RPA-1 Man

Hi Greg, 

I sent Dennis a message yesterday regarding my concern and am awaiting a reply. Thanks for the clarification though. I appreciate it. 

Just to update you, I did receive the components to populate the board this week but am waiting on the standoffs so it can be mounted in the chassis. 

Paul

Honestly, I'm debating if I want to put the Gundry mod in the first generation C-9 knowing that Dennis is having issues getting it to work properly with yours. Are his troubles related to getting the mod working properly or were there issues prior to that?

Hi Greg,

I feel like such a DOLT! The issue I was experiencing was me. Lol! I had accidentally swapped the RCA inputs/outputs at the usb interface I use to connect to the computer. What a dumb mistake! Anyway, just wanted to let you know. Please try not to judge me for this brain fart. 😄

Any news on your C-9?

Best Regards,

Paul

Hi Greg,

I would like to take the time to draw up a schematic but it will be time consuming. I have found differences such as resistor values and slight design differences between the 1st and 2nd generation units. I've mostly had to follow traces to make some sense out of this thing. It is a challenge but I don't give up easily. I'm too damned stubborn for that. I will let know if I need anything and any progress I make. 

Paul

About as far as I've gotten is labelling the resistors and identifying which IC's are 1,2,3,4 and 5. What are you trying to identify?

The timing of this message is impeccable as I was about to reach out for help myself. I was testing the phase shift response of my unit per the service manual for the second generation unit and it all looked great right down to the phase shift  at 360 degrees being at 8.55 Khz but when doing final testing of frequency response it is now messed up. When doing the "both channels driven" test it looks fine but when the channels are driven individually the results totally fail. I've been pulling my hair out trying to figure it out for the past two days.

Regards,

Paul