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Re: low output power

 

I recommend checking R131 and R141 and all the resistors around Q13, Q14.

When I checked the board with IR imager FLIR I found the resistors 141/142/143 getting quite hot. 40-50C, and a few boards have
had failures in these resistors.

Raj

At 05/09/2017, you wrote:

Try checking the main board for any components that are bad. I have heard of some boards being damaged. In all possibility, it's probably the IRF510. If you need any I believe I have some in a parts bin from my father when he was building a QRP cw rig. It's a part from mouser so it should be good. I'll have to find it though my lab is a mess.
Ian Litchfield KD2IXL?

On Sep 5, 2017 2:20 AM, "Nemo" <paulswift6@...> wrote:
These questions and answers al all very interesting. Now I have mine working but only 2 watts RF output when I shout at it that is. Im making an proved mic amp to get a bit more audio drive as it looks a bit low. If I can get 4 watts with 12 volt FC input I will be happy.
but I think the 510 is a bit soft and that's the main reason for a low output.
kind regards
Paul.(HS0ZLQ G0MIH)

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