[ARC5] Need source for ARC 9121 control plug on MD-7

[WA5CAB at cs.com]

I'll add about three comments to what Mike has written.

1) The BC-451-A can be easily modified to function in place of the 
C-29/ARC-5 by making only three changes.  
     a)  Remove the wire from J55 Pin 6.
     b)  Disconnect the common terminals of S52 from Ground (chassis).
     c)  Connect Pin 6 to the common terminals of J55.
After doing that, the BC-451-A will function in place of a C-29, plus if 
the pins in the PL-153-(*) and the 9585/6962 are connected  1 to 1, 2 to 2, 
etc. the Mic and Key jacks will be active.  Note that contacts 5 are not used.

2)  Converting a PL-153-A or PL-153 to a 9585 or a 6962 is probably doable 
as it only involves moving one contact..  But a simpler solution is to start 
with a different connector.  There are at least three slightly different 
19-socket connectors used in various A.R.C. Type 12 installations, 12139, 
14320 and 16115.  They can be converted to have a compatible 18-socket insert to 
replace the 6962 or 9585 by simply grinding off the alignment key and 
plugging Socket M (Type 12 connector contacts are lettered instead of numbered).  
Note however that all of the Type 12 connectors have a back shell with a 
rubber grommet in the center.  They can be fairly easily converted to accept 
the cable gland but converting them to look like the open-wire types would be 
considerable work.

3)  However, the 9589 or 9377 12-socket connector is another matter.  
First, at most only one socket in the PL-154-(*) is in the same relative location 
as a socket in the 9589 or 9377.  So converting it wouldn't be practical.  
Contacts 1 through 7 on the ARC-5 rack are in the same relative positions as 
4 through 11 in the PL-153-(*).  Contact 8 may be in the same position as 
15 in the PL-153-(*).  But I don't think that the remaining four line up with 
any existing ones.  If they did, you might be able to plug a 9585/6962 into 
the 12-pin connector on a transmitter rack.  And probably a PL-153-(*).  
Which would have been a big no-no.  Unfortunately, the 12-socket connectors 
used with the Type 12 have a smaller diameter shell and insert.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 04/08/2017 11:36:06 AM Central Daylight Time, 
kk5f at earthlink.net writes: 
> Some have discussed modifying the common PL-153-A to the 9585, and the 
> common PL-154-A to the 9589, but I know of no one who has done that.  I 
> believe it would be harder than you think.
> 
> 
> Good luck...good hunting!
> 
> 
> Mike / KK5F
> 
> 
> 
> 
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