Either levelling circuit has an open filter capacitor, so the signal is getting amplitude limited at low frequencies, or the levelling is oscillating because of an open tant, or has lost negative voltage rail to opamp.
Glad you are feeling better. I don't understand why there is an amplifier before the attenuator. I am just an arduino level hobbyist at this point so RF might as well be magic.
Hope you're better. The gold threaded rod belongs to the last RF power transistor in the chain. It's a transistor suited to stripline, I don't remember the package code now. It's the rod that was covered with the rubber.
Very interesting to see all the details of the modules. I wonder about the holes in the shielded compartment shown in 3:32. It looks like a construction that was used for a different purpose before. I know such kind of holes from my constructions but I wonder why they are in a serious product. They will not harm the quality but someone made them and they seem not to be of any use here.
I don't think it's the leveling circuit I noticed the the gain falling as frequency fell the leveling circuit is trying to do it's job and increase gain of 3 stage amp and they are going into clipping instead of adding gain so I believe you were on the right track to start with but it might be a transistor behaving funny at lower frequencies. hope you're feeling better soon.
Really sorry you were sick for such a long time. It doesn't get easier for us as we get older. Hope you fully recover soon.
Hope you're feeling better.
Wishing you a speedy and complete recovery. Great series, particularly enjoyed this one.
Either levelling circuit has an open filter capacitor, so the signal is getting amplitude limited at low frequencies, or the levelling is oscillating because of an open tant, or has lost negative voltage rail to opamp.
May the good health be with you! Glad you are on the right side of grass! And i Like your electronics videostories
Be well! Things are looking up on this instrument!
Thanks for these videos! And hope your feeling better!
Glad that you are on the road to recovery, even if not 100% yet. Please do take care and prioritize your health and well-being.
Glad you are feeling better.
I don't understand why there is an amplifier before the attenuator.
I am just an arduino level hobbyist at this point so RF might as well be magic.
Hope you're better. The gold threaded rod belongs to the last RF power transistor in the chain. It's a transistor suited to stripline, I don't remember the package code now. It's the rod that was covered with the rubber.
oh my gosh, you are right, didn't expect that.
Very interesting to see all the details of the modules. I wonder about the holes in the shielded compartment shown in 3:32. It looks like a construction that was used for a different purpose before. I know such kind of holes from my constructions but I wonder why they are in a serious product. They will not harm the quality but someone made them and they seem not to be of any use here.
I like your forceps, I have had mine for 50+ years now, and my father had some well before I was born :)
Still covid in Ca ? When was this filmed ?
I was in eastern Canada and airports in-between first week of June.
The amplifier devices look like MMICs
I don't think it's the leveling circuit I noticed the the gain falling as frequency fell the leveling circuit is trying to do it's job and increase gain of 3 stage amp and they are going into clipping instead of adding gain so I believe you were on the right track to start with but it might be a transistor behaving funny at lower frequencies.
hope you're feeling better soon.
Does it meaning the circuts before leveling circuit gets smashed when it gets loaded by leveling circuts?