IC-8 pins 1,2,3,5,6, and 7 were 2.4v
IC-9 pin 1 was 4.77v, pin 2 was 4.77v, pin 3 was 4.44v, pin 5 was 2.4 v, pin 6 was 2.4v and pin 7 was 2.4v
IC-10 pin 1 was 12.58v, pin 2 was 12.58v, pin 3 was 12.58v, pin 5 was 11.16v, pin 6 was 11.34v and pin 7 was 12.58 v?
Thanks,
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On Mar 21, 2024, at 1:59?PM, Ronald Taylor <wa7gil@...> wrote:
?
Ok. Then you next should check the bias voltages on the op amp ICs 8,9 and 10. With your DVM you should see about 2.5v on pins 1,2,3,5,6&7 of IC 8 and on pins 5,6&7 of IC9. You should also see about 4.8v on pins 1,2&3 of IC9 and a bit less than half the input voltage on pins 1,2,3,5,6&7 of IC10. Please verify those voltages. Thanks¡.Ron
On Thu, Mar 21, 2024 at 12:31 David Delongchamp <
adukhntr@...> wrote:
?My max BPF adjustment was 9
On Mar 21, 2024, at 12:02?PM, Ronald Taylor <wa7gil@...> wrote:
?
Hi Dave. What signal level did you see when you did the bandpass filter adjustment??
Ron
On Thu, Mar 21, 2024 at 11:18 David Delongchamp <
adukhntr@...> wrote:
I just built a QCX version 3 PCB that I purchased from QRP Labs several years ago. Upon completion of the kit I am having volume issues. With the gain turned to max I can barely hear the tone. I noticed when doing the IQ balance that I could not get higher than 3 when the directions said turn the gain control mid way and you should tune at around 9. I could only reach 3 with max gain.
Have you heard of this problem? If so what can I do to resolve this issue.
A little more info on my QCX. I am using the newest ATmega 1.09A chip. In the build I changed R41 to 150 ohm, R42 to 1.2 Kohm and C31 to 2.2 micro farad this was to improve the keying envelope.
Any input would be greatly appreciated.
Dave
W6MRD
