History of designs leading to the v5 uBITx

The following list of circuit designs has been compiled by Tom KF5NWC:

Minima

A large group of enthusiasts worked with Farhan to create and test a general coverage receiver and multi-band transmitter called the Minima. Its simplicity, innovations such as its KISS mixer,  shuttle tuning using a potentiometer, and overall low build cost inspired hope of an affordable multi-band transceiver (to me anyways). 🙂

link to schematic

Ubitx v1

Continuing on with the general receiver concept with lessons learned from the minima, the uBitx was published.

link to schematic

uBitx v2

No schematics are known to have been published.

uBitx v3

The version 3 schematic is the version of the first production board from HFSignals.com (formally hfsigs.com).

link to download

uBitx v4

link to schematic on HFSignals

  • c210 and c216 – are listed as 0 pf and are not present on the board used in production by HFSignals.
  • Q942 and Q952 – are not populated on board sold by HFSignals. As sold by HFSignals, the final drivers for the PA are IRF510. These alternative pads allow experimentation such as replacing the IRF510’s RD15HVF1’s which are a different pinout.

uBitx v5

link to download

  • c210 and c216 – are listed as 0 pf and are not present on the board used in production by HFSignals.
  • Q942 and Q952 – are not populated on board sold by HFSignals. As sold by HFSignals, the final drivers for the PA are IRF510. These alternative pads allow experimentation such as replacing the IRF510’s RD15HVF1’s which are a different pinout.
Reference

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