[TenTec] OT Antenna Tuners

[Marinus Loewensteijn]

I have not been following the thread closely. However I disagree with the statement that the 
input unun is "just" a transformer. It is important that is understood that this is an unun where 
there is very tight coupling between input and output. Otherwise one gets a shunt L and a series 
L and that will translate the setup into a low pass T-match which will not perform with the same 
advantages. Similarly it is not an old fashioned link coupling. In the latter case the coupling is 
loose and the secondary is a tuned circuit.

Above 21 Mhz the stray capacitance becomes noticeable and together with the (for the higher 
frequencies) rather large steps of the toroid - switch (combined in one item) limit the matching
capabilities. 

I am more than happy with the performance of this ATU for coax : coax matching. It is serving
me FB.

73, Marinus, Zl2ML

_________________________________________________________________
SEEK New Zealand's #1 jobsite
http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fmsn%2Eseek%2Eco%2Enz%2FID%5FSEEKNZMAIN%5FUSR%2FPages%2Falliance%5Fhomepage%2Eascx%3FComeFrom%3Dmsnnz%26tracking%3Dsk%3Asptlmini%3Ask%3Amsnnz%3A0%3Awindowslive%3A%231&_t=757263783&_r=Seek_NZ_tagline_no1&_m=EXT