[TowerTalk] 22 ohms to 50 Ohms balun material

[Tom Anderson]

Jim:

Thanks for the information.  I'm forwarding it on to Daniel, ZS6JR in SA 
and I'll let him tell me what he wants me to get here in the states and 
ship to him in SA.  Daniel repairs Collins gear in SA and has a very 
complete test lab in his home.  I got the guided tour when I was on the 
C9 DXpedition in June and July.  Daniel was our tech person who kept 
everything running right in Mozambique and he had several footlockers 
full of parts, etc.

Everyone on towertalk.com has been especially helpful on this question.  

Tom, WW5L/C91TL

Jim Brown wrote:

>On Mon, 07 Aug 2006 18:19:19 -0500, Tom Anderson wrote:
>
>  
>
>>what type of ferrite material is needed to construct thisa type 
>>of balun? 
>>    
>>
>
>For a balun of this type, what matters most is LOSS, not 
>permeability. I would use a Fair-Rite #61 material, which has the 
>lowest loss of any good material I know of. This is the material 
>commonly sold in the ham market as FT240-61. For high power, I would 
>use at least two of them, as is done in the TenTec 229 and 238 
>tuners. Done this way, you'll get more flux for the same number of 
>turns, and the heat will be divided between the two of them. 
>
>Jim Brown K9YC
>
>
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