[Milsurplus] Identify Modulation Transformer

[Patrick Jankowiak]

Hmm. Nice transformer!

Ok.

1. Put AC voltage on the secondary (20-120V ok)

2. Measure AC volts on primary.

impedance ratio is ( [primary voltage] / [secondary voltage] )^2

So if you have 70V on the secondary and 50V on the primary, and 
the impedance ratio is the square of the voltage ratio, or 
(70/50)^2, which is (1.4)^2 which is 1.96.


So in any case the secondary having 50V on it and the primary 
having 70v on it would indicate a primary of 1.96*6500, or 12740 
ohms. Now this is not that likely a value, but the math is all 
the same.

I have a similar sized one, rated 120 watts from 200-20,000CPS 
+/- 1dB. It's potted and heavy like that, but mine is 8" tall by 
5" wide by 4.5" deep, and is 8K CT to 2800 ohms.

Patrick


From: John King <k5pgw at yahoo.com>
Subject: [Milsurplus] Identify Modulation Transformer

I have a military modulation transformer with some of
the impedances obliterated.

The readable markings are as follow:

         PART AM- 7195 TEST 10000 V.
         FAMILY 14 GRADE 1 CLASS A

The impedance of the secondary is 6500 ohms.
The impedance of the primary has been obilterated and
that is the value i need to determine.

The transformer was manufactured by MERIT and measures
10.5 inches high (to top of insukators) by width of
5.75 inches by depth of 6 inches. It weighs 34 lbs. It
is/was Gray in color.

Can anyone identify this transformer for me and
provide specs on it? Thanks and 73, John, K5PGW