[R-390] URM 25 D Signal Generator

Roy Morgan [email protected]
Fri, 17 Jan 2003 15:05:14 -0500


At 01:13 PM 1/17/03 -0600, [email protected] wrote:
>http://bama.sbc.edu/ under 'Military Test Gear'
>
> >
> > I am trying to repair two URM 25D Signal Generators but I need the
> > schematics.

You also need any or all of the following, ESPECIALLY Dallas Lankford's 
Overhaul Notes:

Hollow State Newsletter
Issue 41, Spring 1997
   - URM-25D Rebuild Notes Supplement (about the Terminal Board, Courtesy 
of Ray Mote)


HSN Issue 34 Winter 1994-95.  Short Subjects: "Balky Modulation Oscillator 
in the URM-25, by Allan Douglas (about the R-C "T network" and padding a 
capacitor to make it work again)

E-mail from Nolan Lee to Roy Morgan Dec 22, 1998 advising to replace the 
coax cables found with URM-25's since they are often lossy, replacing the 
coupling cap in the "Test Lead" to prevent damage to the attenuator, and 
checking all cap and resistor values in the generator.

URM-25D Overhaul Notes by Dallas Lankford 11-88, revised. 1-94, with copy 
of HSN Supplement from Issue 41 about the "Terminal Board".

Signal Corps SSTS Operation Sheet 51038, "RF Signal Generator Set 
AN/URM-25D Operation and Calibration"  U.S. Army Signal Center and School, 
Fort Monmouth, N.J. 17 pages


Roy





- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
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