Category Archives: amplifier

Bitx20 transmit oddities continue

It’s been a few days with no updates on the blog but I’ve been VERY active in my downstairs lab.  Unfortunately, my Bitx20 is still having some problems. I have gotten a wealth of information from the bitx20 Yahoo group … Continue reading

Posted in amplifier, balanced modulator, bitx20, KD1JV digital display | Tagged | 1 Comment

Continued low Bitx TX; digital display started

I’m not sure I’m satisfied yet with the output of the rig.  Maybe it’s fine and I’m just ignorant of how these SSB homebrew rigs operate, but something seems wrong when the needle on the power meter only gets to … Continue reading

Posted in amplifier, bitx20, KD1JV digital display | 2 Comments

Bitx20 RF PA stability mods added

Today I went ahead and added the mods suggested to help stabilize the RF PA in the Hendricks Bitx kits.  Thanks to Alan G0RWB for this great clue in the comments of my previous blog entry.  It was specifically mentioned … Continue reading

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Follow-up on TX troubles (Bitx20)

Just as I’d said, once I post something to the blog (or mention to another ham) a problem with a rig, suddenly I start finding my own solutions.  Maybe next time I ought to post a note early in the … Continue reading

Posted in amplifier, bitx20 | 2 Comments

Kit finished, but TX troubles

Wouldn’t you know!  You get right to the end of a project taking months and everything works right up till the end. I finished the Hendricks Bitx20 kit a couple days ago but the TX is definitely not working as … Continue reading

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Oscillator honesty from ARRL; buffer and amp – dead JFETs

Let’s make the embarrassing confession right here at the beginning: Very few oscillators you see in published circuits or commercial equipment were designed by the equipment’s designer.  Almost all have been “Borrowed,” “Re-used” or just plain stolen.  While recycling in … Continue reading

Posted in amplifier, ARRL Handbook, buffer, Hartley, Mrad-40, oscillator | Leave a comment

1st TX IF amp and 2nd RX IF amp done; another circuit board made

Tonight I moved forward again with the Bitx20 Hendricks kit, building the 1st IF TX amp and the 2nd RX IF amp.  The above picture shows the testing done on the RX amp portion with my Altoids “curiously strong” outboard … Continue reading

Posted in amplifier, bitx20, manhattan style, ugly construction | Leave a comment