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*TB 9-6625-108-50
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN

CALIBRATION PROCEDURE FOR SLOTTED LINE, HEWLETT-PACKARD, MODELS 805A, 805C, 805D, S810A, G810B, J810B, H810B, AND X810B; AND IM-92/U AND IM-92A/U (NASSAU MODEL 230)
Headquarters, Department of the Army, Washington, DC 10 December 1973
REPORTING OF ERRORS You can help improve this publication by calling attention to errors and by recommending improvements and stating your reasons for the recommendations. Your letter or DA Form 2028, Recommended Changes to Publications, should be mailed directly to Commander, U. S. Army Aviation and Missile Command, ATTN: AMSAM-TMD-EP, Redstone Arsenal, AL 35898-5000. FAX to DSN 7882313 (commercial 256-842-2313). A reply will be mailed directly to you. SECTION I. IDENTIFICATION AND DESCRIPTION Test instrument identification ............................. Calibration data card (DA Form 2416)................. Calibration description......................................... EQUIPMENT REQUIREMENTS Equipment required ............................................. Accessories required ............................................. CALIBRATION PROCESS FOR SLOTTED LINES, HEWLETT-PACKARAD MODELS 805A, 805C, AND 805D, AND IM-92/U AND IM-92A/U (NASSAU MODEL 230) Preliminary instructions ...................................... Residual VSWR .................................................... Final procedure..................................................... CALIBRATION PROCESS FOR SLOTTED LINES, HEWLETT-PACKARD, MODELS S810A, G810B, J810B, H810B, AND X810B Preliminary instructions ...................................... Equipment setup .................................................. Slope and irregularities ........................................ Final procedure..................................................... Paragraph 1 2 3 4 5 Page 2 2 2 2 3

II.

III.

6 7 8

4 4 7

IV.

9 10 11 12

7 8 10 11

TB 9-6625-108-50 SECTION I IDENTIFICATION AND DESCRIPTION 1. Test Instrument Identification. This bulletin provides instructions for the calibration of Slotted Line, Hewlett-Packard Models 805A, 805C, 805D, S810A, G810B, J810B, H810B, and X810B; and IM-92/U and IM-92A/U (Nassau Model 230). The manufacture's instruction manual was used as the prime data source in compiling these instructions. These slotted lines will be referred to as the "TI" (test instrument) throughout this bulletin. a. Model Variations. Variations among, models are described in table 1 and in text. b. Time and Technique. The time required for this calibration is approximately 2 hours per unit, using the microwave technique. 2. Calibration Data Card (DA Form 2416). Maintenance forms, records, and reports which are to be used by calibration personnel at all calibration levels are listed in and prescribed by TM 38-750. 3. Calibration Description. TI parameters and performance specifications which pertain to this calibration are listed in table 1.
Table 1. Calibration Description Test instrument parameters. Performance specifications Frequency range 500 to 4000 MHz 1 2 3 2.60 to 3.95 GHz (H-P S810A). 3.95 to 5.85 GHz (H-P G810B). 5.30 to 8.20 GHz (H-P J810B). 7.05 to 10.0 GHz (H-P H810B). 8.0 to 12.4 GHz (H-P X810B). Characteristic impedence.5 50 ohms 1 3 46.3 ohms 2 Residual SWR Less than 1.04:11 3 Less than 1.02:12 Slope and irregularities
1H-P 2H-P

Less than 1.01:14

Models 805A and 805C. Model 805D. 3IM-92/U and IM-92A/U. 4H-P Models S810A, G810B, J810B, and X810B. 5This specification is for information only and is not verified in this bulletin.

SECTION II EQUIPMENT REQUIREMENTS 4. Equipment Required. Tables 2 and 4 identify the specific equipment used in this calibration procedure. This equipment is issued with secondary transfer calibration standards set 4931-621-7877 and is to be used in performing this procedure. Alternate 2

TB 9-6625-108-50 items may be used by the calibrating activity when the equipment listed in tables 2 and 4 is not available. The items selected must be verified to perform satisfactorily prior to use and must bear evidence of current calibration. The equipment must meet or exceed the minimum use specifications listed in tables 2 and 4. The accuracies listed in tables 2 and 4 provide a four-to-one accuracy ratio between the standard and TI. Where the four-to-one ratio cannot be met, the actual accuracy of the equipment selected is shown in parenthesis. 5. Accessories Required. The accessories listed in tables 3 and 5 are issued with secondary transfer calibration standards set 4931-621-7877 and are to be used in this calibration procedure. When necessary, these items may be substituted by equivalent items unless specifically prohibited.
Table 2. Minimum Specifications of Equipment Required Manufacturer, model, and part number. Common name Minimum use specifications. MODULATOR Range: 2 to 4 GHz Hewlett-Packard, Model C108403A (7912321). Type: Square wave PIN MODULATOR SIGNAL SOURCE SLIDING TERMINATION SWR METER Range: Square wave modulation: from 2 to 4 GHz. Range: 2 to 4 GHz Power output: 10 MW min Range: 2 to 4 GHz Range: 1.01 to 1.1 Hewlett-Packard, Model 8732B (7912581). (7923114) Narda, Model 22487 (7923224). Hewlett-Packard, Model Y10415E (7910160-3).

Item A1 A2 A3 A4 A5

Item B1 B2 B3 B4 B5 B6 B7 B8 B9
1Two 2Used

Common Name ADAPTER1 ADAPTER ADAPTER2 ADAPTER2 ADAPTER2 VARIABLE ATTENUATOR CABLE CABLE1 ISOLATOR

Table 3. Accessories Required Description And Part Number N plug to N plug (MS-15507-57B) N jack to GR900 (7911051) or N plug to GR900 (7911052).2 N jack to 7/8 in., jack (8899714) N plug to 7/8 in., plug (10528698) 90° bend with N plug to N jack (MS90156-27D) 0 to 15 db, 1 to 4 GHz (7923130) 18 in., RG-9 ( ) /U with N plug terminations (10519072). 24 in., RG-58 ( ) /U with BNC plug terminations (10519141). 1 to 4 GHz (7913127-2)

required. for H-P Model 805D.

3

TB 9-6625-108-50 SECTION III CALIBRATION PROCESS FOR SLOTTED LINES, HEWLETT-PACKARD MODELS 805A, 805C, AND 805D; AND IM-92/U AND IM-92A/U (NASSAU MODEL 230) 6. Preliminary Instructions a. The instructions outlined in this paragraph are preparatory to the calibration process. Personnel should become familiar with the entire section before beginning the calibration. b. Items of equipment used in this procedure are referenced within the text by common name and item identification number as listed in tables 2 and 3. For the identification of equipment referenced by item numbers prefixed with A, see table 2, and for prefix B, see table 3. WARNING HIGH VOLTAGE is used during the performance of this calibration. DEATH ON CONTACT may result if personnel fail to observe safety precautions. NOTE Unless otherwise specified, verify the results of each test and take corrective action whenever the test requirement is not met before continuing with the calibration. c. Connect the equipment as shown in figure 1. d. Energize the equipment and allow sufficient time for warmup. e. Adjust signal source (A3) for a 2-GHz leveled output. 7. Residual VSWR NOTE The VSWR should be measured on the 30-db range of SWR meter (A5). To set up a reference for this measurement, adjust modulator (A1) frequency, variable attenuator (B6), and the TI probe tuning and depth controls until the SWR meter indicates full scale with minimum TI probe depth. a. Performance Check (1) Adjust sliding termination (A4) and the TI until the measured SWR is maximum. Record SWR meter (A5) indication as SWR max. 4

TB 9-6625-108-50

Figure 1. Residual VSWR - equipment setup for Hewlett-Packard Models 805( ) and IM-92( )/U.

5

TB 9-6625-108-50 (2) Calculate maximum reflection coefficient (Pmax), using formula:
Pmax = SWRmax-1 SWRmax + 1

(3) Adjust sliding termination until measured SWR is minimum. meter indication as SWRmin. (4) Calculate minimum reflection coefficient (Pmin), using formula:
Pmin = SWRmin-1 SWRmin + 1

Record SWR

(5) Substitute calculated values in following equations and solve for maximum and minimum reflection coefficient of sliding termination (PL) or TI (PS).
(a) PL or PS = Pmax ą Pmin 2 (b) PL or PS = Pmax - Pmin 2

(6) Record the values obtained in (5) above. (7) With the TI probe carriage in a fixed position, move the sliding termination back and forth and record the SWR indication. (8) Calculate the reflection coefficient of sliding termination (PL) from measured SWR recorded in (7) above, using formula:
P = SWR -1 SWR +1

(9) Compare the result with (5)(a) and (b) above. The identical value or nearly same value is the reflection coefficient of the sliding termination (PL). The other value, (5)(a) or (b) above, is the TI reflection coefficient (PS). (10) Compute residual SWR of TI, using formula:
SWRs = 1 + Ps 1 - Ps It will be 1.04 or less.

NOTE To verify SWR of sliding termination, use formula:
SWRL = 1 + PL 1 - PL

(11) Repeat technique of (1) through (10) above at test frequencies of 3 and 4 GHz. Residual SWR will be less than 1.04 for each test frequency. 6

TB 9-6625-108-50 (12) Disconnect sliding termination and the isolator (B9) from the TI and connect them to the opposite ends of the TI from which they were disconnected. Reverse adapters as necessary. (13) Repeat (1) through (11) above. b. Adjustments. No adjustment can be made. 8. Final Procedure a. Deenergize and disconnect all equipment. b. In accordance with TM 38-750, annotate and affix DA Label 80 (US Army Calibration System). When the TI cannot be adjusted within tolerance, annotate and affix DA Form 2417 (Unserviceable or Limited Use tag). SECTION IV CALIBRATION PROCESS FOR SLOTTED LINES, HEWLETT-PACKARD MODELS S810A, G810B, J810B, H810B, AND X810B 9. Preliminary Instructions a. The instructions outlined in this paragraph are preparatory to the calibration process. Personnel should become familiar with the entire section before beginning the calibration. b. Items of equipment used in this procedure are referenced within the text by common name and item identification number as listed in tables 4 and 5. For the identification of equipment referenced by item numbers prefixed with A, see table 4, and for prefix B, see table 5. When the standards referenced in table 4 are not available, refer to table 2 before selecting substitutes.
Table 4. Minimum Specifications of Equipment Required Item A1 A2 A3 A4 Common name MODULATOR PIN MODULATOR SIGNAL SOURCE SLIDING TERMINATION Minimum use specifications Range: 2.8 to 12.4 GHz Type: Square wave (1 kHz) Range: Square wave modulation from 2.8 to 12.4 GHz. Range: 2.8 to 12.4 GHz at 10 mw output. Range: 1 to 8 GHz 8 to 12.4 GHz. Range: 1.01 to 1.1 Manufacturer, model, and part number. Hewlett-Packard, Model C10-8403A (7912321). Hewlett-Packard, Model 8732B (7912581). (7923114) Narda, Model 22487 (7923224). PRD, Model 1131 MOD (7923205-6). Hewlett-Packard Model Y10-415E (7910160-3).

A5

SWR METER

7

TB 9-6625-108-50
Item B1 B2 B3 B4 Table 5. Accessories Required Common Name Description And Part Number ADAPTER N plug to N plug (MS-15507) ADAPTER N plug to GR900 (7911051) ADAPTER 1 90° bend with N plug to N jack (MS-90156-27D) COAXIAL TO WAVEGUIDE 2.6 to 3.95 GHz (10519427) ADAPTER 1 3.95 to 5.85 GHz (10519426) 5.4 to 8.2 GHz (10519425) 8.2 to 12.4 GHz (10519423). VARIABLE ATTENUATOR 1 to 8 GHz (7923130) 8 to 12.4 GHz (7923131) CABLE 2 18 in., RG-9 ( ) /U with N terminations (10519072). CABLE 1 24 in., RG-58 ( ) /U with BNC terminations (10519141). ISOLATOR 2 to 4 GHz (7913127-1) 4 to 8 GHz (7913127-2) 8 to 12.4 GHz (7923167) WAVEGUIDE PROBE 3 10519399

B5 B6 B7 B8 B9
1Two 2Three

required. required. 3Furnished with test instrument.

WARNING HIGH VOLTAGE is used during the performance of this calibration. DEATH ON CONTACT may result if personnel fail to observe safety precautions. NOTE Unless otherwise specified, verify the results of each test and take corrective action whenever the test requirement is not met before continuing with the calibration. 10. Equipment Setup a. Connect equipment as shown in figure 2. b. Adjust variable attenuator (B5) for maximum attenuation. c. Adjust waveguide probe (B9) for minimum probe penetration. d. Adjust signal source (A3) for leveled output of appropriate frequencies, listed in (1) through (5) below: (1) Model S810A - 2.8 GHz. (2) Model G810B - 4.0 GHz. (3) Model J810B - 5.5 GHz.

8

TB 9-6625-108-50

Figure 2. Slope and irregularity measurement - equipment setup for Hewlett-Packard Model 810 series.

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TB 9-6625-108-50 (4) Model H810B - 7.5 GHz. (5) Model X810B - 8.5 GHz. e. Adjust modulator (A1) for 1000 Hz. 11. Slope and Irregularities NOTE The slope and irregularities should be measured on the 30-db range of SWR meter (A5). To set up a reference for this measurement, adjust modulator (A1) frequency, variable attenuator (B5), and waveguide probe (B9) tuning and depth controls until the SWR meter indicates full scale with minimum TI probe depth. a. Performance Check (1) Move TI carriage along slotted line; measure and record VSWR at two different positions along slotted line. Difference between values recorded will not exceed 0.01. Example: 1.015 - 1.005 = 0.010 (2) Repeat technique of (1) above at test frequencies listed in (a) through (e) below: (a) Model S810A - 3.4 and 3.8 GHz. (b) Model G810B - 4.8 and 5.8 GHz. (c) Model J810B - 7 and 7.8 GHz. (d) Model H810B - 8.5 and 9.5 GHz. (e) Model X810B - 10.0 and 11.5 GHz. (3) Disconnect cable (B6) and adapter (B2) from the waveguide adapters. Reverse the direction of the TI and reconnect the cable and adapter. Repeat (1) and (2) above. b. Adjustments. No adjustment can be made.

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TB 9-6625-108-50 12. Final Procedure a. Deenergize and disconnect all equipment. b. In accordance with TM 38-750, annotate and affix DA Label 80 (US Army Calibration System). When the TI cannot be adjusted within tolerance, annotate and affix DA Form 2417 (Unserviceable or Limited Use tag).

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TB 9-6625-108-35 By Order of the Secretary of the Army: CREIGHTON W. ABRAMS, General, United States Army Chief of Staff Official: VERNE L. BOWERS Major General, United States Army The Adjutant General Distribution: To be distributed in accordance with DA Form 12-34, Section II (qty rqr block no. 75), requirements for calibration procedures publications.

US GOVERNMENT PRINTING OFFICE: 1973 - 747-693/5036

PIN: 010328-000