When a sync pulse is not present, the output of the video detector goes negative and the cur- rent from the differential amp reverse biases Dl and forward biases D2. That «inserts» the attenuator in the circuit. Soaring sales, new and improved video prod- ucts, entirely new technologies have opened up new opportunities for the trained technician as never before. The signal is then diode detected and fed to the active-filter stage. That function COMB Authorized Liquidator NOTE: Monitor not available. Используя эту возможность вы можете превратить свое место в профессиональную студию для работы в nSDR2 PRO адаптировано для работы к контестах. The solution to those problems is to design a decoder that essentially contains a complete TV-set «front-end.» The de- coder would then contain a tuner. IF amp, video and audio detectors, and an RF modulator.
Size is not critical, as long as it is appropriate forthe task. For ex- ample, 0.1-volt resolutions are possible on the1000-volt DC range and 1-kilohm resolutions are pos- sible on the 25-megohm range. At the other end of the scale, quan- tities as lowas10u,Vand0.01-ohms can be read. This is impossible with any other radio I have. Itfeatures a keyboard lock switch to prevent accidental entry and more. HsvT ) DISARM i — 6-*o ARM GREEN RED FIG. 2— THE CIRCUIT CAN BE BUILT on a tiny PC board.
The satellite dish Is the radio equivalent of the optical reflecting telescope. dish is used to concentrate microwave sig- nals into a tight beam. School of Electronics McGraw-Hill Continuing Education Center 3939 Wisconsin Avenue, NW fiJ Washington, DC 20016 Kfili 0) m TJ H m 00 m jj CO 00 11 Ask RE WRITE TO: ASK RE Radio-Electronics 500-B Bi-County Blvd. You start from scratch and «discover by doing.» You conduct key experiments . . , perform vital tests , . . build your own systems . . . and do it all at the pace that suits you best. That opposition has most often been based on aesthetics or the per- ceived dangers of RF radiation. Test capacitor value, leakage, dielectric absorption, and ESR dynamically; with up to 600 volts applied for guaranteed 100% reliable results — it’s exclusive — it’s triple patented. Almost all of us have witnessed the «Venetian blind» effect on our TV sets. It is caused by VHF skip, which usually takes place in the spring and fall.