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Month: November 2016

bitx mods

I added an arduino/SI5351 vfo that I had previously made for a dc receiver to my new bitx40 module. I tweaked the arduino code to add the offset, and added a low pass filter to the output of the SI5351. On the bitx board, I desoldered a leg of the L4 coil and plugged the output of the SI5351 to the DDS pins and it worked perfectly.

Here is the code that I used for the vfo. It still needs some cleanup and I plan to add a few more features, but it is enough to get the vfo working. It is based on code from Jason Mildrum, NT7S, Przemek Sadowski, SQ9NJE, and Tom Hall, AK2B.

 

bitx_mod_2_web

I found this circuit for an s meter and put it together on a small breadboard and used an old s/swr meter. It works okay, but it needs some work. I will probably add an swr bridge and use the same meter for both.

smetercircuit

bitx_mod_1_web

 

I still need to put it all together in a box. I looked at buying a bending brake and some sheet metal, but it was just too pricey for me at the moment. I did find an old rack mount firewall that has a built in 12v power supply that I may try to use if I can fit everything inside.

 

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