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Duplexer 144/432 Mhz
Questo duplexer autocostruibile in pochi minuti,permette di operare con due antenne 144/435 separate con un RTX bibanda
post 01 Oct 2024
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Kiwi CW 40mt
The model described here works on the 40-meter band
LC Meter based on PIC16F628A
This is one of the most accurate and simplest LC inductance / capacitance Meters that one can find, yet one that you can easily build yourself
LC Meter kit has sold out
The LC Meter is a Morse code inductance - capacitance meter kit
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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The model described here works on the 40-meter band
This is one of the most accurate and simplest LC inductance / capacitance Meters that one can find, yet one that you can easily build yourself
The LC Meter is a Morse code inductance - capacitance meter kit
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
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