Re: TSW Website information
Wow, that WORKED the first time!? Thanks to the wonderful support from my new host, the move was pretty much painless.? Login to the new site is still ? (do not use https yet as they are still working on the certificate).? That will come in about a week or so.? Right now, it should come up just as it did before and all info was transferred to the new site by FTP in about 3 minutes.? So far all testing shows it took just fine.
Jim, W0EB
TSW Manager/Project Coordinator
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I agree,a lot of alligator clips for the low current circuit voltage type are very flimsy and tend to twist.I happened across some better quality ones at a UK radio rally and bought loads and made my own up.All the fleabay ones I have seen are flimsy.
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Fellows builders.? This might seem trivial but bear with me.? I cannot find a source of GOOD alligator clips.? I have purchased new clips in bundles of 10 at ham shows, etc.? When pinched they tend to go side to side rather than vertically.? I search the
web but don't trust the photos and representations.?
Anyone?
Bill
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Fellows builders.? This might seem trivial but bear with me.? I cannot find a source of GOOD alligator clips.? I have purchased new clips in bundles of 10 at ham shows, etc.? When pinched they tend to go side to side rather than vertically.? I search the web but don't trust the photos and representations.?
Anyone?
Bill
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Hi folks,
The TSW Website () will be down for a few days while migrating the site to a new server.?
It was originally hosted for free by a friend of mine on his personal server, but he's moving things and that availability has gone away so I'm migrating over to a new host.? I do have to pay for this host, but it isn't very expensive and it will give me a bit more security as they provide https features at no extra charge.
I'm currently in the process of getting the domain established and getting secure FTP access to the site so I can upload everything and get it on the web.? The web address will remain the same and all the same files, etc will remain as they were on the other host so once I get it running it should be the same as it was before.
If anyone has any questions or needs to contact me regarding something they have already downloaded from the site or needs information on the current Teensy 4.1 Raduino clone kit, simply email me (w0eb (at) cox dot net) and I'll respond as quickly as I can.
Jim, W0EB
TSW Manager/Project Coordinator
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Hi Ramon,
Did you place an order for the boards ?
Best regards, Peter.
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Re: Error uploading V5 Firmware to Nano = ubitx_v5.1_code:231:5: error: 'checkCAT' was not declared in this scope.
#v5
#nano
#firmware
Thank you, thank you. That did the trick! Stephen
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Re: Error uploading V5 Firmware to Nano = ubitx_v5.1_code:231:5: error: 'checkCAT' was not declared in this scope.
#v5
#nano
#firmware
ALL the .ino files need to be moved into the folder you created.
On Tuesday, July 13, 2021, 1:59:30 PM EDT, Stephen KO4CVU <goinfishin1952@...> wrote:
After successfully uploading Reed's R1.5.1 firmware onto a uBITX v6 several times, I attempted to upload the Factory v5 firmware to a Nano (standalone) for later installation in a friend's v5 that is misbehaving. The compile failed with the error message "ubitx_v5.1_code:231:5: error: 'checkCAT' was not declared in this scope."? I downloaded the folder I am using from?? ?as a zip file. I unzipped the folder and placed the file "ubitx_v5.1_code.ino" in a new file folder named "ubitx_v5.1_code". I opened that folder and the file with the Arduino IDE and attempted to compile it but got the error message mentioned previously. Pardon my ignorance of Arduino procedures, but am I supposed to do anything with the other six ".ino" files in the original folder that I downloaded? I must be doing something wrong and would appreciate any suggestions. Thanks, Stephen P. S. I was able to successfully upload Reed's R1.5.1 firmware onto the standalone Nano to prove to myself that the Nano would accept an upload.?
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Error uploading V5 Firmware to Nano = ubitx_v5.1_code:231:5: error: 'checkCAT' was not declared in this scope.
#v5
#nano
#firmware
After successfully uploading Reed's R1.5.1 firmware onto a uBITX v6 several times, I attempted to upload the Factory v5 firmware to a Nano (standalone) for later installation in a friend's v5 that is misbehaving. The compile failed with the error message "ubitx_v5.1_code:231:5: error: 'checkCAT' was not declared in this scope."? I downloaded the folder I am using from?? ?as a zip file. I unzipped the folder and placed the file "ubitx_v5.1_code.ino" in a new file folder named "ubitx_v5.1_code". I opened that folder and the file with the Arduino IDE and attempted to compile it but got the error message mentioned previously. Pardon my ignorance of Arduino procedures, but am I supposed to do anything with the other six ".ino" files in the original folder that I downloaded? I must be doing something wrong and would appreciate any suggestions. Thanks, Stephen P. S. I was able to successfully upload Reed's R1.5.1 firmware onto the standalone Nano to prove to myself that the Nano would accept an upload.?
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Re: Signal bars on display?
Got a usb2 mini-B cable, installed the?CH340 driver and fired up uBITX Memory Manager. As I thought the s-meter had been set in memory by the previous owner (see attached) and I guess it's just responding to noise coming in through the A7 lead dangling in the breeze. I've now switched it off in Memory Manager as I'd prefer to get the analogue S-meter in the case working instead. I can always switch it back on again
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Robert,
Simple conductive shielding paint will do the trick. Easy to use and apply.
This is just one of many products available. I use it in many applications.
John
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I've got some info stored away of using a plasma based vacuum coating system (homebrew), and it might be a great way to coat the interior of cases with a transparent but conductive coating.? From what I've seen, the coating isn't 100% transparent, but you can easily see through it and it's still quite clear.? I'd think that would be something to consider for cases, if someone wanted to build such a system or had access to one.
There was also a discussion some time back about using a conductive plastic in 3-D printing that would make conductive cases for good shielding.
Another little point I've learned related to this topic - there is a copper-arsenic alloy is silver-like? in appearance, and has conductivity very close to silver itself.? The only problem with that alloy is that it is not very flexible, and is hard to work with (and it required precise and accurate control of the proportions of copper and arsenic to make it).? The ancient Mayans and some other groups used to make that alloy for decoration (they made all sorts of alloys, based on appearance and cultural ideas about metals at that time).? I've forgotten the actual proportions of each element, but it was like a few percent of arsenic, the rest copper.
If we could somehow manage to make wire with a coating like that but that was usable (flexible/bendable), it would be very useful!? Maybe some way to deposit a thin coating on a copper wire.? it would be cheaper than silver or silver plating, that's for sure!
Bob
N4FBZ
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On 7/12/21 5:59 AM, georges bery wrote: Gordon,
Gathering back memories from engineering school .
Skin effect is frequency related as well as power and conductance dependent .? At DC no skin effect is present . increasing the frequency will lead to a migration of the AC currents at the periphery of? the conductor .
With this phenomenon comes the need to improve conductance of the outer layer to be able to transport the energy needed for your purpose. One of the most obvious examples of this is the L-band cable used to connect the statellite reception antenna to the demodulator . The LNB (low Noise Block convertor) in front of the mirror is the actual antenna , polarity selection and first intermediate frequency downconvertor, it produces a low power radio signal in the 900Mhz to 2.7 Ghz range . Millions of instalations worldwide needed a cheap way of connecting this from the rooftop to the living room so a cable with a steel core is cheap as the center conductor can be used as pin for the (#*&!@) F connector . However steel is a poor conductor altough its mechanical qualities are welcome , So in comes copper cladding the core and skin effect . Good quality RF high power cable are therefore thick often silverclad as silver is the best conductor and hollow when you go to very high power at very high frequency.
Faraday cage is another kettle of fish. here you are talking of equipotential surfaces .When you surround something with a conductive layer there is no electron flow inside as there is no difference of potential between different points of the surface. It works both ways and is at its best when the conducting surface is solid . Often compromises are made to save material costs or to provide cooling and mesh is used instead of solid sheet or conductive paint loaded with metalic oxides or graphite to make acceptable Farady shields inside plastic cases.
73
Georges
HB9EFN
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Yes it locked up with "TX:14.225.00" etc displayed on the second line of the LCD except some of the characters were garbled with nonsense patterns. A capacitor across the PTT line and ground on the back of the mic connector fixed it.
I also have an additional relay connected to the PTT to key up my linear (as per N6QW see attached ) which I guess doesn't help, but the amplifier wasn't plugged in at the time so it only took 10 watts of RF coming in on the PTT line to screw it up.
M0WWS?
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Gahhh,
So according to that calculator, skin depth is inversely proportional to the square ROOT of the frequency.
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On Mon, Jul 12, 2021 at 08:23 AM, Jerry Gaffke wrote:
So according to that calculator, skin depth is inversely proportional to the square of the frequency.
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On Jul 11, 2021, at 12:04 PM, Arv Evans <arvid.evans@...> wrote:
? Don
Have you pressed the knob to get into the menu system?
Arv _._
¡°Using¡± V6.1. Between the menu issue and the limited space for an antenna, and dead bands, I have not been having a good time.
Thanks.
Don On Jul 10, 2021, at 4:53 PM, Evan Hand <elhandjr@...> wrote:
?Hi Don,
Which version of uBiTx do you have. and are there any modifications from stock?
Most versions with stock displays are as Curt has stated.? You change settings through the encoder (tuning knob) and pressing the knob in to select.
The v6 and those upgraded to KD8CEC software with touch screens do have menus through the touch screen.??
Either way, there is a menu setting used to set straight key or iambic a or b.
73
Evan
AC9TU
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A minor clarification:
At 60mhz, skin depth is 8.4um.
At 60hz, skin depth is 8.4mm.
So according to that calculator, skin depth is inversely proportional to the square of the frequency.
Exactly.
Jerry, KE7ER
On Mon, Jul 12, 2021 at 12:16 AM, Gordon Gibby wrote:
Skin effect is curious, here's a calculator.??
For copper, it shows that the skin effect at 10mhz is 20 micrometers, so at that depth the current density
is only 37% of what it is at the surface of the copper. It decreases exponentially as you go deeper.
What I find curious is that at 60 Hz, the skin depth is 8.4mm. That's 6 orders of magnitude lower
in frequency, but only 3 orders of magnitude larger skin depth
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A couple of times my unit locked up but most of the times, keying the mike multiple times released the transmit lockup. I haven't worked on ti yet but I intend to put a small cap and RF block of some kind just inside of the mike socket.
Earl Cox? KB5UEW? Reply or E-mail me at:? kb5uew@...
On Monday, July 12, 2021, 07:55:42 AM MDT, Stephen KO4CVU <goinfishin1952@...> wrote:
My uBITX v6 has recently locked up in the TX mode while I was using it with JS8Call running on my laptop. When yours locked up, was the TX indication visible on the LCD? Mine wasn¡¯t. I realized that the unit was locked up when I noticed that an external power meter was showing what is usually the full power output when I ¡°tune up¡± in the CW mode. I disconnected the lines to the microphone and speaker jacks but the unit was still locked up. I turned the power off and then back on and it was still locked up. I plugged in a microphone and hit the PTT button and that unlocked it! Thanks in advance for sharing. Stephen, KO4CVU
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It probably has to do with being able to lay it out and take it up which they do frequently. They don't worry about skin effect with Stranded wire at 60 Hz.?
Earl Cox? KB5UEW? Reply or E-mail me at:? kb5uew@...
On Monday, July 12, 2021, 02:45:11 AM MDT, Tom, wb6b <wb6b@...> wrote:
On Sun, Jul 11, 2021 at 10:46 PM, Jerry Gaffke wrote:
What I find curious is that at 60 Hz, the skin depth is 8.4mm
Interesting, that still allows fairly large cables. I read somewhere that the people that run power from those large generators used on remote movie locations and stage lighting setups run parallel wires for each power leg, rather than a larger single wire for each. I wonder if that (skin effect) is the reason. Or is it just that larger wire is not available for the high currents they are working with.? Tom, wb6b
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My uBITX v6 has recently locked up in the TX mode while I was using it with JS8Call running on my laptop. When yours locked up, was the TX indication visible on the LCD? Mine wasn¡¯t. I realized that the unit was locked up when I noticed that an external power meter was showing what is usually the full power output when I ¡°tune up¡± in the CW mode. I disconnected the lines to the microphone and speaker jacks but the unit was still locked up. I turned the power off and then back on and it was still locked up. I plugged in a microphone and hit the PTT button and that unlocked it! Thanks in advance for sharing. Stephen, KO4CVU
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Re: Interfere local Broadcasting radio station
I used to know what it means. This only refers to the medium wave 600 Kw tx and its 3 el vertical array.
They also had 3 X 250Kw Short Wave?Txs with 8 dipoles on both sides of curtain arrays steerable by phasing lines.
Broke into everything?through rectification, including?crane cables at the Free Port and if you touched a TV antenna cable lightly in Bir?ebbu?a, Marsaxlokk and Marsascala which were just across the bay you?would see sparks flying to your fingers and feel an rf burn.
They also had a log periodic?array and if I remember correctly the boom was 40 metres long used for communications with a 20 or 25 Kw tx and as an emergency tx/antenna combination.
Everything was powered?by a direct 33Kv line from the power station
Not really QRP
Something from long ago ¡ the first time I installed my shack at this QTH in about 1990, I put up a sky wave loop for 80M.? Surprise, the 50kW AM BCB station a couple of miles down the road ¡ª on 1300 kHz ¡ª wiped me out on ALL HF bands.? I calculated what their third harmonic was at my QTH and checked their legal limit.? They were legal.? ?
So I went with a vertical antenna instead, rather than put a high-pass BCB filter on the loop.? ?
30 years later, we have improved receiver technology and I have a whole lot more test gear.? ?I might try the loop again.? With a BCB notch filter on 1300 this time.
73
Jim N6OTQ
Sent from my quenched-gap spark transmitter.
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Gordon,
Gathering back memories from engineering school .
Skin effect is frequency related as well as power and conductance dependent .? At DC no skin effect is present . increasing the frequency will lead to a migration of the AC currents at the periphery of? the conductor .
With this phenomenon comes the need to improve conductance of the outer layer to be able to transport the energy needed for your purpose. One of the most obvious examples of this is the L-band cable used to connect the statellite reception antenna to the demodulator . The LNB (low Noise Block convertor) in front of the mirror is the actual antenna , polarity selection and first intermediate frequency downconvertor, it produces a low power radio signal in the 900Mhz to 2.7 Ghz range . Millions of instalations worldwide needed a cheap way of connecting this from the rooftop to the living room so a cable with a steel core is cheap as the center conductor can be used as pin for the? (#*&!@) F connector . However steel is a poor conductor altough its mechanical qualities are welcome , So in comes copper cladding the core and skin effect . Good quality RF high power cable are therefore thick often silverclad as silver is the best conductor and hollow when you go to very high power at very high frequency.
Faraday cage is another kettle of fish. here you are talking of equipotential surfaces .When you surround something with a conductive layer there is no electron flow inside as there is no difference of potential between different points of the surface. It works both ways and is at its best when the conducting surface is solid . Often compromises are made to save material costs or to provide cooling and mesh is used instead of solid sheet or conductive paint loaded with metalic oxides or graphite to make acceptable Farady shields inside plastic cases.? ??
73
Georges
HB9EFN
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Jim Sheldon
