Re: QCX+ RF Power #qcx


Ronald Taylor
 

Hi  David. On the 20 Meter version, some folks find that removing a couple of turns from L1, L2 and L3 will increase power output, if the issue is a lower than expected power output due to lower than expected cutoff frequency of the lowpass filter. You can also spread or squeeze turns on these toroids to get some improvement. I wouldn't remove more than 2 turns unless you have a spectrum analyzer to verify you are still meeting the spurious output requirements.

This turns removal is mentioned in the last sentence before the conclusion in Hans' troubleshooting procedure. https://qrp-labs.com/qcx/qcxtrouble.html
which is a very interesting and informative read..... 73 ... Ron


On Fri, Sep 11, 2020 at 10:46 AM David Griffiths <davidmgriffiths42@...> wrote:
Across the resistors Evan, before the diode.

David
G4DMG

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