[MRCA] Sincgars Spring Base resistance?

[W2HX]

Hello all,

Picked up a "spring base" that I believe is used with sincgars radios. It has the special shrouded bnc male on one end, a spring in the middle, and a thread for the AT-271 on the other end.  I have done some research on this and I am not sure if what I have is the same as what I've found on such sites as prc68.com (thanks Brooke!).  I decided to make some DC resistance measurements before trying to use it and I was very surprised at what I saw (and now I am reluctant to try the antenna base).

First, a picture:
http://www.w2hx.com/x/SpringBase/IMG_0372.JPG

looks fairly standard - except the numbering on it seems unique, and not something I've found on the web. The number is:  80063ASSYA3256530-1 which I would be tempted to abbreviate to A3256530-1.  I connected a BCN barrel (f-f) and measured from center to shield as about 7.5 ohms.  Also, dc resistance from center conductor (bnc) to where the AT-271 attaches was also about 7.5 ohms.  I was surprised to see this. I would have expected open circuit from center to shield and 0 ohms from center bnc to at-271.

Anyone have one of these bases (confirmed working) that can also check this? I don't know whether some DC path is used by these radios to signal the radio to its presence, or whether I have a defective unit.  If defective, then it might be a short at RF which would not be good.  Anyone's thoughts here?

Some other pix:
http://www.w2hx.com/x/SpringBase/

thanks!
 
73 Eugene W2HX