Re: QCX was OK #chat


Ian G4GIR
 

Hi Simas
 
Thanks for your reply. My symptoms are opposite to yours, I only get around 158mA @ 15V the PA transistors are cold, I have tested further and found that the output of IC1 Pin 6 is only around 1v pk-pk. I am worried it maybe a fault with IC1!!
 
I have removed all 3 PA devices and I still see only 2.5v PK-PK on the gates of the PA devices.
 
So it looks like a drive problem.
 
Will look at Q5  to see what the state of that is.
 
Again thanks for the info.
 
73
 
Ian G4GIR

From: Simas Pudziuvelis
Sent: Wednesday, October 4, 2017 5:12 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] QCX was OK #chat
 
I've had a similar problem, I could only get about 1W output, the transistors were really hot and it consumed 1.1A of power on 13V. I've fixed it by replacing Q5 transistor labeled as a RX/TX switch. then I got about 5W on 14.5V 0.6A
I hope this helps!

Simas, LY3EU

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