Yes that is right. The impedance of a delta loop is 100 ohms at resonance.
A lambda/4 matching section of 75 Ohm cable will give close to a 1:1 VSWR
into 50 Ohms.. The Formula to calculate the 1/4 wave matching section
impedance (Zm) is:
Zm =Square root of Z1*Z2 where Z1 is 50 Ohms and Z2 is the load impedance.
If you do the calculation you will see that the section actually needs to be
70.7 Ohms, so 75 Ohm cable is the nearest "real world" coax most of us can
get.
72 de G8BOU/VE3CHH
--
FAQ on WWW: http://www.contesting.com/antennaware-faq.html
Submissions: antennaware@contesting.com
Administrative requests: antennaware-REQUEST@contesting.com
Problems: owner-antennaware@contesting.com
|