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222 MHz Transverter for the FT-817
The transverter can be configured to work with the Flex-1500 SDR and other transceivers with transverter ports. The boards can also be modified for 144 or 432 MHz
post 30 Aug 2024
Projects_Homebrew Links →
Digital Wattmeter with AD8307, PIC16F876, LCD Display
This Wattmeter is in Elektor Magazine Oktober 2002, they will sell PIC and PCB
Duplexer 144/432mhz
Questo duplexer autocostruibile in pochi minuti , permette di operare con due antenne 144/435 separate con un RTX bibanda
Duplexer 144-430
Il duplexer e' un circuito che permette l'uso contemporaneo di piu' frequenze utilizzando una sola discesa di cavo
Economic power supply 13,8 V
Per effettuare le modifiche qui di seguito descritte bisogna avere adeguata praticità e conoscenze in campo elettrico ed elettronico
Electronic Circuits
There are 2777 circuit schematics available. The Last circuit was added on Thursday, November 28, 2019
170
This Wattmeter is in Elektor Magazine Oktober 2002, they will sell PIC and PCB
Questo duplexer autocostruibile in pochi minuti , permette di operare con due antenne 144/435 separate con un RTX bibanda
Il duplexer e' un circuito che permette l'uso contemporaneo di piu' frequenze utilizzando una sola discesa di cavo
Per effettuare le modifiche qui di seguito descritte bisogna avere adeguata praticità e conoscenze in campo elettrico ed elettronico
There are 2777 circuit schematics available. The Last circuit was added on Thursday, November 28, 2019
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