B40 rf interference problem

On Sat, 12 Mar 2005 12:50:43 -0800, Eric Greenwell wrote:

John wrote:
SWR measured 1.25 and ~38 ohms at 123 Mhz. I connected the instrument
directly to the antenna using the bnc that gets connected to the radio.

An SWR of 1.25 is nearly perfect, but where did the 38 ohms number come
from? I've not seen an SWR meter that shows the antenna impedance, which
is normally 50 ohms at 123 mhz. Was the ohms measurement with an ohmmeter?

Does this also prove the bnc conenctor is good or do I need to
disassemble it?

Let's hear where the 38 ohm number came from, first!

Eric,
38 ohms is probably what the SWR meter showed. It is about the
impedance which would give a 1.25 SWR in a 50 ohm system.
I haven't done the math, but from a couple of charts, that's what I
would assume.
Cheers, John G.