John, now that I have thought about your graph a little bit, it seems clear the primary needs more inductance.
To be flat down to 200kHz, I 'think' it would need about 160uh.
That would be 168 turns on that core.
?Was the point of your graph to show that the transformer needs more work? Maybe a different core, maybe ferrite instead of iron?
Does anyone have a picture of the HP 4342A transformer?
?I added a schematic picture of the section about the HP 4342A transformer. 50 to 1, has a 1 turn, 0.1¦¸ secondary output impedance, and is flat from 10kHz to 70 MHz.
?My understanding is a 50 to 1 turns ratio is a 2500 to 1 impedance ratio, so 0.1 x 2500 = 250¦¸ input impedance. Is this at 10kHz???
The resistor across the primary is 75 ohms.? Yes, I'm confused by it all.
????????????????????????????????????????????????? Mikek
