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Re: Antuino manual
¿ªÔÆÌåÓýOK, I'll check that. ?The series 1N4148 on the battery line could also be open. I found the schematic. ?Had trouble downloading from github but finally got it. ?Thanks, Jim On Aug 22, 2019, at 9:22 PM, Ashhar Farhan <farhanbox@...> wrote:
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Re: Antuino manual
Jim, The SMD parts are assembled on a Panasonic pick and place. No chance of a reversed diode. What is, however, possible is that the DC connector, which is hand soldered, hasnt been soldered properly. Open up the box, unscrew the PCB and flow solder on the tabs of the DC connector from the component side. I covered this problem a while ago.? A video manual is in the works. I finished a few yesterday, I will start posting th3 videos over the weekend. 73, f On Fri 23 Aug, 2019, 6:17 AM Jim Sheldon, <w0eb@...> wrote:
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Re: Antuino manual
From my post 71040:
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There's an updated schematic in this July 26 2019 post from Farhan along with a list of changes:????/g/BITX20/message/70551 As he states in that post, it all got archived here: ???? The previous version of the Raduino is found here, last updated in May of 2019: ? ?? Here's the manual:?? If the Bitx40 and uBitx are any indication,? there won't be a better manual coming out until you write it. Jerry, KE7ER On Thu, Aug 22, 2019 at 05:47 PM, Jim Sheldon wrote:
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Re: Antuino manual
¿ªÔÆÌåÓýThat would be nice. ?Mine works fine on the external power input but 6 brand new AA cells in the battery box (9.56V) wont even light it up. ?I did check and have the 9+ volts on the PCB terminals but without a manual and current schematic I don't want to take it apart. ?Not really a happy camper right now. ?Farhan take note I suspect an open ?or reversed diode but without a schematic I can trust, I don't want to destroy it accidentally. Jim, W0EB? ? On Aug 22, 2019, at 6:43 PM, John Norris <jlnorrisjr@...> wrote:
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Re: Bitx40 very loud, high-pitched, low frequency noise
Thank you so much for your help Woody! I'll try to get my hand on a small ceramic cap and let you know if this resolved the problem. I'll also try to salvage the ferrite sleeve from an old cable. I'll also try to power the bitx using 8 AA batteries as a constant DC source to check if the problem is even related to the power supply. Hopefully 8 AA batteries will allow for at least a couple of minutes of RX operation.
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Re: Isolate any jacks/controls from metal chassis?
#ubitx
Used sticky back copper foil to line the plastic case on my SDRPlay. Worked well. Cleaned up some noise issues.
Jim WA3APC |
Moderated
Re: QST September 2019 pg42 to 47
CAREFUL! On Thu, Aug 22, 2019, 2:36 PM Dr. Flywheel <Dr.Flywheel@...> wrote:
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Original firmware upload OK, CEC not so much - what am I doing wrong?
Kim Cary
On my no-mods-yet v5 ?BitX when I upload the?UBITXV5_CEC_V1.200_16P.hex I get 16 block symbols in the LCD upper row and no function or encoder response. When I upload?ubitx_20._org.hex I get a functioning radio but I'm back to where I started.
What am I doing wrong? How can I troubleshoot this? |
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Re: QST September 2019 pg42 to 47
I took a course from the Mises Institute once on intellectual property. It wasn't until I was IN the class that I found out the professor was an IP contrarian. He didn't agree with copyright and intellectual property laws. I put up with his oh so libertarian claptrap for a couple of weeks, then told him I was dropping the course, because his opinion was that I didn't deserve anything for the effort I put into my own writing and artwork for my comic book and webcomic series.
People who go to THOSE lengths to justify stealing my work then trying to educate me as to why it wasn't really stealing are toads, and I told him so. Gwen, NG3P |
Re: Bitx40 very loud, high-pitched, low frequency noise
Woody
¿ªÔÆÌåÓýOne more thing.... A ferrite sleeve is useful for common mode RFI a higher frequencies, but has little effect on lower frequencies, like audio.? It provides a series inductance in the supply line, so more that one turn of a supply cable through the sleeve (if will fit) will be more effective than just one pass through. Woody --
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Re: Bitx40 Fuses
Woody
¿ªÔÆÌåÓýOn 8/22/2019 21:38, Donald wrote:
Jerry Gaffke, in post #44333, suggested using a 1/2A fuse for the main board, and using 2A or 3 A for the PA. Perhaps a little over-kill, but... That would provide the ultimate protection for the board, mostly by avoiding burning of circuit board traces in the event of a short.? As they say, silicon is faster to blow than a fuse ;)?? Reverse polarity power can kill semiconductors, then (if they go shorted) blow the fuse.? That is why a shunt power diode is useful in addition to a only fuse - to blow the fuse before the reverse polarity voltage reaches critical devices.? A series diode will stop the reverse voltage without blowing the fuse but will add about a 0.6 volt drop to the equipment. Woody --
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Re: QST September 2019 pg42 to 47
There is a racket going on with college textbooks.
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These days you can wind up spending $300 on a required book for a class. And there's various schemes to discourage a used market, kickbacks to encourage the powers that be to choose specific textbooks, etc Costs can be way more than $1k/yr. Not true everywhere.? Some schools make a policy of of using freely available material where possible. And even make it possible to get credit by "attending" class online. Worth considering when shopping for a University. Generally speaking, I find it best to keep my nose clean with respect to obeying the law. If you feel a law is wrong enough that it needs breaking, then go for it. That can at times be an important civic duty. But don't be surprised if there are consequences. Regarding the ARRL and their grip on those copyrights, that's their privilege. They seem enough of a force for mostly good that it is worth putting up with (YMMV). Though if I spent 6 months on a project that I wanted made easily available to amateurs worldwide, publishing in QST or QEX would not be my first choice. Jerry, KE7ER On Thu, Aug 22, 2019 at 02:05 PM, Ken Hansen wrote:
So textbooks cost $1K/year, tuition is $20K, and it's the TEXTBOOKS that are the problem? |
Re: Bitx40 very loud, high-pitched, low frequency noise
Woody
¿ªÔÆÌåÓýOn 8/22/2019 20:15, SP9DEV wrote:
Piotr, Lower value capacitors cannot hurt, but they are only useful for Very High Frequencies.? The type of capacitor (electrolytic,? ceramic, silver mica, etc.)? have different characteristics at different frequencies. ? For example, tantalum electrolytic capacitors are typically useful at higher frequencies than aluminum electrolytic capacitors due to the lower ESR at high frequencies.? Lower capacitance ceramic or silver mica capacitors typically have lower ESR at high frequencies than do electrolytic ones. ? For the very lowest ESR, "chip" (SMD) capacitors perform best.? This is because the lead wires on other capacitors add inductance in series with the capacitor, thus increasing the ESR.? In your case. it is doubtful that going below .01 uf will be helpful. A physically small ceramic capacitor of .1 or .01 uf should be low enough to bypass anything less than VHF frequencies or very fast transient spikes.?? Here is a reactance calculator that will give the effective series resistance (ESR) of a capacitor.? This is for an ideal capacitor and does not take into account lead length and the type (construction) of the part. If you have any old computer cables, power supply cables, or similar that have a molded lump in the line, that is a ferrite sleeve.? Many times I have cut away the? molded plastic, pulled out the wire, and used them in my circuits. ? Good luck! Woody - KZ4AK Google translate (maybe): Kondensatory o ni?szej warto?ci nie mog? zaszkodzi?, ale s? przydatne tylko w przypadku bardzo wysokich cz?stotliwo?ci. Rodzaj kondensatora (elektrolityczny, ceramiczny, mika srebrna itp.) Ma r¨®?ne w?a?ciwo?ci przy r¨®?nych cz?stotliwo?ciach. Na przyk?ad kondensatory elektrolityczne tantalu s? zwykle u?yteczne przy wy?szych cz?stotliwo?ciach ni? aluminiowe kondensatory elektrolityczne ze wzgl?du na ni?szy ESR przy wysokich cz?stotliwo?ciach. Kondensatory ceramiczne lub srebrowe miki o ni?szej pojemno?ci zwykle maj? ni?sz? ESR przy wysokich cz?stotliwo?ciach ni? elektrolityczne. W przypadku najni?szej ESR kondensatory ?chipowe¡± (SMD) dzia?aj? najlepiej. Jest tak, poniewa? przewody o?owiane w innych kondensatorach dodaj? indukcyjno?? szeregowo do kondensatora, zwi?kszaj?c w ten spos¨®b ESR. W Twoim przypadku. w?tpliwe jest, aby p¨®j?? poni?ej .01 uf b?dzie pomocne. Fizycznie ma?y ceramiczny kondensator .1 lub .01 uf powinien by? wystarczaj?co niski, aby omin?? cokolwiek mniejszego ni? cz?stotliwo?ci VHF lub bardzo szybkie przej?ciowe impulsy. Oto kalkulator reaktancji, kt¨®ry da efektywn? rezystancj? szeregow? (ESR) kondensatora. Dotyczy to idealnego kondensatora i nie uwzgl?dnia d?ugo?ci o?owiu oraz rodzaju (budowy) cz??ci. Je?li masz jakie? stare kable komputerowe, kable zasilaj?ce lub podobne, kt¨®re maj? uformowany guzek w linii, jest to tuleja ferrytowa. Wiele razy odci??em uformowany plastik, wyci?gn??em drut i u?y?em ich w moich obwodach. --
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Re: Isolate any jacks/controls from metal chassis?
#ubitx
On Thu, Aug 22, 2019 at 09:54 AM, <jhowell39@...> wrote:
Electric guitar body cavities (pickup mounts, etc) often use a conductive copper tape for shieldingI bought a roll on Amazon some time back. The copper tape is handy. One thing to note is: The tape claimed to have conductive adhesive. There was absolutely nothing conductive at all about the adhesive.? I cut a hole in a piece of paper and stuck two pieces of the tape together so they only make contact through the 1/2 inch hole in the paper and I could not measure any resistance less than an open circuit. If I stuck two pieces of copper tape together where they overlap (the edge of one going down the center of the other) then I measured a low resistance connection between them. I believe in the case of the overlap, the rough edge of the copper tape where I cut it was making contact with the top of the copper foil I stuck it to. I still like the tape, I just make sure I add some solder bridges across the overlapped layers. Even if the adhesive was conductive, probably not a good idea to rely on it for a solid electrical connection. I've found this tape handy for adding big ground areas to prototype board projects, too. Tom, wb6b |
Moderated
Re: QST September 2019 pg42 to 47
¿ªÔÆÌåÓýSo textbooks cost $1K/year, tuition is $20K, and it's the TEXTBOOKS that are the problem?Bullshit. If textbooks were free, a year at university would decrease by 5%, or about the amount the average non-athlete student pays in sports-related fees on many colleges. Want to lower textbook expenses? Tell professors to stop changing textbooks each year, let an ecosystem of used books develop around the campus. When I was in college (1985) I had a calculus book by a man named Anton, he 'revised' his textbook every couple years, rendering previous used editions worthless. Are there really sufficient advances in the field of Calculus 1 to justify rewriting the book every couple years? But this is curriculum-wide - why do Norton Anthologies if Early American Lit get revises every few years? The underlying body of literature is static - all the authors met their fate over a century ago, yet the textbooks keep being revised... etc. Ken, N2VIP On Aug 22, 2019, at 3:36 PM, Dr. Flywheel <Dr.Flywheel@...> wrote:
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Re: QST September 2019 pg42 to 47
Jack Purdum
It's a perfectly apropos response to a statement that is without foundation or fact, which is exactly what your statement was. I highlighted the BS part. What you wrote below doesn't change the BS you offered in the first note. One wonders how you know most torrent traffic is on porn sites, but that's another question and doesn't lessen the revenue lost on books. Can you supply the place where you found the statement: "eBook tagged data traffic is almost not measurable in the grand scheme of things." or is that just more BS? To the individual, losing the royalties on 20,000 books might mean the difference between writing another book or not. While that may be small "in the grand scheme of things", it is not small to the individual. "Now it is a competition between your high-value books (that apparently
are not going to be published, due to lack of profitability) and what
people are actually consuming en mass 24/7/365." Actually, had you read carefully, you would have noticed that I said that I would have stopped writing at the turn of the century if I was only motivated by profit. Actually, I written six books since 2000 and have another one coming out next year. The loss is not what I won't write, it's what all of the other very talented writers don't write because it's no longer worth the effort. Some of them write as a primary income source and they simply cannot exist with torrent sites, so they do something else. That's the real cost. Jack, W8TEE
On Thursday, August 22, 2019, 4:36:47 PM EDT, Dr. Flywheel <Dr.Flywheel@...> wrote:
Jack, I just love educated responses that use Bullshit as an argument. What could be more reliable? Cost of Books - See:? If, for example, you are majoring in architecture or engineering, you may need computer programs that an English or Education major won¡¯t need. The national average for this category in 2017 was $1,100, but the cost of books is soaring every year so count on it going up from 8%-10% from year-to-year. See FRB report:?? As much as you like to flatter yourself about the high loss rate of books "stolen" via file sharing services (torrent is one type), this type of traffic is almost negligible. Most torrent type traffic is PORN content. Empirical data that I received from ISP traffic pattern analysis indicates that about 93% of the file sharing protocols (in action) carry tagged PORN data. eBook tagged data traffic is almost not measurable in the grand scheme of things. Good luck on changing the world. Now it is a competition between your high-value books (that apparently are not going to be published, due to lack of profitability) and what people are actually consuming en mass 24/7/365. --Ron? ? N7FTZ On Thu, Aug 22, 2019 at 11:20 AM Jack Purdum via Groups.Io <jjpurdum=[email protected]> wrote:
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Re: QST September 2019 pg42 to 47
No, the vast majority (aka a "great part") of student debt is not due to the high cost of student textbooks..
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A $20-40,000/year university is not suddenly rendered 'unaffordable' by $500-800 in text books per semester. It's a non-sensical claim, but please, I'd be interested in your source for that claim. Ken, N2VIP On Aug 22, 2019, at 12:48 PM, Dr. Flywheel <Dr.Flywheel@...> wrote: |
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