Encyclopedia of radio electronics and electrical engineering / Civil radio communications
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In order to use the "SWR Panoramic Indicator" by I. Nechaev ("Radio", 1996, No. 8. p. 8, 9) together with oscilloscopes that do not have an "X" input (N-313, S1-112A, etc.) . a sawtooth voltage generator (SPG) must be introduced into it.
The diagram of the device and its connection to the SWR indicator are shown in fig. one.
On the transistor VT1, a current generator is assembled, on VT2 - the "saw" generator itself, and on VT3 - an emitter follower. The repetition period of the "saw" is determined by the capacitance of the capacitor C1 and the current of its charging from the current stabilizer. Resistor R2 sets the generation frequency in the range of 40 - 60 Hz, and resistor R6 - the amplitude of the sawtooth voltage.
The signal from the output of the GPN goes to the contact "Aut." switch SA1 indicator SWR. The conductor going to the secondary winding of the transformer T1. must be disconnected. A pulse of positive polarity is taken from the resistor R5 to synchronize the sweep of the oscilloscope.
The HPN is mounted on a printed circuit board (Fig. 2) made of one-sided foil fiberglass.
Resistors R2 and R6 - SPZ-38a.
Establishing the GPN together with the SWR indicator comes down to setting the frequency and level of the sawtooth voltage, at which the technical characteristics of the indicator are provided.
Author: B.Tatarko, Tver
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