开云体育

QCX constant keying

John Mazzone All Messages By This Member #20718 Just got finished building the QCX 20 meter rig. rx was perfect but low power on the output. somehow after removing and replacing the filter torrids a few times now the rig just stays keying. If straight key is selected then constant keydown. if bug is selected then just? one continues string of dits. Before I go tearing everything apart, does anyone have any suggestions? Been there done that??
David Rushworth All Messages By This Member #20720 Sounds like you have created a short to ground on IC2 pin 19.? Confirm with a multi-meter and take a close look over the PCB with a lamp and magnifying glass looking for a solder splash. feedback to the group how you go with the issue and fix. ? 73 David VK2JDR
barry NF1O All Messages By This Member #20723 开云体育 My QCX does the same thing. I found that I apparently sparked pin 19 (I think) of the micro controller. It is grounded internally and does that I have a new chip on the way. Barry NF1O
John Mazzone All Messages By This Member #20732 开云体育 Pin 19 has about 300ohms to ground. If I pull the IC the pad is infinite to ground. John Mazzone N2EIK On 1/13/2018 6:57 PM, John Mazzone wrote: toggle quoted message Show quoted text Just got finished building the QCX 20 meter rig. rx was perfect but low power on the output. somehow after removing and replacing the filter torrids a few times now the rig just stays keying. If straight key is selected then constant keydown. if bug is selected then just? one continues string of dits. Before I go tearing everything apart, does anyone have any suggestions? Been there done that??
William Martin #20767 John, Check the stereo key jack. ?Sounds like one of the jack's connections are shorted to ground. Bill N7EU
David Rushworth All Messages By This Member #20786 If it's still keying with the pin lifted then the ic leg input is likely damaged and a new processor ic will be required.

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