On 2007-12-28, Cecil Moore (75.23.42.181) wrote in
message


Navtex-Fan wrote:
Z = 241-j1812 Gain = -28.6 dB SWR = 278
I'm assuming that the mismatch is "solved" by the use of the 4:1 UnUn..

Nope, not necessarily. Most 4:1 designs assume a resistive
load and do not handle reactance very well. A 4:1 device
might make the problem worse.


Thanks for the reply Cecil,

Are you suggesting I should not use a unun at all?
I have also experimented with the commercial "magnetic balun" which has
a 9:1 ratio. The only difference I could tell was a _slightly_ lower
noise level.


Cheers - Dirk