ID large transformer?

[Opcom]

A friend of mine was given a couple pieces of iron and I wonder if any of the BC enginers could identify them and what they may have gone in. He is thinking about using a 250TH with it.

Here's what was written:
Xfmr is an Electro Engineering Model E-12243
Xfmr is an open frame with 2 large symmetrical windings on a tall rectangle core.
5780 VCT @.445A secondary with a 200-250V (adjustable taps) primary
1.25 KVA according to the tag.
Pri DC resistance is 7 ohm. Sec. 325 ohm.

With the trans. is also a huge (marked as 'L-101') choke (2/3 size of xfmr) that has 700 ohm DC res.
No marks on the choke but 700 Ohms seems very high.
Could it be a modulation choke therefore large size and lots of windings?

[KA2DZT]

Choke resistance does seem way too high for a power supply reactor.  Probably a mod reactor but 700 ohms seems a little high even for that.  I have a 50hy 200ma mod reactor and it is about 300ohms.  I have a Electro Engineering 10hy 800ma 10KV choke and I think it measures about 30-40ohms.

The transformer speaks for itself, it's labeled.  Those rating are CCS, so for ICAS you can get more current out of it.  The resistance of the xfmr seems a little high too.  Sure the ohm meter you used is accurate??  I have a big Navy xfmr that 5700VCT @1.46KVA, no current rating on it, but I figured it's good for 500ma CCS.  The sec resistance is 180ohms, don't remember the primary resistance but I doubt it's anywhere near 7 ohms.  It has dual 230VAC primary windings.

Funny thing about the L-101,  I'm not sure how many coils and chokes I have that are marked L-101, all different.  Must be some standard part number that was used on coils that were Top Secret.

Fred

[KL7OF]

Didn't Gates mark L101 on just about ALL their plate supply chokes??

[KM1H]

And Gates used that manufacturer but in the BC-1T at least it is labled L1 and measures 28 Ohms. The matching mod reactor is 220 Ohms.

A 700 Ohm choke sounds like a very low current at high inductance unit or somethin quite wrong if it is a L1 function.

Carl

[KE6DF]

Most engineers back in the day labeled inductors L1, L2, L3, ... on the schematic, so you could find them in the parts list.

Or L101, L102. L103 ...

Just like they number transformers T101, T102, ... or vacuum tubes V1, V2 etc.

So whatever transmitter company this choke came from probably had the OEM manufacturer put the part number used in the schematic and parts list on the inductor.

That's why there are so many different L101's out there...

[KA2DZT]

I measured the primary resistance on a few big plate xfmrs.  They all measured less than 0.4 ohms.

All your DC ohm measurements seem way off the norm.  I would recheck the readings with an ohm meter that you're sure is reading correctly.

Fred