On Mon, May 16, 2022 at 09:12 AM, Ozan wrote:
On Sun, May 15, 2022 at 11:49 PM, unclebanjoman wrote:
Do you put the attenuator at source side or at the plugin side?
Yeah, I always use this signal path: PG506 -> 80 cm coax -> x10 50 ohm attenuator -> 50 ohm feed-thru termination -> BNC of 7A16A
Does removing Q150 still clean up the waveforms? If you keep Q150 in place and
remove U350 does it change anything? This experiment is in case somehow
amplifier stage is loading Q150 output and it is not able to function as
source follower. I think you swapped U350 but there could be a fault in the
components around U350. The problem with this theory is final settled
amplitude is correct.
O.K. I will try with mooore calm this evening.
Otherwise cam switches of the attenuator (e.g. if one of the attenuator
sections is not completely isolated) and attenuator ground connections are
possible suspects. However, it doesn't explain behavior with Q150 removed.
I'm thinking the same. One test at a time and I will report to you ASAP.
Max
