Sorry about that. It's PI shaped. The 3.9k is in series tip to tip.
One 2.k to ground before it and one 2.2k to ground after it.

I ran it for 1M ohm and 10M ohm input impedance and got the same
answer, but I didn't figure in the output impedance. The output
impedance is 1K ohm. The way I was looking at it, the output impedance
didn't seem to matter as far as the amount of attenuation. Guess I need
to look again.

Jim Gregory wrote:
Need to know source and load nominal impedances to work it out.
Is the r/h 2k2 supposed to be to the right of the 3k9 resistor? In
OE6 it
does not look right.

"apa" wrote in message
oups.com...
I was looking though the manual for an Elextrix Repeater and toward
the
end it has a diagram for building a 12dB attenuation cable for
plugging
it into a guitar amp. It's three resistors arranged like this:


tip-------------3.9k----------tip
| |
2.2k 2.2k
| |
sleeve------------------------sleeve


From my math, this gives about -8.9dB, not -12dB.
My math's not very good though. Could someone just confirm that I'm
wrong so I can go back and look for my mistake(s)?

Thanks