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LM Series Crystal Calibrated Frequency Indicating Equipment


NAVY MODEL LM SERIES
CRYSTAL CALIBRATED FREQUENCY
INDICATING EQUIPMENT

Navy Model LM-15 Crystal Calibrated Frequency Indicating Equipment

Navy Model LM-15 Crystal Calibrated Frequency Indicating Equipment

FUNCTIONAL DESCRIPTION

This equipment provides a simple and reliable frequency indicating source between 125 kc and 20 mc for frequency setting and measurement of receivers, transmitters, signal generators, or any electronic devices where the frequency must be known. It is a heterodyne type of unit having a variable oscillator which may be point-checked against an internal crystal oscillator and its harmonics at frequent settings. An external signal may be mixed with the variable oscillator output by a wire or antenna connection to a binding post. A jack provided on the front panel permits the use of phones for listening to the heterodyne. The variable oscillator signal may be internally modulated.

RELATION TO OTHER EQUIPMENT
This equipment will be superseded by Frequency Meter FR-4/U. The various models of LM Series Equipment fall into three categories, according to their power supplies, as follows:


MODEL  POWER INPUT         MECHANICAL DESIGN     REMARKS
   i. Self-contained batteries
 LM-13  Self Contained     Same as LM-1O less    Mounted in Type
         Batteries          shock mount base      CRR-1O111
                                                  Carrying Case
                                                  with Batteries
 LM-17  Self Contained     Same as LM-10         Mounted in Type
         Batteries                                CKB-10111
                                                  Carrying Case
                                                   and CKB-10110
                                                   Canvas Bag com-
                                                   plete with
                                                   batteries
    ii. DC supplied from other equipment
 LM-10  12/14-24/28        Minor Mechanical       LF Het. Osc. fund.
        200/260-260/475     revisions              freq. changed
 LM-12  12-14/24/28        Same as LM-l0           Included in Type
        200/260-260/475                            CRR-10086 Water-
                                                   proof Carrying
                                                   Case
 LM-14  12/14-24/28        Same as LM-10
        200/260-260/475
 LM-16  12/14-24/28        Same as LM-10          Included in Type
        200/260-260/475                            CKB-10086 Water-
                                                   proof Carrying
                                                   Case
 LM-19  12/24-24/28        Same as LM-10          Included in Type
        200/260-260/475                            CRR-10086 Water-
                                                   proof Carrying
                                                   Case
 LM-20  12/24-24/28        Same as LM-10          Included in Type
        200/260-260/475                            CRR-10086 Water-
                                                   proof Carrying
                                                   Case
    iii. AC operation with rectifier unit
 LM-11  Rectifier Power    Same as LM-l0
        Unit CRR-20104
        or CRR-20104A
 LM-15  Rectifier Power    Same as LM-l0
        Unit Type CKB-
        20104 or CKB-20104A
 LM-18  Rectifier Power    Same as LM-10
        Unit CRR-20104A
ELECTROMECHANICAL DESCRIPTION

POWER SUPPLY.- Self-Contained Batteries, i: 12 to 14 v dc, 0.6 amp or 24 to 28 v, dc, 0.3 amp and 200 to 26O v dc, l0 ma or 260 to 475 v dc 30 ma.
External DC Supply, ii: Same as for i above.
Rectifier Power Unit, iii: 105 to 125 v ac, 60 cps, 27 w.

FREQUENCY COVERAGE.-
Range: 125 to 20,000 kc.
Fundamental: 125 to 250 kc and 2000 to 4000 kc.
Crystal Oscillator: 1000 kc.
Modulation: 500 cps.
Accuracy: +-.02%, 125 to 20,000 kc; +-.01%, 2 to 20 mc between -32 degrees and +65 degrees C ambient temp.

PRESENTATION AND CONTROLS.-The drum and disc dials are precision ganged for accurate frequency readings. A panel trimmer is provided for setting the variable oscillator at any check point by heterodyne with the crystal oscillator or its harmonics. A head phone jack for a 600 ohm audio output is mounted on the front panel.

FITTINGS AND ACCESSORIES.-The rf coupling terminal is a single binding post. A Navy Type 49025 Telephone Jack is used.

CONSTRUCTION.-The waterproof carrying case provided is made of aluminum with an olive drab wrinkle finish. The frequency meter case is made of aluminum with a black wrinkle finish.

MANUFACTURER'S OR CONTRACTOR'S DATA

Bendix Radio Division, E. Joppa Rd., Towson 4, Md.
Contract NXsr-23485, dated 2 June 1943.
Contract NXsr-33637, dated 30 June 1943.
Contract NXsr-40987, dated 9 November 1943.

TUBE AND CRYSTAL COMPLEMENT

(1) 76 (1) 77 (1) 6A7
(1) Oscillator crystal type CRR-40023B

REFERENCE DATA AND LITERATURE

NAVSHIPS 900,217-1B: Handbook of Maintenance Instructions for Navy Model LM-19 and LM-20 Crystal Calibrated Frequency Indicating Equipment.


 TYPE            (USAF):
 CLASSIFICATION: (NAVY):

                 (ARMY):  Not Classified
STOCK NO.:  (USAF):
            (NAVY): LM-10: F16-Q-160976-200
            (ARMY): LM-1l: F16-Q-160480-200
                    LM-12: F16-Q-160482-200
                    LM-13  F16-Q-160484-200
                    LM-14:
                    LM-15: F16-Q-160488-200
                    LM-16: F16-Q-160490-200
                    LM-17: F16-Q-160492-200
                    LM-18: F16-Q-160494-200
                    LM-19: F16-Q-160496-200
                    LM-20: F16-Q-160498-200
            (ARMY):
DESIGN COGNIZANCE: Navy, BUAER
PROCUREMENT INFO.:
PROCUREMENT COG.: Navy
RDB IDENT. NO.: 2.1.3
F.I.I..N.:

                                                 EOUIPMENT SUPPLIED
         POWER SUPPLY CATEGORY                        | iii | ii | iii| i  | iii | ii | iii|  i | ii | iii| iii
             NAVY MODEL                       | LM    | 10  | 11 | 12 | 13 |  14 | 15 |  16| 17 | 18 | 19 | 20 
                                              | LBS   |     |    |    |    |     |    |    |    |    |    |    
Heterodyne Frequency Meter,  F16-F-92111-2390 |       |     |    |    |    |     |    |    |    |    |    |    
  CRR-74028 with Tubes plus CRR-40023B        |       |     |    |    |    |     |    |    |    |    |    |    
  Crystal 8-5/8 x 8-1/8 x 8-1/2               | 11.5  |  1  |  1 |  1 |  1 |   1 |  1 |  1 |  1 |  1 |  1 |  1 
Frequency Meter Mounting N16-M-64851-1001     |       |     |    |    |    |     |    |    |    |    |    |    
  Base CRR-10121 7 x 7-7/8 x 1-1/2            |   .5  |  1  |  1 |  1 |    |   1 |  1 |  1 |    |  1 |  1 |  1 
Shielded Power Cable 5 Cond,9 ft Bendix AL71723-3     |  1  |  1 |  1 |    |     |    |    |    |    |    |    
8 Cond, 9 ft Bendix AL75220                   |       |     |    |    |    |     |    |    |    |    |  1 |  1 
4 Cond, 9 ft Mission Bell 15-0A001-3          |  1.9  |     |    |    |    |   1 |  1 |  1 |    |  1 |    |    
Calibration Book                              |       |  1  |  1 |  1 |  1 |   1 |  1 |  1 |  1 |  1 |  1 |  1 
Instruction Book                              |       |  2  |  2 |  2 |  1 |   l |  2 |  2 |  2 |  2 |  2 |  2 
NAVAER 08-5Q-                                 |       | -35 |-36 | -37| -38| -45 |-48 |    |    |    |    |    
NAVSHIPS                                      |       |     |    |    |    |     |    | 95 |998,|900,|900,|900,
                                              |       |     |    |    |    |     |    | 626|903 |002-|217-|217-
                                              |       |     |    |    |    |     |    |    |    | 1B | 1B | 1B 
Waterproof Slip Cover                         |   .25 |  1  |    |    |    |   1 |    |    |    |    |    |    
Spare Parts (Bulk Supply)                     | 15.25 | 1/3 |  1 |  1 | 1/3|   1 |  1 |  1 |  1 |  1 |  1 |  1 
Rectifier Power Unit CRR-20104 or CRR-20104A  |       |     |    |    |    |     |    |    |    |    |    |    
  8-3/16 x 8-15/16 x 8-3/16                   | 13.6  |     |  1 |    |    |     |  1 |    |    |  1 |    |    
Shockproof Mounting Base for Rectifier        |       |     |    |    |    |     |    |    |    |    |    |    
  CRR-10120 7-7/8 x 8-7/16 x 11/16            |   .5  |     |  1 |    |    |     |  1 |    |    |  1 |    |    
AC Input Cable, Shielded 3 Cond, 10 ft Bendix |       |     |    |    |    |     |    |    |    |    |    |    
  AL72091-2                                   |       |     |  1 |    |    |     |    |    |    |  1 |    |    
4 Cond, 10 ft Mission Bell 15-0A002-3         |  1.9  |     |    |    |    |     |  1 |    |    |    |    |    
Waterproof Carrying Case CRR-10086            |       |     |    |    |    |     |    |    |    |    |    |    
  9-5/16 x 10-9/16 x 11-27/32                 |  7.5  |     |    |  1 |    |     |    |  1 |    |    |  1 |  1 
Carrying Case CRR-1O111                       |       |     |    |    |    |     |    |    |    |    |    |    
  9-5/8 x 9-3/4 x 15-7/16                     | 13.5  |     |    |    |  1 |     |    |    |  1 |    |    |    
Waterproof Canvas Bag and Strap CMQ-10110     |  4.0  |     |    |    |  1 |     |    |    |  1 |    |    |    
 TOTAL LESS MR PARTS                          |       |14.15|29.9|21.4|34.0|14.15|29.8|21.4|29.0|29.8|21.4|21.4
    TOTAL

REFERENCES:

The information enclosed here is excerpted from:
Electronics Maintenance Book-Feb 1958- NavShips 900,000.

 

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Version 2.00, 11 Sep 2006