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Santa Claus ....
printing is not environmentally green, eats trees, uses lots of ink, not cheap I could go on but it has all been said before.
printing is not environmentally green, eats trees, uses lots of ink, not cheap I could go on but it has all been said before.
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By
howard winwood G4GPF
· #66336
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QLG2 Display problem
definitely not wired correctly.
definitely not wired correctly.
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By
howard winwood G4GPF
· #66780
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QCX-mini failure on new build
I think you are on the wrong track, a bad power supply or solder joint CAN NOT screw up the processor, try thinking through the process logically rather than assume. The processor either works or it d
I think you are on the wrong track, a bad power supply or solder joint CAN NOT screw up the processor, try thinking through the process logically rather than assume. The processor either works or it d
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howard winwood G4GPF
· #67584
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NanoVNA and LPF?
Thats how I did mine, just used some perf board and socket strips aligned with filter pins, Surprising how easy it is and you can see the performance of the filter as you adjust.
Thats how I did mine, just used some perf board and socket strips aligned with filter pins, Surprising how easy it is and you can see the performance of the filter as you adjust.
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By
howard winwood G4GPF
· #67668
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Non degreed engineers
Ahh! that explains it all :-)
Ahh! that explains it all :-)
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howard winwood G4GPF
· #68418
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QCX-mini Alignment Problem
These are multi turn pots, you may have to turn them quite a lot before something happens, I think the instructions mention setting them half way before Installing.
These are multi turn pots, you may have to turn them quite a lot before something happens, I think the instructions mention setting them half way before Installing.
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howard winwood G4GPF
· #71332
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LCD blank
Something wrong with the LCD - unlikely Something wrong with ic2 - unlikely Something YOU have done wrong - likely. If you cannot read/trace a schematic you should not be building these kits - sorry!
Something wrong with the LCD - unlikely Something wrong with ic2 - unlikely Something YOU have done wrong - likely. If you cannot read/trace a schematic you should not be building these kits - sorry!
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By
howard winwood G4GPF
· #71368
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LCD blank
The truth hurts sometimes. When building any kind of electronic kit requires the builder to have some knowledge of fault finding and reading a schematic, without these you are on a hiding to nothing.
The truth hurts sometimes. When building any kind of electronic kit requires the builder to have some knowledge of fault finding and reading a schematic, without these you are on a hiding to nothing.
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By
howard winwood G4GPF
· #71406
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Is my QDX destroyed?
Time and time again, this has to be repeated, BEFORE any attempt at powering up ANY self assembled electronics, you should perform simple checks with an Ohmeter, both on the 12v input AND the regulato
Time and time again, this has to be repeated, BEFORE any attempt at powering up ANY self assembled electronics, you should perform simple checks with an Ohmeter, both on the 12v input AND the regulato
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By
howard winwood G4GPF
· #75405
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Is my QDX destroyed?
800ma current limit is far too high, I would set the limit as low as possible raising it gradually as you watch the voltage. With a very low current limit the voltage will drop to a very low value, if
800ma current limit is far too high, I would set the limit as low as possible raising it gradually as you watch the voltage. With a very low current limit the voltage will drop to a very low value, if
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By
howard winwood G4GPF
· #75407
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Is my QDX destroyed?
IF there is a short circuit that caused the voltage regulator to fail then the following electronics MAY still be ok. PA4Q says he has replaced IC1 but things still not working leads to an obvious con
IF there is a short circuit that caused the voltage regulator to fail then the following electronics MAY still be ok. PA4Q says he has replaced IC1 but things still not working leads to an obvious con
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howard winwood G4GPF
· #75410
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Is my QDX destroyed?
sorry my friend, a fuse will not save you in the initial stages of powering up your construction. It MAY protect things once everything passes all the initial startup tests. Semiconductor devices/ic’s
sorry my friend, a fuse will not save you in the initial stages of powering up your construction. It MAY protect things once everything passes all the initial startup tests. Semiconductor devices/ic’s
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By
howard winwood G4GPF
· #75474
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Is my QDX destroyed?
Because under normal conditions it is not required. There are lots of protection circuits but are they worth the effort. If things are built correctly there is no need for protection circuitry. Most c
Because under normal conditions it is not required. There are lots of protection circuits but are they worth the effort. If things are built correctly there is no need for protection circuitry. Most c
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By
howard winwood G4GPF
· #75483
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IS THE BS 170 MOUNTING SYSTEM IN THE MINI A GOOD IDEA?
Instead of all the hoohah about QCX mini overheating of BS170’s, if you are going to use modes that have 100% duty cycle, why not run the mini on 9v, the power drop at the finals will not be noticed o
Instead of all the hoohah about QCX mini overheating of BS170’s, if you are going to use modes that have 100% duty cycle, why not run the mini on 9v, the power drop at the finals will not be noticed o
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howard winwood G4GPF
· #75881
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IS THE BS 170 MOUNTING SYSTEM IN THE MINI A GOOD IDEA?
The metal washer is NOT the heatsink, the washer only serves to hold down the transistors on the PCB copper with IS the actual heat sink.
The metal washer is NOT the heatsink, the washer only serves to hold down the transistors on the PCB copper with IS the actual heat sink.
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howard winwood G4GPF
· #75889
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IS THE BS 170 MOUNTING SYSTEM IN THE MINI A GOOD IDEA?
Taken from the mini build manual:’- A Class-E power amplifier is a wonderful thing. It has a very high efficiency, sometimes over 90%. This has several important benefits: a) Since not much power is d
Taken from the mini build manual:’- A Class-E power amplifier is a wonderful thing. It has a very high efficiency, sometimes over 90%. This has several important benefits: a) Since not much power is d
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howard winwood G4GPF
· #75953
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QCX Mini Rev 1 no audio
#40m
did you set the three trimmers at half way? don’t forget these trimmers are multi turn and you may have to adjust them for quite a few turns until something happens on the display.
did you set the three trimmers at half way? don’t forget these trimmers are multi turn and you may have to adjust them for quite a few turns until something happens on the display.
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howard winwood G4GPF
· #76210
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QCX 40m LPF
I think most on here who have built the 40m version, have used number of turns as shown in manual and found `NO `need to alter the number of turns. After alignment I was getting about 2.5 to 3 w outpu
I think most on here who have built the 40m version, have used number of turns as shown in manual and found `NO `need to alter the number of turns. After alignment I was getting about 2.5 to 3 w outpu
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howard winwood G4GPF
· #77816
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QCX mini troubleshooting begins
On the QCX mini there were one or two people who found that the BNC connector did not sit right on the pcb. The best way to sort the sockets on this edge of the pcb is to put them in place but NOT yet
On the QCX mini there were one or two people who found that the BNC connector did not sit right on the pcb. The best way to sort the sockets on this edge of the pcb is to put them in place but NOT yet
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By
howard winwood G4GPF
· #77977
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Output power problem
#qcxmini
What prompted you to rewind the toroids?
What prompted you to rewind the toroids?
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By
howard winwood G4GPF
· #81156
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