Transformer materials (43, 61, 73) for RX antennas

   I have decided to order and measure 9:1 transformets for beverage and K9AY antennas. There are still some questions about the ferrite materials - loss vs SWR. I already have got 43, 61 and 73 materials. Please have a look at the results. Material 61 is not working on low bands. (?) Than 43 and 73 are both fine for these RX applications. 

   Insertion loss is better than 0,3 dB for -43 material and better than 0,2dB for -73 material on low bands. These materials has opposit insertion loss curves. Material -43 has got lower loss on higher bands and -73 has got higher loss on the higher bands. See the pictures. Anyway I think, that these values of insertion loss are  not important anyway.

S11 and SWR 470 / 50 Ohms on BN43-202

 S11 and SWR 470 / 50 Ohms on BN61-202

 S11 and SWR 470 / 50 Ohms on BN73-202

Insertion loss for TWO transformers in serieson BN43-202 (devide by 2)

 Insertion loss for TWO transformers in serieson BN73-202 (devide by 2)