A very inexpensive 12Ghz Frequency counter by Ve1ALQ. FMM110VJ,    Home

1 to    12 Ghz  / 8  Pre-Scalar from Fujitsu.

Milled Brass Carrier and PCB Assay.     GaAs MMIC & PCB Installed.        Bottom side of  Brass Carrier,

                                                                                                               With +5V regulator installed

 

The brass carrier  is  milled form a 3.4cm X 3.0cm X 2.4cm brass block.   Each side of the 

brass block is milled

out leaving a 3mm thick floor separating the regulator and divide by 8 MMIC circuit.                                                                    

 

When  soldering in the PCB the solder side should have ground area edges  soldered to the 

brass carrier as well.

 

In my circuit I use the +5V circuit and pin 8 output is not used, but is connected to the +5V 

as shown. Each 50 ohm resistors are made up of 2 X 100ohm 1% chip resistors.

 

These devices are available from Fujitsu   USA at a cost of $37.00 US funds each.  They do 

have a minimum billing of $200.00US, that can easily be overcome by getting together 

with others to increase quantity ordered. The performance of the device in my 

system is nearly identical to the spec. sheet provided with the device and works very, 

very well. PDF File for the FMM110VJ

 

When soldering the MMIC onto the PCB first place a touch of solder to the belly (underside)

 of the device, align very carefully  and apply enough heat to the ground area near the 

device to melt the solder on the device. This provides better heat sinking for the device 

than simply using thermal compound.       

If anyone has a question that I might be able to answer I can be 

contacted via:     

Phn: 1 506 738-2734.  

FAX:  1 506 734-8512,  

E-mail:                                                                                                                                                                

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