Century Electronics FC-2 Fast-Check Tube Tester manual

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2a, has a polar diagram as shown, this being a diagram which signifies signal pick-up strength in all possible directions. 2a shows the horizontal polar diagram for a vertical split dipole. It shows that, for a signal coming from the transmitter at the right, the signal pick-up is proportional to length OA; if the signal comes from point B, the pick-up is proportional to OB, and for direction C it is proportional to OC. The aerial, if tilted by a few degrees, will pick up a reasonable signal from A, B or C.

I region I high-frequency region 3dB 1()0 bandwidth being as shown. If Sis now opened, negative feedback is introduced and the collector output falls, some output appearing across the emitter resistor. The dashed line shows the new response and also the greater bandwidth between the 3 dB points. The gain has therefore dropped, but the bandwidth has increased. This property of any amplifier is often referred to as the gain-bandwidth product, and in the perfect amplifier with response shown in chapter 4, where the operational amplifier is described, this quantity is always constant.

Two such amplifiers may be connected in cascade to generate a frequency response where two peaks are required at two different frequencies. f. 19. A tuned transformer is placed in the drain circuit of TR1 with tuning on both primary and secondary windings, the tapping on the secondary being for impedancematching purposes. f. input to the source, output from the drain. Since the FET is also a mixer stage, a second signal is applied to the gate +12V +12V . f. f. f. signal inside the FET circuit. c.

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