Hi Just a word of warning with fault finding, do not plug the output of the 10Watt PA into your scope or VNA, the VNA will only handle a mW; always use a 30-40dB high power attenuator or a RF coupler,

#qsx #pa #problem

Thanks so much Hans! But there is no hurry, so please don't spend too much time on it, and certainly not before those QCX Mini's are out of the door ... hi. Luc ON7DQ

#pa #50w #mods #problem #qcx

Hi Brent, nothing to apologize every help is welcome. I found the failure, it was my fault, wrong assembling of the T203 transformer. Tnx Brent / Andrew for your replay and trying to help. Best 73 de

#problem #pa

Ron, You're right... and I am an idiot. Hans, sorry that I was being an idiot. Jason

#pa #30m

Don Well I stumbled into it, glad it worked. Maybe my first PA on 40m has this same issue. I damaged my original qcx troubleshooting it, so its in the queue to resolve. The 80m pair qcx plus and PA ar

#pa

Don Well same thing happened on my first qcx PA, that I did not troubleshoot yet. My guess, maybe I mismounted the triple winding transformer. Likely those things you mentioned are okay. I don't see a

#pa

On 40M its likely to be less an issue. As a kit it had to be buildable so its not so fussy. FTxx-xx ferrite is not metallic, its a ceramic, and nonconducting. So the real issue of nicked or scraped en

#pa

Note that these 2.54 mm strips are now sold by Amazon. Amazon also stocks a certain selection IC sockets. Typically 2 day shipping!

#pa #qcx #mods

Hi Halden I just measured one here, without enclosure, but including the two heatsinks: 266g 73 Hans G0UPL http://qrp-labs.com

#pa

Hi Josh, Congratulations on the successful completion of your kits! I read your comment about being painfully slow with Morse. I, too have been concerned with my proficiency with Morse code, and have

#20m #40m #pa #qcx #enclosure

I was using a RAVPower PD Pioneer 20000mAh powerbank to power the QCX @ 12V. This powerbank can deliver 5, 9, 12, 15 and 20V at 3A. Really neat. I have made a cable with a PD-trigger for 12v and one f

#pa

Very neat indeed, looks fabulous! 73s Ted 2E0THH

#qcx #pa

Ahh, I see that I did misread it. I thought the gates of the MOSFETs went to ground. In the words of Emily Litella..."never mind!"

#pa

I had a spare heat sink here and the pins pulled out very easily and were also very easy to insert in the other end. Vernon

#pa

A more politically correct one is "Better be right or your great big venture goes west." Roger K7RXV

#pa

The purpose of this mod is to give QCX access to a receive-only antenna via the 50 Watt PA kit. This can be added to a functioning PA or the kit can be built as a T/R switch without the amplifier circ

#mods #pa #80m #160m

And don't I know it!

#qcx #pa

Mike Well if you have not programmed the U3S via those 2 switches, you have more of the journey ahead. I remember the designer himself giving me a pleasant taunt over 6 filters to wind 3 toroids each

#pa

Not puzzled. But wondering about reliabity I think. Buy a second amp, build it for backup. If your amp fails again, you're covered. $29.

#pa

It doesn't work right or not full power if any. Allison ------------------------------- Please reply on list so we can share. No direct email, it goes to bit bucket due address harvesting in groups.IO

#pa