[Milsurplus] LM-18, Need Info.

[Bill & Arlene Hooper]

Hi,

A Navy LM-18 (CRR-74028), with the appropriate cal book and an attached, =
home-brew power supply (clever, no holes in the LM) followed me home =
from a swap meet and I would like some information if convenient to you.

I have been able to get some info on the various models of the BC-221, =
but not the LM-18.

I understand it is covered in the April 1959 issue of CQ, but my =
collection skips that issue (naturally).

The LM plug appears to differ from the BC-221 plug, although the =
difference(s) may just be poor drawing from one of the Surplus =
Conversion manuals.

The attached home-brew power supply furnishes something near 24VAC and a =
regulated 258VDC (0A2 and OB2 in series).     =20

One Surplus Conversion showed a power supply with no regulation at =
250VDC depending on the internal neon regulators, one said regulated =
150VDC was better because of less heat and therefore more stability.

Can someone point me in the right direction? An LM-18 schematic, or =
direction to one, would be much appreciated.

Only LM-18 mod I can see is a spliced wire behind the "RF Coupling" pot.

Thanks for the space - !

      Bill & Arlene Hooper   KF6AR

  billnroo@earthlink.net
=20
=20
           John 3:16=20
=20
NNNN           =20
=20









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