Hello Paul,


I'd like to see what this new dummy load I just bought on e-bay looks
like under test at its purported frequency limit of one Gig.
Problem is, all the documentation I have for my VNA shows devices to be

tested having *two* connectors (an 'in' and an 'out' if you will) like
filters for example. I can only connect to the *one* connection that
dummy loads typically have, since it'a a termination device rather than

a through one like a filter or attenuator. Does that mean I can't
analyse its
characteristics? Or is there a work around/special cable configuration
that would solve
this problem?


A quick and dirty one would be to use a resistor from VNA-out to dummy
load, then another from dummy load to VNA-in. 50 ohms or less. With next
to nothing reactive, of course. All nicely RF fashioned, chip resistors
maybe. It's not going to be matched but you can have the analyzer do the
math to calculate out the dummy load. Mind the power limits.

Sometimes I do this with an HP resistive splitter when the impedance
analyzer is down (like it is right now, again....%*&#!!).

Regards, Joerg

http://www.analogconsultants.com