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 platforms goods offered to a price, included 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 producers 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 so 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!

We all hope to hear good news from you soon

Namasté
Marco, IK1HSS

----Messaggio originale----
Da: [email protected]
Data: 26-dic-2018 17.14
A: <[email protected]>
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 % 

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 <[email protected]> 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 prices.

73
Clemens
DL4RAJ
 

>-----Original Message-----
>From: [email protected]
>[mailto:[email protected]] On Behalf Of Gaj Kumar
>Sent: Wednesday, December 26, 2018 9:40 AM
>To: [email protected]
>Subject: Re: LF: VU2BGS