marți, 30 octombrie 2012

New version of my 4m band transverter


Few pictures of my new project "Home made SMD transverter for 4 meter band":

This project is not finished yet, I have to make the shield box and some power amplifier (QRP of course, no more then ten watts). The target is to build the xverter in an small box  for use with my FT-857D. 
PCB-components side
PCB - components side
The size of PCB is only 70 x 50 mm. 
Transmit:
-The device can easy handle 5 Watts of RF Power to the input (delivered from transceiver) thanks to the 50 Ohm dummy load  ( two parallel resistors 100 ohm/3W each). 
-The switching is fully automatic (using RF VOX circuit on the transceiver side). 
-The output power is around 400mW on 50 ohm load, using the 2N4427 (Motorola) transistor.

Receive:
On Rx I used a classic configuration with two low noise MOSFET's (BF996S) and the results are very fine.  
The oscillator is also classic...nothing special, but is doing the job.


PCB - solder side
                           
Schematic diagram 
Printed circuit board

Some older version of 4 meter band transverter:

The setup with old transveter (6m to 4m)
The motherboard of 6m to 4m tansverter

Schematic diagram

Inside view
Schematic diagram
Old PA 10Wout with KT 606 - driver and BLY 88 - final

Other version of  10m to 4m transverter used before with IC-756PRO


Mother board and 10w-PA of  10m to 4m transverter (older version)

To be continued...

                                                     




                                                   

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