[Collins] EV-664.

[Dr. Gerald N. Johnson]

On Wed, 2007-08-29 at 18:50 -0700, Glen Zook wrote:
> I don't know if the connector is exactly the same as
> Motorola used for decades (including the Motrac and
> Motran series).  There were actually several
> variations of this connector used by Motorola, General
> Elecric, and several other companies.  The difference
> is in the position of the alignment "slot".  The
> version used by Motorola had a pin directly "in line"
> with the "slot" and the version used by General
> Electric had this pin offset by about 15 degrees from
> the slot.  
> 
> Now 3 of the pins are equally spaced but the 4th pin,
> the one nearest the slot, is slightly farther apart
> from the 2 adjacent pins.
> 
> There is a retaining flat-head alignment screw that
> holds the plastic insulator in alignment which goes
> through the metal housing of the connector.  This is
> drilled in different places depending on the
> manufacturer making the radio.  If the alignment is
> not correct you can remove this screw and turn the
> inner assembly so that it will mate with the female
> socket.  However, the plastic will be loose inside the
> metal housing and you do have to be careful when
> removing the plug because the pin assembly will remain
> in the socket when the metal housing is removed.
> 
> Motorola and General Electric had this slightly
> different arrangement on their microphones to make it
> harder to use the same microphone on both brands of
> equipment.  Federal Signal Corporation, the
> manufacturer of emergency lights, sirens, etc.,
> sometimes used the same 4-pin connector with an even
> different rotation in regards to the alignment slot. 
> Again, this was to "force" the end user into using
> microphones sold by that company.

Yes that key orientation is the way to customize the connector, done to
many circular connectors, military and civilian.
> 
> Again, any of the various versions of the 4-pin
> connector can be used "in a pinch".  But, depending on
> the actual style the retaining screw may have to be
> omitted.

Or the locating key squeezed back into line with the shell it was cut
from, and then depending on the pins for orientation. I believe that the
standard connector is what fits the 664 and what I used. EV had their
own smoother looking connector too, which may have had gold plated pins.
I just checked my EV-644 and the standard Amphenol key fits the EV-664
slot.
> 
> By the way, Johnson used another variation of this
> connector for the bias switching connection on the
> Thunderbolt linear amplifier.
> 
> Glen, K9STH

-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer