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10W PA / QSX PA started drawing idle power without TX input pulled low. 5 messages
#qsx
#pa
#problem
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,
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,
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Andrew Lenton
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QCX and non-QRPLabs amplfier problem 5 messages
#pa
#50w
#mods
#problem
#qcx
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
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
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ON7DQ Luc
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#pa #problem 4 messages
#problem
#pa
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
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
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Frederico Gaiaz
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First try into dummy load - #30m #QCX+ with 50W 4 messages
#pa
#30m
Ron, You're right... and I am an idiot. Hans, sorry that I was being an idiot. Jason
Ron, You're right... and I am an idiot. Hans, sorry that I was being an idiot. Jason
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By
superDIYer
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50W PA Not Amplifying #pa - SOLVED 2 messages
#pa
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
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
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@CurtisM
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50W PA Not Amplifying 2 messages
#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
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
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@CurtisM
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50W AMP T1 TRIFILAR TOROID ISSUE 20 messages
#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
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
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ajparent1/KB1GMX
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QCX+ PA Mounting mod 2 messages
#pa
#qcx
#mods
Note that these 2.54 mm strips are now sold by Amazon. Amazon also stocks a certain selection IC sockets. Typically 2 day shipping!
Note that these 2.54 mm strips are now sold by Amazon. Amazon also stocks a certain selection IC sockets. Typically 2 day shipping!
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Ham Radio
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Mass or weight of QCX 50W Amp 2 messages
#pa
Hi Halden I just measured one here, without enclosure, but including the two heatsinks: 266g 73 Hans G0UPL http://qrp-labs.com
Hi Halden I just measured one here, without enclosure, but including the two heatsinks: 266g 73 Hans G0UPL http://qrp-labs.com
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Hans Summers
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New QCX+ 20/40m builds + PA's 2 messages
#20m
#40m
#pa
#qcx
#enclosure
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
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
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By
...
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Mean Well OWA-120E-20, power supply for 50W amp 6 messages
#pa
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
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
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Ben
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QCX+ and 50W amp, ready for action 4 messages
#qcx
#pa
Very neat indeed, looks fabulous! 73s Ted 2E0THH
Very neat indeed, looks fabulous! 73s Ted 2E0THH
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By
Ted 2E0THH
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10W HF Linear PA - Question on R209/R210 14 messages
#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!"
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!"
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Gwen Patton
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Pins For The Heat Sink On The Wrong End - 5W PA 6 messages
#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
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
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Vernon Matheson
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PA R27 doesn't match the color code in the instructions 18 messages
#pa
A more politically correct one is "Better be right or your great big venture goes west." Roger K7RXV
A more politically correct one is "Better be right or your great big venture goes west." Roger K7RXV
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By
Roger Steyaert
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#mods #pa #80m #160m 3 messages
#mods
#pa
#80m
#160m
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
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
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Richard Hall
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#qcx class e #pa #lpf..... or hunting for the optimum 21 messages
#qcx
#pa
And don't I know it!
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Jim Allyn - N7JA
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5 Watt PA IC1 Installation 6 messages
#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
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
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@CurtisM
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50 watt amp q1 / q2 failure 13 messages
#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.
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.
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By
George Korper
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50 Watt PA T1 3 messages
#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
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
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By
ajparent1/KB1GMX
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