Re: uBitx v.4 build information

Rubens Kamimura


I have uBITX v4 and use it only for FT8 in 40m, but the IRF510 outputs are burned, I am changing them, how do I check if the bias and power settings are correct?
a) I check the tension in the GATE or,
b) the current in the DRAIN?
c) the output power on FT8 at 40m (7,074 MHz), adjusted on VR1?

If I choose to use two IRF520 in place of the IRF510, should I make any changes? any recommendations?
73 from py2pvb
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Rubens Kamimura
Tel. (18) 3746-8680 ramal 116
Cel. (18) 9-9819-2225 WhatsApp ou (18) 9-9819-2255 

Em ter., 31 de mar. de 2020 às 11:49, flatpickn via Groups.Io <> escreveu:

Like some other folks, I have an unbuilt v.4. I've waited to build it until the dust settled over the fix for the harmonics and spurs. I've begun putting it together and realized how hard it is to find good information specific to the v.4. Not because it isn't there but because at the time the fixes and mods were written up they weren't identified as v.4. I'm not saying anyone was lacking in any way, it was the current version and people wrote issues, mods, and fixes. They didn't know that we'd later have a v.6 that was quite different from the v.4. 

Based on a comment by Curt in an earlier post (ubitx 4 - want a fresh start, need guidance) he posted a link with some great uBitx v.4 build information.   

I just wanted to put it here with an easily searchable title for other v.4 builders


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