[Milsurplus] BC-669 connector

[Jim Whartenby]

Mike, long time, no "see"!All you say is true if one has a milling machine with all of the bells and whistles that you would need.  My drill press is certainly not up to this task.  
Considering setup time and such, perhaps the time needed to widen three holes with a Swiss file versus machining would be a wash.
Ever find the time to make that mount for your ARC-65?Regards,Jim
Logic is a systematic method of coming to the wrong conclusion with confidence.  Murphy

On Friday, November 6, 2026 at 12:28:16 PM CST, Michael Hanz <aaf-radio-1 at aafradio.org> wrote:

  
Sorry, that ought to be a #1 center drill.  My brain went south for a minute there.
 On 11/6/2026 1:09 PM, Michael Hanz via Milsurplus wrote:
  
 
With a tapered file, lots of effort.  
 
With a #3 center drill, you can drill out the smaller hole and leave it with the correct .125" sleeve size for the connector pin.  Use lots of lubricant.  More importantly, it will maintain the center location of the original hole, a process that is almost impossible using a tapered file.  (I've tried...)
 

 73,
 Mike KC4TOS 
  On 11/6/2026 3:10 AM, Jim Whartenby via Milsurplus wrote:
  
 Robert How much effort do you think would be required to open up those three #16 contacts in a 28-8P connector to accept #12 contacts using a tapered Swiss file?  A half day's work versus patiently waiting for a couple of years seems worthwhile, doesn't it? Regards, Jim 
   Logic is a systematic method of coming to the wrong conclusion with confidence.  Murphy  
  
  On Thursday, November 5, 2026 at 07:43:14 PM CST, Robert Goff <robert.h.goff at gmail.com> wrote: 
 
  Seems like this subject comes up every few years.
  Here is Robert Down's response to me back in 2012:
  ________________________________
  
  Sorry, but the connectors are NOT AN 3108-28-8S or P.  They are actually AN
  3108-28-767S or P.  Which were custom modified from the 28-8.  That's why
  they are so difficult to find.  Amphenol does not appear to have actually
  made any -28-767 inserts.  To add to the confusion, most if not all of the
  modified inserts that I have seen still have -8 molded into the face.  The -767
  was only marked on the barrel (and not on all of them, either).  The
  difference is that the 28-8 has 10 #16 and 2 #12 contacts.  The 28-767
  has 5 #12.
  three of the holes for the #16 (A,B,C) were bored out for #12.
  
  
  I think Bill Perry has been sold out of the proper connector for at
  least 15 years. I finally did find an original cable just by patiently
  watching ebay. It took a couple years and shipping from Italy, but I
  got it.
  Good Searching,
  73,
  de Robert W7MKA
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