According to the T30-17 data sheet tolerance for AL is +/- 5%.
From my L measurement the tolerance seems to be at least +25 %.
Any idea?
Here are some attenuation values (all in dB, LP for 12/10 m):
v1: Simulation with L values from manual
v2: Simulation with found L values for original winding
v3: measured attenuation values for original winding
v4: measured attenuation values for reduced winding
?? f/MHz? 24.9???? 28.5???? 49.8???? 57.0 ??? 74.7???? 85.5
v1??????? 0??????? 0??????? 23?????? 31.1???? 55.1???? 56.3
v2??????? 1??????? 4??????? 37.2???? 49.1???? 51.5???? 50.2
v3??????? 0.2????? 1.8????? 37.6???? 51.7???? 55.9???? 54.9
v4??????? 0??????? 0.2????? 25.4???? 36.2???? 63.0???? 55.5
There seems to be only one critical value for v3: 1.8 dB @ 28.5 MHz. It would reduce output to around 70 % compared to v4.
Especially for the first four frequencies the values from version 1 and 4 and from version 2 and 3 are similar.
So I guess my L measurement is not wrong.
73 Ludwig
