Stability of Dextrose Solutions of Varying pH

Phase shift versus control voltage for bridged-tee phase modulator {f—7}250 he). work during modulation is not generally serious, since the input reactance of the network decreases to only — j4:Xc/S ohms when R2 becomes zero. Another application of the bridged-tee of figure 3 is suggested by the previously mentioned property of this network of giving constant attenuation with variation in frequency as shown in figure 4, b. Two bridged-tee networks in tandem, properly adjusted, result in a constant phase shift independent of frequency over a wide range. This combination of bridged-tee networks may have advantages over lattice networks that have been described recently [5, 6] for this purpose, particularly since the bridged-tee is single-ended and functions when loaded. Hence, no phase-inverting and isolating vacuum tube amplifiers should be required with this bridged-tee arrangement, although the attenuation through the two bridged-tee networks may be a disadvantage in some applications.