"Owen Duffy" wrote in message
...

I see in the Wikipeadia entry for SWR meters the following:

"When not actually measuring VSWR, it is best to remove the ordinary type
of passive SWR meter from the line. This is because the internal diodes of
such meters can generate harmonics when transmitting, and intermodulation
products when receiving. Because active SWR meters do not usually suffer
from this effect, they can normally be left in without causing such
problems."

I dispute part of that. On receive, the diodes are not conducting, so they
won't generate IMI products. If they were a problem, then every receiver
front end in the world would be a worse problem.