FREQUENCY METER PREPOSITIONABLE 500MHZ FOR TRANSCEIVER HF and VHF Reference F1BBU027 to see the diagram and the note of assembly Characteristics Minimum operation until 500mhz, 100hertz resolution, 10 hertz below 50mhz Prépositionnable by programming of the PEAK 16F84 of which it is equipped, bill-poster LCD 1 line of 16 characters. Post 16 characters with the choice during 2 seconds at the time of the starting example F1BBU 2003 Description of the diagram One MC 12080 dividing Motorola 1ghz programmable by 10, 20, 40, 80 is used here to divide by 10 the signal to measure and allows an operation until more 500mhz. The resolution is of 100Hz If the signal to be measured is limited to 50mhz have little to be unaware of this circuit and to enter directly on C8 with this case a resolution of 10Hz. The 74HCT00 is used as carries counting and opens during 100ms by an order coming from the PEAK. The 74HCT393 divides the front signal entered the microcontrolor. Assembly in the IC202 IC202 and IC202E to connect the coaxial connection with the J3 point IC202S to connect the coaxial connection with the J7 point Ci above seen interior of the fréquencemetre CONNECTING DIRECTLY the COAX one WITHOUT WRAPPED 4.7PF Ci above left oscillating room IC202 Ci above point 12 volt PHOTOGRAPHS F1AFZ Assembly in transceiver BLU F1BBU To connect the exit of the VXO with the frequency meter by the intermediary of a coaxial cable the frequency meter inside the transceiver will have to be completely armoured. To use a metal case including platinizes it and the bill-poster to avoid any interference with the receiver. The turntable will be assembled to the back of the bill-poster, 4 threaded rods will maintain the case unit platinizes against the front face of the apparatus. A by-pass will be used to uncouple the food correctly. To use a Schubert case with only one cap To make the shortest possible connection. You must be able to assemble this frequency meter in all receiver and transceiver until the less 500Mhz