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Frequenzimetro digitale con PIC16F84
Si tratta di un frequenzimetro programmabile, espressamente progettato per essere abbinato a ricevitori
post 22 Jul 2024
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Automatic SWR and power meter
The display unit is awesome; Above all, the possibility of being able to assess the mean and PEP performance when the time constant is changing comes to my mind
Building a Coaxial Collinear Antenna
The Coaxial Collinear is rarely mentioned, It's design is super simple and since it needs no radials, it takes up little horizontal space its weight is negligible
Cobwebb revealed
The main advantages of the CobWebb over other 5 band 14 to 28 MHz antennas are that it is small, lightweight, strong madefrom fibre glass, only requires a single suppor needs no rotator
CTHA Antenna
Not having found any clear information about how design a CTHA for a specific band I decided to build one using the materials available in the shack just to investigate its behaviour
Build a Saltwater Dummy Load
Here is a simple solution the saltwater dummy load
170
The display unit is awesome; Above all, the possibility of being able to assess the mean and PEP performance when the time constant is changing comes to my mind
The Coaxial Collinear is rarely mentioned, It's design is super simple and since it needs no radials, it takes up little horizontal space its weight is negligible
The main advantages of the CobWebb over other 5 band 14 to 28 MHz antennas are that it is small, lightweight, strong madefrom fibre glass, only requires a single suppor needs no rotator
Not having found any clear information about how design a CTHA for a specific band I decided to build one using the materials available in the shack just to investigate its behaviour
Here is a simple solution the saltwater dummy load
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
30 Volt Computer Power Supply Stack A bonus was that i discovered that these did not need a standby load connected to the supply to keep them running just apply mains power and close the Start lead to ground