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 wBR8CW5V007585 for ; Thu, 27 Dec 2018 09:12:39 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1gcQec-0001ab-Qd for rs_out_1@blacksheep.org; Thu, 27 Dec 2018 08:04:30 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1gcQc4-0001aA-Of for rsgb_lf_group@blacksheep.org; Thu, 27 Dec 2018 08:01:52 +0000 Received: from smtp1web.tin.it ([212.216.176.195]) by relay1.thorcom.net with esmtp (Exim 4.91_59-0488984) (envelope-from ) id 1gcQby-0000LR-Vj for rsgb_lf_group@blacksheep.org; Thu, 27 Dec 2018 08:01:51 +0000 Received: from feu3 (10.192.64.13) by smtp1web.tin.it (8.6.060.43) id 5AB0B63D07134AE7 for rsgb_lf_group@blacksheep.org; Thu, 27 Dec 2018 09:01:43 +0100 Received: from (95.249.73.43) by webmailtin.pc.tim.it; Thu, 27 Dec 2018 09:01:43 +0100 Message-ID: <167eeaef6ca.marcocadeddu@tin.it> Date: Thu, 27 Dec 2018 09:01:43 +0100 (CET) From: "marcocadeddu@tin.it" To: Mime-Version: 1.0 X-Originating-IP: 95.249.73.43:1243 X-Spam-Score: 0.0 (/) 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: Hi Kumar, yes often goods shipped from PRC are shipped as "private" postal pack and skip the standard custome procedures.. I don't know if it is a good idea to place the TX-RX close to the loading coil at the base of the antenna: coax losses are very low at MF/LF and loading coils, because of their high inductance (at lea [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [212.216.176.195 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (marcocadeddu[at]tin.it) 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 640db27bf4e79f20c339a3df4106c3a6 Subject: R: Re: Re: LF: VU2BGS Content-Type: multipart/alternative; boundary="----=_Part_10324_29496478.1545897703118" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_20_30,HTML_FONTCOLOR_BLUE, 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 ------=_Part_10324_29496478.1545897703118 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi Kumar, yes often goods shipped from PRC are shipped as "private" postal pack and s= kip the standard custome procedures.. I don't know if it is a good idea to place the TX-RX close to the loading c= oil at the base of the antenna: coax losses are very low at MF/LF and loadi= ng coils, because of their high inductance (at least on LF), develop high v= oltage and high fields so I guess it is better to match the antenna and run= the coax to the shack. Depending on the ground properties you have to be faced on feedback in the = audio cables feeding the PC so on these bands is probably better keep audio= cables instead of antenna cables short! In these application probably you = will enjoy those lossy ferrites you got :-) I do agree with you: NOISE is the biggest problem city hams have to fight! A lot a small devil boxes emitting low frequencies are around :-( and if no= thing changed since I visited part of VU mains distribution is often made w= ith aerial lines (I mean the low tension not the HV) and this allow easy pi= ck-up and redistribution of electrical noise... If you have fixed direction and frequency of noise sources a phase shift ca= ncellation as you mentioned could help, but when working modes like wspr or= low speed CW (QRSS) could be frustrating fight noise for 15-30 minutes. But will not bore you any longer :-)) you will discover by yourself all tho= se goodies and will try the best way to live with it! :-)) HNY Kumar Marco, IK1HSS=20 ----Messaggio originale---- Da: bsgkumar@gmail.com Data: 27-dic-2018 4.05 A: Ogg: Re: Re: LF: VU2BGS Hi Marko=20 I fully agree with some of the product from china .I got a function Gen fro= m Feeltech goes up to 60Mhz , idea was to use it as LF TX and LO for RX etc= .\It came thru the customs easily . but a smaller package with cables an= d tuner components from LZ I was charge 57 % .now find any thing non chine= se is taxed heavily !!Yes i will do and already have 8Inch dia drain pipes= 10 feet long for the Low band coils .!The idea was to built the TX and RX= also in the tubes and have only the AUdio in /out coming from the antenna = base .I built a 4 feet coil with 6mm copper tubes for my 160m vertical wil= l send you pics so I am armed for the battle , now the biggest is the noise= !! The momenr i hear the first Stn I am on the next stage of Txmit . Thanks for the fine encouragents=20 CU on the bands 73 Kumar On Thu, Dec 27, 2018 at 2:19 AM marcocadeddu@tin.it w= rote: Dear Kumar, it is a sad history.. it is a long time that here in EU (but I guess also e= lsewhere) we are dealing with incredible low prices of chinese products... = sometime I read on e-bay or similar platforms goods offered to a price, inc= luded freight, lower of the shipping price alone (from Italy). Some items are good or at least good enough for the purpose others lack for= some feature.. It is an hard world! :-D By the way concerning ferrites and iron dust cores properties will suggest = to download a software called "mini ring core calculator" just google these= four words and you get plenty of possible download. The software provide calculation of inductance for cores made from Amidon, = TDK and Ferrox. The other longer way is to download catalogues or data sheets from the prod= ucers or from the web pages of sellers like digikey, mouser etc. P.S. please do not use ferrite cores for the base loading coil of your (ex)= top band vertical!! wind a large huge coil on suitable cores like pvc drai= ning pipes. Don't worry with 14m vertical and some top load the coil is not so big :-) = - after all this will a training for 137 kHz winding, and if you will follo= w Stefan... for larger and larger loading coils for VLF! We all hope to hear good news from you soon Namast=C3=A9 Marco, IK1HSS ----Messaggio originale---- Da: bsgkumar@gmail.com Data: 26-dic-2018 17.14 A: Ogg: Re: LF: VU2BGS Dear Clemens Thanks for the kind suggestion I will look it up .does any one= have some kind of Material and equivalent table . I find the post offices are charging exorbitant duties , Yesterday i paid = 57 %=20 while chinese goods come in easily with lower pricing !! . I presume there = would be some chinese companies making toroids . Thanks again Best regards Kumar On Wed, Dec 26, 2018 at 9:37 PM Clemens Paul wrote: 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 p= rices. 73 Clemens DL4RAJ=20 =20 >-----Original Message----- >From: owner-rsgb_lf_group@blacksheep.org=20 >[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 ------=_Part_10324_29496478.1545897703118 Content-Type: text/html;charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Kumar,

yes often goods shipped from PRC are shipped as "private" = postal pack and skip the standard custome procedures..

I don't know = if it is a good idea to place the TX-RX close to the loading coil at the ba= se of the antenna: coax losses are very low at MF/LF and loading coils, bec= ause of their high inductance (at least on LF), develop high voltage and hi= gh fields so I guess it is better to match the antenna and run the coax to = the shack.
Depending on the ground properties you have to be faced on fe= edback in the audio cables feeding the PC so on these bands is probably bet= ter keep audio cables instead of antenna cables short! In these application= probably you will enjoy those lossy ferrites you got :-)

I do agree= with you: NOISE is the biggest problem city hams have to fight!
A lot a= small devil boxes emitting low frequencies are around :-( and if nothing c= hanged since I visited part of VU mains distribution is often made with aer= ial lines (I mean the low tension not the HV) and this allow easy pick-up a= nd redistribution of electrical noise...
If you have fixed direction and= frequency of noise sources a phase shift cancellation as you mentioned cou= ld help, but when working modes like wspr or low speed CW (QRSS) could be f= rustrating fight noise for 15-30 minutes.

But will not bore you any = longer :-)) you will discover by yourself all those goodies and will try th= e best way to live with it! :-))

HNY Kumar

Marco, IK1HSS

----Messaggio originale----
Da: bsgkumar@gmail.com
Data: 27-dic-2018 4.05
A: <rsgb_lf_group@blacksheep.org>
Ogg: Re: Re: LF: VU2BGS

Hi Marko 

I fully agree with some = of the product from china .
I got a function Gen from Feeltech go= es up to 60Mhz , idea was to use it as LF TX and LO for RX etc .\
It came thru the customs easily .  but  a smaller package with c= ables and tuner components from LZ I was charge 57 % .
now  = find any thing non chinese is taxed heavily !!
Yes i will do and = already have 8Inch dia  drain pipes  10 feet long for the Low ban= d coils .!
The idea was to built the TX and RX also in the tubes = and have only the AUdio in /out coming from the antenna base .
I = built a 4 feet coil  with 6mm copper tubes for my 160m vertical will s= end you pics 
so I am armed for the battle , now the biggest= is the noise !!  The momenr i hear the first Stn I am on the next sta= ge of Txmit .

Thanks for the fine encouragents&nbs= p;

CU on the bands 
73 
<= div>Kumar


On Thu, Dec 27, 2018 at 2:19 AM marcocadeddu@tin.it <mar= cocadeddu@tin.it> wrote:
Dear Kumar,

it is a sad history.. it is a long time = that here in EU (but I guess also elsewhere) we are dealing with incredible= low prices of chinese products... sometime I read on e-bay or similar plat= forms goods offered to a price, included freight, lower of the shipping pri= ce alone (from Italy).
Some items are good or at least good enough for t= he purpose others lack for some feature..
It is an hard world! :-D
By= the way concerning ferrites and iron dust cores properties will suggest to= download a software called "mini ring core calculator" just google these f= our words and you get plenty of possible download.
The software provide = calculation of inductance for cores made from Amidon, TDK and Ferrox.
Th= e other longer way is to download catalogues or data sheets from the produc= ers or from the web pages of sellers like digikey, mouser etc.

P.S. = please do not use ferrite cores for the base loading coil of your (ex) top = band vertical!! wind a large huge coil on suitable cores like pvc draining = pipes.
Don't worry with 14m vertical and some top load the coil is not s= o big :-) - after all this will a training for 137 kHz winding, and if you = will follow Stefan... for larger and larger loading coils for VLF!

W= e all hope to hear good news from you soon

Namast=C3=A9
Marco, IK= 1HSS

----Messaggio originale----
Da: bsgkumar@gmail.= com
Data: 26-dic-2018 17.14
A: <rs= gb_lf_group@blacksheep.org>
Ogg: Re: LF: VU2BGS


Dear Clemens 
Thanks for the kind = suggestion I will look it up .
does any one have some kind of Mat= erial and equivalent table .

I find the post offic= es are charging  exorbitant duties , Yesterday i paid 57 % 
=

while chinese goods come in easily with lower pricing != !
 . I presume there would be some chinese companies making = toroids .

Thanks again 
Best regard= s 
Kumar



On Wed, Dec 26, 2018 at 9:37 PM Cleme= ns Paul <cpaul@gmx.ne= t> wrote:

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 sm= all quantities and have very competitive prices.

73
Clemens
DL4RAJ
 

>-----Original Message-----
>From: owner-rsgb_lf_group@black= sheep.org
>[mailto:owner-rsgb_lf_group@blac= ksheep.org] On= Behalf Of Gaj Kumar
>Sent: Wednesday, December 26= , 2018 9:40 AM
>To: rsgb_lf_group@blacksheep.org<= /font>
>Subject: Re: LF: VU2BGS





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