microHAM u2R
firmware v2.0
microHAM · Released Jan 25, 2012 · First seen Sep 9, 2026
Source:
microham.com
v2.0 is not the latest firmware for the microHAM u2R: the current version is v3.5 (August 9, 2018). Go to v3.5
In short — summary by updatemystuff.com
PTT lead timing is now consistently applied based on current mode, not initiation method.
- Consistent PTT timing behavior across all initiation methods
- CW mode: simultaneous PTT start with delayed CW
- Non-CW modes: delayed PTT to PA/LNA
Written from microHAM's release notes, which are printed in full below.
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What's in this update
- PTT lead can be applied in two different ways:
(1) PTT is delayed to PA/LNA PTT (2) PTT is started simultaneously with PA/LNA PTT and CW is delayed Up to this version the second case was used only when PTT was initiated by WinKey or serial CW.
In all other cases (like foot switch, serial PTT, WK command PTT ...) the first way was used.
Since this version it is performed consistently with the current mode.
The second case is used in CW mode and the first case in all other modes regardless of what initiates PTT.
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