70MHz-Transverter 10m/4m modified by Julian, G8HCZ see down
This transverter was built in 1994, a discription in three parts (german language) for DOWNLOAD as PDF-files. Circuit, printed-boards and layouts in the files
Download Part 1 Download Part 2 Download Part 3
New: Translation in English by Anwar, DL5DBM, Download as ZIP-File
RF-amplifier with FET BF256C, Mixer with MOSFET BF961
Crystal 22MHz, one stage
Push-pull 2x BF256C, amplifier BF961, driver 2N4427, output 300mW
300mW input, max. 6W output
Left filter for 50MHz
Input level can be reduced from 5W at 28MHz to a level of about 100mV/50Ohm for the TX-mixer.
The used TRX is a FT-890.
70MHz-Transverter 10m/4m modified by Julian, G8HCZ
The 50MHz-transverter was modified by Julian, G8HCZ for 70MHz. H e uses a 14MHz-cystal, tripled to 42MHZ and mixed with 28MHz for operating on 70MHz.
He describes the modifications with circuit-plans, which I have loaded as PDF-File.
For Download as PDF