Uncle Peter wrote:

Guys

I'm looking for a formula, or preferably a program, that will let me design
a matching pad that will let me set Z1, z2, and the dB loss. I have the
formulas for the minimum loss pads, but they would require a second
fixed attenuator to set the dB loss to the -20dB I desire. I'm looking to
build some 50 ohm to various higher impedances for use on my signal
generators to match the higher impedances found on boatanchors, etc.

Or, would it just be easier to use a minimum loss pad with a second
symetrical pad to get the desired loss?

Pete


What frequencies and impedance ratios? I like to use RF transformers
with half the attenuation on each side to insure the proper levels and
isolation.

The first ones I wound were on the six hole ferrites for 50 Ohms one
on side, and 75 Ohms on the other. By tapping it at five turns you get a
1.2 -1.0 turn ratio, or, 1.2 * 1.2 * 50 = 70 ohms. Toroids are better
for some ratios and frequencies.

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida