Re: QCX LPF 60m adjustments
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ian liston-smith
Thanks for the info guys.
I did measure all the LPF toroids on a peak LCR meter to be on or slightly under the inductance value in the table for 60m. I tweaked the windings a bit with the display module removed, but it didn't make much difference.
QCX inbuilt RF power meter says 4.54 W (but also 2.58 W on receive!) but both 50MHz scope and power meters give about 1 watt RF output on 60m.
Some of the LPF caps get very warm...
73/72.
Ian, G4JQT
From: QRPLabs@groups.io <QRPLabs@groups.io> on behalf of Hans Summers <hans.summers@...>
Sent: 29 April 2020 21:51 To: QRPLabs@groups.io <QRPLabs@groups.io> Subject: Re: [QRPLabs] QCX LPF adjustments Hi Ian
Yes, you can remove the LCD and power-up, once you are confident everything is working fine. I do this all the time, for making adjustments to the LPF toroid spacing. QCX works fine without the LCD; it only talks at the LCD, it does not check for any answer
back. So if the LCD is not present, the firmware doesn't notice or care.
73 Hans G0UPL
On Wed, Apr 29, 2020 at 11:34 PM ian liston-smith <ian.ls@...> wrote:
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