Sigma LBA-300 Betriebsanleitung

OPERATING INSTRUCTIONS TYPE 874-LBA/-LBB SLOTTED LINES GENERAL RADIO COMPANY

At a voltage minimum, the two voltage waves are opposing and the two current waves are aiding. Again the effective impedance is a pure resistance and

~--T_Y_P_E_8_74_-L_B_A __ S_L_O_T_T_E_D_L_I_N_E ______________________________________ _ If the line loss cannot be neglected, the equations are: Zx Z

electrical distance away (for instance, at the load) is desired, the problem can be solved using the Smith Chart in the following manner: First, locat

~ TYPE 874-LBA SLOTTED LINE ~--------------------------VSWR as a ratio, ~~~· or in db on the appropriate scale. (In the example of Figure 6, the VSW

The example plotted on the chart in Figure 7 shows the procedure for determining the load im-pedance when the VSWR is 5 to 1, and the electrical dista

~--T_YP_E __ 87_4-_L_BA __ S_L_O_T_T_E_D __ L_IN_E ____________________________________ __ sion line. The impedances at points 1 and 2, a quarter-wave

DESCRIPTION INNER CONDUCTOR PROBE ADJUSTING SCREW Figure 9a. Cross-sectional views of the carriage on the Type 874-LDA Slotted Line, showing the crys

~ TYPE 874-LBA SLOTTED LINE ~----------------------~-TYPE 1360-A MICROWAVE OSCILLATOR Figure 10. Use of a modulated source for measurements with th

wave modulation, as well as a regulated power sup-ply, for the unit oscillators in slotted -line use. 3.3 DETECTOR As mentioned previously, either the

~--T_YP_E_8_7_4-_LB_A __ S_L_O_T_T_E_D_L_I_N_E ____________________________________ __ SECTION 4 OPERATION 4.1 CONNECTIONS AND ADJUSTMENTS. 4.1.1 GENE

GENERAL RADIO COMPANY WEST CONCORD, MASSACHUSETTS 01781 617 369-4400 617 646-7400 5 ALE 5 ENGINEERING OFFICES NEW ENGLAND* 22 Baker Avenue West Concor

3 em Physical 3.2cm Electrical 50-0HM ~==j~~b=~COAXIAL LINE tFZ=P-g~~§P==~ POl NT AT WHICH IMPEDANCE IS MEASURED 874-WN OR WO (b) OPERATION POSITION O

~--T_Y_PE __ 87_4_-L_B_A_S_L_O_T_T_E_D __ L_I_N_E ____________________________________ __ 4.2.2 HETERODYNE DETECTOR. When the DNT Detector is used, c

The probe coupling or the oscillator output should be adjusted until the output from the detector is in a satisfactory range. If the crystal detector

~ TYPE 874-LBA SLOTTED LINE ~~~~~~~------------------Figure 14. Method of improving the accu-~ racy of the determi-f=! nation of the position ..J &g

The electrical distance between the unknown and the minimum found on the line can be determined A.S outlined in Paragraph 4.5.2. At very high standing

~ TYPE 874-LBA SLOTTED LINE ~------------IMPEDANCE COORDINATES-50·0HM CHARACTERISTK IMPEDANCE Figure 16b. Example of the use of the Smith Chart for li

The impedance of an unknown connected to the slotted line by a line or cable having an appreciable loss can be calculated from the slotted -line me as

~--T_Y_P_E_8_74_-_LB_A __ S_L_O_T_T_E_D __ L_IN_E ____________________________________ ___ as a Type 874-Gl0,10-DB Pad, between the oscillator and the

(4) If theVSWR is less than lO,measure the rel-ative output from the detector at several minima and maxima. Actually, only one minimum and one maximum

~~T~YP~E~8~7~4-~LB~A~S~L~O~T~T~E~D_L~I~N~E--------------------------------------(For greater accuracy, the variation in probe coup-ling can be calibra

INSTRUCTION MANUAL TYPE 874-LBA/-LBB SLOTTED LINES GENERAL Form 0874-0215-1 April, 1966 Copyright 1962 by General Radio Company West Concord, Massac

OPERATION IMPEDANCE COORDINATES-50-0HM CHARACTERISTIC IMPEDANCE 10, the approximate form can be used. Also, 8 is negative, since it lies on the load s

~ TYPE 874-LBA SLOTTED LINE ~--------------------------vantageous to measure the impedance at the front face of the polystyrene bead in the unknown co

If the admittance of the unknown is desired, rather than the impedance, the admittance, Ym, appearing across the end of the line, is calculated from t

~--TY_P_E_8_7_4-_LB_A __ S_L_O_T_T_E_D __ L_IN_E ______________________________________ __ the ungrounded terminal, and the outer conductor is extende

MISCELLANEOUS SECTION 5 MISCELLANEOUS 5.1 OPERATION AT FREQUENCIES BELOW 300 Me. Since the probe travel is only 50 em, it will not always be possible

~ __ T_Y_P_E_8_74_-L_B_A __ S_L_O_T_T_E_D_L_I_N_E ____________________________________ ___ SECTION 6 SERVICE AND 6.1 GENERAL. The two-year warranty gi

END CASTING POLYSTYRENE BEAD (0874-0700) OUTER CONDUCTOR (0874-0603) INNER CONDUCTOR (0874-6119) RETAINING RINGS (0874 -OSlO) TEFLON INSULATOR (0874

TYPE 87 4 COAXIAL COMPONENTS TYPE 874 CABLE CONNECTORS TYPE 874 ADAPTORS CONNECTOR CABLE PANEL PANEL PANEL TYPE CABLE LOCKING FLANGED LOCKING LOCKI

TABLE OF CONTENTS Section 1. GENERAL DESCRIPTION. 1 Section 2. THEORY • 1 2.1 Characteristic Impedance and Velocity of Propagation. 1 2.2 Traveling

NOTE: All instructions for the Type 874-LBA apply equally to the Type 874-LBB except that the maximum operating frequency of the Type 874-L

SECTION 1 GENERAL One of the important basic measuring instru-ments used at ultra-high frequencies is the slotted line. With it, the standing-wave pat

~ TYPE 874-LBA SLOTTED LINE ~~~~~~~------------------unit length, C, is defined as the characteristic im-pedance, Z0, of the line. (1) This is an app

generator is called the reflected wave. The combina-tion of these two traveling waves produces a stationary interference pattern which is called a sta

~--TY_P_E_8_7_4-_LB_A __ S_L_O_T_T_E_D __ L_IN_E ______________________________________ __ ratio of the maximum to minimum voltages, which is called t