Re: BITX40 and Data FT8/JT65 et al.
Yes it is the volume pot. The H is the high side (input) to the pot.
Thanks Zvika, what is PotH ?? Is that a potentiometer labeled "H" ?? Volume control pot ?? I could not find that on the version 40 schematic. I have version 6.
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Re: Best wishes to our friends in India
Dear friend? Pl delete? my email add from group this is my office? email. So many email incoming? . So my account? is chock.? I hope u understand? . Tks? Shiv Kumar? from Ludhiana? IGP? ?rang office? Ludhiana
To be fair, china did offer?help. we declined. I am ambivalent about this reaction of india. it could have lead to softer stances between the two countries. they have moved into 1000 sq km of key areas of india in the last two years.? Let's drop this political discussion from this group, if everyone is okay with it.? - f
Roger, China and India have been inches away from nuclear war for decades.? ?I would hope that China would take the high roar with COVID relief for India.
I also wish we had responded sooner, but this India COVID surge was so sudden, I don¡¯t think any nation could have done anything faster than what we¡¯re doing now.
That said, I am deeply disappointed that our FDA threw so many hurdles in front of Ashhar and colleagues after they¡¯d developed a cheap an functional ventilator.
For mostly political reasons. The ventilators were for offshore use so the FDA should have gone hands-off, ¡°use at your own risk.¡±
I rather enjoyed another poster¡¯s speculation about how many more people died than were saved by FDA meddling.?
And I personally know a one-time Libertarian Presidential candidate who has a whole lot more to say about this issue...? but this isn¡¯t the place.? If you want to know, ask off-list.
73
Jim N6OTQ
Sent from my quenched-gap spark transmitter.
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Re: Best wishes to our friends in India
To be fair, china did offer?help. we declined. I am ambivalent about this reaction of india. it could have lead to softer stances between the two countries. they have moved into 1000 sq km of key areas of india in the last two years.? Let's drop this political discussion from this group, if everyone is okay with it.? - f
Roger, China and India have been inches away from nuclear war for decades.? ?I would hope that China would take the high roar with COVID relief for India.
I also wish we had responded sooner, but this India COVID surge was so sudden, I don¡¯t think any nation could have done anything faster than what we¡¯re doing now.
That said, I am deeply disappointed that our FDA threw so many hurdles in front of Ashhar and colleagues after they¡¯d developed a cheap an functional ventilator.
For mostly political reasons. The ventilators were for offshore use so the FDA should have gone hands-off, ¡°use at your own risk.¡±
I rather enjoyed another poster¡¯s speculation about how many more people died than were saved by FDA meddling.?
And I personally know a one-time Libertarian Presidential candidate who has a whole lot more to say about this issue...? but this isn¡¯t the place.? If you want to know, ask off-list.
73
Jim N6OTQ
Sent from my quenched-gap spark transmitter.
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Re: Best wishes to our friends in India
Amazing.? ?You prompted me to go look at some other videos.? ?I just finished putting "zeobrite" in my pool filter (150 pounds of it).? ? Amazing that this can be done.? Thank you for posting this.
Gordon
On Wed, Apr 28, 2021 at 1:09 PM < quad@...> wrote: Interesting , Krishna, an avid DIYer from Hyderabad fabricated an Oxygen concentrator - see here?
On Wed, Apr 28, 2021 at 12:13 PM, Raj vu2zap wrote:
Hi Arv and Gang,
Need of the hour is Oxygen concentrators..
1. Compress air to 2 bar
2. Force through Zeolite to strip nitrogen
3. store in tank
4. force low pressure air over zeolite to flush nitrogen
5. repeat
2.1 send stored enriched air into second stage..
2.2 and so on as above
A little more complex than a ventilator maybe..
The above is my general knowledge on the subject and may not be accurate.
Raj
At 28/04/2021, you wrote:
Thanks Gordon.? That clarifies a lot.? Next question: Are cheap ventilators
still needed...in the US, in India, or elsewhere?
What is the next step...if any?
Arv
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Re: Homemade Circuit Boards
Thanks Mark,
The home made clorox wipes are only for the car and the doorknobs and handles on the house doors. I have 'hand sanitizer' spray in both the car and the kitchen as well as convenient foaming hand soap at every sink in the house. All of it is non-spill. I think I already have the peroxide here. Meanwhile I have a pile of the prototype boards with the plated through holes to make modules for accessories and sections of complete radios. I will still want to etch some. Last time I etched boards I used the Ferric chloride. That stuff is ugly. It has been a while.
73,
Bill KU8H
bark less - wag more
toggle quoted message
Show quoted text
On 4/28/21 7:40 PM, Mark - N7EKU wrote: And then there are tubes,
Where electrons do indeed have to travel some distance all on their own!
In transistors, I thought it was the holes that did the traveling heh heh.
Boy Bill, if I was re-tested on all my high school classes I think I would fair poorly!?? For COVID we just keep a small cloth in a heavy duty zip lock wet with rubbing alcohol.? We can carry that in our pockets anywhere and it works well (and a leak won't bleach anything!)
Have fun if you try the peroxide method.? Just remember "add acid to water" or in this case you slowly add the HCL to the H2O2. Putting water into concentrated acid can make the water boil and spit out, taking acid with it and splattering it around.? I'm not sure the hardware store HCl is that strong, but it's better safe than sorry.? The mixed solution is not bad to handle.? If you get it on your hands, just rinse it off.? Not anything like battery acid or lye.
73
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Re: Homemade Circuit Boards
And then there are tubes,
Where electrons do indeed have to travel some distance all on their own!
In transistors, I thought it was the holes that did the traveling heh heh.
Boy Bill, if I was re-tested on all my high school classes I think I would fair poorly!?? For COVID we just keep a small cloth in a heavy duty zip lock wet with rubbing alcohol.? We can carry that in our pockets anywhere and it works well (and a leak won't bleach anything!)
Have fun if you try the peroxide method.? Just remember "add acid to water" or in this case you slowly add the HCL to the H2O2.? Putting water into concentrated acid can make the water boil and spit out, taking acid with it and splattering it around.? I'm not sure the hardware store HCl is that strong, but it's better safe than sorry.? The mixed solution is not bad to handle.? If you get it on your hands, just rinse it off.? Not anything like battery acid or lye.
73
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Re: Video of Talk: Does price buy Performance or Satisfaction in an HF Transceiver? by Frank Howell K4FMH
Bob,
Thank you ever so much for your comment, it is very much appreciated. I'm delighted you enjoyed it.
73
Trystan G0KAY
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Re: Homemade Circuit Boards
If somebody wants to figure out how long it takes a marble to go through their uBitx,
here's a good starting point:? ?
That path through the uBitx is mostly copper.
The example says that for a 1 Amp current flowing through a copper wire of 2mm diameter,
the individual electrons are travelling at around 23um/sec.
So takes 1e6/23 = 43478 seconds (about 12 hours) for one electron to move one meter down the 2mm diameter copper wire.
Electron speed will be proportional to current flow, and inversely proportional to the cross sectional area of the wire.
With a 1ma current, would take a year through that same 2mm diameter 1 meter long wire.
With a 1ma current through a 20mm diameter wire that is 1 meter long, it would take 100 years.
Jerry, KE7ER
toggle quoted message
Show quoted text
On Wed, Apr 28, 2021 at 02:55 PM, Tom, wb6b wrote:
On Wed, Apr 28, 2021 at 02:38 PM, Jerry Gaffke wrote:
If that pipe is very very very very long, it might take years for any of our new marbles to fall out the far end.
When I was first learning about semiconductors, the idea of how long it could take for a particular electron to enter a diode or transistor and "fall out" the other side was an amazing thing to learn.?
There must be an amazing amount of potential energy in those small components if large currents can flow and the electrons that flow out are electrons that have still been in there for a long time (years?).?
The physics in the group may be able to shine a more accurate light upon this. Hopefully they don't blow all this amazement and wonder up into some more mundane reality.
Tom, wb6b
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Re: Homemade Circuit Boards
On Wed, Apr 28, 2021 at 02:38 PM, Jerry Gaffke wrote:
If that pipe is very very very very long, it might take years for any of our new marbles to fall out the far end.
When I was first learning about semiconductors, the idea of how long it could take for a particular electron to enter a diode or transistor and "fall out" the other side was an amazing thing to learn.? There must be an amazing amount of potential energy in those small components if large currents can flow and the electrons that flow out are electrons that have still been in there for a long time (years?).? The physics in the group may be able to shine a more accurate light upon this. Hopefully they don't blow all this amazement and wonder up into some more mundane reality. Tom, wb6b
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Re: Homemade Circuit Boards
Lots of stuff I knew when I was 13 years old that has now been forgotten.
Thankfully.
Charge is simply a count of a surplus (or deficit) of electrons.
One Coulomb of charge is?6,240,000,000,000,000,000?electrons.
Think of a wire as a long pipe full of marbles.
Push in 6,240,000,000,000,000,000 marbles on one end and?6,240,000,000,000,000,000 fall out the other end,
We might say that's one Coulomb of marbles.
If that pipe is very very very very long, it might take years for any of our new marbles to fall out the far end.
Push in 6,240,000,000,000,000,000 marbles each second, and we might say you have a marble flow of 1 Amp.
Try it!
Jerry, KE7ER
On Wed, Apr 28, 2021 at 01:14 PM, John Cunliffe W7ZQ wrote:
<He said that electrons do NOT zoom around in wires at the speed of light. In fact, they move very slowly. What moves around our wires at the speed of light is "charge".
Charge is ( I think ) the status of an electron existing at a higher energy level.<
Strange that this is not common knowledge, we learned that in 5th grade physics in 1962
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Re: Video of Talk: Does price buy Performance or Satisfaction in an HF Transceiver? by Frank Howell K4FMH
Watched on Youtube, a really excellent presentation, thank you Trystan for posting.
73,
Bob GM4CID
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Re: Homemade Circuit Boards
<He said that electrons do NOT zoom around in wires at the speed of light. In fact, they move very slowly. What moves around our wires at the speed of light is "charge".
Charge is ( I think ) the status of an electron existing at a higher energy level.<
Strange that this is not common knowledge, we learned that in 5th grade physics in 1962
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Re: Best wishes to our friends in India
Interesting , Krishna, an avid DIYer from Hyderabad fabricated an Oxygen concentrator - see here?
https://www.hifivision.com/threads/diy-oxygen-concentrator.80805/
toggle quoted message
Show quoted text
On Wed, Apr 28, 2021 at 12:13 PM, Raj vu2zap wrote:
Hi Arv and Gang,
Need of the hour is Oxygen concentrators..
1. Compress air to 2 bar
2. Force through Zeolite to strip nitrogen
3. store in tank
4. force low pressure air over zeolite to flush nitrogen
5. repeat
2.1 send stored enriched air into second stage..
2.2 and so on as above
A little more complex than a ventilator maybe..
The above is my general knowledge on the subject and may not be accurate.
Raj
At 28/04/2021, you wrote:
Thanks Gordon.? That clarifies a lot.? Next question: Are cheap ventilators
still needed...in the US, in India, or elsewhere?
What is the next step...if any?
Arv
|
Re: BITX40 and Data FT8/JT65 et al.
Thanks Zvika, what is PotH ?? Is that a potentiometer labeled "H" ?? Volume control pot ?? I could not find that on the version 40 schematic. I have version 6.
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Re: Homemade Circuit Boards
On 2021-04-28 08:33, Bill Cromwell wrote: Do you suppose that teacher could have been wrong? It's possible. I recently read a post on Quora that was a real eye-opener. This guy said he was a physicist, and that many people had a misconception about electricity. Here it is: "Current" is flow of electrons. Electrons flow around our circuits at the speed of light. He said that electrons do NOT zoom around in wires at the speed of light. In fact, they move very slowly. What moves around our wires at the speed of light is "charge". Charge is ( I think ) the status of an electron existing at a higher energy level. This electron bangs in to the electron next door and transfers its higher energy level to it. Then that electron bangs in to the next electron etc. It's rather like that desk toy with a row of suspended ball bearings. You swing the end one, it bangs into the next one and ultimately the one at the other end swings - without the ones in the middle moving much. It's called a "Newton's Cradle". - Jerry KF6VB
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Re: Homemade Circuit Boards
Hi,
I did read the Clorox label and it does not say anything about HCL. Around about 60 years ago a school teacher (biology) told us the laundry bleach was made around hydrochloric acid during the lessons about our stomach and the acid found there. It was on the test. In those days I aced all tests and classes. Over time that morphed from laundry bleach to Clorox. I will take my magnifying glass and my brand new bifocals to the store and read the labels on the various brands of 'laundry bleach'. At least ubtil that super fine print gives me? headache. Do you suppose that teacher could have been wrong?
Over the years I have used a solution of Clorox and water to disinfect food prep surfaces that I suspected of more serious contamination than vinegar would kill. In fact, I have used it to disinfect 'touch' surfaces on my car with home made wipes made with spent dryer sheets and a soluton of Clorox and water. Covid you know. It is nasty stuff whatever is in it and I wouldn't (never did) mix it with other things (besides water). That could be suicidal. The biology teacher told us that too.
Back to the real subject at hand. I am going to use the peroxide mix. I was going to try that several years ago and was sidetracked by life. Most of us know how that happens. Thanks for the reminder about that.
73,
Bill KU8H
bark less - wag more
toggle quoted message
Show quoted text
On 4/28/21 12:14 AM, Mark - N7EKU wrote: OMG!
Don't mix things with bleach!
Bleach is not an acid but a strong base, containing 3-8% sodium hypochlorite.? Do not mix it with any acid, or pretty much any household chemical!? Bleach can then generate toxic Chlorine gas. Toxic because the gas combines easily with water/moisture (like inside your lungs) to make hydrochloric acid.? This was actually used as a chemical weapon in WWI.? We want to etch circuit boards, not our lungs!
Stay safe.
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Re: BITX40 and Data FT8/JT65 et al.
Yes.? ? They are working fine together.
I did added DC block capacitors and serial resistor of 10K to reduce the load.
--
Zvika?
4Z1ZV
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Re: Best wishes to our friends in India
On Tue, Apr 27, 2021 at 11:43 PM, Raj vu2zap wrote:
Need of the hour is Oxygen concentrators..
Doug supplied this interesting link. Tom, wb6b
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Video of Talk: Does price buy Performance or Satisfaction in an HF Transceiver? by Frank Howell K4FMH
Hi folks, The following talk is now available on YouTube:?
Does price buy Performance or Satisfaction in an HF Transceiver?
Frank Howell?K4FMH?presents a fascinating insight into our modern HF rigs looking at their price, their performance as measured by Rob Sherwood and reviews on eham.net.
Do you get what you pay for? Are expensive transceivers really worth it? Join us on this presentation to find out.
There is also a special guest appearance by Rob Sherwood himself in the Q&A section of the video - which was an unexpected bonus.? Have fun, Trystan G0KAY
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Some interristing web sites for Ubitx
To see for 3D lovers and also for a bit of technique and theory
It may be known?
puts them in case
cdt
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Kobus ZS6CHK
Trystan G0KAY
Zvi Segal
Gerard