[NLRS] Looking for RF transformer

[Dan Larson]

Oh, sorry, I forgot to mention, that with two-hole
balun cores, each turn must pass through both holes.

With a torroid core each turn passes trough the center 
only once. 

That is why you can get half-turns with a two-hole 
balun core. (they really *do* look like pig snouts!)

Dan KC0LUY

On Wed, 27 Oct 2004 11:58:09 -0500, Dan Larson wrote:

>You can come very close by winding a transformer
>with separate primary and secondary on a Type 43
>torroid core or balun core (sometimes called a 
>"pig snout")
>
>Use 10 turns for the 50-ohm primary, and 12 turns
>for the 75-ohm secondary. The impedance ratio is 
>the square of the turns ratio of the primary to 
>secondary. In this case 10t:12t will yield 50ohm:72ohm
>which is probably close enough. If you use a two
>hole balun core (pig snout) then you can wind with
>a ratio of 10t:12.5t to get 50ohm:74.4ohm.
>
>Hope this helps.
>
>Dan KC0LUY
>
>On Wed, 27 Oct 2004 10:57:40 -0500, Jason Godfrey wrote:
>
>>Hello.
>>
>>This is not for a ham radio application, but I thought NLRS may be a good 
>>source for what I am looking for.
>>
>>I need an RF transformer to go from 50 ohms to a 75 ohm load. The transformer
>>needs to be good to 100 Mhz, handle around 30 watts full duty cycle, and have
>>low Q (good bandwidth.) 
>>
>>If anyone has one to sell or knows where I could find such a beast, please let
>>me know.
>>
>>Thanks
>>- Jason, N0RPM
>>_______________________________________________
>>NLRS mailing list
>>NLRS at mailman.qth.net
>>http://mailman.qth.net/mailman/listinfo/nlrs
>
>
>