Eric,

Thanks so much for following up with Zaon. Kudos to Zaon for being
forthcoming with you, too. I love my MRX, and the attitude Zaon
expressed in answering you makes me like the company that much more.

By the way, I think there's a typo in your reply regarding minimum
detectable distance - I think you meant to say 0.1 mi, not 0.4 mi.

-John

On Mar 14, 8:39 pm, Eric Greenwell wrote:

Eric Greenwell found in the
manual for the Zaon MRX that this was about 0.4 miles.

Not quite: 0.4 mi

John's analysis seemed plausible, so I contacted Zaon about it.
Summarizing a fairly technical reply:

"The situation described can produce a dead zone. Generally it is not a
problem in practice, because there are many other interrogation sources
(mainly other ATC radars and TCAS systems) that interrogate transponders
besides the ATC radar in line with your glider and the other aircraft.
These replies will not be masked, so range and altitude can be
determined by the MRX."