Re: Rf in the shack distorting audio - the results
Posted by
Bob Nielsen on
Feb 23, 2007; 5:39pm
URL: http://elecraft.85.s1.nabble.com/Rf-in-the-shack-distorting-audio-tp443216p443221.html
On Feb 23, 2007, at 9:29 AM, Darrell Bellerive wrote:
> On February 22, 2007 09:44 am, Don Wilhelm wrote:
>> Look at the Elecraft BL2 for a switchable 1:1/4:1 balun, it will
>> handle up
>> to 250 watts. If you do not need the switchable arrangement, the
>> BL1 can
>> be constructed for either a 1:1 or a 4:1 configuration and its
>> power rating
>> is 150 watts. A convenient ground lug is located on the balun
>> output side.
>
> How can a balun be switchable from 1:1 or 4:1? Surely the
> characteristic
> impedance of the windings will be missmatched at one of the settings.
Actually the characteristic impedance of the windings will ideally be
2*Z0. For a 1:1 balun they will appear in parallel, while for 4:1
they will appear to be in parallel at one port and in series at the
other.
Bob, N7XY
_______________________________________________
Elecraft mailing list
Post to:
[hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help:
http://mailman.qth.net/subscribers.htmElecraft web page:
http://www.elecraft.com