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Multiband Transmitting BPF Project
After installing a couple of wire antennas in the trees we discovered that when one of us was transmitting the other couldn't receive anything but interference. I later learned that simultaneous operation of two radio transmitters in close proximity on separate bands will overload and desensitize the radio's receivers. A bandpass filter for each radio can be used to reduce this problem but the filter must be able to withstand the transmitter's power
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This dip meters use 2SC2369 transistor for RF Oscillator and 2SC458 for AM Tone Oscillator
TX ATV per i 23 cm con output regolabile da 100 a 250mW
Un semplice decoder CW che utilizza il microprocessore PIC16F84 con un displayLCD da 2 righe x 16 caratteri
There are a number of advantages to a Delta match feed system and these outweigh any disadvantages
Adottare l'installazione di un filtro passa basso all'uscita della catena trasmittente
23cm Yagi Antenna building Finished antenna at 1275 MHz SWR under 1:1.5 at resonant frequency
50 MHz preamp Gain 26dB with the BFG135 Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power. FG connection
Interface-for-digital-broadcasts-with-integrated-audio 4-port HUB, with a TUSB2046. With port 1 of the HUB we drive the FT232RL; with port 2 the PCM2904, furthermore, we decided to leave ports 3 and 4 free