[R-390] Identified: R-390A mini BNC connector type

[Tisha Hayes]

I finally found out what the mini BNC connectors on the R-390A are
designated as. This has been a question asked by many on the R-390A
reflectors and on the Hollow State News, no answer was readily apparent.

Since I have a large amount of coaxial inter-series adapters as part of my
professional work, I decided to pursue an answer to this question through
the Amphenol tech-rep. Here is what I found out;

The series connector is designated as MB. It is not rated for a specific
impedance like 50 or 75 ohms. The specification has a wide variety of
impedance's that the connector will work with, ranging from 50 to 150 ohms.
I also found that the connector, chassis plug, Tee's and terminators are
still available through a variety of sources. Since this is a little-known
specification without any widespread knowledge of it's applications the
parts are available cheaply from some surplus sites. At the higher end,
there are still suppliers who can make custom cables with the MB connector.

One surplus site that has the connectors is Surplus Sales of Nebraska. Of
course, their prices are on the high end of what is considered surplus but
they have a decent array of connectors. This can be found at
http://www.surplussales.com/Connectors/MB.html

These are a direct fit and I have purchased connectors and tested them on my
R-390A. This may be a great tip on rebuilding the R-390A when the coax
cables are seriously deteriorated or when connectors are badly corroded.

Tisha

Factory certified interoceter repair center.
"Remember, use only genuine interoceter parts."
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