[Hammarlund] Anybody got a Hollow State News issue?

[Roy Morgan]

At 08:18 PM 3/8/2004 -0500, Jerry Kessler wrote:
>I'm looking for an issue of the old "Hollow State News" that contains an
>article by Dallas Lankford about the AN/URM-25D signal generator.
>Craig:
>
>The HSN issue that you need is No 21, Winter 1989.  The Dallas Lankford 
>article on the AN/URM-25D is on Pages 4-6.  I can PDF and e-mail to you 
>but not until Wednesday.


But wait, there is more:

Dallas wrote an 18 +/- page "Overhaul Notes" on the URM-25D that is 
indispensable if you are going to overhaul one or keep it running. It 
details the parts that need to be replaced (surprize!  Black Beauties) and 
just how to keep from damaging the line cord feed through insulators, among 
many other things.

Ralph Sanserino sold reprints for a lowly dollar, and most likely he or the 
current HSN folks still do.

In August 03 this was current info:
"...Back issues are $1 each.  Latest issue is # 53.
Issue # 1 thru # 31 have been compiled and go for $15 for the set.
The compilation PLUS issues 32 - 53 can all be had for $35 postpaid.
Make check payable to:
     Ralph Sanserino
     PO box 1831
     Perris  CA  92572"

I suggest you send him a buck or two and a big 8-1/2 by 11 sase and see 
what he sends back.

Note: these notes by Dallas are for the D model. He has told me he never 
did re-write them for the F model.  That would be a noble task for someone 
who is as thorough as Dallas was.

Here is a list of items that are useful to find for this signal generator, 
other than of course the military technical manuals for the thing:

Hollow State Newsletter
Issue 41, Spring 1997
  - URM-25D Rebuild Notes Supplement (about the Terminal Board, Courtesy of 
Ray Mote)
This issue also contains:
  - Captain Lee's Product Dectector for the R-390/R-390A - Revisited - Part 2
  - "SSB Adapter" - Revisited (see HSN #10 for Lankfords initial report): 
bridge rectifier and 6Uf capacitor only found inside.

HSN Issue 34 Winter 1994-95.  Short Subjects: "Balky Modulation Oscillator 
in the URM-25, by Allan Douglas (about replacing parts in 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 from 
B+, 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" (the terminal 
board layout and parts were not included in  the original Overhaul 
Notes.  The Overhaul Notes were never published in HSN, but were announced 
in one issue.)

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

NAVSHIPS 92134A
Instruction Book
for
R.F. Signal Generator Set
AN/URM-25D
17 March 1955
(this one is in DejaVue form on BAMA at:
<ftp://216.24.174.245/miltest/urm25d/urm-25d.djvu>)

I don't have full details on other later military manuals, but I do have a 
PDF version of a repair parts and special tools list. This particular 
manual is not very interesting by the way, since it just lists parts.

TM11-6625-278-20p.pdf
<begin quote from title page>
*TM 11-6625-278-20P

ORGANIZATIONAL MAINTENANCE REPAIR PARTS AND SPECIAL
TOOL LISTS, SIGNAL GENERATOR SET
AN/URM-25D

Headquarters, Department of the Army, Washington, D. C 20315
12 November 1964

  * This manual, together with C4, 12 November 1964 of TM 11-5551D, 1 March 
1956, C4, 12 November 1964 of TM 11-5551E, 4 September 1956, and TM 
11-6625-603-20P, 23 October 1964, supersedes TM 11-6225-278-20P, 24 
November 1956, including C1, 15 July 1960.
<end quote from title page>

Roy

- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
7130 Panorama Drive, Derwood MD 20855
Home: 301-330-8828 Work: Voice: 301-975-3254,  Fax: 301-948-6213
roy.morgan@nist.gov --