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Summary of Contents for Keysight Technologies 776D
- Page 1 Keysight 776D Dual Directional Coupler Operating and Service Manual...
- Page 4 Data and Computer Software clause at DFARS 252.227-7013 for DOD agencies, and subparagraphs (c)(1) and (c)(2) of the Commercial Computer Software Restricted Rights clause at FAR 52.227-19 for other agencies. K eysight Technologies 1400 Fountaingrove Parkway Santa Rosa, CA 95403-1799, U.S.A. ii K eysight 776D Operating And Service Manual...
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Page 5: Table Of Contents
In This Manual… • Overview, page 1 • Specifications, page 3 • Installation, page 4 • Storage and Shipment, page 6 • Performance Tests, page 7 K eysight 776D Operating And Service Manual iii... - Page 6 Buyer, Buyer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation or maintenance. iv K eysight 776D Operating And Service Manual...
- Page 7 Contact your customer engineer through your local K eysight Technologies Service Center. You can find a list of local service representatives on the Web at the address below.” on page vi). K eysight 776D Operating And Service Manual v...
- Page 8 (088) 226-008 (outside Bangkok) (66) 1-661-3714 (662) 661-3999 (within Bangkok) Hong Kong 800-930-871 (852) 2506 9233 Taiwan 0800-047-866 (886) 2 25456723 People’s Republic of 800-810-0189 (preferred) 10800-650-0121 China 10800-650-0021 India 1-600-11-2929 000-800-650-1101 vi K eysight 776D Operating And Service Manual...
- Page 9 This text indicates that the instrument is an Industrial Scientific and Medical Group 1 Class A product (CISPER 11, Clause 4). This symbol indicates that the power line switch is ON. This symbol indicates that the power line switch is OFF or in STANDBY position. K eysight 776D Operating And Service Manual vii...
- Page 10 If this product is to be powered by autotransformer, make sure the common terminal is connected to the neutral (grounded) side of the ac power supply. viii K eysight 776D Operating And Service Manual...
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Page 11: Overview
Coupler Terminology Description The 776D is a dual directional coupler designed for use in 50-ohm coaxial systems. In this coupler, nominal coupling is 20 dB. The coupling variation with frequency of each auxiliary arm is marked on the nameplate opposite the appropriate auxiliary arm. - Page 12 A network analyzer with either phase magnitude display, phase gain display Reflectometer or polar display, with a sweep generator with appropriate RF unit plug-in, may be used with the 776D as a reflectometer test setup. The network analyzer reflectometer may be used either for fixed frequency or swept frequency measurements.
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Page 13: Specifications
1. Measured with Keysight sliding load. 2. Maximum change in coupling curve of one secondary arm relative to the other. 3. Keysight Type N connectors mate with standard Type N connectors (see text) K eysight 776D Operating and Service Manual 3... -
Page 14: Installation
N-male Pin Depth: –0.207 inches to –0.213 inches (effective 0 to –0.006 inches) Operating Operate the 776D in the range from 0 °C to +55 °C and protect it from excessive humidity. Environment CAUTION Do not heat cycle this coupler during use or storage. Keep coupler near room temperature (25 °C). - Page 15 Signal Flow Signal flow is indicated in Figure 3. Coupling is indicated by arrows. The 776D is bi-directional (signal may go through the coupler in either direction). Figure 3 Type N Connector Dimensions K eysight 776D Operating and Service Manual 5...
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Page 16: Storage And Shipment
Storage and Shipment Environment The 776D may be stored in surroundings between –40 °C and +75 °C. However, heat cycling should be avoided by storing at an even room temperature (25 °C) if at all possible. The greater the heat cycling, the greater chance of dimensional change of the printed circuit board resulting in out-of-specification operation. -
Page 17: Performance Tests
SWR meter and run a calibration line on the X-Y recorder. 6. Set level to 0.5 dB and run a calibration line. 7. Set level to 1.0 dB and run a calibration line. K eysight 776D Operating and Service Manual 7... - Page 18 10. Adjust the gain of the SWR meter for an indication of 1 dB. Remove the 20 dB attenuator and insert the 776D under test, as shown in Figure 4. Run a test trace. See Figure 5. The test trace should have a variation of less than ±...
- Page 19 4. Adjust the RF output for a 5 mV signal on the oscilloscope. 5. Manually sweep the oscillator from 940 to 1900 MHz while observing the waveform. If the waveform does not remain square, adjust the ALC loop gain of the oscillator. K eysight 776D Operating and Service Manual 9...
- Page 20 The setup is now calibrated. 8. Connect the sliding load in place of the coaxial short. 9. Remove the 40 dB pad from the crystal detector and reconnect the 776D under test. 10. Manually slowly sweep the oscillator from 940 MHz to 1900 MHz while rapidly phasing the sliding load.
- Page 21 14. Repeat steps 11 and 12. The corrected result for sliding load reflection should remain practically the same as the original corrected result (with a few tenths of a dB). The true 776D directivity is the other original corrected result, which changed when the sliding load was loosened. It is...
- Page 22 Performance Tests Figure 7 Signal Separation Chart 12 K eysight 776D Operating and Service Manual...
- Page 23 If waveform is not square, a. Adjust the ALC loop gain of the oscillator. If it cannot be adjusted to be square, b. Replace the 10 dB leveling pad with a 20 dB pad and repeat step 5. K eysight 776D Operating and Service Manual 13...
- Page 24 6. This procedure will balance out any source match errors. The setup is now calibrated. 8. Connect the port of the 776D under test as a load on the measurement 776D. Terminate the 776D under test with a sliding load.
- Page 25 This information is subject to change without notice. © Keysight Technologies 2000 - 2014 Edition 4, August 2014 *00776-90010* 00776-90010 www.keysight.com...
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