ΜBITX

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Revision as of 00:04, 13 August 2018 by Firespeaker (talk | contribs) (Created page with "Notes on µBITX assembly and use. == Assembly == Used a cookie tin as a case. Mic assembly. == Antenna setup == Inverted V dipole made with Amateur Radio Supplies [https:...")
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Notes on µBITX assembly and use.

Assembly

Used a cookie tin as a case.

Mic assembly.

Antenna setup

Inverted V dipole made with Amateur Radio Supplies 20m dipole antenna wire (two 18' strands, trimmed, wrapped around insulators, strung up in attic) and 450Ω window line.

QRPGuys Multi Z Tuner

QRPGuys 12W dummy load

Mods

Applied during assembly:

  • Added a fuse before diode (succeeded?)

Attempted after tested working:

  • Mitigating heat on LM7805:
    • Added a small 5V switching power supply before LM7805 (failed; created too much noise)
    • Relocation of LM7805 to case (succeeded, but got leads switched the first time and smoked the nano)
  • Dim LCD (failed—no effect)

Plan to attempt at some point:

  • TX LED
  • SWR meter
  • Red-on-black display (for night-time operation)
  • Foot-pedal controlled TX
  • Some sort of audio pre-processing?
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