tuning coil การใช้

• Bernds was 14 when he built his first radio using a tuning coil wound around a Quaker Oats box.
• The only other parts required to build a Radio receiver were the tuning coil; the tuning capacitor and the loudspeaker.
• As a consequence, most Autodyne receivers needed quite elaborate antenna tuning networks, often involving double-tuned coils, to avoid image interference.
• The registered name DIMIC identified a range of high efficiency plug-in tuning coils covering all the radio wavebands from 15 metres upwards.
• When the front panel tuning controls are rotated, this system raises and lowers ferrite slugs in and out of the receiver's tuning coils.
• Tuning coils in the radio frequency stage of a set were rather large and Lear knew how to reduce their size by using Litz wire.
• Yet, instead of winding their own tuning coils and wielding soldering irons as they used to, most of these traditionally minded hams now operate mass-produced equipment from Japan.
• To minimize the cost, many of the plans suggested winding the tuning coil on empty pasteboard containers such as oatmeal boxes, which became a common foundation for homemade radios.
• By the mid-1930s however, superheterodynes were using much higher intermediate frequencies, ( typically around 440 470 kHz ), with tuned coils similar in construction to the aerial and oscillator coils.
• A reported offer to donate the " Aspidistra " transmitter to London's valves ( tubes ) and a large tuning coil were saved by FCO engineers and are now on display in the foyer of the Orfordness station.
• Therefore, in improved receiver circuits, in order to match the antenna impedance to the receiver's impedance, the antenna was connected across only a portion of the tuning coil's turns . adjustment of both the resonant frequency and the turns ratio.
• Some modern crystal sets use a ferrite core tuning coil, in which a ferrite magnetic core is moved into and out of the coil, thereby varying the inductance by changing the magnetic permeability ( this eliminated the less reliable mechanical contact ).
• :: But if the normal radio scanners are freely available, I don't see why would modding a FM receiver ( or building one from scratch with the tuning coils slightly modified ? ) be illegal .-- G 04 : 14, 26 June 2007 ( UTC)
• There were apparently heat-seeking missiles used to take out the tuning coil of every antenna, there were fragmentation bombs used to take out the parabolic dish fore and aft . On the first strafing run, virtually all communications and all means of survival were destroyed.
• There were apparently heat-seeking missiles used to take out the tuning coil of every antenna, there were fragmentation bombs used to take out the parabolic dish fore and aft . On the first strafing run virtually all communications and all means of survival were destroyed.