开云体育

Hi

I recently built a QCX+ for 60 mtrs. Everything works ok except that I only get about 1.5watts out into a dummy. load.? Just wondering whether any one has built a QCX+ for 60mtrs and what power? out? that is expected for this band .

look forward to any replies.

Keith G4TJE

?

Keith, you should be able to get a good 4 or 5 watts out on that band. Have you tried adjusting the lowpass filter toroid windings yet? I would suggest that you start with L3 and spread the turns as much as possible. If the power increases as you spread them and is still increasing when you get them spread as far as they will go, then remove one turn from L3 and check again. The best way to remove a turn is to heat the outer wire connection and lift it out of the hole. Then unwind a turn. Don't cut the wire and don't try to clean out the hole. Just tack solder the wire to the top of the board. If you have to remove another turn, do it the same way. When and only when you get them where you want them to be, trim the wires and reinstall. I usually just solder them to the top of the board instead of risking board damage trying to clean out the holes. Next, squeeze the turns on L2 a bit. If that increases power, squeeze them further until the power peaks and finally spread the turns on L1. In all cases, if the opposite happens when adjusting turns spacing just go the other way. You will need to play with all of them probably. Stop when you get to 4 or 5 watts. There is no advantage in going beyond 5 watts and it will only serve to shorten the life of the finals.

Hi Ronald

Many thanks for your reply. I have tried adjusting all the low pass filter windings and have taken 0ne turn off each toroid. At first I could only get 1 watt out and after adjusting the windings I managed to get a extra half watt out. I will have to take a look at the board to see if there are any bad joints etc. If you have any other suggestions I would be grateful for any advice. I have already build a 40 mtr version and that was ok with about 5 watts out so not to way this board is only giving me this low power.

73 Keith G4TJE

Hi Keith,

?

Have you tried any of the suggestions on the QCX troubleshooting page?

?

There is also a YouTube video by Hans on the QCX:

?

73

Evan

AC9TU

Keith, I don't think you needed to take any turns off L1 or L2. Yes, please watch the video Evan suggests. Hans shows his technique for doing the adjustments without cleaning holes in there as well.?

Hi Everyone

?

Thanks for all you advise and comments on my low power issue on my newly built QCX+ for 60 mtrs. After a lot of time playing around with the LPF I decided to restore all the toroid values to those in the assembly instructions, and then just removed 2 turns from L3 and my power went up from 1.5 watts to 2.5? watts, using 13.8 volts. I played with the coil spacings but was unable to improve the output so I have decided to leave it with a 2.5 watt output.

Thanks for all your help and hope to catch you the wireless soon

73 Keith G4TJE