On Mon, 27 Apr 2009 23:17:13 +0300, Kostas SV1DPI wrote:
>I want to buy a rather large quantity of ferrites
>I need clampon No 2631164181 abt 100 pieces
>i need also 2631102002 abt 30 pieces
>and also 5943003801 or 2631803802 (abt 30 pieces)
>By the way is 2631803802 suitable to make baluns?
Yes, these are the best parts I know of for HF chokes. Note that these parts
are NOT suitable for use as transformers -- too much loss -- but they are
ideal for common mode chokes.
If not what ferrites and
>how many of them must i use to make a 1:1 balun capable for 2-3kwatts?
2-3kW? Is someone cheating on the rules? If you want to cheat, do your own
designs and stay out of contests and DXing!
My chokes are designed for 1.5kW. See my "Choke Cookbook" in
http://audiosystemsgroup.com/RFI-Ham.pdf Note that #43 material is as good or
slightly better ABOVE 5 MHz. #31 is much better on 80M and below.
>I sent an email to lodestone but i had no reply.
>Do you know where to buy them for a cheaper price or is there anyone to help
>to buy them and send to me in Greece?
Everything I know about buying them is in Appendix One of the latest version
of the tutorial. Make sure you get it directly from my website to get the
latest. I don't know if any of those vendors do business outside the US.
Fair-Rite has distributors worldwide. See their website for listings and
links.
73,
Jim Brown K9YC
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