Jim Brown wrote:
> 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!
>
I don't know about you, but I want a lot of head room when running a KW
when I get near the band edges. I've blown out more than one balun
albeit, never a choke balun. <:-))
73
Roger (K8RI)
> 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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