On Wed, 29 Sep 2021 11:54:24 -0400, legg <legg@nospam.magma.ca> wrote:>On Tue, 28 Sep 2021 09:18:18 -0700, jlarkin@highlandsniptechnology.com >wrote: > >>Everything that conducts is a lossy transmission line. >> >>A solenoid inductor. >> >>https://www.dropbox.com/s/b5eae1jwsdscw4k/PC_3.jpg?raw=1 >> >>A series string of surface-mount resistors. >> >>A ground plane or power pour. >> >>A wound-foil capacitor. >> >>A wirewound resistor. >> >>A piece of wire in free air. >> >>A via. >> >>A pcb trace, of course. > > >. . . and Ground is everywhere. > >RLI suppose that the solenoid impedance wig-wags every turn, as the loops swing close to the PCB ground plane. I can't resolve that. -- Father Brown's figure remained quite dark and still; but in that instant he had lost his head. His head was always most valuable when he had lost it.
txlines
Started by ●September 28, 2021
Reply by ●September 29, 20212021-09-29
Reply by ●September 29, 20212021-09-29
bitrex wrote:> On 9/28/2021 12:18 PM, jlarkin@highlandsniptechnology.com wrote: >> Everything that conducts is a lossy transmission line. >> >> A solenoid inductor. >> >> https://www.dropbox.com/s/b5eae1jwsdscw4k/PC_3.jpg?raw=1 >> >> A series string of surface-mount resistors. >> >> A ground plane or power pour. >> >> A wound-foil capacitor. >> >> A wirewound resistor. >> >> A piece of wire in free air. >> >> A via. >> >> A pcb trace, of course. >> >> >> > > What if ur brain is a lossy transmission lineThat implies his thoughts radiates to others. -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
Reply by ●September 29, 20212021-09-29
bitrex wrote:> On 9/28/2021 12:26 PM, jlarkin@highlandsniptechnology.com wrote: >> On Tue, 28 Sep 2021 12:22:54 -0400, bitrex <user@example.net> wrote: >> >>> On 9/28/2021 12:18 PM, jlarkin@highlandsniptechnology.com wrote: >>>> Everything that conducts is a lossy transmission line. >>>> >>>> A solenoid inductor. >>>> >>>> https://www.dropbox.com/s/b5eae1jwsdscw4k/PC_3.jpg?raw=1 >>>> >>>> A series string of surface-mount resistors. >>>> >>>> A ground plane or power pour. >>>> >>>> A wound-foil capacitor. >>>> >>>> A wirewound resistor. >>>> >>>> A piece of wire in free air. >>>> >>>> A via. >>>> >>>> A pcb trace, of course. >>>> >>>> >>>> >>> >>> What if ur brain is a lossy transmission line >> >> What if you posted something intelligent about electronic design? >> >> > > The brain conducts! I know an elderly person who had ECT for psychosis > one time, it was miraculous. >Was that outlawed by the 1800s as being destructive, and inhumane? Besides, "results" were all over the map. Might work in your case... -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
Reply by ●September 29, 20212021-09-29
John Larkin wrote:> On Tue, 28 Sep 2021 15:21:42 -0700, John Robertson <spam@flippers.com> > wrote: > >> >> On 2021/09/28 1:51 p.m., John Larkin wrote: >>> On Tue, 28 Sep 2021 16:32:54 -0400, bitrex <user@example.net> wrote: >>> >>>> On 9/28/2021 3:30 PM, John Larkin wrote: >>>>> On Tue, 28 Sep 2021 11:04:15 -0700, John Robertson <spam@flippers.com> >>>>> wrote: >>>>> >>>>>> On 2021/09/28 9:18 a.m., jlarkin@highlandsniptechnology.com wrote: >>>>>>> Everything that conducts is a lossy transmission line. >>>>>>> >>>>>>> A solenoid inductor. >>>>>>> >>>>>>> https://www.dropbox.com/s/b5eae1jwsdscw4k/PC_3.jpg?raw=1 >>>>>>> >>>>>> ... >>>>>>> >>>>>>> >>>>>> >>>>>> Do you mind showing your test setup to get that trace? You must have a >>>>>> back-emf diode on the coil, but that diminishing slope looks wrong... >>>>> >>>>> >>>>> The setup is in the picture. The inductor goes between an SMA >>>>> connector and ground. The scope trace is 50 ohm TDR. >>>>> >>>>> Closeup: >>>>> >>>>> https://www.dropbox.com/s/6kzbwo87olh8am3/PC_1.jpg?raw=1 >>>>> >>>>> Given a voltage step from a 50 ohm source, one would expect an >>>>> inductor to have a spike of the applied step voltage, and an >>>>> exponential decay towards ground with time constant L/50. What's cool >>>>> is the initial flat, with the winding acting like a transmission line >>>>> roughly 800 ps round-trip. >>>>> >>>>> I think. >>>>> >>>> >>>> If I remember correctly at one time before it was known whether fiber >>>> optics would be feasible, the telcos were going to use helix microwave >>>> wave-guides for "broadband" data transmission >>> >>> There were trials done using light, in a pipe guided by thermal >>> gradients. >>> >>> I remember when hills had giant sugar-scoop microwave antennas. Now >>> they have cell towers. If we get gen5 or 6 cellular, all that will be >>> gone. >>> >> >> We still have scoops on our telco (Telus) building here in Vancouver at >> Boundary and Kingsway. There is an obvious missing connection to the >> building from the bottom of each scoop: >> >> https://goo.gl/maps/cYVDeKiqzPu13zGu5 >> >> John :-#)# > > Some guys at Bell Labs discovered the universe's background radiation > with a big scoop antenna. The initial noise figure was unaccountably > high until they evicted some pigeons from inside. >Any time of flight measurements? -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
Reply by ●September 29, 20212021-09-29
On Tue, 28 Sep 2021 12:28:56 -0400, bitrex <user@example.net> wrote:>On 9/28/2021 12:26 PM, jlarkin@highlandsniptechnology.com wrote: >> On Tue, 28 Sep 2021 12:22:54 -0400, bitrex <user@example.net> wrote: >> >>> On 9/28/2021 12:18 PM, jlarkin@highlandsniptechnology.com wrote: >>>> Everything that conducts is a lossy transmission line. >>>> >>>> A solenoid inductor. >>>> >>>> https://www.dropbox.com/s/b5eae1jwsdscw4k/PC_3.jpg?raw=1 >>>> >>>> A series string of surface-mount resistors. >>>> >>>> A ground plane or power pour. >>>> >>>> A wound-foil capacitor. >>>> >>>> A wirewound resistor. >>>> >>>> A piece of wire in free air. >>>> >>>> A via. >>>> >>>> A pcb trace, of course. >>>> >>>> >>>> >>> >>> What if ur brain is a lossy transmission line >> >> What if you posted something intelligent about electronic design? >> >> > >The brain conducts! I know an elderly person who had ECT for psychosis >one time, it was miraculous.Oh. I suppose not. -- If a man will begin with certainties, he shall end with doubts, but if he will be content to begin with doubts he shall end in certainties. Francis Bacon
Reply by ●September 29, 20212021-09-29
On Wed, 29 Sep 2021 12:33:12 -0700, Robert Baer <robertbaer@localnet.com> wrote:>John Larkin wrote: >> On Tue, 28 Sep 2021 15:21:42 -0700, John Robertson <spam@flippers.com> >> wrote: >> >>> >>> On 2021/09/28 1:51 p.m., John Larkin wrote: >>>> On Tue, 28 Sep 2021 16:32:54 -0400, bitrex <user@example.net> wrote: >>>> >>>>> On 9/28/2021 3:30 PM, John Larkin wrote: >>>>>> On Tue, 28 Sep 2021 11:04:15 -0700, John Robertson <spam@flippers.com> >>>>>> wrote: >>>>>> >>>>>>> On 2021/09/28 9:18 a.m., jlarkin@highlandsniptechnology.com wrote: >>>>>>>> Everything that conducts is a lossy transmission line. >>>>>>>> >>>>>>>> A solenoid inductor. >>>>>>>> >>>>>>>> https://www.dropbox.com/s/b5eae1jwsdscw4k/PC_3.jpg?raw=1 >>>>>>>> >>>>>>> ... >>>>>>>> >>>>>>>> >>>>>>> >>>>>>> Do you mind showing your test setup to get that trace? You must have a >>>>>>> back-emf diode on the coil, but that diminishing slope looks wrong... >>>>>> >>>>>> >>>>>> The setup is in the picture. The inductor goes between an SMA >>>>>> connector and ground. The scope trace is 50 ohm TDR. >>>>>> >>>>>> Closeup: >>>>>> >>>>>> https://www.dropbox.com/s/6kzbwo87olh8am3/PC_1.jpg?raw=1 >>>>>> >>>>>> Given a voltage step from a 50 ohm source, one would expect an >>>>>> inductor to have a spike of the applied step voltage, and an >>>>>> exponential decay towards ground with time constant L/50. What's cool >>>>>> is the initial flat, with the winding acting like a transmission line >>>>>> roughly 800 ps round-trip. >>>>>> >>>>>> I think. >>>>>> >>>>> >>>>> If I remember correctly at one time before it was known whether fiber >>>>> optics would be feasible, the telcos were going to use helix microwave >>>>> wave-guides for "broadband" data transmission >>>> >>>> There were trials done using light, in a pipe guided by thermal >>>> gradients. >>>> >>>> I remember when hills had giant sugar-scoop microwave antennas. Now >>>> they have cell towers. If we get gen5 or 6 cellular, all that will be >>>> gone. >>>> >>> >>> We still have scoops on our telco (Telus) building here in Vancouver at >>> Boundary and Kingsway. There is an obvious missing connection to the >>> building from the bottom of each scoop: >>> >>> https://goo.gl/maps/cYVDeKiqzPu13zGu5 >>> >>> John :-#)# >> >> Some guys at Bell Labs discovered the universe's background radiation >> with a big scoop antenna. The initial noise figure was unaccountably >> high until they evicted some pigeons from inside. >> > Any time of flight measurements?Resistors in gates can reduce birdies. -- If a man will begin with certainties, he shall end with doubts, but if he will be content to begin with doubts he shall end in certainties. Francis Bacon
Reply by ●September 29, 20212021-09-29
Robert Baer wrote:> bitrex wrote: >> On 9/28/2021 12:26 PM, jlarkin@highlandsniptechnology.com wrote: >>> On Tue, 28 Sep 2021 12:22:54 -0400, bitrex <user@example.net> wrote: >>> >>>> On 9/28/2021 12:18 PM, jlarkin@highlandsniptechnology.com wrote: >>>>> Everything that conducts is a lossy transmission line. >>>>> >>>>> A solenoid inductor. >>>>> >>>>> https://www.dropbox.com/s/b5eae1jwsdscw4k/PC_3.jpg?raw=1 >>>>> >>>>> A series string of surface-mount resistors. >>>>> >>>>> A ground plane or power pour. >>>>> >>>>> A wound-foil capacitor. >>>>> >>>>> A wirewound resistor. >>>>> >>>>> A piece of wire in free air. >>>>> >>>>> A via. >>>>> >>>>> A pcb trace, of course. >>>>> >>>>> >>>>> >>>> >>>> What if ur brain is a lossy transmission line >>> >>> What if you posted something intelligent about electronic design? >>> >>> >> >> The brain conducts! I know an elderly person who had ECT for psychosis >> one time, it was miraculous. >> > Was that outlawed by the 1800s as being destructive, and inhumane? > Besides, "results" were all over the map. > Might work in your case... >ECT is still used. A friend of mine was helped considerably by it, just 7 years or so ago. Back then she said that it more or less cured her crippling anxiety, unfortunately at the price of some memory loss. Cheers Phil Hobbs
Reply by ●September 29, 20212021-09-29
On 29/09/21 20:20, Robert Baer wrote:> bitrex wrote: >> On 9/28/2021 12:26 PM, jlarkin@highlandsniptechnology.com wrote: >>> On Tue, 28 Sep 2021 12:22:54 -0400, bitrex <user@example.net> wrote: >>> >>>> On 9/28/2021 12:18 PM, jlarkin@highlandsniptechnology.com wrote: >>>>> Everything that conducts is a lossy transmission line. >>>>> >>>>> A solenoid inductor. >>>>> >>>>> https://www.dropbox.com/s/b5eae1jwsdscw4k/PC_3.jpg?raw=1 >>>>> >>>>> A series string of surface-mount resistors. >>>>> >>>>> A ground plane or power pour. >>>>> >>>>> A wound-foil capacitor. >>>>> >>>>> A wirewound resistor. >>>>> >>>>> A piece of wire in free air. >>>>> >>>>> A via. >>>>> >>>>> A pcb trace, of course. >>>>> >>>>> >>>>> >>>> >>>> What if ur brain is a lossy transmission line >>> >>> What if you posted something intelligent about electronic design? >>> >>> >> >> The brain conducts! I know an elderly person who had ECT for psychosis one >> time, it was miraculous. >> > Was that outlawed by the 1800s as being destructive, and inhumane? > Besides, "results" were all over the map. > Might work in your case...One of my relative was significantly helped by ECT, to the extent that she requested it over the years. When ECT became unfashionable, she had to request it more forcibly. It did seem to help her more than the drugs.
Reply by ●September 30, 20212021-09-30
The post below is another example of Bozo acting incoherent. The phrase "evicting some pigeons" obviously means getting rid of pigeon droppings, the droppings rather go with the pigeons! "the concepts "male" and "female" are essentially social constructions" (Bill Sloman) -- Anthony William Sloman <bill.sloman@ieee.org> wrote:> X-Received: by 2002:a05:620a:2544:: with SMTP id s4mr3121720qko.219.1632879054009; Tue, 28 Sep 2021 18:30:54 -0700 (PDT) > X-Received: by 2002:a25:5885:: with SMTP id m127mr9411773ybb.415.1632879053718; Tue, 28 Sep 2021 18:30:53 -0700 (PDT) > Path: eternal-september.org!reader02.eternal-september.org!news.misty.com!border2.nntp.dca1.giganews.com!nntp.giganews.com!news-out.google.com!nntp.google.com!postnews.google.com!google-groups.googlegroups.com!not-for-mail > Newsgroups: sci.electronics.design > Date: Tue, 28 Sep 2021 18:30:53 -0700 (PDT) > In-Reply-To: <4c77lg9foa3t5dhtp5cf961s3u5rvk6m12@4ax.com> > Injection-Info: google-groups.googlegroups.com; posting-host=14.202.161.14; posting-account=SJ46pgoAAABuUDuHc5uDiXN30ATE-zi- > NNTP-Posting-Host: 14.202.161.14 > References: <ocf6lgh9g622olqlq5k0mc20os0ktqcvcl@4ax.com> <DKmdnZxUWsGCxM78nZ2dnUU7-RednZ2d@giganews.com> <tgq6lgtmphtatfh2svc7g2b6stj0kckp7e@4ax.com> <WZK4J.85540$Dr.53149@fx40.iad> <6qv6lgp28p1ivhvjd82qcmlscs6i4tddqr@4ax.com> <7-CdnSRJw7_kCM78nZ2dnUU7-IfNnZ2d@giganews.com> <4c77lg9foa3t5dhtp5cf961s3u5rvk6m12@4ax.com> > User-Agent: G2/1.0 > MIME-Version: 1.0 > Message-ID: <baebec81-3b9b-4fa4-ab74-b807e6378f94n@googlegroups.com> > Subject: Re: txlines > From: Anthony William Sloman <bill.sloman@ieee.org> > Injection-Date: Wed, 29 Sep 2021 01:30:54 +0000 > Content-Type: text/plain; charset="UTF-8" > Lines: 15 > Xref: reader02.eternal-september.org sci.electronics.design:646738 > > On Wednesday, September 29, 2021 at 8:58:26 AM UTC+10, John Larkin wrote: >> On Tue, 28 Sep 2021 15:21:42 -0700, John Robertson <sp...@flippers.com> wrote: >> >On 2021/09/28 1:51 p.m., John Larkin wrote: >> >> On Tue, 28 Sep 2021 16:32:54 -0400, bitrex <us...@example.net> wrote: >> >>> On 9/28/2021 3:30 PM, John Larkin wrote: >> >>>> On Tue, 28 Sep 2021 11:04:15 -0700, John Robertson <sp...@flippers.com> wrote: >> >>>>> On 2021/09/28 9:18 a.m., jla...@highlandsniptechnology.com wrote: > >> Some guys at Bell Labs discovered the universe's background radiation >> with a big scoop antenna. The initial noise figure was unaccountably >> high until they evicted some pigeons from inside. > > It wasn't so much the pigeons as their droppings. Rather like some of the posters here. > > -- > Bill Sloman, Sydney > >
Reply by ●September 30, 20212021-09-30
On 9/29/2021 6:09 PM, Phil Hobbs wrote:> Robert Baer wrote: >> bitrex wrote: >>> On 9/28/2021 12:26 PM, jlarkin@highlandsniptechnology.com wrote: >>>> On Tue, 28 Sep 2021 12:22:54 -0400, bitrex <user@example.net> wrote: >>>> >>>>> On 9/28/2021 12:18 PM, jlarkin@highlandsniptechnology.com wrote: >>>>>> Everything that conducts is a lossy transmission line. >>>>>> >>>>>> A solenoid inductor. >>>>>> >>>>>> https://www.dropbox.com/s/b5eae1jwsdscw4k/PC_3.jpg?raw=1 >>>>>> >>>>>> A series string of surface-mount resistors. >>>>>> >>>>>> A ground plane or power pour. >>>>>> >>>>>> A wound-foil capacitor. >>>>>> >>>>>> A wirewound resistor. >>>>>> >>>>>> A piece of wire in free air. >>>>>> >>>>>> A via. >>>>>> >>>>>> A pcb trace, of course. >>>>>> >>>>>> >>>>>> >>>>> >>>>> What if ur brain is a lossy transmission line >>>> >>>> What if you posted something intelligent about electronic design? >>>> >>>> >>> >>> The brain conducts! I know an elderly person who had ECT for >>> psychosis one time, it was miraculous. >>> >> Was that outlawed by the 1800s as being destructive, and inhumane? >> Besides, "results" were all over the map. >> Might work in your case... >> > > ECT is still used. A friend of mine was helped considerably by it, just > 7 years or so ago. Back then she said that it more or less cured her > crippling anxiety, unfortunately at the price of some memory loss. > > Cheers > > Phil HobbsIt's often portrayed as a scary or barbaric treatment in TV and film but in a modern medical setting it's not really like that at all. I don't think it's known conclusively why it works, when it does. There seem to be a number of competing theories none of which seem immediately more plausible than another. I expect there's not a lot of money on offer to research the topic very thoroughly as vs. medications there's not a large commercial motivation, I'd guess there's only a couple of companies in the US that manufacture the equipment.
