Re: KAT500 update
Posted by
Eric Swartz - WA6HHQ on
Dec 08, 2011; 11:28pm
URL: http://elecraft.85.s1.nabble.com/KAT500-update-tp7072932p7076330.html
Hi Ignacy,
This is a common misconception. (One which I held until recently. :-) It
turns out there is no advantage to placing the balun at the input of the
L-Network tuner. Since one end of the balun is grounded by the input to
the tuner, it is still presented with the same stresses under high SWR
situations. Baluns at the input and output both drive balanced loads
equally well.
We've now put together a web page describing the impact of placing the
balun at the input or at the output of a L-Network tuner. See:
http://www.elecraft.com/KAT500/input_versus_output_balun.htmAt the bottom of that page are several links providing detailed
technical analysis of these configurations. The first two, by W8JI and
W7EL are very clear discussions of this issue.
73, Eric WA6HHQ
www.elecraft.com
On 12/8/2011 3:17 PM, Ignacy wrote:
> It seems to me that the story is more complex than it sounds.
>
> The input balun always works at low SWR and at 50 Ohm. It is very easy to
> have such balun. A small balun would easily handle a KW without heating.
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