inland 302E

This is a military surplus new Inland precision speed control 302E. It is about 18 inches across. It was made by Inland Controls Inc which is somehow associated with BAE Systems. This thing is new, it came in the original packaging, desiccant etc.

Highlights (which are actually guesses, I am hoping that I supplied enough information for you to guess whether I am right):

Crystal oven controlled oscillator
Stepwise variable transformer with precision decade dials
New (new old stock) unit

My guess is that it is a controller that can drive a servo or a synchro motor with high accuracy. Most likely, you would connect the servo motor amplifier to the back, set the exact speed with the dial and then flip the motor switch on and it would start turning at a predetermined rate. It probably accepts synchro sensor input. These are only guesses, yours is as good as mine.

You can probably use this item for homemade stroboscopes, anywhere where exact setting of rotational speed is important.

This unit is new (new old stock). The one that I will ship to you will be in the original SEALED waterproof packaging, with three large sacks of desiccant. This means that the item you are looking at will not be the one shipped. The item that you see on photographs has one blemish, the little plastic pointer is cracked due to my mishandling of the open item. But you won't be bidding on it. Well, it is my loss and I would like to sell a fully new item. The plastic pointer is not connected to anything electrically anyway, it is just used to see the position of the precision decade dials.

This unit powers up. I have given it minimal testing, it powers up and when I flip the motor switch on, there is a 9.42V DC voltage on the servo connector.

According to one knowledgeable individual discussing the oven:

>The oven turns on and off periodically when the unit is on. It was quite
>mysterious.

        Normally used for stabilizing quartz frequency references
(crystals), and sometime for temperature stabilizing zener diodes as
voltage references.

        The color and maker matches other lab equipment that I've seen.

        However, consider that the multi-tiered dial on the front panel
is a stepwise variable transformer (AC only), and is (still) quite
expensive even at hamfests.  Note that it is probably something like
6-8" deep behind that panel, which suggests that the power supply is on
one side, and the circuit boards on the other.

        And a *big* power transformer, too.  Nice military grade sealed
unit.  Look like it is probably tube based.  I can't quite make out the
voltages printed on the transformer, but it looks as though the topmost
winding is labeled as 300V, which suggests that it is tube based (and
therefore even older than I was thinking. :-)

[[[Seller: it is rated 350V not 300V]]]

(Click on the thumbnail images to enlarge)

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