New improved version! (2003.)

NF and Gain measurements:

(the best results)

144MHz: NF=0.4dB, Gain=26dB     (measured by YU1AW)

144MHz: NF=0.37dB, Gain=20.8dB     (measured by OK1UOW)

144MHz: NF=0.25dB, Gain=29dB     (measured by IZ4BEH)

432MHz: NF=0.38dB, Gain 22dB, P1dB=18dBm     (measured by S53WW)

432MHz: NF=0.4dB, Gain 19dB     (measured by YU1AW)

1296MHz: NF=0.4dB, Gain=17.7dB     (measured by S53WW)

1296MHz: NF=0.4dB, Gain=17.5dB     (measured by YU1AW)

IMPORTANT!

Old version modifications!  (2002.)

ATF54143 Preamplifiers Strongly Recommended Modifications

NEW VERSION PREAMPS

144 MHz - Built by Bernard, ON4CGX   

432 MHz - Built by Paja, ex YU2XO   

1296 MHz - Built by Paja, ex YU2XO   

144 MHz - Built and measured by Roberto, IZ4BEH  

1296 MHz, 432 MHZ and 144 MHz - Built by Ficza, YU7AA   

144MHz - Built by Anto, IK4PMB  

144 MHz, 432 MHZ and 1296 MHz - Built by Saša, YU1EO   

MODIFIED OLD VERSION PREAMPS

144 MHz - Built by Miloš, OK1UOW

                   

       

144 MHz - Built by Paja, ex YU2XO

1296MHz - Built by Aleš, S59MA

AutoCAD files in DWG format for Printed Circuit Boards: new version

ATF54143 144MHz - PCB    ATF54143 432MHz - PCB    ATF54143 1296MHz - PCB

All PCBs made of 1.6 mm double side FR4 or G10 epoxy (Er=4.8). Back side left as ground plane.

All used SMD components are type 1206.

AutoCAD files in DXF format for Printed Circuit Boards: new version

ATF54143 144 MHz - DXF    ATF54143 432 MHz - DXF   ATF54143 1296 MHz - DXF