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Wednesday, September 26, 2018

The Triple Scratch-Built BITX Club -- Do you qualify for membership?


OK, so how many of you guys can join Steve M0KOV and me in the Triple Scratch-Built BITX Club?  

Bill 

Below are my three Bitx builds.

1st build.  
Closely follows Farhan's original 20m design but I soon changed the VFO for an arduino/ad9850.  It was a fast, get me on the air build, it worked, but not well.
The output amp was built on a separate board as part of its exorcism. 

2nd build. 
This was to be my two band Hill Topper, we don't have mountains in Yorkshire. Built with separate stages slotting into the eddystone box to save space and to help with shielding. The receiver worked very nicely, the output kept blowing irf510's. I later found that they were a hopeless batch. Very hard to work on.



3rd build. Big is beautiful. Arduino/si5351 straight into the modulator and into the mini-circuit mixer through a driver as discussed. Norton feedback RF preamp and a ne5532/lm386 AF amp. At the moment it's on 80m but it did start on 40m. It's still a work in progress and I will have to sort that soldering iron band change.

73  Steve M0KOV

4 comments:

  1. This comment has been removed by the author.

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    Replies
    1. Nice work. I assume that soldering iron assisted band changing is called "hot switching" for the uninitiated.

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  2. I think I qualify, but to paraphrase Groucho Marx: I wouldn't want to belong to any organization that would have me as a member.

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  3. You're in Steve. Congratulations.

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