¿ªÔÆÌåÓý

ctrl + shift + ? for shortcuts
© 2025 Groups.io

Re: Problems with QCX build, guidance needed please


 

¿ªÔÆÌåÓý

Also check for continuity from the center conductor of the antenna bnc connector through L3. If you don¡¯t have continuity then you probably have not adequately removed the enamel from those torroids. Check L4 also.


On Jan 26, 2023, at 6:42 PM, Mark, WD4ELG <wd4elg@...> wrote:

?

Gary and Ron, thanks for the help; I greatly appreciate it.?

?

Made some progress tonight:

?

Took another look with DVM and magnifier at T1, and noted that several of the wires on T1 did not have solid contact due to enamel ¨C fixed!

Counted the turns on T1 and confirmed that I wired it for 40 meters, which matches the capacitors in the filter.

Powered up the unit and went into menu 8.7 for Peak BPF, and saw ? deflection/level.? C1 adjustment had no impact on the level, but I thought that since I had good indication that everything should be OK.

Went to menu 8.8 ?I-Q bal and saw a minimal deflection.

Went to menu 8.9 for Phase Lo and saw no deflection.

Went to menu 8.10 and saw no deflection.

?

So everything should be good for initial alignment (according to my understanding).

?

Hooked up the 40 meter dipole antenna and plugged in some earbuds¡­..nothing heard.? ARGH!

?

Pressed down on the CW microswitch and listened on a separate receiver, no output signal heard.? ARGH!

?

Went to menu #9 to use some of the test equipment.

Menu 9.3, value is 0 regardless of the RF gain knob setting.? Same with value for 9.4,? Not good.

Looking at page 104, section 5.1 of the Block diagram ¨C doesn¡¯t really help me much with further investigation.

Looking at page 105, the complete schematic looks impressive, but it also doesn¡¯t help me much with further investigation.

?

So I am dealing with two separate issues:? CW microswitch is not activating transmit, and bigger issue is no audio output to the headphones.

?

Ron, before I replace IC5 (because I am still seeing the same voltage values as before), I don¡¯t understand how this voltage would cause the issues I am seeing now.??

?

(Not sure if Hans provides IC5 or if I should just order a new kit (is the QCX+ made with the same IC5?)

?

Mark Lunday, WD4ELG

Join [email protected] to automatically receive all group messages.