[GreenKeys] M28 to M14 TD adapter

[Roy Morgan]

On Jan 15, 2016, at 11:27 AM, Nick England <navy.radio at gmail.com> wrote:

> I have a unit with a base for a 28TD and motor (LXDB) sitting on an adapter that turns it into a M14 base. ...
> What do these contacts fit?

Nick,

There is a base unit that would be bolted to the table that accepts the bottom most plate of the thing you show, and had the mating sliding contacts shown in your second picture.  The base was fitted with some sort of switch that closed the loop contacts when you took the T/D out, so that the loop in which the T/D was operating would continue to be continuous.

If a T/D was malfunctioning or was due for service, it would take only seconds to remove it and replace it with another one.  I am pretty sure that the line closing contacts were arranged so that the loop was never open even during removal or installation of the T/D.   (Looping jacks in patch panels do this.) The pictures I have here of Model 14 T/Ds show a finger hold place at the very bottom of the tape end that lets you get a good grip on the machine, lift it up and pull it out of the base unit.  Once a T/D is settled onto its base, both the mechanical dimensions of the base and bottom plate, and the weight of the machine ensure it will stay put.

No doubt some manual for the Model 14 T/D has diagrams of the base unit, but I don’t find it in the one manual I checked.

I’d guess that many or most of the T/D’s we run into do not have the mating base plate with contacts, because it’s so easy to just pull the T/D out of the base and carry it off without taking the time to remove the base from its installation and include it with the machine.

If I were to admit that I have a basically unused Model 14 T/D complete with base unit in my storage unit, I’d have to add extra padlocks to protect the place.  So, I won’t say anything about that.

Roy

Roy Morgan
k1lky68 at gmail.com
K1LKY Since 1958