It doesn't trigger reliably at the moment, ...
Ha! Found it!
I can't believe YHP used those pointer knobs to hold the push button lever mechanisms onto the switches, just seems wasteful.
Must be an early one too, judging by the blue grey covers.
David
Buy now, regret later
Knipex
I can't believe YHP used those pointer knobs to hold the push button lever mechanisms onto the switches, just seems wasteful.
Must be an early one too, judging by the blue grey covers.
David
The manual from 1973 for up to 1212J-00590 has the knobs on side 6-20 last position listed:
04342-3261 KNOB:ROUND BLACK 1 ARROW 7 REQ'D
I did not find any change in section VII.
So i think the alu clamps at https://everist.org/NobLog/20130215_The_Q_meter.htm are not original. Perhaps someone harvested and upcycled the knobs.
With cheap i meant that they were a series part ready available - a 10 cent article - compared to the precission mechanical parts they disappear in the noise. The perspective 50 years later is completly different. As they tend to get brittle, they are nowadays expensive and hard to get.
I'm going to throw this out there since I know many of you have encountered ham radio operators. And in this case, an aspiring ham radio operator.
What's the deal with the scanners blaring constantly whenever you have to talk to one of these people? I hate having to alternately have to shout over and hear through the noise of their scanners. If you're talking to someone, turn it off or turn it well down.
Well, I'm not a ham but my scanner is going constantly. But I do have the common sense and decency to switch it to mute when talking on the phone or if I have a visitor. And it's also on mute if I'm watching TV.
The only time it's switched off is when the Lady Cop is here. She has made it abundantly clear that the last thing she want's to hear when off duty is radio calls. I guess I can't blame her.
It also begs the question, why is it on mute if you're watching TV, why not turn it off, I mean if anything remotely interesting is going to happen on the radio, you'll miss it anyway.
I'm going to throw this out there since I know many of you have encountered ham radio operators
What's the deal with the scanners blaring constantly whenever you have to talk to one of these people?
It doesn't trigger reliably at the moment, ...
Ha! Found it!It's staring right at ya !
D3 rising edge on an idle high bus.
I can't believe YHP used those pointer knobs to hold the push button lever mechanisms onto the switches, just seems wasteful.
Must be an early one too, judging by the blue grey covers.
David
The manual from 1973 for up to 1212J-00590 has the knobs on side 6-20 last position listed:
04342-3261 KNOB:ROUND BLACK 1 ARROW 7 REQ'D
I did not find any change in section VII.
So i think the alu clamps at https://everist.org/NobLog/20130215_The_Q_meter.htm are not original. Perhaps someone harvested and upcycled the knobs.
With cheap i meant that they were a series part ready available - a 10 cent article - compared to the precission mechanical parts they disappear in the noise. The perspective 50 years later is completly different. As they tend to get brittle, they are nowadays expensive and hard to get.Only the designer knows for certain why they used knobs rather than collars. I can suggest a few possibilities:
1/ Slightly larger diameter stops the levers rattling. A custom collar is >>$$ than standard knob.
2/ Added mass to ensure correct operation of the latch spring in the switch. Things that work with human "feedback" can be troublesome when automated.
3/They were on hand when they built the prototype and just got carried through to production.
I think 2/ is a possibility
Next up with is the little multifunction tester which I put through it’s paces with a random assortment of junk box parts from the retired Nortel engineer’s cookie tin of doom:
...snip...
I'm not surprised at the result here. This was a junk box 7805 linear regulator.
...snip...
Anyhow, that's it for test equipment for today for me. I'm about to head over to a friend's house for a little Christmas get together and need to stop to pick up a dessert on the way. Tis the season. As much as I enjoy the gatherings with friends, the longstanding hatred I have for the season lurks in the background regardless.
Next up with is the little multifunction tester which I put through it’s paces with a random assortment of junk box parts from the retired Nortel engineer’s cookie tin of doom:
...snip...
I'm not surprised at the result here. This was a junk box 7805 linear regulator.
...snip...
Anyhow, that's it for test equipment for today for me. I'm about to head over to a friend's house for a little Christmas get together and need to stop to pick up a dessert on the way. Tis the season. As much as I enjoy the gatherings with friends, the longstanding hatred I have for the season lurks in the background regardless.
Are these even designed to test voltage regulators? Can't help thinking I've read they can't test them somewhere before too.
David
Next up with is the little multifunction tester which I put through it’s paces with a random assortment of junk box parts from the retired Nortel engineer’s cookie tin of doom:
...snip...
I'm not surprised at the result here. This was a junk box 7805 linear regulator.
...snip...
Anyhow, that's it for test equipment for today for me. I'm about to head over to a friend's house for a little Christmas get together and need to stop to pick up a dessert on the way. Tis the season. As much as I enjoy the gatherings with friends, the longstanding hatred I have for the season lurks in the background regardless.
Are these even designed to test voltage regulators? Can't help thinking I've read they can't test them somewhere before too.
David
The part number starting with 04342 instead of 0370 suggests the knobs are a custom or modified part.
The later 4342A on the memory project website has the exactly the same metal clamps, suggesting they were changed at some point in production.
https://www.hpmemoryproject.org/pict/wall_b/anim/4342a_q90/viewer.htm
David
Tektronix P6046, 100MHz differential probe:
Frequency response of the P6046 (Green) from DC to 500MHz, 50MHz per division. Noise source in Cyan.
Tektronix P6046, 100MHz differential probe:
Frequency response of the P6046 (Green) from DC to 500MHz, 50MHz per division. Noise source in Cyan.
Just wondering.... what's up with all those spikes/glitches with that diff probe ? What could be causing them, what do they mean ?!
Pulled the trigger on a brand new 344654A, should be here around new years hopefully, pretty excited.
Got it for the $16xx price, within hours of the purchase Newark revised the price up to $25xx. I guess that is the inflation observed in real time, still, it made me feel better about a big ticket purchase I was having some anxiety about.