for the 500W > type of cores a few months back i was talking about the toroids and ferrites to some old school mates , after a month he gave me a [...] Content analysis details: (1.6 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:529 listed in] [list.dnswl.org] 1.6 SUBJ_ALL_CAPS Subject is all capitals -0.0 SPF_PASS SPF: sender matches SPF record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (bsgkumar[at]gmail.com) 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 05df7db787776cda2726d56f546a4588 Subject: Re: LF: VU2BGS Content-Type: multipart/alternative; boundary="0000000000000ccc1f057df7dbd4" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=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 --0000000000000ccc1f057df7dbd4 Content-Type: text/plain; charset="UTF-8" Thanks Jacek Yes The Flybacks are a rare comodity . I have a few left from Tesla coil experiments . The PC power supplies we have in plenty and will look for the 500W > type of cores a few months back i was talking about the toroids and ferrites to some old school mates , after a month he gave me a bag full about 20kgs of lovely ceramic toroids about 1-inch dia used in the water tap . I had to hold my laughter and thank him for the kind gift . There was a manufscturer of Tap washers who makes these Ceramic washers ! close ot his work area who gave him a bag full of these as they had small nicks and chips Yes they are working well as VHF formers !! may be useful for high voltage insulation etc . have a great day 73 Kumar On Thu, Dec 27, 2018 at 4:05 AM Jacek Lipkowski wrote: > iI forgot, old TV flyback transformers are also useful as a source of > ferrite for power applications. > > Also the HV windings on these transformers (at least from TVs made in > Poland) have 1-1.5H inductance. This gives a nice resonance at 8kHz with a > 40m longwire. Useful for receiving VLF (i've received one of Stefan's > first transmissions using this antenna), and also for transmitting (i can > receive my signal in QRSS60 at 1.2km) from my antenna. > > You can also use the transformers from old PC power supplies. They work > well at 136 and 472kHz. > > I'm sure you will find other sources of ferrite when you look around. > There is plenty of junk that can be recycled into useful amateur radio > components. Not everything has to be bought at Mouser. > > VY 73 > > Jacek / SQ5BPF > > > On Wed, 26 Dec 2018, Jacek Lipkowski wrote: > > > Date: Wed, 26 Dec 2018 23:11:11 +0100 (CET) > > From: Jacek Lipkowski > > Reply-To: rsgb_lf_group@blacksheep.org > > To: rsgb_lf_group@blacksheep.org > > Subject: Re: LF: VU2BGS > > > > Instead of ferrite rods from AM radios, search for "impeder" rods. These > are > > used for induction welding of pipes, and can stand high power at > hundreds of > > kHz. Sometimes you can get them cheap on auction sites. > > > > I use one to match my 40m longwire antenna on 630m. When tested on the > bench > > it survives 100W without problems. It also makes a nice receive antenna > (few > > of then can be stacked in a long tube). > > > > VY 73 > > > > Jacek / SQ5BPF > > > > > > On Wed, 26 Dec 2018, DK7FC wrote: > > > >> Date: Wed, 26 Dec 2018 19:42:05 +0100 > >> From: DK7FC > >> Reply-To: rsgb_lf_group@blacksheep.org > >> To: rsgb_lf_group@blacksheep.org > >> Subject: Re: LF: VU2BGS > >> > >> ...I know someone who clandestinely removed the ferrite rod of a radio > of > >> his XYL (now ex XYL) beeing able to receive the MF AM > >> broadcast. Many radios, if not to modern offer 'FM/AM' radio but AM is > not > >> used by most people. So this rod can be used to build a > >> matching unit for a 630m band antenna. And of course the core material > is > >> suitable because the antenna is used for this frequency > >> range. > >> However one has to take care that no local QRM sources are picked up > with a > >> rod. This is the disadvantage relative to a toroid of > >> course. So better place the core near the antenna, not into the shack. > >> > >> 73, Stefan > >> > >> Am 26.12.2018 17:03, schrieb Clemens Paul: > >> > >> Hi Kumar, > >> > >> >only the ferrites are a big problems here ! > >> > >> You may have a look at > >> https://www.radio-store.co.uk/ > >> > >> They ship worldwidwe,sell also small quantities and have very > >> competitive prices. > >> > >> 73 > >> Clemens > >> DL4RAJ > >> > >> > >> >-----Original Message----- > >> >From: owner-rsgb_lf_group@blacksheep.org > >> >[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Gaj > Kumar > >> >Sent: Wednesday, December 26, 2018 9:40 AM > >> >To: rsgb_lf_group@blacksheep.org > >> >Subject: Re: LF: VU2BGS > >> > >> > > --0000000000000ccc1f057df7dbd4 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Thanks Jacek

Yes The Flybacks are a rar= e comodity .
=C2=A0I have a few left from Tesla coil experiments = .

The PC power supplies we have in plenty and will= look for the 500W > type of cores=C2=A0
a few months back i w= as talking about the toroids and ferrites=C2=A0 to some old school mates ,<= /div>
after a month he gave me a bag full about 20kgs of lovely ceramic= toroids about 1-inch dia=C2=A0

used in the water = tap . I had to hold my laughter and thank him for the kind gift .
There was a manufscturer of Tap washers who makes these Ceramic washers ! = close ot his work area=C2=A0
who gave him a bag full of these as = they had small nicks and chips=C2=A0

Yes they are = working well as VHF formers !!

may be useful for h= igh voltage insulation etc .

have a great day=C2= =A0
73=C2=A0
Kumar


On Thu, Dec 27, 2018 at 4:05 AM Jacek= Lipkowski <sq5bpf@lipkowski.org= > wrote:
= iI forgot, old TV flyback transformers are also useful as a source of
ferrite for power applications.

Also the HV windings on these transformers (at least from TVs made in
Poland) have 1-1.5H inductance. This gives a nice resonance at 8kHz with a =
40m longwire. Useful for receiving VLF (i've received one of Stefan'= ;s
first transmissions using this antenna), and also for transmitting (i can <= br> receive my signal in QRSS60 at 1.2km) from my antenna.

You can also use the transformers from old PC power supplies. They work well at 136 and 472kHz.

I'm sure you will find other sources of ferrite when you look around. <= br> There is plenty of junk that can be recycled into useful amateur radio
components. Not everything has to be bought at Mouser.

VY 73

Jacek / SQ5BPF


On Wed, 26 Dec 2018, Jacek Lipkowski wrote:

> Date: Wed, 26 Dec 2018 23:11:11 +0100 (CET)
> From: Jacek Lipkowski <sq5bpf@lipkowski.org>
> Reply-To: rsgb_lf_group@blacksheep.org
> To: = rsgb_lf_group@blacksheep.org
> Subject: Re: LF: VU2BGS
>
> Instead of ferrite rods from AM radios, search for "impeder"= rods. These are
> used for induction welding of pipes, and can stand high power at hundr= eds of
> kHz. Sometimes you can get them cheap on auction sites.
>
> I use one to match my 40m longwire antenna on 630m. When tested on the= bench
> it survives 100W without problems. It also makes a nice receive antenn= a (few
> of then can be stacked in a long tube).
>
> VY 73
>
> Jacek / SQ5BPF
>
>
> On Wed, 26 Dec 2018, DK7FC wrote:
>
>> Date: Wed, 26 Dec 2018 19:42:05 +0100
>> From: DK7FC <selberdenken@posteo.de>
>> Reply-To: rsgb_lf_group@blacksheep.org
>> To: rsgb_lf_group@blacksheep.org
>> Subject: Re: LF: VU2BGS
>>
>> ...I know someone who clandestinely removed the ferrite rod of a r= adio of
>> his XYL (now ex XYL) beeing able to receive the MF AM
>> broadcast. Many radios, if not to modern offer 'FM/AM' rad= io but AM is not
>> used by most people. So this rod can be used to build a
>> matching unit for a 630m band antenna. And of course the core mate= rial is
>> suitable because the antenna is used for this frequency
>> range.
>> However one has to take care that no local QRM sources are picked = up with a
>> rod. This is the disadvantage relative to a toroid of
>> course. So better place the core near the antenna, not into the sh= ack.
>>
>> 73, Stefan
>>
>> Am 26.12.2018 17:03, schrieb Clemens Paul:
>>
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Kumar,
>>
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0>only the ferrites are a big pr= oblems here !
>>
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0You may have a look at
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0https://www.radio-store.co.uk/<= br> >>
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0They ship worldwidwe,sell also small qua= ntities and have very
>> competitive prices.
>>
>>=C2=A0 =C2=A0 =C2=A0 =C2=A073
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0Clemens
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0DL4RAJ
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0=C2=A0
>>
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0>-----Original Message-----
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0>From: owner-rsgb_lf_group@blacksheep.or= g
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0>[mailto:owner-rsgb_lf_group@blacksheep.= org] On Behalf Of Gaj Kumar
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0>Sent: Wednesday, December 26, 2018 9= :40 AM
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0>To: rsgb_lf_group@blacksheep.org
>>=C2=A0 =C2=A0 =C2=A0 =C2=A0>Subject: Re: LF: VU2BGS
>>
>>
>
--0000000000000ccc1f057df7dbd4--