Only consider the ZM-30 if you don't mind sending it back to Ohio after
every second use. It has a bad problem with static electricity
charges. Despite scrupulous efforts to ensure I had no static charges
on anything it touched, it would still blow the diodes on its board. It
did that once while just checking a four ft length of coax. Paul
finally sent me a new unit altogether, but I sold it on eBay. I spent
about 50% of the purchase price on shipping charges before it left for
good.
I bought an MFJ and have been very happy with it. Prior to selling the
new ZM, I compared them side by side. The numbers were a dead heat.
What I really like about the MFJ are the analog meters - they really
help you see what's happening to the resistance and SWR on your line as
you vary the frequency.
The only thing I miss from the ZM is the signal generator feature. (It
was also easier to set on an exact freq - the MFJ is a bit twitchy.)
Bob Bogash
W7DDD
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