[NLRS] Looking for RF transformer

[James Klassen]

Hi, I was also looking for an RF transformer, but for 222MHz. What I was
wondering is where is a good source for the balun/torroid cores?

Jim Klassen
KB0UAZ

On 27 Oct 2004, Dan Larson wrote:
> 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
> >
> >
> >
> 
> 
> 
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> 
James Klassen