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Hi Dave,

The cheapest and easiest way to achieve ~20w output is to supply a higher voltage to just the PA part of the uBitx.? For version 3-5 at least there is a separate input pin on the PCB for supplying a different voltage to the PA. I don't have a v6 so cannot tell if that has a similar design, but even if it doesn't it should be easy to look at the schematic and find a suitable place for cutting a track and supplying a separate PA voltage.?

I have a Li-ion battery pack for portable use, it is around 18-20v and with this I get around 20-25w output on the lower bands which is what I use. I have added an internal 7812 12v regulator to feed the 12v input with 12v from same battery, this needs to be mounted on metal in order to have cooling, and i have done the same with the 7805 5v regulator on the radiuno?which I found to get a bit hotter than what I find comfortable. One could use DC-DC converters instead, but there is a high risk of interference from them so beware.

Do NOT supply 20v to the entire uBitx as that will let the magic smoke out.

Even without modifying to have a single power input, having 2 battery packs for separate voltages should be cheaper than an external PA....

Regards,?

Jonas - SM4VEY

Den s?n 24 okt. 2021 kl 16:35 skrev Dave Space <davesspacebar@...>:

Hi are there any relatively easy ways with a 12v supply to increase the uBit v6 to 20-25watts mods or external amp.?
I'd like an amplifier for portable use.??

Dear WYC,?

Hope the attached MODIFICATION can?

be done now for increasing RF POWER to?

25w.? I will ARRANGE Seperate HIGH V A

DC.?

Best of 73s.??

? ??

On Mon, Oct 25, 2021, 3:35 PM Jonas Sanamon <sanamon@...> wrote:

Hi Dave,

The cheapest and easiest way to achieve ~20w output is to supply a higher voltage to just the PA part of the uBitx.? For version 3-5 at least there is a separate input pin on the PCB for supplying a different voltage to the PA. I don't have a v6 so cannot tell if that has a similar design, but even if it doesn't it should be easy to look at the schematic and find a suitable place for cutting a track and supplying a separate PA voltage.?

I have a Li-ion battery pack for portable use, it is around 18-20v and with this I get around 20-25w output on the lower bands which is what I use. I have added an internal 7812 12v regulator to feed the 12v input with 12v from same battery, this needs to be mounted on metal in order to have cooling, and i have done the same with the 7805 5v regulator on the radiuno?which I found to get a bit hotter than what I find comfortable. One could use DC-DC converters instead, but there is a high risk of interference from them so beware.

Do NOT supply 20v to the entire uBitx as that will let the magic smoke out.

Even without modifying to have a single power input, having 2 battery packs for separate voltages should be cheaper than an external PA....

Regards,?

Jonas - SM4VEY

Den s?n 24 okt. 2021 kl 16:35 skrev Dave Space <davesspacebar@...>:

Hi are there any relatively easy ways with a 12v supply to increase the uBit v6 to 20-25watts mods or external amp.?
I'd like an amplifier for portable use.??